Updated stdlib & tests with 0-terminated strings.

src/main/kc/stdlib/print.kc

@@ -8,13 +8,13 @@ byte* print_char_cursor = print_line_cursor;
 // Print a number of zero-terminated strings, each followed by a newline.
 // The sequence of lines is terminated by another zero.
 void print_str_lines(byte* str) {
-    while(*str!='@') {
+    while(*str) {
         do {
             byte ch = *(str++);
-            if(ch!='@') {
+            if(ch) {
                 *(print_char_cursor++) = ch;
             }
-        } while (ch!='@');
+        } while (ch);
         print_ln();
     }
 }
@@ -27,14 +27,14 @@ void print_str_ln(byte* str) {
 
 // Print a zero-terminated string
 void print_str(byte* str) {
-    while(*str!='@') {
+    while(*str) {
         *(print_char_cursor++) = *(str++);
     }
 }
 
 // Print a string at a specific screen position
 void print_str_at(byte* str, byte* at) {
-    while(*str!='@') {
+    while(*str) {
         *(at++) = *(str++);
     }
 }

src/test/kc/examples/chargen/chargen-analysis.kc

@@ -61,7 +61,7 @@ void main() {
 
 // Print a string at a specific screen position
 void print_str_at(byte* str, byte* at) {
-    while(*str!='@') {
+    while(*str) {
         *(at++) = *(str++);
     }
 }

src/test/kc/examples/scroll/scroll.kc

@@ -23,7 +23,7 @@ void main() {
             }
             // Render next char
             byte c = *nxt;
-            if(c=='@') {
+            if(c==0) {
                nxt = TEXT;
                c = *nxt;
             }

src/test/kc/examples/scrollbig/scrollbig.kc

@@ -61,7 +61,7 @@ byte* nxt = TEXT;
 // Find the next char of the scroll text
 byte next_char() {
   byte c = *nxt;
-  if(c=='@') {
+  if(c==0) {
     nxt = TEXT;
     c = *nxt;
   }

src/test/kc/function-pointer-noarg-call-10.kc

@@ -25,6 +25,6 @@ void print(byte* msg) {
     byte i=0;
     do {
         SCREEN[idx++] = msg[i++];
-    } while(msg[i]!='@');
+    } while(msg[i]);
 }
 

src/test/kc/function-pointer-noarg-call-7.kc

@@ -20,7 +20,7 @@ void hello() {
     byte i=0;
     do {
         SCREEN[idx++] = msg[i++];
-    } while(msg[i]!='@');
+    } while(msg[i]);
 }
 
 

src/test/kc/function-pointer-noarg-call-8.kc

@@ -25,7 +25,7 @@ void hello() {
     byte i=0;
     do {
         SCREEN[idx++] = msg[i++];
-    } while(msg[i]!='@');
+    } while(msg[i]);
 }
 
 

src/test/kc/helloworld2-inline.kc

@@ -7,7 +7,7 @@ void main() {
 
 inline void print2(byte* at, byte* msg) {
     byte j=0;
-    for(byte i=0; msg[i]!='@'; i++) {
+    for(byte i=0; msg[i]; i++) {
         at[j] = msg[i];
         j += 2;
     }

src/test/kc/helloworld2.kc

@@ -7,7 +7,7 @@ void main() {
 
 void print2(byte* at, byte* msg) {
     byte j=0;
-    for(byte i=0; msg[i]!='@'; i++) {
+    for(byte i=0; msg[i]; i++) {
         at[j] = msg[i];
         j += 2;
     }

src/test/kc/inline-function-print.kc

@@ -10,7 +10,7 @@ void main() {
 
 inline void print(byte* at, byte* msg) {
     byte j=0;
-    for(byte i=0; msg[i]!='@'; i++) {
+    for(byte i=0; msg[i]; i++) {
         at[j] = msg[i];
         j += 2;
     }

src/test/kc/inline-string-2.kc

@@ -17,7 +17,7 @@ void print_msg(byte idx) {
 
 byte* screen = $0400;
 void print(byte* msg) {
-    while(*msg!='@') {
+    while(*msg) {
         *(screen++) = *(msg++);
     }
 }

src/test/kc/inline-string.kc

@@ -10,7 +10,7 @@ void main() {
 
 byte* screen = $0400;
 void print(byte* msg) {
-    while(*msg!='@') {
+    while(*msg) {
         *(screen++) = *(msg++);
     }
 }

src/test/kc/local-string.kc

@@ -3,7 +3,7 @@ void main() {
     byte* screen = $0400;
     byte[] msg = "message 2 ";
     byte i=0;
-    while(msg[i]!='@') {
+    while(msg[i]) {
         screen[i++] = msg[i];
     }
 }

src/test/kc/loop-break-continue.kc

@@ -1,10 +1,10 @@
 // Illustrates both break & continue statements in a loop
-// Prints a message ending at '@' skipping all spaces
+// Prints a message ending at NUL skipping all spaces
 void main() {
     byte* screen = $400;
     byte[] str = "hello brave new world";
     for( byte i: 0..255) {
-    	if(str[i]=='@') break;
+    	if(str[i]==0) break;
     	if(str[i]==' ') continue;
     	*screen++ = str[i];
     }

src/test/kc/pointer-pointer-2.kc

@@ -7,7 +7,7 @@ void main() {
     byte* text;
     for(byte i: 0..20) {
         nexttext(&text);
-        while(*text!='@') {
+        while(*text) {
             *screen++ = *text++;
         }
     }

src/test/kc/scroll-clobber.kc

@@ -7,7 +7,7 @@ void main() {
     byte i=0;
     do {
         byte c = *nxt;
-        if(c=='@') {
+        if(c==0) {
            nxt = TEXT;
            c = *nxt;
         }

src/test/kc/scrollbig-clobber.kc

@@ -14,7 +14,7 @@ byte* nxt = TEXT;
 // Find the next char of the text
 byte next_char() {
     byte c = *nxt;
-    if(c=='@') {
+    if(c==0) {
         nxt = TEXT;
         c = *nxt;
     }

src/test/kc/string-const-consolidation-noroot.kc

@@ -11,7 +11,7 @@ void main() {
 }
 
 void print(byte* string) {
-    while(*string!='@') {
+    while(*string) {
         *screen++ = *string++;
     }
 }

src/test/kc/string-const-consolidation.kc

@@ -11,7 +11,7 @@ void main() {
 }
 
 void print(byte* string) {
-    while(*string!='@') {
+    while(*string) {
         *screen++ = *string++;
     }
 }

src/test/ref/bitmap-plot-3.log

@@ -6,6 +6,11 @@ Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::dig
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
 Warning! Adding boolean cast to non-boolean condition (number~) abs_u16::$1
 Warning! Adding boolean cast to non-boolean condition (number~) sgn_u16::$1
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (byte*) BITMAP
 Identified constant variable (byte*) SCREEN

src/test/ref/c-types.asm

@@ -177,7 +177,7 @@ print_str: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/c-types.cfg

@@ -152,7 +152,7 @@ print_str: scope:[print_str]  from testChar testInt testLong testShort
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [71] (byte*) print_char_cursor#136 ← phi( print_str/(byte*) print_char_cursor#156 print_str::@2/(byte*) print_char_cursor#1 )
   [71] (byte*) print_str::str#5 ← phi( print_str/(byte*) print_str::str#7 print_str::@2/(byte*) print_str::str#0 )
-  [72] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2
+  [72] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [73] return 

src/test/ref/c-types.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (byte) testChar::u
 Identified constant variable (byte) testChar::n
@@ -125,7 +130,7 @@ print_str: scope:[print_str]  from testChar testInt testLong testShort
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   (byte*) print_char_cursor#136 ← phi( print_str/(byte*) print_char_cursor#156 print_str::@2/(byte*) print_char_cursor#1 )
   (byte*) print_str::str#5 ← phi( print_str/(byte*) print_str::str#7 print_str::@2/(byte*) print_str::str#0 )
-  (bool~) print_str::$0 ← *((byte*) print_str::str#5) != (byte) '@'
+  (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#5)
   if((bool~) print_str::$0) goto print_str::@2
   to:print_str::@return
 print_str::@2: scope:[print_str]  from print_str::@1
@@ -1239,6 +1244,7 @@ SYMBOL TABLE SSA
 (word) testShort::u#0
 
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#5)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#20 + (number) $28
 Adding number conversion cast (snumber) 0 in (bool~) print_sword::$0 ← (signed word) print_sword::w#5 < (number) 0
 Adding number conversion cast (snumber) 0 in (bool~) print_sbyte::$0 ← (signed byte) print_sbyte::b#2 < (number) 0
@@ -1282,6 +1288,7 @@ Inlining cast (signed dword) testLong::s#0 ← (snumber)(number) -$222e0
 Successful SSA optimization Pass2InlineCast
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
@@ -1303,6 +1310,7 @@ Simplifying constant integer cast -$222e0
 Simplifying constant integer cast -$222e0
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized signed number type (signed byte) 0
 Finalized signed number type (signed byte) 0
@@ -1515,7 +1523,7 @@ Identical Phi Values (byte*) print_char_cursor#148 (byte*) print_char_cursor#26
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) memset::$1 [3] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [13] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str::$0 [26] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2
+Simple Condition (bool~) print_str::$0 [26] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2
 Simple Condition (bool~) print_ln::$1 [39] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#26) goto print_ln::@1
 Simple Condition (bool~) print_sword::$0 [48] if((signed word) print_sword::w#10<(signed byte) 0) goto print_sword::@1
 Simple Condition (bool~) print_sbyte::$0 [72] if((signed byte) print_sbyte::b#1<(signed byte) 0) goto print_sbyte::@1
@@ -2015,7 +2023,7 @@ print_str: scope:[print_str]  from testChar testInt testLong testShort
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [71] (byte*) print_char_cursor#136 ← phi( print_str/(byte*) print_char_cursor#156 print_str::@2/(byte*) print_char_cursor#1 )
   [71] (byte*) print_str::str#5 ← phi( print_str/(byte*) print_str::str#7 print_str::@2/(byte*) print_str::str#0 )
-  [72] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2
+  [72] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [73] return 
@@ -2757,10 +2765,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [72] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [72] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -3287,7 +3295,7 @@ Statement [59] (byte) print_byte::b#2 ← < (word) print_word::w#5 [ print_char_
 Statement [63] (byte~) print_byte::$0 ← (byte) print_byte::b#5 >> (byte) 4 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] ( main:2::testLong:13::print_dword:18::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_word:80::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_word:106::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_dword:18::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_word:80::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_word:106::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testChar:7::print_byte:121 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testChar:7::print_byte:125 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testChar:7::print_sbyte:129::print_byte:137 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:17 [ print_byte::b#5 print_byte::b#1 print_byte::b#2 ]
 Statement [66] (byte~) print_byte::$2 ← (byte) print_byte::b#5 & (byte) $f [ print_char_cursor#26 print_byte::$2 ] ( main:2::testLong:13::print_dword:18::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_word:80::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_word:106::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_dword:18::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_word:80::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_word:106::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testChar:7::print_byte:121 [ print_char_cursor#26 print_byte::$2 ] main:2::testChar:7::print_byte:125 [ print_char_cursor#26 print_byte::$2 ] main:2::testChar:7::print_sbyte:129::print_byte:137 [ print_char_cursor#26 print_byte::$2 ] ) always clobbers reg byte a 
-Statement [72] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2 [ print_char_cursor#136 print_str::str#5 ] ( main:2::testLong:13::print_str:16 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testInt:11::print_str:78 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testShort:9::print_str:104 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testChar:7::print_str:119 [ print_char_cursor#136 print_str::str#5 ] ) always clobbers reg byte a reg byte y 
+Statement [72] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2 [ print_char_cursor#136 print_str::str#5 ] ( main:2::testLong:13::print_str:16 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testInt:11::print_str:78 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testShort:9::print_str:104 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testChar:7::print_str:119 [ print_char_cursor#136 print_str::str#5 ] ) always clobbers reg byte a reg byte y 
 Statement [74] *((byte*) print_char_cursor#136) ← *((byte*) print_str::str#5) [ print_char_cursor#136 print_str::str#5 ] ( main:2::testLong:13::print_str:16 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testInt:11::print_str:78 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testShort:9::print_str:104 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testChar:7::print_str:119 [ print_char_cursor#136 print_str::str#5 ] ) always clobbers reg byte a reg byte y 
 Statement [77] (byte*~) print_char_cursor#161 ← (byte*) print_line_cursor#1 [ print_line_cursor#1 print_char_cursor#161 ] ( main:2::testInt:11 [ print_line_cursor#1 print_char_cursor#161 ] ) always clobbers reg byte a 
 Statement [93] if((signed word) print_sword::w#10<(signed byte) 0) goto print_sword::@1 [ print_char_cursor#26 print_sword::w#10 ] ( main:2::testInt:11::print_sword:84 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] main:2::testInt:11::print_sword:88 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] main:2::testShort:9::print_sword:110 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] main:2::testShort:9::print_sword:114 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] ) always clobbers reg byte a 
@@ -3309,7 +3317,7 @@ Statement [57] (byte) print_byte::b#1 ← > (word) print_word::w#5 [ print_word:
 Statement [59] (byte) print_byte::b#2 ← < (word) print_word::w#5 [ print_char_cursor#26 print_byte::b#2 ] ( main:2::testLong:13::print_dword:18::print_word:52 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::b#2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::b#2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::b#2 ] main:2::testLong:13::print_dword:18::print_word:54 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testInt:11::print_word:80 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testInt:11::print_sword:84::print_word:98 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testInt:11::print_sword:88::print_word:98 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testShort:9::print_sword:110::print_word:98 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testShort:9::print_sword:114::print_word:98 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] main:2::testShort:9::print_word:106 [ print_line_cursor#1 print_char_cursor#26 print_byte::b#2 ] ) always clobbers reg byte a 
 Statement [63] (byte~) print_byte::$0 ← (byte) print_byte::b#5 >> (byte) 4 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] ( main:2::testLong:13::print_dword:18::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_word:80::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_word:106::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_dword:18::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_word:80::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testShort:9::print_word:106::print_byte:60 [ print_line_cursor#1 print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testChar:7::print_byte:121 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testChar:7::print_byte:125 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] main:2::testChar:7::print_sbyte:129::print_byte:137 [ print_char_cursor#149 print_byte::b#5 print_byte::$0 ] ) always clobbers reg byte a 
 Statement [66] (byte~) print_byte::$2 ← (byte) print_byte::b#5 & (byte) $f [ print_char_cursor#26 print_byte::$2 ] ( main:2::testLong:13::print_dword:18::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:58 [ print_line_cursor#1 print_dword::dw#2 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_word:80::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_word:106::print_byte:58 [ print_line_cursor#1 print_word::w#5 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_dword:18::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:52::print_byte:60 [ print_line_cursor#1 print_dword::dw#2 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_dword:18::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:22::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testLong:13::print_sdword:26::print_dword:41::print_word:54::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_word:80::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:84::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testInt:11::print_sword:88::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:110::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_sword:114::print_word:98::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testShort:9::print_word:106::print_byte:60 [ print_line_cursor#1 print_char_cursor#26 print_byte::$2 ] main:2::testChar:7::print_byte:121 [ print_char_cursor#26 print_byte::$2 ] main:2::testChar:7::print_byte:125 [ print_char_cursor#26 print_byte::$2 ] main:2::testChar:7::print_sbyte:129::print_byte:137 [ print_char_cursor#26 print_byte::$2 ] ) always clobbers reg byte a 
-Statement [72] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2 [ print_char_cursor#136 print_str::str#5 ] ( main:2::testLong:13::print_str:16 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testInt:11::print_str:78 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testShort:9::print_str:104 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testChar:7::print_str:119 [ print_char_cursor#136 print_str::str#5 ] ) always clobbers reg byte a reg byte y 
+Statement [72] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2 [ print_char_cursor#136 print_str::str#5 ] ( main:2::testLong:13::print_str:16 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testInt:11::print_str:78 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testShort:9::print_str:104 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testChar:7::print_str:119 [ print_char_cursor#136 print_str::str#5 ] ) always clobbers reg byte a reg byte y 
 Statement [74] *((byte*) print_char_cursor#136) ← *((byte*) print_str::str#5) [ print_char_cursor#136 print_str::str#5 ] ( main:2::testLong:13::print_str:16 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testInt:11::print_str:78 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testShort:9::print_str:104 [ print_line_cursor#1 print_char_cursor#136 print_str::str#5 ] main:2::testChar:7::print_str:119 [ print_char_cursor#136 print_str::str#5 ] ) always clobbers reg byte a reg byte y 
 Statement [77] (byte*~) print_char_cursor#161 ← (byte*) print_line_cursor#1 [ print_line_cursor#1 print_char_cursor#161 ] ( main:2::testInt:11 [ print_line_cursor#1 print_char_cursor#161 ] ) always clobbers reg byte a 
 Statement [93] if((signed word) print_sword::w#10<(signed byte) 0) goto print_sword::@1 [ print_char_cursor#26 print_sword::w#10 ] ( main:2::testInt:11::print_sword:84 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] main:2::testInt:11::print_sword:88 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] main:2::testShort:9::print_sword:110 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] main:2::testShort:9::print_sword:114 [ print_line_cursor#1 print_char_cursor#26 print_sword::w#10 ] ) always clobbers reg byte a 
@@ -3808,10 +3816,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [72] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [72] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -5102,11 +5110,11 @@ print_str: {
     // [71] phi (byte*) print_str::str#5 = (byte*) print_str::str#7 [phi:print_str/print_str::@2->print_str::@1#1] -- register_copy 
     // print_str::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [72] if(*((byte*) print_str::str#5)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [72] if((byte) 0!=*((byte*) print_str::str#5)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str::@return
     // }

src/test/ref/c64dtv-gfxexplorer.asm

@@ -1123,7 +1123,7 @@ print_str_at: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:
@@ -1417,7 +1417,7 @@ print_str_lines: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:
@@ -1427,7 +1427,7 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    cmp #'@'
+    cmp #0
     beq b3
     ldy #0
     sta (print_char_cursor),y
@@ -1436,7 +1436,7 @@ print_str_lines: {
     inc print_char_cursor+1
   !:
   b3:
-    cmp #'@'
+    cmp #0
     bne b2
     jsr print_ln
     lda print_line_cursor

src/test/ref/c64dtv-gfxexplorer.cfg

@@ -613,7 +613,7 @@ print_str_at: scope:[print_str_at]  from render_preset_name::@2
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   [322] (byte*) print_str_at::at#2 ← phi( print_str_at/(const byte*) FORM_SCREEN#0+(byte)(number) $28*(number) 2+(byte) $a print_str_at::@2/(byte*) print_str_at::at#0 )
   [322] (byte*) print_str_at::str#2 ← phi( print_str_at/(byte*) print_str_at::str#1 print_str_at::@2/(byte*) print_str_at::str#0 )
-  [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2
+  [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@return: scope:[print_str_at]  from print_str_at::@1
   [324] return 
@@ -820,7 +820,7 @@ print_str_lines::@1: scope:[print_str_lines]  from print_str_lines print_str_lin
   [414] (byte*) print_line_cursor#2 ← phi( print_str_lines/(byte*) print_set_screen::screen#2 print_str_lines::@6/(byte*) print_line_cursor#22 )
   [414] (byte*) print_char_cursor#22 ← phi( print_str_lines/(byte*~) print_char_cursor#73 print_str_lines::@6/(byte*~) print_char_cursor#74 )
   [414] (byte*) print_str_lines::str#3 ← phi( print_str_lines/(byte*) print_str_lines::str#5 print_str_lines::@6/(byte*) print_str_lines::str#0 )
-  [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2
+  [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2
   to:print_str_lines::@return
 print_str_lines::@return: scope:[print_str_lines]  from print_str_lines::@1
   [416] return 
@@ -830,7 +830,7 @@ print_str_lines::@2: scope:[print_str_lines]  from print_str_lines::@1 print_str
   [417] (byte*) print_str_lines::str#4 ← phi( print_str_lines::@1/(byte*) print_str_lines::str#3 print_str_lines::@3/(byte*) print_str_lines::str#0 )
   [418] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#4)
   [419] (byte*) print_str_lines::str#0 ← ++ (byte*) print_str_lines::str#4
-  [420] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3
+  [420] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3
   to:print_str_lines::@4
 print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   [421] *((byte*) print_char_cursor#20) ← (byte) print_str_lines::ch#0
@@ -838,7 +838,7 @@ print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   to:print_str_lines::@3
 print_str_lines::@3: scope:[print_str_lines]  from print_str_lines::@2 print_str_lines::@4
   [423] (byte*) print_char_cursor#38 ← phi( print_str_lines::@2/(byte*) print_char_cursor#20 print_str_lines::@4/(byte*) print_char_cursor#1 )
-  [424] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2
+  [424] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2
   to:print_str_lines::@5
 print_str_lines::@5: scope:[print_str_lines]  from print_str_lines::@3
   [425] phi()

src/test/ref/c64dtv-gfxexplorer.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) dtvSetCpuBankSegment1::cpuBank
 Identified constant variable (byte*) DTV_BLITTER_ALU
 Identified constant variable (byte*) HEAP_TOP
@@ -422,8 +427,8 @@ print_str_lines::@1: scope:[print_str_lines]  from print_str_lines print_str_lin
   (byte*) print_line_cursor#37 ← phi( print_str_lines/(byte*) print_line_cursor#45 print_str_lines::@11/(byte*) print_line_cursor#1 )
   (byte*) print_char_cursor#39 ← phi( print_str_lines/(byte*) print_char_cursor#47 print_str_lines::@11/(byte*) print_char_cursor#2 )
   (byte*) print_str_lines::str#3 ← phi( print_str_lines/(byte*) print_str_lines::str#5 print_str_lines::@11/(byte*) print_str_lines::str#6 )
-  (bool~) print_str_lines::$0 ← *((byte*) print_str_lines::str#3) != (byte) '@'
+  (bool~) print_str_lines::$2 ← (number) 0 != *((byte*) print_str_lines::str#3)
-  if((bool~) print_str_lines::$0) goto print_str_lines::@4
+  if((bool~) print_str_lines::$2) goto print_str_lines::@4
   to:print_str_lines::@return
 print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@1 print_str_lines::@5
   (byte*) print_line_cursor#54 ← phi( print_str_lines::@1/(byte*) print_line_cursor#37 print_str_lines::@5/(byte*) print_line_cursor#46 )
@@ -431,16 +436,16 @@ print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@1 print_str
   (byte*) print_str_lines::str#4 ← phi( print_str_lines::@1/(byte*) print_str_lines::str#3 print_str_lines::@5/(byte*) print_str_lines::str#7 )
   (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#4)
   (byte*) print_str_lines::str#0 ← ++ (byte*) print_str_lines::str#4
-  (bool~) print_str_lines::$1 ← (byte) print_str_lines::ch#0 != (byte) '@'
+  (bool~) print_str_lines::$4 ← (number) 0 != (byte) print_str_lines::ch#0
-  (bool~) print_str_lines::$2 ← ! (bool~) print_str_lines::$1
+  (bool~) print_str_lines::$0 ← ! (bool~) print_str_lines::$4
-  if((bool~) print_str_lines::$2) goto print_str_lines::@5
+  if((bool~) print_str_lines::$0) goto print_str_lines::@5
   to:print_str_lines::@6
 print_str_lines::@5: scope:[print_str_lines]  from print_str_lines::@4 print_str_lines::@6
   (byte*) print_line_cursor#46 ← phi( print_str_lines::@4/(byte*) print_line_cursor#54 print_str_lines::@6/(byte*) print_line_cursor#55 )
   (byte*) print_char_cursor#48 ← phi( print_str_lines::@4/(byte*) print_char_cursor#37 print_str_lines::@6/(byte*) print_char_cursor#1 )
   (byte*) print_str_lines::str#7 ← phi( print_str_lines::@4/(byte*) print_str_lines::str#0 print_str_lines::@6/(byte*) print_str_lines::str#8 )
   (byte) print_str_lines::ch#1 ← phi( print_str_lines::@4/(byte) print_str_lines::ch#0 print_str_lines::@6/(byte) print_str_lines::ch#2 )
-  (bool~) print_str_lines::$3 ← (byte) print_str_lines::ch#1 != (byte) '@'
+  (bool~) print_str_lines::$3 ← (number) 0 != (byte) print_str_lines::ch#1
   if((bool~) print_str_lines::$3) goto print_str_lines::@4
   to:print_str_lines::@7
 print_str_lines::@6: scope:[print_str_lines]  from print_str_lines::@4
@@ -478,7 +483,7 @@ print_str_at: scope:[print_str_at]  from render_preset_name::@22
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   (byte*) print_str_at::at#3 ← phi( print_str_at/(byte*) print_str_at::at#4 print_str_at::@2/(byte*) print_str_at::at#0 )
   (byte*) print_str_at::str#2 ← phi( print_str_at/(byte*) print_str_at::str#4 print_str_at::@2/(byte*) print_str_at::str#0 )
-  (bool~) print_str_at::$0 ← *((byte*) print_str_at::str#2) != (byte) '@'
+  (bool~) print_str_at::$0 ← (number) 0 != *((byte*) print_str_at::str#2)
   if((bool~) print_str_at::$0) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@2: scope:[print_str_at]  from print_str_at::@1
@@ -6711,9 +6716,9 @@ SYMBOL TABLE SSA
 (byte*) print_str_at::str#4
 (void()) print_str_lines((byte*) print_str_lines::str)
 (bool~) print_str_lines::$0
-(bool~) print_str_lines::$1
 (bool~) print_str_lines::$2
 (bool~) print_str_lines::$3
+(bool~) print_str_lines::$4
 (label) print_str_lines::@1
 (label) print_str_lines::@11
 (label) print_str_lines::@4
@@ -6840,6 +6845,10 @@ Adding number conversion cast (unumber) $10 in (byte) DTV_COLORRAM_OFF#0 ← (nu
 Adding number conversion cast (unumber) $40 in (byte) DTV_CHUNKY#0 ← (number) $40
 Adding number conversion cast (unumber) $1d800 in (dword) DTV_COLOR_BANK_DEFAULT#0 ← (number) $1d800
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str_lines::$2 ← (number) 0 != *((byte*) print_str_lines::str#3)
+Adding number conversion cast (unumber) 0 in (bool~) print_str_lines::$4 ← (number) 0 != (byte) print_str_lines::ch#0
+Adding number conversion cast (unumber) 0 in (bool~) print_str_lines::$3 ← (number) 0 != (byte) print_str_lines::ch#1
+Adding number conversion cast (unumber) 0 in (bool~) print_str_at::$0 ← (number) 0 != *((byte*) print_str_at::str#2)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#21 + (number) $28
 Adding number conversion cast (unumber) $3e8 in (word) memset::num#0 ← (number) $3e8
 Adding number conversion cast (unumber) 2 in (byte) KEY_CRSR_RIGHT#0 ← (number) 2
@@ -7480,6 +7489,10 @@ Simplifying constant pointer cast (byte*) 53309
 Simplifying constant pointer cast (byte*) 255
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
+Simplifying constant integer cast 0
+Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast $3e8
 Simplifying constant integer cast 2
@@ -8369,6 +8382,10 @@ Finalized unsigned number type (byte) $10
 Finalized unsigned number type (byte) $40
 Finalized unsigned number type (dword) $1d800
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized unsigned number type (word) $3e8
 Finalized unsigned number type (byte) 2
@@ -8732,7 +8749,7 @@ Adding pointer type conversion cast (byte*) bitmap_clear::$0 in (byte*~) bitmap_
 Adding pointer type conversion cast (byte*) form_field_ptr::$0 in (byte*~) form_field_ptr::$0 ← (word~) form_field_ptr::$2
 Successful SSA optimization PassNAddTypeConversionAssignment
 Inversing boolean not [63] (bool~) memset::$1 ← (word) memset::num#1 <= (byte) 0 from [62] (bool~) memset::$0 ← (word) memset::num#1 > (byte) 0
-Inversing boolean not [92] (bool~) print_str_lines::$2 ← (byte) print_str_lines::ch#0 == (byte) '@' from [91] (bool~) print_str_lines::$1 ← (byte) print_str_lines::ch#0 != (byte) '@'
+Inversing boolean not [92] (bool~) print_str_lines::$0 ← (byte) 0 == (byte) print_str_lines::ch#0 from [91] (bool~) print_str_lines::$4 ← (byte) 0 != (byte) print_str_lines::ch#0
 Inversing boolean not [211] (bool~) keyboard_event_scan::$18 ← (byte~) keyboard_event_scan::$16 == (byte) 0 from [210] (bool~) keyboard_event_scan::$17 ← (byte~) keyboard_event_scan::$16 != (byte) 0
 Inversing boolean not [220] (bool~) keyboard_event_scan::$20 ← (byte) keyboard_events_size#18 == (byte) 8 from [219] (bool~) keyboard_event_scan::$19 ← (byte) keyboard_events_size#18 != (byte) 8
 Inversing boolean not [244] (bool~) keyboard_event_scan::$2 ← (byte~) keyboard_event_scan::$0 == (byte) 0 from [243] (bool~) keyboard_event_scan::$1 ← (byte~) keyboard_event_scan::$0 != (byte) 0
@@ -9414,10 +9431,10 @@ Identified duplicate assignment right side [1577] (dword~) form_mode::$15 ← (d
 Successful SSA optimization Pass2DuplicateRValueIdentification
 Simple Condition (bool~) memset::$1 [64] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [74] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str_lines::$0 [87] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@4
+Simple Condition (bool~) print_str_lines::$2 [87] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@4
-Simple Condition (bool~) print_str_lines::$2 [93] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@5
+Simple Condition (bool~) print_str_lines::$0 [93] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@5
-Simple Condition (bool~) print_str_lines::$3 [96] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@4
+Simple Condition (bool~) print_str_lines::$3 [96] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@4
-Simple Condition (bool~) print_str_at::$0 [112] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2
+Simple Condition (bool~) print_str_at::$0 [112] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2
 Simple Condition (bool~) print_ln::$1 [123] if((byte*) print_line_cursor#22<(byte*) print_char_cursor#38) goto print_ln::@1
 Simple Condition (bool~) keyboard_event_scan::$13 [197] if((byte) keyboard_event_scan::row_scan#0!=*((byte[8]) keyboard_scan_values#0 + (byte) keyboard_event_scan::row#2)) goto keyboard_event_scan::@9
 Simple Condition (bool~) keyboard_event_scan::$25 [206] if((byte) keyboard_event_scan::row#1!=rangelast(0,7)) goto keyboard_event_scan::@8
@@ -12444,7 +12461,7 @@ print_str_at: scope:[print_str_at]  from render_preset_name::@2
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   [322] (byte*) print_str_at::at#2 ← phi( print_str_at/(const byte*) FORM_SCREEN#0+(byte)(number) $28*(number) 2+(byte) $a print_str_at::@2/(byte*) print_str_at::at#0 )
   [322] (byte*) print_str_at::str#2 ← phi( print_str_at/(byte*) print_str_at::str#1 print_str_at::@2/(byte*) print_str_at::str#0 )
-  [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2
+  [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@return: scope:[print_str_at]  from print_str_at::@1
   [324] return 
@@ -12651,7 +12668,7 @@ print_str_lines::@1: scope:[print_str_lines]  from print_str_lines print_str_lin
   [414] (byte*) print_line_cursor#2 ← phi( print_str_lines/(byte*) print_set_screen::screen#2 print_str_lines::@6/(byte*) print_line_cursor#22 )
   [414] (byte*) print_char_cursor#22 ← phi( print_str_lines/(byte*~) print_char_cursor#73 print_str_lines::@6/(byte*~) print_char_cursor#74 )
   [414] (byte*) print_str_lines::str#3 ← phi( print_str_lines/(byte*) print_str_lines::str#5 print_str_lines::@6/(byte*) print_str_lines::str#0 )
-  [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2
+  [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2
   to:print_str_lines::@return
 print_str_lines::@return: scope:[print_str_lines]  from print_str_lines::@1
   [416] return 
@@ -12661,7 +12678,7 @@ print_str_lines::@2: scope:[print_str_lines]  from print_str_lines::@1 print_str
   [417] (byte*) print_str_lines::str#4 ← phi( print_str_lines::@1/(byte*) print_str_lines::str#3 print_str_lines::@3/(byte*) print_str_lines::str#0 )
   [418] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#4)
   [419] (byte*) print_str_lines::str#0 ← ++ (byte*) print_str_lines::str#4
-  [420] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3
+  [420] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3
   to:print_str_lines::@4
 print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   [421] *((byte*) print_char_cursor#20) ← (byte) print_str_lines::ch#0
@@ -12669,7 +12686,7 @@ print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   to:print_str_lines::@3
 print_str_lines::@3: scope:[print_str_lines]  from print_str_lines::@2 print_str_lines::@4
   [423] (byte*) print_char_cursor#38 ← phi( print_str_lines::@2/(byte*) print_char_cursor#20 print_str_lines::@4/(byte*) print_char_cursor#1 )
-  [424] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2
+  [424] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2
   to:print_str_lines::@5
 print_str_lines::@5: scope:[print_str_lines]  from print_str_lines::@3
   [425] phi()
@@ -17592,10 +17609,10 @@ print_str_at: {
     jmp b1
     // print_str_at::@1
   b1:
-    // [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str_at::@return
@@ -18278,10 +18295,10 @@ print_str_lines: {
     jmp b1
     // print_str_lines::@1
   b1:
-    // [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2_from_b1
     jmp breturn
     // print_str_lines::@return
@@ -18305,8 +18322,8 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    // [420] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3 -- vbuz1_eq_vbuc1_then_la1 
+    // [420] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3 -- vbuc1_eq_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     cmp ch
     beq b3_from_b2
     jmp b4
@@ -18328,8 +18345,8 @@ print_str_lines: {
     jmp b3
     // print_str_lines::@3
   b3:
-    // [424] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2 -- vbuz1_neq_vbuc1_then_la1 
+    // [424] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2 -- vbuc1_neq_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     cmp ch
     bne b2_from_b3
     // [425] phi from print_str_lines::@3 to print_str_lines::@5 [phi:print_str_lines::@3->print_str_lines::@5]
@@ -21192,7 +21209,7 @@ Statement [286] *((const byte*) BGCOL#0) ← (byte) 0 [ form_cursor_count#1 keyb
 Statement [287] *((const byte*) BORDERCOL#0) ← (byte) 0 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 ] ( main:2::form_mode:13 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 ] ) always clobbers reg byte a 
 Statement [290] if(*((const byte*) RASTER#0)!=(byte) $ff) goto form_mode::@4 [ keyboard_events_size#47 form_cursor_count#21 form_field_idx#28 form_mode::preset_current#6 ] ( main:2::form_mode:13 [ keyboard_events_size#47 form_cursor_count#21 form_field_idx#28 form_mode::preset_current#6 ] ) always clobbers reg byte a 
 Statement [318] (byte*) print_str_at::str#1 ← (byte*) render_preset_name::name#13 [ print_str_at::str#1 ] ( main:2::form_mode:13::render_preset_name:269 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#1 ] main:2::form_mode:13::render_preset_name:303 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#1 ] ) always clobbers reg byte a 
-Statement [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
+Statement [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2 [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:33 [ form_mode::preset_current#6 form_mode::preset_current#0 form_mode::preset_current#1 ]
 Statement [325] *((byte*) print_str_at::at#2) ← *((byte*) print_str_at::str#2) [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
 Statement [332] *((byte*)(word) form_field_ptr::line#0 + (byte) form_field_ptr::x#0) ← *((const byte[]) print_hextab#0 + *((const byte[]) form_fields_val#0 + (byte) form_render_values::idx#5)) [ form_render_values::idx#5 ] ( main:2::form_mode:13::form_render_values:267 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 form_render_values::idx#5 ] main:2::form_mode:13::form_render_values:301 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 form_render_values::idx#5 ] ) always clobbers reg byte a 
@@ -21217,7 +21234,7 @@ Statement [401] *((byte*)(word) form_field_ptr::line#0 + (byte) form_field_ptr::
 Statement [408] (byte*) form_set_screen::line#1 ← (byte*) form_set_screen::line#2 + (byte) $28 [ form_set_screen::y#2 form_set_screen::line#1 ] ( main:2::form_mode:13::form_set_screen:265 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 form_set_screen::y#2 form_set_screen::line#1 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:49 [ form_set_screen::y#2 form_set_screen::y#1 ]
 Statement [413] (byte*~) print_char_cursor#73 ← (byte*) print_set_screen::screen#2 [ print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] ) always clobbers reg byte a 
-Statement [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2 [ print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ) always clobbers reg byte a reg byte y 
+Statement [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2 [ print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ) always clobbers reg byte a reg byte y 
 Statement [418] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#4) [ print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] ) always clobbers reg byte a reg byte y 
 Statement [421] *((byte*) print_char_cursor#20) ← (byte) print_str_lines::ch#0 [ print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] ) always clobbers reg byte y 
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:275 [ print_str_lines::ch#0 ]
@@ -21529,7 +21546,7 @@ Statement [286] *((const byte*) BGCOL#0) ← (byte) 0 [ form_cursor_count#1 keyb
 Statement [287] *((const byte*) BORDERCOL#0) ← (byte) 0 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 ] ( main:2::form_mode:13 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 ] ) always clobbers reg byte a 
 Statement [290] if(*((const byte*) RASTER#0)!=(byte) $ff) goto form_mode::@4 [ keyboard_events_size#47 form_cursor_count#21 form_field_idx#28 form_mode::preset_current#6 ] ( main:2::form_mode:13 [ keyboard_events_size#47 form_cursor_count#21 form_field_idx#28 form_mode::preset_current#6 ] ) always clobbers reg byte a 
 Statement [318] (byte*) print_str_at::str#1 ← (byte*) render_preset_name::name#13 [ print_str_at::str#1 ] ( main:2::form_mode:13::render_preset_name:269 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#1 ] main:2::form_mode:13::render_preset_name:303 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#1 ] ) always clobbers reg byte a 
-Statement [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
+Statement [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2 [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
 Statement [325] *((byte*) print_str_at::at#2) ← *((byte*) print_str_at::str#2) [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
 Statement [332] *((byte*)(word) form_field_ptr::line#0 + (byte) form_field_ptr::x#0) ← *((const byte[]) print_hextab#0 + *((const byte[]) form_fields_val#0 + (byte) form_render_values::idx#5)) [ form_render_values::idx#5 ] ( main:2::form_mode:13::form_render_values:267 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 form_render_values::idx#5 ] main:2::form_mode:13::form_render_values:301 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 form_render_values::idx#5 ] ) always clobbers reg byte a reg byte y 
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:41 [ form_render_values::idx#5 form_render_values::idx#1 ]
@@ -21552,7 +21569,7 @@ Statement [400] (byte~) form_control::$14 ← *((byte*)(word) form_field_ptr::li
 Statement [401] *((byte*)(word) form_field_ptr::line#0 + (byte) form_field_ptr::x#0) ← (byte~) form_control::$14 [ keyboard_events_size#47 form_field_idx#28 form_field_ptr::line#0 form_field_ptr::x#0 form_cursor_count#15 ] ( main:2::form_mode:13::form_control:292 [ form_mode::preset_current#6 keyboard_events_size#47 form_field_idx#28 form_field_ptr::line#0 form_field_ptr::x#0 form_cursor_count#15 ] ) always clobbers reg byte y 
 Statement [408] (byte*) form_set_screen::line#1 ← (byte*) form_set_screen::line#2 + (byte) $28 [ form_set_screen::y#2 form_set_screen::line#1 ] ( main:2::form_mode:13::form_set_screen:265 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 form_set_screen::y#2 form_set_screen::line#1 ] ) always clobbers reg byte a 
 Statement [413] (byte*~) print_char_cursor#73 ← (byte*) print_set_screen::screen#2 [ print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] ) always clobbers reg byte a 
-Statement [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2 [ print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ) always clobbers reg byte a reg byte y 
+Statement [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2 [ print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ) always clobbers reg byte a reg byte y 
 Statement [418] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#4) [ print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] ) always clobbers reg byte a reg byte y 
 Statement [421] *((byte*) print_char_cursor#20) ← (byte) print_str_lines::ch#0 [ print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] ) always clobbers reg byte y 
 Statement [427] (byte*~) print_char_cursor#74 ← (byte*) print_line_cursor#22 [ print_str_lines::str#0 print_char_cursor#74 print_line_cursor#22 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#0 print_char_cursor#74 print_line_cursor#22 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#0 print_char_cursor#74 print_line_cursor#22 ] ) always clobbers reg byte a 
@@ -21745,7 +21762,7 @@ Statement [286] *((const byte*) BGCOL#0) ← (byte) 0 [ form_cursor_count#1 keyb
 Statement [287] *((const byte*) BORDERCOL#0) ← (byte) 0 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 ] ( main:2::form_mode:13 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 ] ) always clobbers reg byte a 
 Statement [290] if(*((const byte*) RASTER#0)!=(byte) $ff) goto form_mode::@4 [ keyboard_events_size#47 form_cursor_count#21 form_field_idx#28 form_mode::preset_current#6 ] ( main:2::form_mode:13 [ keyboard_events_size#47 form_cursor_count#21 form_field_idx#28 form_mode::preset_current#6 ] ) always clobbers reg byte a 
 Statement [318] (byte*) print_str_at::str#1 ← (byte*) render_preset_name::name#13 [ print_str_at::str#1 ] ( main:2::form_mode:13::render_preset_name:269 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#1 ] main:2::form_mode:13::render_preset_name:303 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#1 ] ) always clobbers reg byte a 
-Statement [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
+Statement [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2 [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
 Statement [325] *((byte*) print_str_at::at#2) ← *((byte*) print_str_at::str#2) [ print_str_at::str#2 print_str_at::at#2 ] ( main:2::form_mode:13::render_preset_name:269::print_str_at:319 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_at::str#2 print_str_at::at#2 ] main:2::form_mode:13::render_preset_name:303::print_str_at:319 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 print_str_at::str#2 print_str_at::at#2 ] ) always clobbers reg byte a reg byte y 
 Statement [332] *((byte*)(word) form_field_ptr::line#0 + (byte) form_field_ptr::x#0) ← *((const byte[]) print_hextab#0 + *((const byte[]) form_fields_val#0 + (byte) form_render_values::idx#5)) [ form_render_values::idx#5 ] ( main:2::form_mode:13::form_render_values:267 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 form_render_values::idx#5 ] main:2::form_mode:13::form_render_values:301 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 form_render_values::idx#5 ] ) always clobbers reg byte a reg byte y 
 Statement [338] (word) form_field_ptr::line#0 ← *((const byte[$19]) form_line_hi#0 + (byte) form_field_ptr::y#0) w= *((const byte[$19]) form_line_lo#0 + (byte) form_field_ptr::y#0) [ form_field_ptr::line#0 form_field_ptr::field_idx#2 ] ( main:2::form_mode:13::form_render_values:267::form_field_ptr:331 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 form_render_values::idx#5 form_field_ptr::line#0 form_field_ptr::field_idx#2 ] main:2::form_mode:13::form_render_values:301::form_field_ptr:331 [ form_cursor_count#16 keyboard_events_size#24 form_field_idx#18 form_mode::preset_current#1 form_render_values::idx#5 form_field_ptr::line#0 form_field_ptr::field_idx#2 ] main:2::form_mode:13::form_control:292::form_field_ptr:360 [ form_mode::preset_current#6 keyboard_events_size#47 form_cursor_count#21 form_field_idx#28 form_field_ptr::line#0 form_field_ptr::field_idx#2 ] ) always clobbers reg byte a 
@@ -21766,7 +21783,7 @@ Statement [400] (byte~) form_control::$14 ← *((byte*)(word) form_field_ptr::li
 Statement [401] *((byte*)(word) form_field_ptr::line#0 + (byte) form_field_ptr::x#0) ← (byte~) form_control::$14 [ keyboard_events_size#47 form_field_idx#28 form_field_ptr::line#0 form_field_ptr::x#0 form_cursor_count#15 ] ( main:2::form_mode:13::form_control:292 [ form_mode::preset_current#6 keyboard_events_size#47 form_field_idx#28 form_field_ptr::line#0 form_field_ptr::x#0 form_cursor_count#15 ] ) always clobbers reg byte y 
 Statement [408] (byte*) form_set_screen::line#1 ← (byte*) form_set_screen::line#2 + (byte) $28 [ form_set_screen::y#2 form_set_screen::line#1 ] ( main:2::form_mode:13::form_set_screen:265 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 form_set_screen::y#2 form_set_screen::line#1 ] ) always clobbers reg byte a 
 Statement [413] (byte*~) print_char_cursor#73 ← (byte*) print_set_screen::screen#2 [ print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#5 print_char_cursor#73 print_set_screen::screen#2 ] ) always clobbers reg byte a 
-Statement [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2 [ print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ) always clobbers reg byte a reg byte y 
+Statement [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2 [ print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#3 print_char_cursor#22 print_line_cursor#2 ] ) always clobbers reg byte a reg byte y 
 Statement [418] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#4) [ print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#4 print_char_cursor#20 print_str_lines::ch#0 ] ) always clobbers reg byte a reg byte y 
 Statement [421] *((byte*) print_char_cursor#20) ← (byte) print_str_lines::ch#0 [ print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_line_cursor#2 print_str_lines::str#0 print_char_cursor#20 print_str_lines::ch#0 ] ) always clobbers reg byte y 
 Statement [427] (byte*~) print_char_cursor#74 ← (byte*) print_line_cursor#22 [ print_str_lines::str#0 print_char_cursor#74 print_line_cursor#22 ] ( main:2::form_mode:13::print_str_lines:257 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#0 print_char_cursor#74 print_line_cursor#22 ] main:2::form_mode:13::print_str_lines:263 [ form_cursor_count#1 keyboard_events_size#27 form_field_idx#1 print_str_lines::str#0 print_char_cursor#74 print_line_cursor#22 ] ) always clobbers reg byte a 
@@ -24718,10 +24735,10 @@ print_str_at: {
     jmp b1
     // print_str_at::@1
   b1:
-    // [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str_at::@return
@@ -25336,10 +25353,10 @@ print_str_lines: {
     jmp b1
     // print_str_lines::@1
   b1:
-    // [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2_from_b1
     jmp breturn
     // print_str_lines::@return
@@ -25362,8 +25379,8 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    // [420] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3 -- vbuaa_eq_vbuc1_then_la1 
+    // [420] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3 -- vbuc1_eq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     beq b3_from_b2
     jmp b4
     // print_str_lines::@4
@@ -25383,8 +25400,8 @@ print_str_lines: {
     jmp b3
     // print_str_lines::@3
   b3:
-    // [424] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2 -- vbuaa_neq_vbuc1_then_la1 
+    // [424] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2 -- vbuc1_neq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     bne b2_from_b3
     // [425] phi from print_str_lines::@3 to print_str_lines::@5 [phi:print_str_lines::@3->print_str_lines::@5]
   b5_from_b3:
@@ -32469,11 +32486,11 @@ print_str_at: {
     // [322] phi (byte*) print_str_at::str#2 = (byte*) print_str_at::str#1 [phi:print_str_at->print_str_at::@1#1] -- register_copy 
     // print_str_at::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [323] if(*((byte*) print_str_at::str#2)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [323] if((byte) 0!=*((byte*) print_str_at::str#2)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str_at::@return
     // }
@@ -33029,11 +33046,11 @@ print_str_lines: {
     // [414] phi (byte*) print_str_lines::str#3 = (byte*) print_str_lines::str#5 [phi:print_str_lines/print_str_lines::@6->print_str_lines::@1#2] -- register_copy 
     // print_str_lines::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [415] if(*((byte*) print_str_lines::str#3)!=(byte) '@') goto print_str_lines::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [415] if((byte) 0!=*((byte*) print_str_lines::str#3)) goto print_str_lines::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str_lines::@return
     // }
@@ -33053,9 +33070,9 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    // if(ch!='@')
+    // if(ch)
-    // [420] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3 -- vbuaa_eq_vbuc1_then_la1 
+    // [420] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3 -- vbuc1_eq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     beq b3
     // print_str_lines::@4
     // *(print_char_cursor++) = ch
@@ -33072,9 +33089,9 @@ print_str_lines: {
     // [423] phi (byte*) print_char_cursor#38 = (byte*) print_char_cursor#20 [phi:print_str_lines::@2/print_str_lines::@4->print_str_lines::@3#0] -- register_copy 
     // print_str_lines::@3
   b3:
-    // while (ch!='@')
+    // while (ch)
-    // [424] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2 -- vbuaa_neq_vbuc1_then_la1 
+    // [424] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2 -- vbuc1_neq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     bne b2
     // [425] phi from print_str_lines::@3 to print_str_lines::@5 [phi:print_str_lines::@3->print_str_lines::@5]
     // print_str_lines::@5

src/test/ref/c64dtv-gfxmodes.asm

@@ -2242,7 +2242,7 @@ print_str_lines: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:
@@ -2252,7 +2252,7 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    cmp #'@'
+    cmp #0
     beq b3
     ldy #0
     sta (print_char_cursor),y
@@ -2261,7 +2261,7 @@ print_str_lines: {
     inc print_char_cursor+1
   !:
   b3:
-    cmp #'@'
+    cmp #0
     bne b2
     jsr print_ln
     lda print_line_cursor

src/test/ref/c64dtv-gfxmodes.cfg

@@ -1507,7 +1507,7 @@ print_str_lines::@1: scope:[print_str_lines]  from print_str_lines print_str_lin
   [865] (byte*) print_line_cursor#17 ← phi( print_str_lines/(const byte*) menu::SCREEN#0 print_str_lines::@6/(byte*) print_line_cursor#19 )
   [865] (byte*) print_char_cursor#19 ← phi( print_str_lines/(const byte*) menu::SCREEN#0 print_str_lines::@6/(byte*~) print_char_cursor#100 )
   [865] (byte*) print_str_lines::str#2 ← phi( print_str_lines/(const byte[]) MENU_TEXT#0 print_str_lines::@6/(byte*) print_str_lines::str#0 )
-  [866] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@2
+  [866] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@2
   to:print_str_lines::@return
 print_str_lines::@return: scope:[print_str_lines]  from print_str_lines::@1
   [867] return 
@@ -1517,7 +1517,7 @@ print_str_lines::@2: scope:[print_str_lines]  from print_str_lines::@1 print_str
   [868] (byte*) print_str_lines::str#3 ← phi( print_str_lines::@1/(byte*) print_str_lines::str#2 print_str_lines::@3/(byte*) print_str_lines::str#0 )
   [869] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#3)
   [870] (byte*) print_str_lines::str#0 ← ++ (byte*) print_str_lines::str#3
-  [871] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3
+  [871] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3
   to:print_str_lines::@4
 print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   [872] *((byte*) print_char_cursor#17) ← (byte) print_str_lines::ch#0
@@ -1525,7 +1525,7 @@ print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   to:print_str_lines::@3
 print_str_lines::@3: scope:[print_str_lines]  from print_str_lines::@2 print_str_lines::@4
   [874] (byte*) print_char_cursor#32 ← phi( print_str_lines::@2/(byte*) print_char_cursor#17 print_str_lines::@4/(byte*) print_char_cursor#1 )
-  [875] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2
+  [875] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2
   to:print_str_lines::@5
 print_str_lines::@5: scope:[print_str_lines]  from print_str_lines::@3
   [876] phi()

src/test/ref/c64dtv-gfxmodes.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) dtvSetCpuBankSegment1::cpuBank
 Identified constant variable (byte*) DTV_BLITTER_ALU
 Identified constant variable (byte*) HEAP_TOP
@@ -274,8 +279,8 @@ print_str_lines::@1: scope:[print_str_lines]  from print_str_lines print_str_lin
   (byte*) print_line_cursor#31 ← phi( print_str_lines/(byte*) print_line_cursor#50 print_str_lines::@11/(byte*) print_line_cursor#1 )
   (byte*) print_char_cursor#33 ← phi( print_str_lines/(byte*) print_char_cursor#52 print_str_lines::@11/(byte*) print_char_cursor#2 )
   (byte*) print_str_lines::str#2 ← phi( print_str_lines/(byte*) print_str_lines::str#4 print_str_lines::@11/(byte*) print_str_lines::str#5 )
-  (bool~) print_str_lines::$0 ← *((byte*) print_str_lines::str#2) != (byte) '@'
+  (bool~) print_str_lines::$2 ← (number) 0 != *((byte*) print_str_lines::str#2)
-  if((bool~) print_str_lines::$0) goto print_str_lines::@4
+  if((bool~) print_str_lines::$2) goto print_str_lines::@4
   to:print_str_lines::@return
 print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@1 print_str_lines::@5
   (byte*) print_line_cursor#68 ← phi( print_str_lines::@1/(byte*) print_line_cursor#31 print_str_lines::@5/(byte*) print_line_cursor#51 )
@@ -283,16 +288,16 @@ print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@1 print_str
   (byte*) print_str_lines::str#3 ← phi( print_str_lines::@1/(byte*) print_str_lines::str#2 print_str_lines::@5/(byte*) print_str_lines::str#6 )
   (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#3)
   (byte*) print_str_lines::str#0 ← ++ (byte*) print_str_lines::str#3
-  (bool~) print_str_lines::$1 ← (byte) print_str_lines::ch#0 != (byte) '@'
+  (bool~) print_str_lines::$4 ← (number) 0 != (byte) print_str_lines::ch#0
-  (bool~) print_str_lines::$2 ← ! (bool~) print_str_lines::$1
+  (bool~) print_str_lines::$0 ← ! (bool~) print_str_lines::$4
-  if((bool~) print_str_lines::$2) goto print_str_lines::@5
+  if((bool~) print_str_lines::$0) goto print_str_lines::@5
   to:print_str_lines::@6
 print_str_lines::@5: scope:[print_str_lines]  from print_str_lines::@4 print_str_lines::@6
   (byte*) print_line_cursor#51 ← phi( print_str_lines::@4/(byte*) print_line_cursor#68 print_str_lines::@6/(byte*) print_line_cursor#69 )
   (byte*) print_char_cursor#53 ← phi( print_str_lines::@4/(byte*) print_char_cursor#31 print_str_lines::@6/(byte*) print_char_cursor#1 )
   (byte*) print_str_lines::str#6 ← phi( print_str_lines::@4/(byte*) print_str_lines::str#0 print_str_lines::@6/(byte*) print_str_lines::str#7 )
   (byte) print_str_lines::ch#1 ← phi( print_str_lines::@4/(byte) print_str_lines::ch#0 print_str_lines::@6/(byte) print_str_lines::ch#2 )
-  (bool~) print_str_lines::$3 ← (byte) print_str_lines::ch#1 != (byte) '@'
+  (bool~) print_str_lines::$3 ← (number) 0 != (byte) print_str_lines::ch#1
   if((bool~) print_str_lines::$3) goto print_str_lines::@4
   to:print_str_lines::@7
 print_str_lines::@6: scope:[print_str_lines]  from print_str_lines::@4
@@ -6074,9 +6079,9 @@ SYMBOL TABLE SSA
 (byte*) print_set_screen::screen#1
 (void()) print_str_lines((byte*) print_str_lines::str)
 (bool~) print_str_lines::$0
-(bool~) print_str_lines::$1
 (bool~) print_str_lines::$2
 (bool~) print_str_lines::$3
+(bool~) print_str_lines::$4
 (label) print_str_lines::@1
 (label) print_str_lines::@11
 (label) print_str_lines::@4
@@ -6125,6 +6130,9 @@ Adding number conversion cast (unumber) $10 in (byte) DTV_COLORRAM_OFF#0 ← (nu
 Adding number conversion cast (unumber) $40 in (byte) DTV_CHUNKY#0 ← (number) $40
 Adding number conversion cast (unumber) $1d800 in (dword) DTV_COLOR_BANK_DEFAULT#0 ← (number) $1d800
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str_lines::$2 ← (number) 0 != *((byte*) print_str_lines::str#2)
+Adding number conversion cast (unumber) 0 in (bool~) print_str_lines::$4 ← (number) 0 != (byte) print_str_lines::ch#0
+Adding number conversion cast (unumber) 0 in (bool~) print_str_lines::$3 ← (number) 0 != (byte) print_str_lines::ch#1
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#18 + (number) $28
 Adding number conversion cast (unumber) $3e8 in (word) memset::num#0 ← (number) $3e8
 Adding number conversion cast (unumber) 8 in (byte) KEY_3#0 ← (number) 8
@@ -6935,6 +6943,9 @@ Simplifying constant pointer cast (byte*) 53309
 Simplifying constant pointer cast (byte*) 255
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
+Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast $3e8
 Simplifying constant integer cast 8
@@ -7336,6 +7347,9 @@ Finalized unsigned number type (byte) $10
 Finalized unsigned number type (byte) $40
 Finalized unsigned number type (dword) $1d800
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized unsigned number type (word) $3e8
 Finalized unsigned number type (byte) 8
@@ -7779,7 +7793,7 @@ Inferred type updated to dword in (unumber~) mode_8bppchunkybmm::$16 ← (dword)
 Adding pointer type conversion cast (byte*) bitmap_clear::$0 in (byte*~) bitmap_clear::$0 ← (word~) bitmap_clear::$3
 Successful SSA optimization PassNAddTypeConversionAssignment
 Inversing boolean not [64] (bool~) memset::$1 ← (word) memset::num#1 <= (byte) 0 from [63] (bool~) memset::$0 ← (word) memset::num#1 > (byte) 0
-Inversing boolean not [93] (bool~) print_str_lines::$2 ← (byte) print_str_lines::ch#0 == (byte) '@' from [92] (bool~) print_str_lines::$1 ← (byte) print_str_lines::ch#0 != (byte) '@'
+Inversing boolean not [93] (bool~) print_str_lines::$0 ← (byte) 0 == (byte) print_str_lines::ch#0 from [92] (bool~) print_str_lines::$4 ← (byte) 0 != (byte) print_str_lines::ch#0
 Inversing boolean not [206] (bool~) bitmap_init::$4 ← (byte) bitmap_init::bits#1 != (byte) 0 from [205] (bool~) bitmap_init::$3 ← (byte) bitmap_init::bits#1 == (byte) 0
 Inversing boolean not [225] (bool~) bitmap_init::$12 ← (byte~) bitmap_init::$10 != (byte) 7 from [224] (bool~) bitmap_init::$11 ← (byte~) bitmap_init::$10 == (byte) 7
 Inversing boolean not [366] (bool~) bitmap_line_xdyi::$4 ← (byte) bitmap_line_xdyi::xd#2 >= (byte) bitmap_line_xdyi::e#1 from [365] (bool~) bitmap_line_xdyi::$3 ← (byte) bitmap_line_xdyi::xd#2 < (byte) bitmap_line_xdyi::e#1
@@ -8377,9 +8391,9 @@ Identified duplicate assignment right side [1792] (word~) mode_8bppchunkybmm::$1
 Successful SSA optimization Pass2DuplicateRValueIdentification
 Simple Condition (bool~) memset::$1 [65] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [75] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str_lines::$0 [88] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@4
+Simple Condition (bool~) print_str_lines::$2 [88] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@4
-Simple Condition (bool~) print_str_lines::$2 [94] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@5
+Simple Condition (bool~) print_str_lines::$0 [94] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@5
-Simple Condition (bool~) print_str_lines::$3 [97] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@4
+Simple Condition (bool~) print_str_lines::$3 [97] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@4
 Simple Condition (bool~) print_ln::$1 [115] if((byte*) print_line_cursor#19<(byte*) print_char_cursor#32) goto print_ln::@1
 Simple Condition (bool~) bitmap_init::$4 [207] if((byte) bitmap_init::bits#1!=(byte) 0) goto bitmap_init::@2
 Simple Condition (bool~) bitmap_init::$5 [211] if((byte) bitmap_init::x#1!=rangelast(0,$ff)) goto bitmap_init::@1
@@ -12472,7 +12486,7 @@ print_str_lines::@1: scope:[print_str_lines]  from print_str_lines print_str_lin
   [865] (byte*) print_line_cursor#17 ← phi( print_str_lines/(const byte*) menu::SCREEN#0 print_str_lines::@6/(byte*) print_line_cursor#19 )
   [865] (byte*) print_char_cursor#19 ← phi( print_str_lines/(const byte*) menu::SCREEN#0 print_str_lines::@6/(byte*~) print_char_cursor#100 )
   [865] (byte*) print_str_lines::str#2 ← phi( print_str_lines/(const byte[]) MENU_TEXT#0 print_str_lines::@6/(byte*) print_str_lines::str#0 )
-  [866] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@2
+  [866] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@2
   to:print_str_lines::@return
 print_str_lines::@return: scope:[print_str_lines]  from print_str_lines::@1
   [867] return 
@@ -12482,7 +12496,7 @@ print_str_lines::@2: scope:[print_str_lines]  from print_str_lines::@1 print_str
   [868] (byte*) print_str_lines::str#3 ← phi( print_str_lines::@1/(byte*) print_str_lines::str#2 print_str_lines::@3/(byte*) print_str_lines::str#0 )
   [869] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#3)
   [870] (byte*) print_str_lines::str#0 ← ++ (byte*) print_str_lines::str#3
-  [871] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3
+  [871] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3
   to:print_str_lines::@4
 print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   [872] *((byte*) print_char_cursor#17) ← (byte) print_str_lines::ch#0
@@ -12490,7 +12504,7 @@ print_str_lines::@4: scope:[print_str_lines]  from print_str_lines::@2
   to:print_str_lines::@3
 print_str_lines::@3: scope:[print_str_lines]  from print_str_lines::@2 print_str_lines::@4
   [874] (byte*) print_char_cursor#32 ← phi( print_str_lines::@2/(byte*) print_char_cursor#17 print_str_lines::@4/(byte*) print_char_cursor#1 )
-  [875] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2
+  [875] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2
   to:print_str_lines::@5
 print_str_lines::@5: scope:[print_str_lines]  from print_str_lines::@3
   [876] phi()
@@ -19298,10 +19312,10 @@ print_str_lines: {
     jmp b1
     // print_str_lines::@1
   b1:
-    // [866] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [866] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2_from_b1
     jmp breturn
     // print_str_lines::@return
@@ -19325,8 +19339,8 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    // [871] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3 -- vbuz1_eq_vbuc1_then_la1 
+    // [871] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3 -- vbuc1_eq_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     cmp ch
     beq b3_from_b2
     jmp b4
@@ -19348,8 +19362,8 @@ print_str_lines: {
     jmp b3
     // print_str_lines::@3
   b3:
-    // [875] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2 -- vbuz1_neq_vbuc1_then_la1 
+    // [875] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2 -- vbuc1_neq_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     cmp ch
     bne b2_from_b3
     // [876] phi from print_str_lines::@3 to print_str_lines::@5 [phi:print_str_lines::@3->print_str_lines::@5]
@@ -19954,7 +19968,7 @@ Statement [852] (byte~) mode_stdchar::$28 ← (byte~) mode_stdchar::$27 << (byte
 Statement [853] (byte~) mode_stdchar::$29 ← (byte) mode_stdchar::cx#2 & (byte) $f [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 mode_stdchar::$28 mode_stdchar::$29 ] ( main:2::menu:9::mode_stdchar:40 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 mode_stdchar::$28 mode_stdchar::$29 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:291 [ mode_stdchar::$28 ]
 Statement [855] *((byte*) mode_stdchar::ch#2) ← (byte~) mode_stdchar::$30 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 ] ( main:2::menu:9::mode_stdchar:40 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 ] ) always clobbers reg byte y 
-Statement [866] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@2 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ( main:2::menu:9::print_str_lines:33 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ) always clobbers reg byte a reg byte y 
+Statement [866] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@2 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ( main:2::menu:9::print_str_lines:33 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ) always clobbers reg byte a reg byte y 
 Statement [869] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#3) [ print_line_cursor#17 print_str_lines::str#3 print_char_cursor#17 print_str_lines::ch#0 ] ( main:2::menu:9::print_str_lines:33 [ print_line_cursor#17 print_str_lines::str#3 print_char_cursor#17 print_str_lines::ch#0 ] ) always clobbers reg byte a reg byte y 
 Statement [872] *((byte*) print_char_cursor#17) ← (byte) print_str_lines::ch#0 [ print_line_cursor#17 print_str_lines::str#0 print_char_cursor#17 print_str_lines::ch#0 ] ( main:2::menu:9::print_str_lines:33 [ print_line_cursor#17 print_str_lines::str#0 print_char_cursor#17 print_str_lines::ch#0 ] ) always clobbers reg byte y 
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:294 [ print_str_lines::ch#0 ]
@@ -20263,7 +20277,7 @@ Statement [851] (byte~) mode_stdchar::$27 ← (byte) mode_stdchar::cy#4 & (byte)
 Statement [852] (byte~) mode_stdchar::$28 ← (byte~) mode_stdchar::$27 << (byte) 4 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 mode_stdchar::$28 ] ( main:2::menu:9::mode_stdchar:40 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 mode_stdchar::$28 ] ) always clobbers reg byte a 
 Statement [853] (byte~) mode_stdchar::$29 ← (byte) mode_stdchar::cx#2 & (byte) $f [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 mode_stdchar::$28 mode_stdchar::$29 ] ( main:2::menu:9::mode_stdchar:40 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 mode_stdchar::$28 mode_stdchar::$29 ] ) always clobbers reg byte a 
 Statement [855] *((byte*) mode_stdchar::ch#2) ← (byte~) mode_stdchar::$30 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 ] ( main:2::menu:9::mode_stdchar:40 [ mode_stdchar::cy#4 mode_stdchar::col#1 mode_stdchar::cx#2 mode_stdchar::ch#2 ] ) always clobbers reg byte y 
-Statement [866] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@2 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ( main:2::menu:9::print_str_lines:33 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ) always clobbers reg byte a reg byte y 
+Statement [866] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@2 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ( main:2::menu:9::print_str_lines:33 [ print_str_lines::str#2 print_char_cursor#19 print_line_cursor#17 ] ) always clobbers reg byte a reg byte y 
 Statement [869] (byte) print_str_lines::ch#0 ← *((byte*) print_str_lines::str#3) [ print_line_cursor#17 print_str_lines::str#3 print_char_cursor#17 print_str_lines::ch#0 ] ( main:2::menu:9::print_str_lines:33 [ print_line_cursor#17 print_str_lines::str#3 print_char_cursor#17 print_str_lines::ch#0 ] ) always clobbers reg byte a reg byte y 
 Statement [872] *((byte*) print_char_cursor#17) ← (byte) print_str_lines::ch#0 [ print_line_cursor#17 print_str_lines::str#0 print_char_cursor#17 print_str_lines::ch#0 ] ( main:2::menu:9::print_str_lines:33 [ print_line_cursor#17 print_str_lines::str#0 print_char_cursor#17 print_str_lines::ch#0 ] ) always clobbers reg byte y 
 Statement [878] (byte*~) print_char_cursor#100 ← (byte*) print_line_cursor#19 [ print_str_lines::str#0 print_char_cursor#100 print_line_cursor#19 ] ( main:2::menu:9::print_str_lines:33 [ print_str_lines::str#0 print_char_cursor#100 print_line_cursor#19 ] ) always clobbers reg byte a 
@@ -25654,10 +25668,10 @@ print_str_lines: {
     jmp b1
     // print_str_lines::@1
   b1:
-    // [866] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [866] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2_from_b1
     jmp breturn
     // print_str_lines::@return
@@ -25680,8 +25694,8 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    // [871] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3 -- vbuaa_eq_vbuc1_then_la1 
+    // [871] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3 -- vbuc1_eq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     beq b3_from_b2
     jmp b4
     // print_str_lines::@4
@@ -25701,8 +25715,8 @@ print_str_lines: {
     jmp b3
     // print_str_lines::@3
   b3:
-    // [875] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2 -- vbuaa_neq_vbuc1_then_la1 
+    // [875] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2 -- vbuc1_neq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     bne b2_from_b3
     // [876] phi from print_str_lines::@3 to print_str_lines::@5 [phi:print_str_lines::@3->print_str_lines::@5]
   b5_from_b3:
@@ -32576,11 +32590,11 @@ print_str_lines: {
     sta str+1
     // print_str_lines::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [866] if(*((byte*) print_str_lines::str#2)!=(byte) '@') goto print_str_lines::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [866] if((byte) 0!=*((byte*) print_str_lines::str#2)) goto print_str_lines::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str_lines::@return
     // }
@@ -32600,9 +32614,9 @@ print_str_lines: {
     bne !+
     inc str+1
   !:
-    // if(ch!='@')
+    // if(ch)
-    // [871] if((byte) print_str_lines::ch#0==(byte) '@') goto print_str_lines::@3 -- vbuaa_eq_vbuc1_then_la1 
+    // [871] if((byte) 0==(byte) print_str_lines::ch#0) goto print_str_lines::@3 -- vbuc1_eq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     beq b3
     // print_str_lines::@4
     // *(print_char_cursor++) = ch
@@ -32619,9 +32633,9 @@ print_str_lines: {
     // [874] phi (byte*) print_char_cursor#32 = (byte*) print_char_cursor#17 [phi:print_str_lines::@2/print_str_lines::@4->print_str_lines::@3#0] -- register_copy 
     // print_str_lines::@3
   b3:
-    // while (ch!='@')
+    // while (ch)
-    // [875] if((byte) print_str_lines::ch#0!=(byte) '@') goto print_str_lines::@2 -- vbuaa_neq_vbuc1_then_la1 
+    // [875] if((byte) 0!=(byte) print_str_lines::ch#0) goto print_str_lines::@2 -- vbuc1_neq_vbuaa_then_la1 
-    cmp #'@'
+    cmp #0
     bne b2
     // [876] phi from print_str_lines::@3 to print_str_lines::@5 [phi:print_str_lines::@3->print_str_lines::@5]
     // print_str_lines::@5

src/test/ref/cia-timer-cyclecount.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 
 Culled Empty Block (label) @1

src/test/ref/cia-timer-simple.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 
 Culled Empty Block (label) @1

src/test/ref/complex/splines/truetype-splines.log

@@ -364,6 +364,11 @@ Rewriting struct pointer member access *((struct SplineVector16*) show_letter::$
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
 Warning! Adding boolean cast to non-boolean condition (number~) abs_u16::$1
 Warning! Adding boolean cast to non-boolean condition (number~) sgn_u16::$1
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 
 Inlined call call mulf8s_prepare (signed byte) mulf8s::a 

src/test/ref/constants.asm

@@ -110,7 +110,7 @@ print_str: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/constants.cfg

@@ -82,7 +82,7 @@ print_str: scope:[print_str]  from assert_byte assert_byte::@1 assert_byte::@3 a
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [37] (byte*) print_char_cursor#2 ← phi( print_str/(byte*) print_char_cursor#80 print_str::@2/(byte*) print_char_cursor#1 )
   [37] (byte*) print_str::str#10 ← phi( print_str/(byte*) print_str::str#11 print_str::@2/(byte*) print_str::str#0 )
-  [38] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2
+  [38] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [39] return 

src/test/ref/constants.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (byte) test_bytes::bb
 Identified constant variable (signed byte) test_sbytes::bb
@@ -114,7 +119,7 @@ print_str: scope:[print_str]  from assert_byte assert_byte::@1 assert_byte::@3 a
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   (byte*) print_char_cursor#66 ← phi( print_str/(byte*) print_char_cursor#80 print_str::@2/(byte*) print_char_cursor#1 )
   (byte*) print_str::str#9 ← phi( print_str/(byte*) print_str::str#11 print_str::@2/(byte*) print_str::str#0 )
-  (bool~) print_str::$0 ← *((byte*) print_str::str#9) != (byte) '@'
+  (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#9)
   if((bool~) print_str::$0) goto print_str::@2
   to:print_str::@return
 print_str::@2: scope:[print_str]  from print_str::@1
@@ -857,6 +862,7 @@ SYMBOL TABLE SSA
 (const string) test_sbytes::msg4 = (string) "-127-127=2"
 
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#9)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#24 + (number) $28
 Adding number conversion cast (unumber) $3e8 in (word) memset::num#0 ← (number) $3e8
 Adding number conversion cast (unumber) 5 in (byte) GREEN#0 ← (number) 5
@@ -903,6 +909,7 @@ Inlining cast (signed byte) assert_sbyte::c#4 ← (snumber)(number) 2
 Successful SSA optimization Pass2InlineCast
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast $3e8
 Simplifying constant pointer cast (byte*) 53281
@@ -924,6 +931,7 @@ Simplifying constant integer cast 2
 Simplifying constant integer cast 2
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized unsigned number type (word) $3e8
 Finalized unsigned number type (byte) 5
@@ -1077,7 +1085,7 @@ Identical Phi Values (byte*) print_char_cursor#67 (byte*) print_char_cursor#2
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) memset::$1 [3] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [13] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str::$0 [26] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2
+Simple Condition (bool~) print_str::$0 [26] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2
 Simple Condition (bool~) print_ln::$1 [39] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#2) goto print_ln::@1
 Simple Condition (bool~) assert_byte::$2 [124] if((byte) assert_byte::b#3!=(byte) assert_byte::c#3) goto assert_byte::@1
 Simple Condition (bool~) assert_sbyte::$2 [204] if((signed byte) assert_sbyte::b#5!=(signed byte) assert_sbyte::c#5) goto assert_sbyte::@1
@@ -1448,7 +1456,7 @@ print_str: scope:[print_str]  from assert_byte assert_byte::@1 assert_byte::@3 a
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [37] (byte*) print_char_cursor#2 ← phi( print_str/(byte*) print_char_cursor#80 print_str::@2/(byte*) print_char_cursor#1 )
   [37] (byte*) print_str::str#10 ← phi( print_str/(byte*) print_str::str#11 print_str::@2/(byte*) print_str::str#0 )
-  [38] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2
+  [38] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [39] return 
@@ -1913,10 +1921,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [38] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [38] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -2230,7 +2238,7 @@ Removing always clobbered register reg byte a as potential for zp ZP_BYTE:4 [ as
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:5 [ assert_sbyte::c#5 ]
 Statement [24] (byte*~) print_char_cursor#86 ← (byte*) print_line_cursor#1 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] ( main:2::test_sbytes:9::assert_sbyte:12 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:14 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:16 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:18 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:20 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] ) always clobbers reg byte a 
 Statement [34] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::test_sbytes:9::assert_sbyte:12 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:14 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:16 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:18 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:20 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
-Statement [38] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::test_sbytes:9::assert_sbyte:12::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
+Statement [38] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::test_sbytes:9::assert_sbyte:12::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:4 [ assert_sbyte::b#5 ]
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:5 [ assert_sbyte::c#5 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:14 [ assert_byte::b#3 ]
@@ -2250,7 +2258,7 @@ Statement [6] *((const byte*) BGCOL#0) ← (const byte) GREEN#0 [ ] ( main:2 [ ]
 Statement [23] (byte*) print_str::str#5 ← (byte*) assert_sbyte::msg#5 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_line_cursor#1 ] ( main:2::test_sbytes:9::assert_sbyte:12 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:14 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:16 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:18 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:20 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_line_cursor#1 ] ) always clobbers reg byte a 
 Statement [24] (byte*~) print_char_cursor#86 ← (byte*) print_line_cursor#1 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] ( main:2::test_sbytes:9::assert_sbyte:12 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:14 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:16 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:18 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] main:2::test_sbytes:9::assert_sbyte:20 [ assert_sbyte::b#5 assert_sbyte::c#5 print_str::str#5 print_char_cursor#86 print_line_cursor#1 ] ) always clobbers reg byte a 
 Statement [34] *((const byte*) BGCOL#0) ← (const byte) RED#0 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::test_sbytes:9::assert_sbyte:12 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:14 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:16 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:18 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:20 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
-Statement [38] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::test_sbytes:9::assert_sbyte:12::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
+Statement [38] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::test_sbytes:9::assert_sbyte:12::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
 Statement [40] *((byte*) print_char_cursor#2) ← *((byte*) print_str::str#10) [ print_char_cursor#2 print_str::str#10 ] ( main:2::test_sbytes:9::assert_sbyte:12::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:25 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:27 [ assert_sbyte::b#5 assert_sbyte::c#5 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:30 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:12::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:14::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:16::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:18::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_sbytes:9::assert_sbyte:20::print_str:35 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:57 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:59 [ print_line_cursor#50 assert_byte::b#3 assert_byte::c#3 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:62 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:49::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:51::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] main:2::test_bytes:7::assert_byte:53::print_str:67 [ print_line_cursor#50 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
 Statement [45] (byte*) print_line_cursor#1 ← (byte*) print_line_cursor#24 + (byte) $28 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::test_sbytes:9::assert_sbyte:12::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:14::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:16::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:18::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:20::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_bytes:7::assert_byte:49::print_ln:64 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_bytes:7::assert_byte:51::print_ln:64 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_bytes:7::assert_byte:53::print_ln:64 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
 Statement [46] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#2) goto print_ln::@1 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::test_sbytes:9::assert_sbyte:12::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:14::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:16::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:18::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_sbytes:9::assert_sbyte:20::print_ln:32 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_bytes:7::assert_byte:49::print_ln:64 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_bytes:7::assert_byte:51::print_ln:64 [ print_line_cursor#1 print_char_cursor#2 ] main:2::test_bytes:7::assert_byte:53::print_ln:64 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
@@ -2576,10 +2584,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [38] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [38] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -3363,11 +3371,11 @@ print_str: {
     // [37] phi (byte*) print_str::str#10 = (byte*) print_str::str#11 [phi:print_str/print_str::@2->print_str::@1#1] -- register_copy 
     // print_str::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [38] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [38] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str::@return
     // }

src/test/ref/cordic-atan2-16-ref.log

@@ -8,7 +8,12 @@ Fixing pointer array-indexing *((word[CORDIC_ITERATIONS_16]) CORDIC_ATAN2_ANGLES
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
 Warning! Adding boolean cast to non-boolean sub-expression (byte) atan2_16::shift
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 
 Inlined call (byte~) main::$1 ← call toD018 (byte*) SCREEN (byte*) CHARSET 

src/test/ref/euclid-3.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Culled Empty Block (label) @1
 Culled Empty Block (label) @2

src/test/ref/examples/3d/3d.asm

@@ -943,7 +943,7 @@ print_str_at: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/examples/3d/3d.cfg

@@ -426,7 +426,7 @@ print_str_at: scope:[print_str_at]  from debug_print_init::@10 debug_print_init:
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   [244] (byte*) print_str_at::at#13 ← phi( print_str_at/(byte*) print_str_at::at#15 print_str_at::@2/(byte*) print_str_at::at#0 )
   [244] (byte*) print_str_at::str#13 ← phi( print_str_at/(byte*) print_str_at::str#15 print_str_at::@2/(byte*) print_str_at::str#0 )
-  [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2
+  [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@return: scope:[print_str_at]  from print_str_at::@1
   [246] return 

src/test/ref/examples/3d/3d.log

@@ -95,6 +95,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (signed byte*) xr
 Identified constant variable (signed byte*) yr
@@ -275,7 +280,7 @@ print_str_at: scope:[print_str_at]  from debug_print_init::@10 debug_print_init:
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   (byte*) print_str_at::at#14 ← phi( print_str_at/(byte*) print_str_at::at#15 print_str_at::@2/(byte*) print_str_at::at#0 )
   (byte*) print_str_at::str#13 ← phi( print_str_at/(byte*) print_str_at::str#15 print_str_at::@2/(byte*) print_str_at::str#0 )
-  (bool~) print_str_at::$0 ← *((byte*) print_str_at::str#13) != (byte) '@'
+  (bool~) print_str_at::$0 ← (number) 0 != *((byte*) print_str_at::str#13)
   if((bool~) print_str_at::$0) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@2: scope:[print_str_at]  from print_str_at::@1
@@ -2242,6 +2247,7 @@ Adding number conversion cast (unumber) 5 in (byte) GREEN#0 ← (number) 5
 Adding number conversion cast (unumber) $e in (byte) LIGHT_BLUE#0 ← (number) $e
 Adding number conversion cast (unumber) $f in (byte) LIGHT_GREY#0 ← (number) $f
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str_at::$0 ← (number) 0 != *((byte*) print_str_at::str#13)
 Adding number conversion cast (snumber) 0 in (bool~) print_sbyte_at::$0 ← (signed byte) print_sbyte_at::b#22 < (number) 0
 Adding number conversion cast (unumber) 1 in (byte*~) print_sbyte_at::$2 ← (byte*) print_sbyte_at::at#23 + (number) 1
 Adding number conversion cast (unumber) 4 in (byte~) print_byte_at::$0 ← (byte) print_byte_at::b#1 >> (number) 4
@@ -2455,6 +2461,7 @@ Simplifying constant integer cast $f
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast 1
 Simplifying constant integer cast 4
 Simplifying constant integer cast $f
@@ -2579,6 +2586,7 @@ Finalized unsigned number type (byte) 5
 Finalized unsigned number type (byte) $e
 Finalized unsigned number type (byte) $f
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized signed number type (signed byte) 0
 Finalized unsigned number type (byte) 1
 Finalized unsigned number type (byte) 4
@@ -2901,7 +2909,7 @@ Identical Phi Values (byte*) debug_print_init::at_cols#2 (byte*) debug_print_ini
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) memset::$1 [12] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [22] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str_at::$0 [33] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2
+Simple Condition (bool~) print_str_at::$0 [33] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2
 Simple Condition (bool~) print_sbyte_at::$0 [41] if((signed byte) print_sbyte_at::b#22<(signed byte) 0) goto print_sbyte_at::@1
 Simple Condition (bool~) anim::$0 [131] if(*((byte*) RASTER#0)!=(byte) $ff) goto anim::@4
 Simple Condition (bool~) anim::$1 [134] if(*((byte*) RASTER#0)!=(byte) $fe) goto anim::@10
@@ -4133,7 +4141,7 @@ print_str_at: scope:[print_str_at]  from debug_print_init::@10 debug_print_init:
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   [244] (byte*) print_str_at::at#13 ← phi( print_str_at/(byte*) print_str_at::at#15 print_str_at::@2/(byte*) print_str_at::at#0 )
   [244] (byte*) print_str_at::str#13 ← phi( print_str_at/(byte*) print_str_at::str#15 print_str_at::@2/(byte*) print_str_at::str#0 )
-  [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2
+  [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@return: scope:[print_str_at]  from print_str_at::@1
   [246] return 
@@ -6570,10 +6578,10 @@ print_str_at: {
     jmp b1
     // print_str_at::@1
   b1:
-    // [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str_at::@return
@@ -6917,7 +6925,7 @@ Statement [236] *((byte*~) debug_print_init::$65 + (byte) debug_print_init::j#2)
 Statement [239] (byte) debug_print_init::c#1 ← (byte) debug_print_init::c#2 + (byte) 4 [ debug_print_init::i#2 debug_print_init::c#1 ] ( main:2::debug_print_init:8 [ debug_print_init::i#2 debug_print_init::c#1 ] ) always clobbers reg byte a reg byte x 
 Removing always clobbered register reg byte x as potential for zp ZP_BYTE:14 [ debug_print_init::i#2 debug_print_init::i#1 ]
 Statement [241] if((byte) debug_print_init::i#1!=(byte) 8) goto debug_print_init::@1 [ debug_print_init::c#1 debug_print_init::i#1 ] ( main:2::debug_print_init:8 [ debug_print_init::c#1 debug_print_init::i#1 ] ) always clobbers reg byte a 
-Statement [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
+Statement [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2 [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
 Statement [247] *((byte*) print_str_at::at#13) ← *((byte*) print_str_at::str#13) [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
 Statement [255] *((byte*) memset::dst#4) ← (const byte) memset::c#0 [ memset::dst#4 ] ( main:2::debug_print_init:8::print_cls:182::memset:251 [ memset::dst#4 ] ) always clobbers reg byte a reg byte y 
 Statement [257] if((byte*) memset::dst#1!=(const byte*) memset::end#0) goto memset::@2 [ memset::dst#1 ] ( main:2::debug_print_init:8::print_cls:182::memset:251 [ memset::dst#1 ] ) always clobbers reg byte a 
@@ -7026,7 +7034,7 @@ Statement [235] (byte*~) debug_print_init::$65 ← (const byte*) debug_print_ini
 Statement [236] *((byte*~) debug_print_init::$65 + (byte) debug_print_init::j#2) ← (byte) debug_print_init::col#0 [ debug_print_init::c#2 debug_print_init::i#2 debug_print_init::j#2 ] ( main:2::debug_print_init:8 [ debug_print_init::c#2 debug_print_init::i#2 debug_print_init::j#2 ] ) always clobbers reg byte a 
 Statement [239] (byte) debug_print_init::c#1 ← (byte) debug_print_init::c#2 + (byte) 4 [ debug_print_init::i#2 debug_print_init::c#1 ] ( main:2::debug_print_init:8 [ debug_print_init::i#2 debug_print_init::c#1 ] ) always clobbers reg byte a reg byte x 
 Statement [241] if((byte) debug_print_init::i#1!=(byte) 8) goto debug_print_init::@1 [ debug_print_init::c#1 debug_print_init::i#1 ] ( main:2::debug_print_init:8 [ debug_print_init::c#1 debug_print_init::i#1 ] ) always clobbers reg byte a 
-Statement [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
+Statement [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2 [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
 Statement [247] *((byte*) print_str_at::at#13) ← *((byte*) print_str_at::str#13) [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
 Statement [255] *((byte*) memset::dst#4) ← (const byte) memset::c#0 [ memset::dst#4 ] ( main:2::debug_print_init:8::print_cls:182::memset:251 [ memset::dst#4 ] ) always clobbers reg byte a reg byte y 
 Statement [257] if((byte*) memset::dst#1!=(const byte*) memset::end#0) goto memset::@2 [ memset::dst#1 ] ( main:2::debug_print_init:8::print_cls:182::memset:251 [ memset::dst#1 ] ) always clobbers reg byte a 
@@ -7137,7 +7145,7 @@ Statement [235] (byte*~) debug_print_init::$65 ← (const byte*) debug_print_ini
 Statement [236] *((byte*~) debug_print_init::$65 + (byte) debug_print_init::j#2) ← (byte) debug_print_init::col#0 [ debug_print_init::c#2 debug_print_init::i#2 debug_print_init::j#2 ] ( main:2::debug_print_init:8 [ debug_print_init::c#2 debug_print_init::i#2 debug_print_init::j#2 ] ) always clobbers reg byte a 
 Statement [239] (byte) debug_print_init::c#1 ← (byte) debug_print_init::c#2 + (byte) 4 [ debug_print_init::i#2 debug_print_init::c#1 ] ( main:2::debug_print_init:8 [ debug_print_init::i#2 debug_print_init::c#1 ] ) always clobbers reg byte a reg byte x 
 Statement [241] if((byte) debug_print_init::i#1!=(byte) 8) goto debug_print_init::@1 [ debug_print_init::c#1 debug_print_init::i#1 ] ( main:2::debug_print_init:8 [ debug_print_init::c#1 debug_print_init::i#1 ] ) always clobbers reg byte a 
-Statement [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
+Statement [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2 [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
 Statement [247] *((byte*) print_str_at::at#13) ← *((byte*) print_str_at::str#13) [ print_str_at::str#13 print_str_at::at#13 ] ( main:2::debug_print_init:8::print_str_at:184 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:186 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:188 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:190 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:192 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:194 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:196 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:198 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:200 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:202 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:204 [ print_str_at::str#13 print_str_at::at#13 ] main:2::debug_print_init:8::print_str_at:206 [ print_str_at::str#13 print_str_at::at#13 ] ) always clobbers reg byte a reg byte y 
 Statement [255] *((byte*) memset::dst#4) ← (const byte) memset::c#0 [ memset::dst#4 ] ( main:2::debug_print_init:8::print_cls:182::memset:251 [ memset::dst#4 ] ) always clobbers reg byte a reg byte y 
 Statement [257] if((byte*) memset::dst#1!=(const byte*) memset::end#0) goto memset::@2 [ memset::dst#1 ] ( main:2::debug_print_init:8::print_cls:182::memset:251 [ memset::dst#1 ] ) always clobbers reg byte a 
@@ -9034,10 +9042,10 @@ print_str_at: {
     jmp b1
     // print_str_at::@1
   b1:
-    // [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str_at::@return
@@ -11689,11 +11697,11 @@ print_str_at: {
     // [244] phi (byte*) print_str_at::str#13 = (byte*) print_str_at::str#15 [phi:print_str_at/print_str_at::@2->print_str_at::@1#1] -- register_copy 
     // print_str_at::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [245] if(*((byte*) print_str_at::str#13)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [245] if((byte) 0!=*((byte*) print_str_at::str#13)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str_at::@return
     // }

src/test/ref/examples/3d/perspective.asm

@@ -120,7 +120,7 @@ print_str: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/examples/3d/perspective.cfg

@@ -96,7 +96,7 @@ print_str: scope:[print_str]  from do_perspective do_perspective::@11 do_perspec
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [45] (byte*) print_char_cursor#2 ← phi( print_str/(byte*) print_char_cursor#74 print_str::@2/(byte*) print_char_cursor#1 )
   [45] (byte*) print_str::str#7 ← phi( print_str/(byte*) print_str::str#9 print_str::@2/(byte*) print_str::str#0 )
-  [46] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2
+  [46] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [47] return 

src/test/ref/examples/3d/perspective.log

@@ -7,6 +7,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (signed byte*) xr
 Identified constant variable (signed byte*) yr
@@ -122,7 +127,7 @@ print_str: scope:[print_str]  from do_perspective do_perspective::@11 do_perspec
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   (byte*) print_char_cursor#64 ← phi( print_str/(byte*) print_char_cursor#74 print_str::@2/(byte*) print_char_cursor#1 )
   (byte*) print_str::str#7 ← phi( print_str/(byte*) print_str::str#9 print_str::@2/(byte*) print_str::str#0 )
-  (bool~) print_str::$0 ← *((byte*) print_str::str#7) != (byte) '@'
+  (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#7)
   if((bool~) print_str::$0) goto print_str::@2
   to:print_str::@return
 print_str::@2: scope:[print_str]  from print_str::@1
@@ -905,6 +910,7 @@ SYMBOL TABLE SSA
 (signed byte*) zr#0
 
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#7)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#11 + (number) $28
 Adding number conversion cast (snumber) 0 in (bool~) print_sbyte::$0 ← (signed byte) print_sbyte::b#4 < (number) 0
 Adding number conversion cast (unumber) 4 in (byte~) print_byte::$0 ← (byte) print_byte::b#3 >> (number) 4
@@ -952,6 +958,7 @@ Inlining cast (signed word) mulf_init::add#0 ← (snumber)(number) 1
 Successful SSA optimization Pass2InlineCast
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast 0
 Simplifying constant integer cast 4
@@ -978,6 +985,7 @@ Simplifying constant integer cast 1
 Simplifying constant integer cast 2
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized signed number type (signed byte) 0
 Finalized unsigned number type (byte) 4
@@ -1114,7 +1122,7 @@ Identified duplicate assignment right side [215] (byte~) mulf_init::$4 ← - (by
 Successful SSA optimization Pass2DuplicateRValueIdentification
 Simple Condition (bool~) memset::$1 [3] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [13] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str::$0 [26] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2
+Simple Condition (bool~) print_str::$0 [26] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2
 Simple Condition (bool~) print_ln::$1 [39] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#2) goto print_ln::@1
 Simple Condition (bool~) print_sbyte::$0 [48] if((signed byte) print_sbyte::b#4<(signed byte) 0) goto print_sbyte::@1
 Simple Condition (bool~) mulf_init::$11 [231] if((byte) mulf_init::i#1!=rangelast(0,$80)) goto mulf_init::@1
@@ -1480,7 +1488,7 @@ print_str: scope:[print_str]  from do_perspective do_perspective::@11 do_perspec
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [45] (byte*) print_char_cursor#2 ← phi( print_str/(byte*) print_char_cursor#74 print_str::@2/(byte*) print_char_cursor#1 )
   [45] (byte*) print_str::str#7 ← phi( print_str/(byte*) print_str::str#9 print_str::@2/(byte*) print_str::str#0 )
-  [46] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2
+  [46] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [47] return 
@@ -2039,10 +2047,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [46] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [46] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -2451,7 +2459,7 @@ Statement [6] *((const word*) psp1#0) ← (word)(const byte[$200]) mulf_sqr1#0 [
 Statement [7] *((const word*) psp2#0) ← (word)(const byte[$200]) mulf_sqr2#0 [ ] ( main:2 [ ] ) always clobbers reg byte a 
 Statement [41] (byte*) print_line_cursor#1 ← (byte*) print_line_cursor#11 + (byte) $28 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::do_perspective:10::print_ln:37 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
 Statement [42] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#2) goto print_ln::@1 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::do_perspective:10::print_ln:37 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
-Statement [46] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2 [ print_char_cursor#2 print_str::str#7 ] ( main:2::do_perspective:10::print_str:13 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:17 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:21 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:25 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:31 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:35 [ print_char_cursor#2 print_str::str#7 ] ) always clobbers reg byte a reg byte y 
+Statement [46] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2 [ print_char_cursor#2 print_str::str#7 ] ( main:2::do_perspective:10::print_str:13 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:17 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:21 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:25 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:31 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:35 [ print_char_cursor#2 print_str::str#7 ] ) always clobbers reg byte a reg byte y 
 Statement [48] *((byte*) print_char_cursor#2) ← *((byte*) print_str::str#7) [ print_char_cursor#2 print_str::str#7 ] ( main:2::do_perspective:10::print_str:13 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:17 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:21 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:25 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:31 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:35 [ print_char_cursor#2 print_str::str#7 ] ) always clobbers reg byte a reg byte y 
 Statement [52] (byte~) print_byte::$0 ← (byte) print_byte::b#3 >> (byte) 4 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] ( main:2::do_perspective:10::print_byte:29 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_byte:33 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_sbyte:15::print_byte:74 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_sbyte:19::print_byte:74 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_sbyte:23::print_byte:74 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:6 [ print_byte::b#3 print_byte::b#5 print_byte::b#6 print_byte::b#0 ]
@@ -2485,7 +2493,7 @@ Statement [6] *((const word*) psp1#0) ← (word)(const byte[$200]) mulf_sqr1#0 [
 Statement [7] *((const word*) psp2#0) ← (word)(const byte[$200]) mulf_sqr2#0 [ ] ( main:2 [ ] ) always clobbers reg byte a 
 Statement [41] (byte*) print_line_cursor#1 ← (byte*) print_line_cursor#11 + (byte) $28 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::do_perspective:10::print_ln:37 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
 Statement [42] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#2) goto print_ln::@1 [ print_line_cursor#1 print_char_cursor#2 ] ( main:2::do_perspective:10::print_ln:37 [ print_line_cursor#1 print_char_cursor#2 ] ) always clobbers reg byte a 
-Statement [46] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2 [ print_char_cursor#2 print_str::str#7 ] ( main:2::do_perspective:10::print_str:13 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:17 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:21 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:25 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:31 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:35 [ print_char_cursor#2 print_str::str#7 ] ) always clobbers reg byte a reg byte y 
+Statement [46] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2 [ print_char_cursor#2 print_str::str#7 ] ( main:2::do_perspective:10::print_str:13 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:17 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:21 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:25 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:31 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:35 [ print_char_cursor#2 print_str::str#7 ] ) always clobbers reg byte a reg byte y 
 Statement [48] *((byte*) print_char_cursor#2) ← *((byte*) print_str::str#7) [ print_char_cursor#2 print_str::str#7 ] ( main:2::do_perspective:10::print_str:13 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:17 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:21 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:25 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:31 [ print_char_cursor#2 print_str::str#7 ] main:2::do_perspective:10::print_str:35 [ print_char_cursor#2 print_str::str#7 ] ) always clobbers reg byte a reg byte y 
 Statement [52] (byte~) print_byte::$0 ← (byte) print_byte::b#3 >> (byte) 4 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] ( main:2::do_perspective:10::print_byte:29 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_byte:33 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_sbyte:15::print_byte:74 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_sbyte:19::print_byte:74 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] main:2::do_perspective:10::print_sbyte:23::print_byte:74 [ print_byte::b#3 print_char_cursor#69 print_byte::$0 ] ) always clobbers reg byte a 
 Statement [55] (byte~) print_byte::$2 ← (byte) print_byte::b#3 & (byte) $f [ print_char_cursor#12 print_byte::$2 ] ( main:2::do_perspective:10::print_byte:29 [ print_char_cursor#12 print_byte::$2 ] main:2::do_perspective:10::print_byte:33 [ print_char_cursor#12 print_byte::$2 ] main:2::do_perspective:10::print_sbyte:15::print_byte:74 [ print_char_cursor#12 print_byte::$2 ] main:2::do_perspective:10::print_sbyte:19::print_byte:74 [ print_char_cursor#12 print_byte::$2 ] main:2::do_perspective:10::print_sbyte:23::print_byte:74 [ print_char_cursor#12 print_byte::$2 ] ) always clobbers reg byte a 
@@ -2873,10 +2881,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [46] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [46] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -3822,11 +3830,11 @@ print_str: {
     // [45] phi (byte*) print_str::str#7 = (byte*) print_str::str#9 [phi:print_str/print_str::@2->print_str::@1#1] -- register_copy 
     // print_str::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [46] if(*((byte*) print_str::str#7)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [46] if((byte) 0!=*((byte*) print_str::str#7)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str::@return
     // }

src/test/ref/examples/chargen/chargen-analysis.asm

@@ -395,7 +395,7 @@ print_str_at: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/examples/chargen/chargen-analysis.cfg

@@ -256,7 +256,7 @@ print_str_at: scope:[print_str_at]  from main::@17 main::@18 main::@19 main::@3
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   [128] (byte*) print_str_at::at#5 ← phi( print_str_at/(byte*) print_str_at::at#7 print_str_at::@2/(byte*) print_str_at::at#4 )
   [128] (byte*) print_str_at::str#5 ← phi( print_str_at/(byte*) print_str_at::str#7 print_str_at::@2/(byte*) print_str_at::str#4 )
-  [129] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2
+  [129] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@return: scope:[print_str_at]  from print_str_at::@1
   [130] return 

src/test/ref/examples/chargen/chargen-analysis.log

@@ -1,3 +1,4 @@
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
 Identified constant variable (byte*) SCREEN
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 
 Culled Empty Block (label) @1
@@ -431,7 +432,7 @@ print_str_at: scope:[print_str_at]  from main::@29 main::@3 main::@30 main::@31
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   (byte*) print_str_at::at#6 ← phi( print_str_at/(byte*) print_str_at::at#7 print_str_at::@2/(byte*) print_str_at::at#4 )
   (byte*) print_str_at::str#5 ← phi( print_str_at/(byte*) print_str_at::str#7 print_str_at::@2/(byte*) print_str_at::str#4 )
-  (bool~) print_str_at::$0 ← *((byte*) print_str_at::str#5) != (byte) '@'
+  (bool~) print_str_at::$0 ← (number) 0 != *((byte*) print_str_at::str#5)
   if((bool~) print_str_at::$0) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@2: scope:[print_str_at]  from print_str_at::@1
@@ -1132,6 +1133,7 @@ Adding number conversion cast (unumber) 0 in (byte) main::shift#2 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) main::pressed#0 ← (number) 0
 Adding number conversion cast (unumber) $3f in (bool~) main::$30 ← (byte) main::key#0 != (number) $3f
 Adding number conversion cast (unumber) 0 in (bool~) main::$33 ← (byte) main::pressed#2 != (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str_at::$0 ← (number) 0 != *((byte*) print_str_at::str#5)
 Adding number conversion cast (unumber) 8 in (number~) plot_chargen::$1 ← (word~) plot_chargen::$0 * (number) 8
 Adding number conversion cast (unumber) plot_chargen::$1 in (number~) plot_chargen::$1 ← (word~) plot_chargen::$0 * (unumber)(number) 8
 Adding number conversion cast (unumber) 0 in (bool~) plot_chargen::$3 ← (byte) plot_chargen::shift#2 != (number) 0
@@ -1353,6 +1355,7 @@ Simplifying constant integer cast 0
 Simplifying constant integer cast 0
 Simplifying constant integer cast $3f
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast 8
 Simplifying constant integer cast 0
 Simplifying constant integer cast $32
@@ -1455,6 +1458,7 @@ Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $3f
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 8
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $32
@@ -1579,7 +1583,7 @@ Simple Condition (bool~) main::$28 [200] if((byte~) main::$27!=(byte) 0) goto ma
 Simple Condition (bool~) main::$31 [218] if((byte) main::key#0==(byte) $3f) goto main::@17
 Simple Condition (bool~) main::$34 [222] if((byte) main::pressed#2==(byte) 0) goto main::@18
 Simple Condition (bool~) main::$36 [233] if((byte) main::ch#1!=rangelast(0,$3f)) goto main::@16
-Simple Condition (bool~) print_str_at::$0 [246] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2
+Simple Condition (bool~) print_str_at::$0 [246] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2
 Simple Condition (bool~) plot_chargen::$4 [260] if((byte) plot_chargen::shift#2==(byte) 0) goto plot_chargen::@1
 Simple Condition (bool~) plot_chargen::$12 [285] if((byte~) plot_chargen::$10==(byte) 0) goto plot_chargen::@5
 Simple Condition (bool~) plot_chargen::$14 [293] if((byte) plot_chargen::x#1!=rangelast(0,7)) goto plot_chargen::@4
@@ -2220,7 +2224,7 @@ print_str_at: scope:[print_str_at]  from main::@17 main::@18 main::@19 main::@3
 print_str_at::@1: scope:[print_str_at]  from print_str_at print_str_at::@2
   [128] (byte*) print_str_at::at#5 ← phi( print_str_at/(byte*) print_str_at::at#7 print_str_at::@2/(byte*) print_str_at::at#4 )
   [128] (byte*) print_str_at::str#5 ← phi( print_str_at/(byte*) print_str_at::str#7 print_str_at::@2/(byte*) print_str_at::str#4 )
-  [129] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2
+  [129] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2
   to:print_str_at::@return
 print_str_at::@return: scope:[print_str_at]  from print_str_at::@1
   [130] return 
@@ -3512,10 +3516,10 @@ print_str_at: {
     jmp b1
     // print_str_at::@1
   b1:
-    // [129] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [129] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str_at::@return
@@ -3585,7 +3589,7 @@ Statement [115] (byte) keyboard_key_pressed::rowidx#0 ← (byte) keyboard_key_pr
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:54 [ keyboard_key_pressed::colidx#0 ]
 Statement [122] *((const byte*) CIA1_PORT_A#0) ← *((const byte[8]) keyboard_matrix_row_bitmask#0 + (byte) keyboard_matrix_read::rowid#0) [ ] ( main:2::keyboard_key_pressed:23::keyboard_matrix_read:117 [ main::cur_pos#24 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:29::keyboard_matrix_read:117 [ main::cur_pos#22 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:35::keyboard_matrix_read:117 [ main::cur_pos#20 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:41::keyboard_matrix_read:117 [ main::cur_pos#18 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:47::keyboard_matrix_read:117 [ main::cur_pos#11 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:60::keyboard_matrix_read:117 [ main::cur_pos#11 main::shift#9 main::ch#2 keyboard_key_pressed::colidx#0 ] ) always clobbers reg byte a 
 Statement [123] (byte) keyboard_matrix_read::return#0 ← ~ *((const byte*) CIA1_PORT_B#0) [ keyboard_matrix_read::return#0 ] ( main:2::keyboard_key_pressed:23::keyboard_matrix_read:117 [ main::cur_pos#24 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:29::keyboard_matrix_read:117 [ main::cur_pos#22 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:35::keyboard_matrix_read:117 [ main::cur_pos#20 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:41::keyboard_matrix_read:117 [ main::cur_pos#18 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:47::keyboard_matrix_read:117 [ main::cur_pos#11 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:60::keyboard_matrix_read:117 [ main::cur_pos#11 main::shift#9 main::ch#2 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] ) always clobbers reg byte a 
-Statement [129] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#5 print_str_at::at#5 ] ( main:2::print_str_at:10 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:12 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:14 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:16 [ print_str_at::str#5 print_str_at::at#5 ] ) always clobbers reg byte a reg byte y 
+Statement [129] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2 [ print_str_at::str#5 print_str_at::at#5 ] ( main:2::print_str_at:10 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:12 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:14 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:16 [ print_str_at::str#5 print_str_at::at#5 ] ) always clobbers reg byte a reg byte y 
 Statement [131] *((byte*) print_str_at::at#5) ← *((byte*) print_str_at::str#5) [ print_str_at::str#5 print_str_at::at#5 ] ( main:2::print_str_at:10 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:12 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:14 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:16 [ print_str_at::str#5 print_str_at::at#5 ] ) always clobbers reg byte a reg byte y 
 Statement [6] *((byte*) main::sc#4) ← (byte) ' ' [ main::sc#4 ] ( main:2 [ main::sc#4 ] ) always clobbers reg byte a reg byte y 
 Statement [8] if((byte*) main::sc#1<(const byte*) SCREEN#0+(word) $3e8) goto main::@2 [ main::sc#1 ] ( main:2 [ main::sc#1 ] ) always clobbers reg byte a 
@@ -3606,7 +3610,7 @@ Statement [109] (word) mul8u::res#1 ← (word) mul8u::res#2 + (word) mul8u::mb#2
 Statement [115] (byte) keyboard_key_pressed::rowidx#0 ← (byte) keyboard_key_pressed::key#6 >> (byte) 3 [ keyboard_key_pressed::colidx#0 keyboard_key_pressed::rowidx#0 ] ( main:2::keyboard_key_pressed:23 [ main::cur_pos#24 keyboard_key_pressed::colidx#0 keyboard_key_pressed::rowidx#0 ] main:2::keyboard_key_pressed:29 [ main::cur_pos#22 keyboard_key_pressed::colidx#0 keyboard_key_pressed::rowidx#0 ] main:2::keyboard_key_pressed:35 [ main::cur_pos#20 keyboard_key_pressed::colidx#0 keyboard_key_pressed::rowidx#0 ] main:2::keyboard_key_pressed:41 [ main::cur_pos#18 keyboard_key_pressed::colidx#0 keyboard_key_pressed::rowidx#0 ] main:2::keyboard_key_pressed:47 [ main::cur_pos#11 keyboard_key_pressed::colidx#0 keyboard_key_pressed::rowidx#0 ] main:2::keyboard_key_pressed:60 [ main::cur_pos#11 main::shift#9 main::ch#2 keyboard_key_pressed::colidx#0 keyboard_key_pressed::rowidx#0 ] ) always clobbers reg byte a 
 Statement [122] *((const byte*) CIA1_PORT_A#0) ← *((const byte[8]) keyboard_matrix_row_bitmask#0 + (byte) keyboard_matrix_read::rowid#0) [ ] ( main:2::keyboard_key_pressed:23::keyboard_matrix_read:117 [ main::cur_pos#24 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:29::keyboard_matrix_read:117 [ main::cur_pos#22 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:35::keyboard_matrix_read:117 [ main::cur_pos#20 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:41::keyboard_matrix_read:117 [ main::cur_pos#18 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:47::keyboard_matrix_read:117 [ main::cur_pos#11 keyboard_key_pressed::colidx#0 ] main:2::keyboard_key_pressed:60::keyboard_matrix_read:117 [ main::cur_pos#11 main::shift#9 main::ch#2 keyboard_key_pressed::colidx#0 ] ) always clobbers reg byte a 
 Statement [123] (byte) keyboard_matrix_read::return#0 ← ~ *((const byte*) CIA1_PORT_B#0) [ keyboard_matrix_read::return#0 ] ( main:2::keyboard_key_pressed:23::keyboard_matrix_read:117 [ main::cur_pos#24 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:29::keyboard_matrix_read:117 [ main::cur_pos#22 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:35::keyboard_matrix_read:117 [ main::cur_pos#20 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:41::keyboard_matrix_read:117 [ main::cur_pos#18 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:47::keyboard_matrix_read:117 [ main::cur_pos#11 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] main:2::keyboard_key_pressed:60::keyboard_matrix_read:117 [ main::cur_pos#11 main::shift#9 main::ch#2 keyboard_key_pressed::colidx#0 keyboard_matrix_read::return#0 ] ) always clobbers reg byte a 
-Statement [129] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2 [ print_str_at::str#5 print_str_at::at#5 ] ( main:2::print_str_at:10 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:12 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:14 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:16 [ print_str_at::str#5 print_str_at::at#5 ] ) always clobbers reg byte a reg byte y 
+Statement [129] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2 [ print_str_at::str#5 print_str_at::at#5 ] ( main:2::print_str_at:10 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:12 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:14 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:16 [ print_str_at::str#5 print_str_at::at#5 ] ) always clobbers reg byte a reg byte y 
 Statement [131] *((byte*) print_str_at::at#5) ← *((byte*) print_str_at::str#5) [ print_str_at::str#5 print_str_at::at#5 ] ( main:2::print_str_at:10 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:12 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:14 [ print_str_at::str#5 print_str_at::at#5 ] main:2::print_str_at:16 [ print_str_at::str#5 print_str_at::at#5 ] ) always clobbers reg byte a reg byte y 
 Potential registers zp ZP_WORD:2 [ main::sc#4 main::sc#1 ] : zp ZP_WORD:2 , 
 Potential registers zp ZP_BYTE:4 [ main::i#2 main::i#1 ] : zp ZP_BYTE:4 , reg byte x , 
@@ -4567,10 +4571,10 @@ print_str_at: {
     jmp b1
     // print_str_at::@1
   b1:
-    // [129] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [129] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str_at::@return
@@ -5888,11 +5892,11 @@ print_str_at: {
     // [128] phi (byte*) print_str_at::str#5 = (byte*) print_str_at::str#7 [phi:print_str_at/print_str_at::@2->print_str_at::@1#1] -- register_copy 
     // print_str_at::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [129] if(*((byte*) print_str_at::str#5)!=(byte) '@') goto print_str_at::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [129] if((byte) 0!=*((byte*) print_str_at::str#5)) goto print_str_at::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str_at::@return
     // }

src/test/ref/examples/fastmultiply/fastmultiply8.log

@@ -6,6 +6,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (byte) init_screen::WHITE
 Identified constant variable (signed byte*) ap

src/test/ref/examples/helloworld/helloworld.asm

@@ -49,7 +49,7 @@ print_str: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/examples/helloworld/helloworld.cfg

@@ -35,7 +35,7 @@ print_str: scope:[print_str]  from main
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [15] (byte*) print_char_cursor#10 ← phi( print_str/(byte*) 1024 print_str::@2/(byte*) print_char_cursor#1 )
   [15] (byte*) print_str::str#2 ← phi( print_str/(const string) main::str print_str::@2/(byte*) print_str::str#0 )
-  [16] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2
+  [16] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [17] return 

src/test/ref/examples/helloworld/helloworld.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Culled Empty Block (label) @1
 Culled Empty Block (label) @2
@@ -60,7 +65,7 @@ print_str: scope:[print_str]  from main
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   (byte*) print_char_cursor#17 ← phi( print_str/(byte*) print_char_cursor#21 print_str::@2/(byte*) print_char_cursor#1 )
   (byte*) print_str::str#2 ← phi( print_str/(byte*) print_str::str#4 print_str::@2/(byte*) print_str::str#0 )
-  (bool~) print_str::$0 ← *((byte*) print_str::str#2) != (byte) '@'
+  (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#2)
   if((bool~) print_str::$0) goto print_str::@2
   to:print_str::@return
 print_str::@2: scope:[print_str]  from print_str::@1
@@ -211,13 +216,16 @@ SYMBOL TABLE SSA
 (byte*) print_str::str#3
 (byte*) print_str::str#4
 
+Adding number conversion cast (unumber) 0 in (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#2)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#6 + (number) $28
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) print_screen#0 ← (byte*)(number) $400
 Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (byte*) print_char_cursor#0 = (byte*) print_line_cursor#0 (byte*) print_screen#0 (byte*) print_char_cursor#20 (byte*) print_line_cursor#14 
@@ -244,7 +252,7 @@ Identical Phi Values (byte*) print_char_cursor#14 (byte*) print_line_cursor#1
 Identical Phi Values (byte*) print_char_cursor#16 (byte*) print_char_cursor#14
 Identical Phi Values (byte*) print_line_cursor#11 (byte*) print_line_cursor#10
 Successful SSA optimization Pass2IdenticalPhiElimination
-Simple Condition (bool~) print_str::$0 [6] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2
+Simple Condition (bool~) print_str::$0 [6] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2
 Simple Condition (bool~) print_ln::$1 [19] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#10) goto print_ln::@1
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte*) print_char_cursor#0 = (byte*) 1024
@@ -328,7 +336,7 @@ print_str: scope:[print_str]  from main
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [15] (byte*) print_char_cursor#10 ← phi( print_str/(byte*) 1024 print_str::@2/(byte*) print_char_cursor#1 )
   [15] (byte*) print_str::str#2 ← phi( print_str/(const string) main::str print_str::@2/(byte*) print_str::str#0 )
-  [16] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2
+  [16] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [17] return 
@@ -476,10 +484,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [16] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [16] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -514,7 +522,7 @@ print_str: {
 REGISTER UPLIFT POTENTIAL REGISTERS
 Statement [11] (byte*) print_line_cursor#1 ← (byte*) print_line_cursor#6 + (byte) $28 [ print_line_cursor#1 print_char_cursor#10 ] ( main:2::print_ln:7 [ print_line_cursor#1 print_char_cursor#10 ] ) always clobbers reg byte a 
 Statement [12] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#10) goto print_ln::@1 [ print_line_cursor#1 print_char_cursor#10 ] ( main:2::print_ln:7 [ print_line_cursor#1 print_char_cursor#10 ] ) always clobbers reg byte a 
-Statement [16] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 [ print_char_cursor#10 print_str::str#2 ] ( main:2::print_str:5 [ print_char_cursor#10 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
+Statement [16] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 [ print_char_cursor#10 print_str::str#2 ] ( main:2::print_str:5 [ print_char_cursor#10 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
 Statement [18] *((byte*) print_char_cursor#10) ← *((byte*) print_str::str#2) [ print_char_cursor#10 print_str::str#2 ] ( main:2::print_str:5 [ print_char_cursor#10 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
 Potential registers zp ZP_WORD:2 [ print_line_cursor#6 print_line_cursor#1 ] : zp ZP_WORD:2 , 
 Potential registers zp ZP_WORD:4 [ print_str::str#2 print_str::str#0 ] : zp ZP_WORD:4 , 
@@ -644,10 +652,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [16] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [16] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -845,11 +853,11 @@ print_str: {
     sta str+1
     // print_str::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [16] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [16] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str::@return
     // }

src/test/ref/examples/plasma/plasma-unroll.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 
 Inlined call (byte~) main::$1 ← call toD018 (byte*) SCREEN1 (byte*) CHARSET 

src/test/ref/examples/plasma/plasma.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 
 Inlined call (byte~) main::$4 ← call toD018 (byte*) SCREEN1 (byte*) CHARSET 

src/test/ref/examples/rotate/rotate.log

@@ -5,6 +5,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (byte*) SCREEN
 Identified constant variable (byte*) SPRITE

src/test/ref/examples/scroll/scroll.asm

@@ -39,7 +39,7 @@ main: {
     ldy #0
     lda (nxt),y
     tax
-    cpx #'@'
+    cpx #0
     bne b9
     ldx TEXT
     lda #<TEXT

src/test/ref/examples/scroll/scroll.cfg

@@ -34,7 +34,7 @@ main::@5: scope:[main]  from main::@6
   to:main::@7
 main::@7: scope:[main]  from main::@5
   [16] (byte) main::c#0 ← *((byte*) main::nxt#10)
-  [17] if((byte) main::c#0!=(byte) '@') goto main::@9
+  [17] if((byte) main::c#0!=(byte) 0) goto main::@9
   to:main::@8
 main::@8: scope:[main]  from main::@7
   [18] (byte) main::c#1 ← *((const byte*) TEXT#0)

src/test/ref/examples/scroll/scroll.log

@@ -86,7 +86,7 @@ main::@10: scope:[main]  from main::@8
   (byte) main::scroll#8 ← phi( main::@8/(byte) main::scroll#10 )
   (byte*) main::nxt#3 ← phi( main::@8/(byte*) main::nxt#5 )
   (byte) main::c#0 ← *((byte*) main::nxt#3)
-  (bool~) main::$8 ← (byte) main::c#0 == (byte) '@'
+  (bool~) main::$8 ← (byte) main::c#0 == (number) 0
   (bool~) main::$9 ← ! (bool~) main::$8
   if((bool~) main::$9) goto main::@15
   to:main::@14
@@ -243,6 +243,7 @@ Adding number conversion cast (unumber) 0 in (byte) main::i#0 ← (number) 0
 Adding number conversion cast (unumber) $27 in (bool~) main::$6 ← (byte) main::i#2 != (number) $27
 Adding number conversion cast (unumber) 1 in (number~) main::$7 ← (byte) main::i#3 + (number) 1
 Adding number conversion cast (unumber) main::$7 in (number~) main::$7 ← (byte) main::i#3 + (unumber)(number) 1
+Adding number conversion cast (unumber) 0 in (bool~) main::$8 ← (byte) main::c#0 == (number) 0
 Adding number conversion cast (unumber) $27 in *((byte[]) main::line#0 + (number) $27) ← (byte) main::c#2
 Adding number conversion cast (unumber) $3e8 in (byte*~) fillscreen::$0 ← (byte*) fillscreen::screen#2 + (number) $3e8
 Successful SSA optimization PassNAddNumberTypeConversions
@@ -269,6 +270,7 @@ Simplifying constant integer cast 7
 Simplifying constant integer cast 0
 Simplifying constant integer cast $27
 Simplifying constant integer cast 1
+Simplifying constant integer cast 0
 Simplifying constant integer cast $27
 Simplifying constant integer cast $3e8
 Successful SSA optimization PassNCastSimplification
@@ -282,12 +284,13 @@ Finalized unsigned number type (byte) 7
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $27
 Finalized unsigned number type (byte) 1
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $27
 Finalized unsigned number type (word) $3e8
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Inferred type updated to byte in (unumber~) main::$7 ← (byte) main::i#3 + (byte) 1
 Inversing boolean not [22] (bool~) main::$5 ← (byte) main::scroll#1 != (byte) $ff from [21] (bool~) main::$4 ← (byte) main::scroll#1 == (byte) $ff
-Inversing boolean not [41] (bool~) main::$9 ← (byte) main::c#0 != (byte) '@' from [40] (bool~) main::$8 ← (byte) main::c#0 == (byte) '@'
+Inversing boolean not [41] (bool~) main::$9 ← (byte) main::c#0 != (byte) 0 from [40] (bool~) main::$8 ← (byte) main::c#0 == (byte) 0
 Successful SSA optimization Pass2UnaryNotSimplification
 Alias (byte[]) main::line#0 = (byte*~) main::$1 
 Alias (byte) main::scroll#3 = (byte) main::scroll#5 
@@ -315,7 +318,7 @@ Simple Condition (bool~) main::$2 [14] if(*((byte*) RASTER#0)!=(byte) $fe) goto
 Simple Condition (bool~) main::$3 [17] if(*((byte*) RASTER#0)!=(byte) $ff) goto main::@4
 Simple Condition (bool~) main::$5 [23] if((byte) main::scroll#1!=(byte) $ff) goto main::@7
 Simple Condition (bool~) main::$6 [33] if((byte) main::i#2!=(byte) $27) goto main::@9
-Simple Condition (bool~) main::$9 [42] if((byte) main::c#0!=(byte) '@') goto main::@15
+Simple Condition (bool~) main::$9 [42] if((byte) main::c#0!=(byte) 0) goto main::@15
 Simple Condition (bool~) fillscreen::$1 [55] if((byte*) fillscreen::cursor#2<(byte*~) fillscreen::$0) goto fillscreen::@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte*) SCREEN#0 = (byte*) 1024
@@ -471,7 +474,7 @@ main::@5: scope:[main]  from main::@6
   to:main::@7
 main::@7: scope:[main]  from main::@5
   [16] (byte) main::c#0 ← *((byte*) main::nxt#10)
-  [17] if((byte) main::c#0!=(byte) '@') goto main::@9
+  [17] if((byte) main::c#0!=(byte) 0) goto main::@9
   to:main::@8
 main::@8: scope:[main]  from main::@7
   [18] (byte) main::c#1 ← *((const byte*) TEXT#0)
@@ -668,9 +671,9 @@ main: {
     ldy #0
     lda (nxt),y
     sta c
-    // [17] if((byte) main::c#0!=(byte) '@') goto main::@9 -- vbuz1_neq_vbuc1_then_la1 
+    // [17] if((byte) main::c#0!=(byte) 0) goto main::@9 -- vbuz1_neq_0_then_la1 
-    lda #'@'
+    lda c
-    cmp c
+    cmp #0
     bne b9_from_b7
     jmp b8
     // main::@8
@@ -910,8 +913,8 @@ main: {
     ldy #0
     lda (nxt),y
     tax
-    // [17] if((byte) main::c#0!=(byte) '@') goto main::@9 -- vbuxx_neq_vbuc1_then_la1 
+    // [17] if((byte) main::c#0!=(byte) 0) goto main::@9 -- vbuxx_neq_0_then_la1 
-    cpx #'@'
+    cpx #0
     bne b9_from_b7
     jmp b8
     // main::@8
@@ -1218,9 +1221,9 @@ main: {
     ldy #0
     lda (nxt),y
     tax
-    // if(c=='@')
+    // if(c==0)
-    // [17] if((byte) main::c#0!=(byte) '@') goto main::@9 -- vbuxx_neq_vbuc1_then_la1 
+    // [17] if((byte) main::c#0!=(byte) 0) goto main::@9 -- vbuxx_neq_0_then_la1 
-    cpx #'@'
+    cpx #0
     bne b9
     // main::@8
     // c = *nxt

src/test/ref/examples/scrollbig/scrollbig.asm

@@ -145,7 +145,7 @@ next_char: {
     ldy #0
     lda (nxt),y
     tax
-    cpx #'@'
+    cpx #0
     bne b1
     ldx TEXT
     lda #<TEXT

src/test/ref/examples/scrollbig/scrollbig.cfg

@@ -117,7 +117,7 @@ scroll_hard::@return: scope:[scroll_hard]  from scroll_hard::@1
   to:@return
 next_char: scope:[next_char]  from scroll_bit::@2
   [57] (byte) next_char::c#0 ← *((byte*) nxt#31)
-  [58] if((byte) next_char::c#0!=(byte) '@') goto next_char::@1
+  [58] if((byte) next_char::c#0!=(byte) 0) goto next_char::@1
   to:next_char::@2
 next_char::@2: scope:[next_char]  from next_char
   [59] (byte) next_char::c#1 ← *((const byte*) TEXT#0)

src/test/ref/examples/scrollbig/scrollbig.log

@@ -247,7 +247,7 @@ scroll_bit::@return: scope:[scroll_bit]  from scroll_bit::@6
 next_char: scope:[next_char]  from scroll_bit::@2
   (byte*) nxt#17 ← phi( scroll_bit::@2/(byte*) nxt#24 )
   (byte) next_char::c#0 ← *((byte*) nxt#17)
-  (bool~) next_char::$0 ← (byte) next_char::c#0 == (byte) '@'
+  (bool~) next_char::$0 ← (byte) next_char::c#0 == (number) 0
   (bool~) next_char::$1 ← ! (bool~) next_char::$0
   if((bool~) next_char::$1) goto next_char::@1
   to:next_char::@2
@@ -659,6 +659,7 @@ Adding number conversion cast (unumber) $28 in (byte*~) scroll_bit::$12 ← (byt
 Adding number conversion cast (unumber) $80+' ' in (byte) scroll_bit::b#1 ← (number) $80+(byte) ' '
 Adding number conversion cast (unumber) $80 in (byte) scroll_bit::b#1 ← ((unumber)) (number) $80+(byte) ' '
 Adding number conversion cast (unumber) $37 in *((byte*) PROCPORT#0) ← (number) $37
+Adding number conversion cast (unumber) 0 in (bool~) next_char::$0 ← (byte) next_char::c#0 == (number) 0
 Adding number conversion cast (unumber) 0 in (byte) scroll_hard::i#0 ← (number) 0
 Adding number conversion cast (unumber) $27 in (bool~) scroll_hard::$0 ← (byte) scroll_hard::i#2 != (number) $27
 Adding number conversion cast (unumber) $28*0 in (byte*~) scroll_hard::$1 ← (byte*) SCREEN#0 + (number) $28*(number) 0
@@ -737,6 +738,7 @@ Simplifying constant integer cast (unumber)(number) $80+(byte) ' '
 Simplifying constant integer cast $80
 Simplifying constant integer cast $37
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast $27
 Simplifying constant integer cast 1
 Simplifying constant integer cast 1
@@ -767,6 +769,7 @@ Finalized unsigned number type (byte) $28
 Finalized unsigned number type (byte) $80
 Finalized unsigned number type (byte) $37
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $27
 Finalized unsigned number type (byte) 1
 Finalized unsigned number type (byte) 1
@@ -791,7 +794,7 @@ Inferred type updated to byte in (unumber~) scroll_hard::$24 ← (byte) scroll_h
 Inversing boolean not [38] (bool~) scroll_soft::$1 ← (byte) scroll#3 != (byte) $ff from [37] (bool~) scroll_soft::$0 ← (byte) scroll#3 == (byte) $ff
 Inversing boolean not [62] (bool~) scroll_bit::$2 ← (byte) current_bit#5 != (byte) 0 from [61] (bool~) scroll_bit::$1 ← (byte) current_bit#5 == (byte) 0
 Inversing boolean not [89] (bool~) scroll_bit::$11 ← (byte~) scroll_bit::$9 == (byte) 0 from [88] (bool~) scroll_bit::$10 ← (byte~) scroll_bit::$9 != (byte) 0
-Inversing boolean not [113] (bool~) next_char::$1 ← (byte) next_char::c#0 != (byte) '@' from [112] (bool~) next_char::$0 ← (byte) next_char::c#0 == (byte) '@'
+Inversing boolean not [113] (bool~) next_char::$1 ← (byte) next_char::c#0 != (byte) 0 from [112] (bool~) next_char::$0 ← (byte) next_char::c#0 == (byte) 0
 Successful SSA optimization Pass2UnaryNotSimplification
 Alias (byte) scroll#20 = (byte) scroll#21 
 Alias (byte) current_bit#30 = (byte) current_bit#31 
@@ -899,7 +902,7 @@ Simple Condition (bool~) scroll_soft::$1 [39] if((byte) scroll#3!=(byte) $ff) go
 Simple Condition (bool~) scroll_bit::$2 [63] if((byte) current_bit#5!=(byte) 0) goto scroll_bit::@1
 Simple Condition (bool~) scroll_bit::$11 [90] if((byte~) scroll_bit::$9==(byte) 0) goto scroll_bit::@4
 Simple Condition (bool~) scroll_bit::$13 [97] if((byte) scroll_bit::r#1!=rangelast(0,7)) goto scroll_bit::@3
-Simple Condition (bool~) next_char::$1 [114] if((byte) next_char::c#0!=(byte) '@') goto next_char::@1
+Simple Condition (bool~) next_char::$1 [114] if((byte) next_char::c#0!=(byte) 0) goto next_char::@1
 Simple Condition (bool~) scroll_hard::$0 [127] if((byte) scroll_hard::i#2!=(byte) $27) goto scroll_hard::@2
 Simple Condition (bool~) fillscreen::$1 [168] if((byte*) fillscreen::cursor#2<(byte*~) fillscreen::$0) goto fillscreen::@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
@@ -1258,7 +1261,7 @@ scroll_hard::@return: scope:[scroll_hard]  from scroll_hard::@1
   to:@return
 next_char: scope:[next_char]  from scroll_bit::@2
   [57] (byte) next_char::c#0 ← *((byte*) nxt#31)
-  [58] if((byte) next_char::c#0!=(byte) '@') goto next_char::@1
+  [58] if((byte) next_char::c#0!=(byte) 0) goto next_char::@1
   to:next_char::@2
 next_char::@2: scope:[next_char]  from next_char
   [59] (byte) next_char::c#1 ← *((const byte*) TEXT#0)
@@ -1770,9 +1773,9 @@ next_char: {
     ldy #0
     lda (nxt),y
     sta c
-    // [58] if((byte) next_char::c#0!=(byte) '@') goto next_char::@1 -- vbuz1_neq_vbuc1_then_la1 
+    // [58] if((byte) next_char::c#0!=(byte) 0) goto next_char::@1 -- vbuz1_neq_0_then_la1 
-    lda #'@'
+    lda c
-    cmp c
+    cmp #0
     bne b1_from_next_char
     jmp b2
     // next_char::@2
@@ -2283,8 +2286,8 @@ next_char: {
     ldy #0
     lda (nxt),y
     tax
-    // [58] if((byte) next_char::c#0!=(byte) '@') goto next_char::@1 -- vbuxx_neq_vbuc1_then_la1 
+    // [58] if((byte) next_char::c#0!=(byte) 0) goto next_char::@1 -- vbuxx_neq_0_then_la1 
-    cpx #'@'
+    cpx #0
     bne b1_from_next_char
     jmp b2
     // next_char::@2
@@ -2892,9 +2895,9 @@ next_char: {
     ldy #0
     lda (nxt),y
     tax
-    // if(c=='@')
+    // if(c==0)
-    // [58] if((byte) next_char::c#0!=(byte) '@') goto next_char::@1 -- vbuxx_neq_vbuc1_then_la1 
+    // [58] if((byte) next_char::c#0!=(byte) 0) goto next_char::@1 -- vbuxx_neq_0_then_la1 
-    cpx #'@'
+    cpx #0
     bne b1
     // next_char::@2
     // c = *nxt

src/test/ref/examples/sinsprites/sinus-sprites.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Identified constant variable (byte*) gen_sintab::f_2pi
 Inlined call (byte~) vicSelectGfxBank::$0 ← call toDd00 (byte*) vicSelectGfxBank::gfx 

src/test/ref/fastmultiply-127.asm

@@ -343,7 +343,7 @@ print_str: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/fastmultiply-127.cfg

@@ -294,7 +294,7 @@ print_str: scope:[print_str]  from main::@1 main::@11
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [143] (byte*) print_char_cursor#122 ← phi( print_str/(byte*) print_char_cursor#136 print_str::@2/(byte*) print_char_cursor#1 )
   [143] (byte*) print_str::str#3 ← phi( print_str/(byte*) print_str::str#5 print_str::@2/(byte*) print_str::str#0 )
-  [144] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2
+  [144] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [145] return 

src/test/ref/fastmultiply-127.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Culled Empty Block (label) @1
 Culled Empty Block (label) @2
@@ -113,7 +118,7 @@ print_str: scope:[print_str]  from main::@1 main::@11
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   (byte*) print_char_cursor#122 ← phi( print_str/(byte*) print_char_cursor#136 print_str::@2/(byte*) print_char_cursor#1 )
   (byte*) print_str::str#3 ← phi( print_str/(byte*) print_str::str#5 print_str::@2/(byte*) print_str::str#0 )
-  (bool~) print_str::$0 ← *((byte*) print_str::str#3) != (byte) '@'
+  (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#3)
   if((bool~) print_str::$0) goto print_str::@2
   to:print_str::@return
 print_str::@2: scope:[print_str]  from print_str::@1
@@ -1396,6 +1401,7 @@ SYMBOL TABLE SSA
 (word) print_word::w#3
 
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#3)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#32 + (number) $28
 Adding number conversion cast (snumber) 0 in (bool~) print_sword::$0 ← (signed word) print_sword::w#2 < (number) 0
 Adding number conversion cast (snumber) 0 in (bool~) print_sbyte::$0 ← (signed byte) print_sbyte::b#3 < (number) 0
@@ -1504,6 +1510,7 @@ Inlining cast (signed word~) mulf8s127::$14 ← (signed word)(signed byte) mulf8
 Successful SSA optimization Pass2InlineCast
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
@@ -1560,6 +1567,7 @@ Simplifying constant integer cast 2
 Simplifying constant integer cast $200
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized signed number type (signed byte) 0
 Finalized signed number type (signed byte) 0
@@ -1840,7 +1848,7 @@ Identical Phi Values (byte*) print_char_cursor#130 (byte*) print_char_cursor#19
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) memset::$1 [3] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [13] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str::$0 [26] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2
+Simple Condition (bool~) print_str::$0 [26] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2
 Simple Condition (bool~) print_ln::$1 [39] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#123) goto print_ln::@1
 Simple Condition (bool~) print_sword::$0 [48] if((signed word) print_sword::w#1<(signed byte) 0) goto print_sword::@1
 Simple Condition (bool~) print_sbyte::$0 [72] if((signed byte) print_sbyte::b#3<(signed byte) 0) goto print_sbyte::@1
@@ -2527,7 +2535,7 @@ print_str: scope:[print_str]  from main::@1 main::@11
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [143] (byte*) print_char_cursor#122 ← phi( print_str/(byte*) print_char_cursor#136 print_str::@2/(byte*) print_char_cursor#1 )
   [143] (byte*) print_str::str#3 ← phi( print_str/(byte*) print_str::str#5 print_str::@2/(byte*) print_str::str#0 )
-  [144] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2
+  [144] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [145] return 
@@ -3796,10 +3804,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [144] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [144] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -4063,7 +4071,7 @@ Removing always clobbered register reg byte a as potential for zp ZP_BYTE:21 [ p
 Removing always clobbered register reg byte x as potential for zp ZP_BYTE:21 [ print_mulf8u127::a#8 ]
 Removing always clobbered register reg byte x as potential for zp ZP_BYTE:22 [ print_mulf8u127::b#10 ]
 Statement [140] (word) mulf8u127::return#1 ← *((const word*) mulf8u127::res#0) [ mulf8u127::return#1 ] ( main:2::print_mulf8s127:31::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:33::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:35::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:37::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:39::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:41::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:43::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:45::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:47::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:49::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8u127:11::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:13::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:15::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:17::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:19::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:21::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:23::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:25::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] ) always clobbers reg byte a 
-Statement [144] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2 [ print_char_cursor#122 print_str::str#3 ] ( main:2::print_str:7 [ print_char_cursor#122 print_str::str#3 ] main:2::print_str:27 [ print_line_cursor#1 print_char_cursor#122 print_str::str#3 ] ) always clobbers reg byte a reg byte y 
+Statement [144] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2 [ print_char_cursor#122 print_str::str#3 ] ( main:2::print_str:7 [ print_char_cursor#122 print_str::str#3 ] main:2::print_str:27 [ print_line_cursor#1 print_char_cursor#122 print_str::str#3 ] ) always clobbers reg byte a reg byte y 
 Statement [146] *((byte*) print_char_cursor#122) ← *((byte*) print_str::str#3) [ print_char_cursor#122 print_str::str#3 ] ( main:2::print_str:7 [ print_char_cursor#122 print_str::str#3 ] main:2::print_str:27 [ print_line_cursor#1 print_char_cursor#122 print_str::str#3 ] ) always clobbers reg byte a reg byte y 
 Statement [153] (word) mulf8u127::return#0 ← (word) mulf8u127::return#1 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] ( main:2::print_mulf8u127:11 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:13 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:15 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:17 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:19 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:21 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:23 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:25 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] ) always clobbers reg byte a 
 Statement [154] (word) print_mulf8u127::c#0 ← (word) mulf8u127::return#0 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] ( main:2::print_mulf8u127:11 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:13 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:15 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:17 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:19 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:21 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:23 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:25 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] ) always clobbers reg byte a 
@@ -4099,7 +4107,7 @@ Statement [132] (signed word) mulf8s127::c#3 ← (signed word) mulf8s127::c#7 -
 Statement [135] (signed word~) mulf8s127::c#11 ← (signed word)(word) mulf8s127::c#0 [ mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] ( main:2::print_mulf8s127:31::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:33::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:35::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:37::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:39::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:41::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:43::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:45::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:47::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] main:2::print_mulf8s127:49::mulf8s127:54 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8s127::c#11 ] ) always clobbers reg byte a 
 Statement asm { ldamemA stasm1+1 stasm3+1 eor#$ff stasm2+1 stasm4+1 ldxmemB sec sm1: ldamulf127_sqr1_lo,x sm2: sbcmulf127_sqr2_lo,x staresL sm3: ldamulf127_sqr1_hi,x sm4: sbcmulf127_sqr2_hi,x staresH  } always clobbers reg byte a reg byte x 
 Statement [140] (word) mulf8u127::return#1 ← *((const word*) mulf8u127::res#0) [ mulf8u127::return#1 ] ( main:2::print_mulf8s127:31::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:33::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:35::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:37::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:39::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:41::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:43::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:45::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:47::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8s127:49::mulf8s127:54::mulf8u127:117 [ print_line_cursor#1 print_mulf8s127::a#10 print_mulf8s127::b#10 mulf8s127::a#0 mulf8s127::b#0 mulf8u127::return#1 ] main:2::print_mulf8u127:11::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:13::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:15::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:17::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:19::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:21::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:23::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] main:2::print_mulf8u127:25::mulf8u127:152 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#1 ] ) always clobbers reg byte a 
-Statement [144] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2 [ print_char_cursor#122 print_str::str#3 ] ( main:2::print_str:7 [ print_char_cursor#122 print_str::str#3 ] main:2::print_str:27 [ print_line_cursor#1 print_char_cursor#122 print_str::str#3 ] ) always clobbers reg byte a reg byte y 
+Statement [144] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2 [ print_char_cursor#122 print_str::str#3 ] ( main:2::print_str:7 [ print_char_cursor#122 print_str::str#3 ] main:2::print_str:27 [ print_line_cursor#1 print_char_cursor#122 print_str::str#3 ] ) always clobbers reg byte a reg byte y 
 Statement [146] *((byte*) print_char_cursor#122) ← *((byte*) print_str::str#3) [ print_char_cursor#122 print_str::str#3 ] ( main:2::print_str:7 [ print_char_cursor#122 print_str::str#3 ] main:2::print_str:27 [ print_line_cursor#1 print_char_cursor#122 print_str::str#3 ] ) always clobbers reg byte a reg byte y 
 Statement [153] (word) mulf8u127::return#0 ← (word) mulf8u127::return#1 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] ( main:2::print_mulf8u127:11 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:13 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:15 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:17 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:19 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:21 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:23 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] main:2::print_mulf8u127:25 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 mulf8u127::return#0 ] ) always clobbers reg byte a 
 Statement [154] (word) print_mulf8u127::c#0 ← (word) mulf8u127::return#0 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] ( main:2::print_mulf8u127:11 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:13 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:15 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:17 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:19 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:21 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:23 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] main:2::print_mulf8u127:25 [ print_line_cursor#1 print_mulf8u127::a#8 print_mulf8u127::b#10 print_mulf8u127::c#0 ] ) always clobbers reg byte a 
@@ -5081,10 +5089,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [144] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [144] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -6558,11 +6566,11 @@ print_str: {
     // [143] phi (byte*) print_str::str#3 = (byte*) print_str::str#5 [phi:print_str/print_str::@2->print_str::@1#1] -- register_copy 
     // print_str::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [144] if(*((byte*) print_str::str#3)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [144] if((byte) 0!=*((byte*) print_str::str#3)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str::@return
     // }

src/test/ref/function-pointer-noarg-call-10.asm

@@ -59,7 +59,7 @@ print: {
     inc idx
     iny
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1
     rts
 }

src/test/ref/function-pointer-noarg-call-10.cfg

@@ -49,7 +49,7 @@ print::@1: scope:[print]  from print print::@1
   [21] *((const byte*) SCREEN#0 + (byte) idx#11) ← *((byte*) print::msg#3 + (byte) print::i#2)
   [22] (byte) idx#12 ← ++ (byte) idx#11
   [23] (byte) print::i#1 ← ++ (byte) print::i#2
-  [24] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1
+  [24] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1
   to:print::@return
 print::@return: scope:[print]  from print::@1
   [25] return 

src/test/ref/function-pointer-noarg-call-10.log

@@ -1,5 +1,6 @@
 Resolved forward reference hello to (void()) hello()
 Resolved forward reference world to (void()) world()
+Warning! Adding boolean cast to non-boolean condition *((byte*) print::msg + (byte) print::i)
 Culled Empty Block (label) @1
 Culled Empty Block (label) do10::@2
 Culled Empty Block (label) @2
@@ -83,7 +84,7 @@ print::@1: scope:[print]  from print print::@1
   *((byte*) SCREEN#0 + (byte) idx#11) ← *((byte*) print::msg#2 + (byte) print::i#2)
   (byte) idx#5 ← ++ (byte) idx#11
   (byte) print::i#1 ← ++ (byte) print::i#2
-  (bool~) print::$0 ← *((byte*) print::msg#2 + (byte) print::i#1) != (byte) '@'
+  (bool~) print::$0 ← (number) 0 != *((byte*) print::msg#2 + (byte) print::i#1)
   if((bool~) print::$0) goto print::@1
   to:print::@return
 print::@return: scope:[print]  from print::@1
@@ -168,6 +169,7 @@ SYMBOL TABLE SSA
 
 Adding number conversion cast (unumber) 0 in (byte) idx#4 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) print::i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print::$0 ← (number) 0 != *((byte*) print::msg#2 + (byte) print::i#1)
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) SCREEN#0 ← (byte*)(number) $400
 Inlining cast (byte) idx#4 ← (unumber)(number) 0
@@ -176,9 +178,11 @@ Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (void()*) do10::fn#0 = (void()*~) main::$0 
 Alias (void()*) do10::fn#1 = (void()*~) main::$2 
@@ -197,7 +201,7 @@ Successful SSA optimization Pass2IdenticalPhiElimination
 Identical Phi Values (byte) idx#15 (byte) idx#16
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) do10::$1 [13] if((byte) do10::i#1!=rangelast(0,9)) goto do10::@1
-Simple Condition (bool~) print::$0 [40] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1
+Simple Condition (bool~) print::$0 [40] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant right-side identified [0] (void()*) do10::fn#0 ← & (void()) hello()
 Constant right-side identified [3] (void()*) do10::fn#1 ← & (void()) world()
@@ -324,7 +328,7 @@ print::@1: scope:[print]  from print print::@1
   [21] *((const byte*) SCREEN#0 + (byte) idx#11) ← *((byte*) print::msg#3 + (byte) print::i#2)
   [22] (byte) idx#12 ← ++ (byte) idx#11
   [23] (byte) print::i#1 ← ++ (byte) print::i#2
-  [24] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1
+  [24] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1
   to:print::@return
 print::@return: scope:[print]  from print::@1
   [25] return 
@@ -522,10 +526,10 @@ print: {
     inc idx
     // [23] (byte) print::i#1 ← ++ (byte) print::i#2 -- vbuz1=_inc_vbuz1 
     inc i
-    // [24] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1 -- pbuz1_derefidx_vbuz2_neq_vbuc1_then_la1 
+    // [24] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1 -- vbuc1_neq_pbuz1_derefidx_vbuz2_then_la1 
     ldy i
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1_from_b1
     jmp breturn
     // print::@return
@@ -564,12 +568,12 @@ Statement [14] if((byte) do10::i#1!=(byte) $a) goto do10::@1 [ do10::fn#3 do10::
 Statement [21] *((const byte*) SCREEN#0 + (byte) idx#11) ← *((byte*) print::msg#3 + (byte) print::i#2) [ print::msg#3 print::i#2 idx#11 ] ( print:17 [ print::msg#3 print::i#2 idx#11 ] print:27 [ print::msg#3 print::i#2 idx#11 ] ) always clobbers reg byte a reg byte x 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:7 [ print::i#2 print::i#1 ]
 Removing always clobbered register reg byte x as potential for zp ZP_BYTE:7 [ print::i#2 print::i#1 ]
-Statement [24] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1 [ print::msg#3 print::i#1 idx#12 ] ( print:17 [ print::msg#3 print::i#1 idx#12 ] print:27 [ print::msg#3 print::i#1 idx#12 ] ) always clobbers reg byte a 
+Statement [24] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1 [ print::msg#3 print::i#1 idx#12 ] ( print:17 [ print::msg#3 print::i#1 idx#12 ] print:27 [ print::msg#3 print::i#1 idx#12 ] ) always clobbers reg byte a 
 Statement [1] (byte) idx#16 ← (byte) 0 [ ] (  [ ] ) always clobbers reg byte a 
 Statement [12] call *((void()*) do10::fn#3)  [ do10::fn#3 do10::i#2 ] ( main:3::do10:6 [ do10::fn#3 do10::i#2 ] main:3::do10:8 [ do10::fn#3 do10::i#2 ] ) always clobbers reg byte a reg byte x reg byte y 
 Statement [14] if((byte) do10::i#1!=(byte) $a) goto do10::@1 [ do10::fn#3 do10::i#1 ] ( main:3::do10:6 [ do10::fn#3 do10::i#1 ] main:3::do10:8 [ do10::fn#3 do10::i#1 ] ) always clobbers reg byte a 
 Statement [21] *((const byte*) SCREEN#0 + (byte) idx#11) ← *((byte*) print::msg#3 + (byte) print::i#2) [ print::msg#3 print::i#2 idx#11 ] ( print:17 [ print::msg#3 print::i#2 idx#11 ] print:27 [ print::msg#3 print::i#2 idx#11 ] ) always clobbers reg byte a reg byte x 
-Statement [24] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1 [ print::msg#3 print::i#1 idx#12 ] ( print:17 [ print::msg#3 print::i#1 idx#12 ] print:27 [ print::msg#3 print::i#1 idx#12 ] ) always clobbers reg byte a 
+Statement [24] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1 [ print::msg#3 print::i#1 idx#12 ] ( print:17 [ print::msg#3 print::i#1 idx#12 ] print:27 [ print::msg#3 print::i#1 idx#12 ] ) always clobbers reg byte a 
 Potential registers zp ZP_WORD:2 [ do10::fn#3 ] : zp ZP_WORD:2 , 
 Potential registers zp ZP_BYTE:4 [ do10::i#2 do10::i#1 ] : zp ZP_BYTE:4 , 
 Potential registers zp ZP_WORD:5 [ print::msg#3 ] : zp ZP_WORD:5 , 
@@ -736,9 +740,9 @@ print: {
     inc idx
     // [23] (byte) print::i#1 ← ++ (byte) print::i#2 -- vbuyy=_inc_vbuyy 
     iny
-    // [24] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1 -- pbuz1_derefidx_vbuyy_neq_vbuc1_then_la1 
+    // [24] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1 -- vbuc1_neq_pbuz1_derefidx_vbuyy_then_la1 
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1_from_b1
     jmp breturn
     // print::@return
@@ -980,10 +984,10 @@ print: {
     inc idx
     // [23] (byte) print::i#1 ← ++ (byte) print::i#2 -- vbuyy=_inc_vbuyy 
     iny
-    // while(msg[i]!='@')
+    // while(msg[i])
-    // [24] if(*((byte*) print::msg#3 + (byte) print::i#1)!=(byte) '@') goto print::@1 -- pbuz1_derefidx_vbuyy_neq_vbuc1_then_la1 
+    // [24] if((byte) 0!=*((byte*) print::msg#3 + (byte) print::i#1)) goto print::@1 -- vbuc1_neq_pbuz1_derefidx_vbuyy_then_la1 
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1
     // print::@return
     // }

src/test/ref/function-pointer-noarg-call-7.asm

@@ -33,8 +33,10 @@ hello: {
     sta SCREEN,y
     inc idx
     inx
-    lda msg,x
+    txa
-    cmp #'@'
+    tay
+    lda #0
+    cmp msg,y
     bne b1
     rts
 }

src/test/ref/function-pointer-noarg-call-7.cfg

@@ -38,7 +38,7 @@ hello::@1: scope:[hello]  from hello hello::@1
   [16] *((const byte*) SCREEN#0 + (byte) idx#3) ← *((const byte[]) msg#0 + (byte) hello::i#2)
   [17] (byte) idx#1 ← ++ (byte) idx#3
   [18] (byte) hello::i#1 ← ++ (byte) hello::i#2
-  [19] if(*((const byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1
+  [19] if((byte) 0!=*((const byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1
   to:hello::@return
 hello::@return: scope:[hello]  from hello::@1
   [20] return 

src/test/ref/function-pointer-noarg-call-7.log

@@ -1,4 +1,5 @@
 Resolved forward reference hello to (void()) hello()
+Warning! Adding boolean cast to non-boolean condition *((byte[]) msg + (byte) hello::i)
 Culled Empty Block (label) @1
 Culled Empty Block (label) do10::@2
 Culled Empty Block (label) hello::@2
@@ -47,7 +48,7 @@ hello::@1: scope:[hello]  from hello hello::@1
   *((byte*) SCREEN#0 + (byte) idx#3) ← *((byte[]) msg#0 + (byte) hello::i#2)
   (byte) idx#1 ← ++ (byte) idx#3
   (byte) hello::i#1 ← ++ (byte) hello::i#2
-  (bool~) hello::$0 ← *((byte[]) msg#0 + (byte) hello::i#1) != (byte) '@'
+  (bool~) hello::$0 ← (number) 0 != *((byte[]) msg#0 + (byte) hello::i#1)
   if((bool~) hello::$0) goto hello::@1
   to:hello::@return
 hello::@return: scope:[hello]  from hello::@1
@@ -111,6 +112,7 @@ SYMBOL TABLE SSA
 
 Adding number conversion cast (unumber) 0 in (byte) idx#0 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) hello::i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) hello::$0 ← (number) 0 != *((byte[]) msg#0 + (byte) hello::i#1)
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) SCREEN#0 ← (byte*)(number) $400
 Inlining cast (byte) idx#0 ← (unumber)(number) 0
@@ -119,9 +121,11 @@ Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (void()*) main::f#0 = (void()*~) main::$0 
 Alias (byte) idx#1 = (byte) idx#4 (byte) idx#2 
@@ -132,7 +136,7 @@ Identical Phi Values (void()*) do10::fn#1 (void()*) do10::fn#2
 Identical Phi Values (byte) idx#5 (byte) idx#0
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) do10::$1 [11] if((byte) do10::i#1!=rangelast(0,9)) goto do10::@1
-Simple Condition (bool~) hello::$0 [23] if(*((byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1
+Simple Condition (bool~) hello::$0 [23] if((byte) 0!=*((byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant right-side identified [0] (void()*) main::f#0 ← & (void()) hello()
 Successful SSA optimization Pass2ConstantRValueConsolidation
@@ -237,7 +241,7 @@ hello::@1: scope:[hello]  from hello hello::@1
   [16] *((const byte*) SCREEN#0 + (byte) idx#3) ← *((const byte[]) msg#0 + (byte) hello::i#2)
   [17] (byte) idx#1 ← ++ (byte) idx#3
   [18] (byte) hello::i#1 ← ++ (byte) hello::i#2
-  [19] if(*((const byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1
+  [19] if((byte) 0!=*((const byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1
   to:hello::@return
 hello::@return: scope:[hello]  from hello::@1
   [20] return 
@@ -378,8 +382,8 @@ hello: {
     inc idx
     // [18] (byte) hello::i#1 ← ++ (byte) hello::i#2 -- vbuz1=_inc_vbuz1 
     inc i
-    // [19] if(*((const byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 -- pbuc1_derefidx_vbuz1_neq_vbuc2_then_la1 
+    // [19] if((byte) 0!=*((const byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     ldy i
     cmp msg,y
     bne b1_from_b1
@@ -400,10 +404,10 @@ Removing always clobbered register reg byte a as potential for zp ZP_BYTE:2 [ do
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:3 [ hello::i#2 hello::i#1 ]
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:3 [ hello::i#2 hello::i#1 ]
-Statement [19] if(*((const byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 [ idx#0 hello::i#1 idx#1 ] ( main:3::do10:6::hello:10 [ do10::i#2 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a 
+Statement [19] if((byte) 0!=*((const byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1 [ idx#0 hello::i#1 idx#1 ] ( main:3::do10:6::hello:10 [ do10::i#2 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a reg byte y 
 Statement [1] (byte) idx#0 ← (byte) 0 [ idx#0 ] (  [ idx#0 ] ) always clobbers reg byte a 
 Statement [16] *((const byte*) SCREEN#0 + (byte) idx#3) ← *((const byte[]) msg#0 + (byte) hello::i#2) [ idx#0 hello::i#2 idx#3 ] ( main:3::do10:6::hello:10 [ do10::i#2 idx#0 hello::i#2 idx#3 ] ) always clobbers reg byte a reg byte y 
-Statement [19] if(*((const byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 [ idx#0 hello::i#1 idx#1 ] ( main:3::do10:6::hello:10 [ do10::i#2 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a 
+Statement [19] if((byte) 0!=*((const byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1 [ idx#0 hello::i#1 idx#1 ] ( main:3::do10:6::hello:10 [ do10::i#2 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a reg byte y 
 Potential registers zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ] : zp ZP_BYTE:2 , reg byte x , 
 Potential registers zp ZP_BYTE:3 [ hello::i#2 hello::i#1 ] : zp ZP_BYTE:3 , reg byte x , 
 Potential registers zp ZP_BYTE:4 [ idx#0 idx#3 idx#7 idx#1 ] : zp ZP_BYTE:4 , 
@@ -414,14 +418,14 @@ Uplift Scope [] 224.1: zp ZP_BYTE:4 [ idx#0 idx#3 idx#7 idx#1 ]
 Uplift Scope [do10] 27.5: zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ] 
 Uplift Scope [main] 
 
-Uplifting [hello] best 4349 combination reg byte x [ hello::i#2 hello::i#1 ] 
+Uplifting [hello] best 4749 combination reg byte x [ hello::i#2 hello::i#1 ] 
-Uplifting [] best 4349 combination zp ZP_BYTE:4 [ idx#0 idx#3 idx#7 idx#1 ] 
+Uplifting [] best 4749 combination zp ZP_BYTE:4 [ idx#0 idx#3 idx#7 idx#1 ] 
-Uplifting [do10] best 4349 combination zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ] 
+Uplifting [do10] best 4749 combination zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ] 
-Uplifting [main] best 4349 combination 
+Uplifting [main] best 4749 combination 
 Attempting to uplift remaining variables inzp ZP_BYTE:4 [ idx#0 idx#3 idx#7 idx#1 ]
-Uplifting [] best 4349 combination zp ZP_BYTE:4 [ idx#0 idx#3 idx#7 idx#1 ] 
+Uplifting [] best 4749 combination zp ZP_BYTE:4 [ idx#0 idx#3 idx#7 idx#1 ] 
 Attempting to uplift remaining variables inzp ZP_BYTE:2 [ do10::i#2 do10::i#1 ]
-Uplifting [do10] best 4349 combination zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ] 
+Uplifting [do10] best 4749 combination zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ] 
 Allocated (was zp ZP_BYTE:4) zp ZP_BYTE:3 [ idx#0 idx#3 idx#7 idx#1 ]
 
 ASSEMBLER BEFORE OPTIMIZATION
@@ -521,9 +525,11 @@ hello: {
     inc idx
     // [18] (byte) hello::i#1 ← ++ (byte) hello::i#2 -- vbuxx=_inc_vbuxx 
     inx
-    // [19] if(*((const byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 -- pbuc1_derefidx_vbuxx_neq_vbuc2_then_la1 
+    // [19] if((byte) 0!=*((const byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1 
-    lda msg,x
+    txa
-    cmp #'@'
+    tay
+    lda #0
+    cmp msg,y
     bne b1_from_b1
     jmp breturn
     // hello::@return
@@ -606,7 +612,7 @@ zp ZP_BYTE:3 [ idx#0 idx#3 idx#7 idx#1 ]
 
 
 FINAL ASSEMBLER
-Score: 3326
+Score: 3726
 
   // File Comments
 // Tests calling into a function pointer with local variables
@@ -691,10 +697,12 @@ hello: {
     inc idx
     // [18] (byte) hello::i#1 ← ++ (byte) hello::i#2 -- vbuxx=_inc_vbuxx 
     inx
-    // while(msg[i]!='@')
+    // while(msg[i])
-    // [19] if(*((const byte[]) msg#0 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 -- pbuc1_derefidx_vbuxx_neq_vbuc2_then_la1 
+    // [19] if((byte) 0!=*((const byte[]) msg#0 + (byte) hello::i#1)) goto hello::@1 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1 
-    lda msg,x
+    txa
-    cmp #'@'
+    tay
+    lda #0
+    cmp msg,y
     bne b1
     // hello::@return
     // }

src/test/ref/function-pointer-noarg-call-8.asm

@@ -46,7 +46,7 @@ hello: {
     inc idx
     iny
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1
     rts
 }

src/test/ref/function-pointer-noarg-call-8.cfg

@@ -43,7 +43,7 @@ hello::@1: scope:[hello]  from hello hello::@1
   [19] *((const byte*) SCREEN#0 + (byte) idx#3) ← *((byte*) msg#10 + (byte) hello::i#2)
   [20] (byte) idx#1 ← ++ (byte) idx#3
   [21] (byte) hello::i#1 ← ++ (byte) hello::i#2
-  [22] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1
+  [22] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1
   to:hello::@return
 hello::@return: scope:[hello]  from hello::@1
   [23] return 

src/test/ref/function-pointer-noarg-call-8.log

@@ -3,6 +3,7 @@ Resolved forward reference msg1 to (byte[]) msg1
 Resolved forward reference msg to (byte*) msg
 Resolved forward reference msg2 to (byte[]) msg2
 Resolved forward reference msg to (byte*) msg
+Warning! Adding boolean cast to non-boolean condition *((byte*) msg + (byte) hello::i)
 Culled Empty Block (label) @1
 Culled Empty Block (label) do10::@2
 Culled Empty Block (label) hello::@2
@@ -65,7 +66,7 @@ hello::@1: scope:[hello]  from hello hello::@1
   *((byte*) SCREEN#0 + (byte) idx#3) ← *((byte*) msg#6 + (byte) hello::i#2)
   (byte) idx#1 ← ++ (byte) idx#3
   (byte) hello::i#1 ← ++ (byte) hello::i#2
-  (bool~) hello::$0 ← *((byte*) msg#6 + (byte) hello::i#1) != (byte) '@'
+  (bool~) hello::$0 ← (number) 0 != *((byte*) msg#6 + (byte) hello::i#1)
   if((bool~) hello::$0) goto hello::@1
   to:hello::@return
 hello::@return: scope:[hello]  from hello::@1
@@ -150,6 +151,7 @@ SYMBOL TABLE SSA
 
 Adding number conversion cast (unumber) 0 in (byte) idx#0 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) hello::i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) hello::$0 ← (number) 0 != *((byte*) msg#6 + (byte) hello::i#1)
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) SCREEN#0 ← (byte*)(number) $400
 Inlining cast (byte) idx#0 ← (unumber)(number) 0
@@ -158,9 +160,11 @@ Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (void()*) main::f#0 = (void()*~) main::$0 (void()*) main::f#1 
 Alias (byte*) msg#1 = (byte*) msg#8 (byte*) msg#5 (byte*) msg#2 
@@ -176,7 +180,7 @@ Identical Phi Values (byte*) msg#6 (byte*) msg#9
 Identical Phi Values (byte*) msg#4 (byte*) msg#1
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) do10::$1 [19] if((byte) do10::i#1!=rangelast(0,9)) goto do10::@1
-Simple Condition (bool~) hello::$0 [33] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1
+Simple Condition (bool~) hello::$0 [33] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant right-side identified [0] (void()*) main::f#0 ← & (void()) hello()
 Successful SSA optimization Pass2ConstantRValueConsolidation
@@ -291,7 +295,7 @@ hello::@1: scope:[hello]  from hello hello::@1
   [19] *((const byte*) SCREEN#0 + (byte) idx#3) ← *((byte*) msg#10 + (byte) hello::i#2)
   [20] (byte) idx#1 ← ++ (byte) idx#3
   [21] (byte) hello::i#1 ← ++ (byte) hello::i#2
-  [22] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1
+  [22] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1
   to:hello::@return
 hello::@return: scope:[hello]  from hello::@1
   [23] return 
@@ -462,10 +466,10 @@ hello: {
     inc idx
     // [21] (byte) hello::i#1 ← ++ (byte) hello::i#2 -- vbuz1=_inc_vbuz1 
     inc i
-    // [22] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 -- pbuz1_derefidx_vbuz2_neq_vbuc1_then_la1 
+    // [22] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1 -- vbuc1_neq_pbuz1_derefidx_vbuz2_then_la1 
     ldy i
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1_from_b1
     jmp breturn
     // hello::@return
@@ -489,13 +493,13 @@ Removing always clobbered register reg byte a as potential for zp ZP_BYTE:2 [ do
 Removing always clobbered register reg byte x as potential for zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:3 [ hello::i#2 hello::i#1 ]
 Removing always clobbered register reg byte x as potential for zp ZP_BYTE:3 [ hello::i#2 hello::i#1 ]
-Statement [22] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 [ msg#10 idx#0 hello::i#1 idx#1 ] ( main:4::do10:7::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] main:4::do10:9::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a 
+Statement [22] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1 [ msg#10 idx#0 hello::i#1 idx#1 ] ( main:4::do10:7::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] main:4::do10:9::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a 
 Statement [1] (byte*) msg#10 ← (byte*) 0 [ msg#10 ] (  [ msg#10 ] ) always clobbers reg byte a 
 Statement [2] (byte) idx#0 ← (byte) 0 [ msg#10 idx#0 ] (  [ msg#10 idx#0 ] ) always clobbers reg byte a 
 Statement [6] (byte*) msg#0 ← (const byte[]) msg1#0 [ msg#10 idx#0 ] ( main:4 [ msg#10 idx#0 ] ) always clobbers reg byte a 
 Statement [8] (byte*) msg#1 ← (const byte[]) msg2#0 [ msg#10 idx#0 ] ( main:4 [ msg#10 idx#0 ] ) always clobbers reg byte a 
 Statement [19] *((const byte*) SCREEN#0 + (byte) idx#3) ← *((byte*) msg#10 + (byte) hello::i#2) [ msg#10 idx#0 hello::i#2 idx#3 ] ( main:4::do10:7::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#2 idx#3 ] main:4::do10:9::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#2 idx#3 ] ) always clobbers reg byte a reg byte x 
-Statement [22] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 [ msg#10 idx#0 hello::i#1 idx#1 ] ( main:4::do10:7::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] main:4::do10:9::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a 
+Statement [22] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1 [ msg#10 idx#0 hello::i#1 idx#1 ] ( main:4::do10:7::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] main:4::do10:9::hello:13 [ do10::i#2 msg#10 idx#0 hello::i#1 idx#1 ] ) always clobbers reg byte a 
 Potential registers zp ZP_BYTE:2 [ do10::i#2 do10::i#1 ] : zp ZP_BYTE:2 , reg byte y , 
 Potential registers zp ZP_BYTE:3 [ hello::i#2 hello::i#1 ] : zp ZP_BYTE:3 , reg byte y , 
 Potential registers zp ZP_WORD:4 [ msg#0 msg#1 msg#10 ] : zp ZP_WORD:4 , 
@@ -636,9 +640,9 @@ hello: {
     inc idx
     // [21] (byte) hello::i#1 ← ++ (byte) hello::i#2 -- vbuyy=_inc_vbuyy 
     iny
-    // [22] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 -- pbuz1_derefidx_vbuyy_neq_vbuc1_then_la1 
+    // [22] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1 -- vbuc1_neq_pbuz1_derefidx_vbuyy_then_la1 
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1_from_b1
     jmp breturn
     // hello::@return
@@ -842,10 +846,10 @@ hello: {
     inc idx
     // [21] (byte) hello::i#1 ← ++ (byte) hello::i#2 -- vbuyy=_inc_vbuyy 
     iny
-    // while(msg[i]!='@')
+    // while(msg[i])
-    // [22] if(*((byte*) msg#10 + (byte) hello::i#1)!=(byte) '@') goto hello::@1 -- pbuz1_derefidx_vbuyy_neq_vbuc1_then_la1 
+    // [22] if((byte) 0!=*((byte*) msg#10 + (byte) hello::i#1)) goto hello::@1 -- vbuc1_neq_pbuz1_derefidx_vbuyy_then_la1 
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b1
     // hello::@return
     // }

src/test/ref/helloworld2-inline.asm

@@ -7,13 +7,13 @@ main: {
     ldx #0
     ldy #0
   print21_b1:
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print21_b2
-    ldx #0
+    tax
-    ldy #0
+    tay
   print22_b1:
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print22_b2
     rts

src/test/ref/helloworld2-inline.cfg

@@ -16,7 +16,7 @@ main::print21: scope:[main]  from main
 main::print21_@1: scope:[main]  from main::print21 main::print21_@2
   [6] (byte) main::print21_j#2 ← phi( main::print21/(byte) 0 main::print21_@2/(byte) main::print21_j#1 )
   [6] (byte) main::print21_i#2 ← phi( main::print21/(byte) 0 main::print21_@2/(byte) main::print21_i#1 )
-  [7] if(*((const byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2
+  [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2
   to:main::print22
 main::print22: scope:[main]  from main::print21_@1
   [8] phi()
@@ -24,7 +24,7 @@ main::print22: scope:[main]  from main::print21_@1
 main::print22_@1: scope:[main]  from main::print22 main::print22_@2
   [9] (byte) main::print22_j#2 ← phi( main::print22/(byte) 0 main::print22_@2/(byte) main::print22_j#1 )
   [9] (byte) main::print22_i#2 ← phi( main::print22/(byte) 0 main::print22_@2/(byte) main::print22_i#1 )
-  [10] if(*((const byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2
+  [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2
   to:main::@return
 main::@return: scope:[main]  from main::print22_@1
   [11] return 

src/test/ref/helloworld2-inline.log

@@ -1,3 +1,4 @@
+Warning! Adding boolean cast to non-boolean condition *((byte*) print2::msg + (byte) print2::i)
 Identified constant variable (byte*) screen
 Identified constant variable (byte*) main::hello
 Inlined call call print2 (byte*) screen (byte*) main::hello 
@@ -35,7 +36,7 @@ main::print21_@1: scope:[main]  from main::print21 main::print21_@2
   (byte*) main::print21_at#2 ← phi( main::print21/(byte*) main::print21_at#3 main::print21_@2/(byte*) main::print21_at#1 )
   (byte) main::print21_i#2 ← phi( main::print21/(byte) main::print21_i#0 main::print21_@2/(byte) main::print21_i#1 )
   (byte*) main::print21_msg#1 ← phi( main::print21/(byte*) main::print21_msg#3 main::print21_@2/(byte*) main::print21_msg#2 )
-  (bool~) main::print21_$0#0 ← *((byte*) main::print21_msg#1 + (byte) main::print21_i#2) != (byte) '@'
+  (bool~) main::print21_$0#0 ← (number) 0 != *((byte*) main::print21_msg#1 + (byte) main::print21_i#2)
   if((bool~) main::print21_$0#0) goto main::print21_@2
   to:main::@1
 main::print21_@2: scope:[main]  from main::print21_@1
@@ -63,7 +64,7 @@ main::print22_@1: scope:[main]  from main::print22 main::print22_@2
   (byte*) main::print22_at#2 ← phi( main::print22/(byte*) main::print22_at#3 main::print22_@2/(byte*) main::print22_at#1 )
   (byte) main::print22_i#2 ← phi( main::print22/(byte) main::print22_i#0 main::print22_@2/(byte) main::print22_i#1 )
   (byte*) main::print22_msg#1 ← phi( main::print22/(byte*) main::print22_msg#3 main::print22_@2/(byte*) main::print22_msg#2 )
-  (bool~) main::print22_$0#0 ← *((byte*) main::print22_msg#1 + (byte) main::print22_i#2) != (byte) '@'
+  (bool~) main::print22_$0#0 ← (number) 0 != *((byte*) main::print22_msg#1 + (byte) main::print22_i#2)
   if((bool~) main::print22_$0#0) goto main::print22_@2
   to:main::@return
 main::print22_@2: scope:[main]  from main::print22_@1
@@ -152,10 +153,12 @@ SYMBOL TABLE SSA
 
 Adding number conversion cast (unumber) 0 in (byte) main::print21_j#0 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) main::print21_i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) main::print21_$0#0 ← (number) 0 != *((byte*) main::print21_msg#1 + (byte) main::print21_i#2)
 Adding number conversion cast (unumber) 2 in (byte) main::print21_j#1 ← (byte) main::print21_j#2 + (number) 2
 Adding number conversion cast (unumber) $50 in (byte*~) main::$1 ← (byte*) screen#0 + (number) $50
 Adding number conversion cast (unumber) 0 in (byte) main::print22_j#0 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) main::print22_i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) main::print22_$0#0 ← (number) 0 != *((byte*) main::print22_msg#1 + (byte) main::print22_i#2)
 Adding number conversion cast (unumber) 2 in (byte) main::print22_j#1 ← (byte) main::print22_j#2 + (number) 2
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) screen#0 ← (byte*)(number) $400
@@ -167,18 +170,22 @@ Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast 2
 Simplifying constant integer cast $50
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast 2
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 2
 Finalized unsigned number type (byte) $50
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 2
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (byte*) main::hello#0 = (byte*) main::print21_msg#0 (byte*) main::print21_msg#3 (byte*) main::print22_msg#0 (byte*) main::print22_msg#3 
@@ -198,8 +205,8 @@ Identical Phi Values (byte*) main::print21_at#1 (byte*) main::print21_at#0
 Identical Phi Values (byte*) main::print22_msg#1 (byte*) main::hello#0
 Identical Phi Values (byte*) main::print22_at#1 (byte*) main::print22_at#0
 Successful SSA optimization Pass2IdenticalPhiElimination
-Simple Condition (bool~) main::print21_$0#0 [9] if(*((byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2
+Simple Condition (bool~) main::print21_$0#0 [9] if((byte) 0!=*((byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2
-Simple Condition (bool~) main::print22_$0#0 [22] if(*((byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2
+Simple Condition (bool~) main::print22_$0#0 [22] if((byte) 0!=*((byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte*) screen#0 = (byte*) 1024
 Constant (const byte*) main::hello#0 = main::$3
@@ -271,7 +278,7 @@ main::print21: scope:[main]  from main
 main::print21_@1: scope:[main]  from main::print21 main::print21_@2
   [6] (byte) main::print21_j#2 ← phi( main::print21/(byte) 0 main::print21_@2/(byte) main::print21_j#1 )
   [6] (byte) main::print21_i#2 ← phi( main::print21/(byte) 0 main::print21_@2/(byte) main::print21_i#1 )
-  [7] if(*((const byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2
+  [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2
   to:main::print22
 main::print22: scope:[main]  from main::print21_@1
   [8] phi()
@@ -279,7 +286,7 @@ main::print22: scope:[main]  from main::print21_@1
 main::print22_@1: scope:[main]  from main::print22 main::print22_@2
   [9] (byte) main::print22_j#2 ← phi( main::print22/(byte) 0 main::print22_@2/(byte) main::print22_j#1 )
   [9] (byte) main::print22_i#2 ← phi( main::print22/(byte) 0 main::print22_@2/(byte) main::print22_i#1 )
-  [10] if(*((const byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2
+  [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2
   to:main::@return
 main::@return: scope:[main]  from main::print22_@1
   [11] return 
@@ -382,8 +389,8 @@ main: {
     jmp print21_b1
     // main::print21_@1
   print21_b1:
-    // [7] if(*((const byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2 -- pbuc1_derefidx_vbuz1_neq_vbuc2_then_la1 
+    // [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     ldy print21_i
     cmp hello,y
     bne print21_b2
@@ -403,8 +410,8 @@ main: {
     jmp print22_b1
     // main::print22_@1
   print22_b1:
-    // [10] if(*((const byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2 -- pbuc1_derefidx_vbuz1_neq_vbuc2_then_la1 
+    // [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     ldy print22_i
     cmp hello,y
     bne print22_b2
@@ -457,16 +464,16 @@ main: {
   // File Data
 
 REGISTER UPLIFT POTENTIAL REGISTERS
-Statement [7] if(*((const byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2 [ main::print21_i#2 main::print21_j#2 ] ( main:2 [ main::print21_i#2 main::print21_j#2 ] ) always clobbers reg byte a 
+Statement [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2 [ main::print21_i#2 main::print21_j#2 ] ( main:2 [ main::print21_i#2 main::print21_j#2 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:2 [ main::print21_i#2 main::print21_i#1 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:3 [ main::print21_j#2 main::print21_j#1 ]
-Statement [10] if(*((const byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2 [ main::print22_i#2 main::print22_j#2 ] ( main:2 [ main::print22_i#2 main::print22_j#2 ] ) always clobbers reg byte a 
+Statement [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2 [ main::print22_i#2 main::print22_j#2 ] ( main:2 [ main::print22_i#2 main::print22_j#2 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:4 [ main::print22_i#2 main::print22_i#1 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:5 [ main::print22_j#2 main::print22_j#1 ]
 Statement [12] *((const byte*) main::print22_at#0 + (byte) main::print22_j#2) ← *((const byte*) main::hello#0 + (byte) main::print22_i#2) [ main::print22_i#2 main::print22_j#2 ] ( main:2 [ main::print22_i#2 main::print22_j#2 ] ) always clobbers reg byte a 
 Statement [15] *((const byte*) screen#0 + (byte) main::print21_j#2) ← *((const byte*) main::hello#0 + (byte) main::print21_i#2) [ main::print21_i#2 main::print21_j#2 ] ( main:2 [ main::print21_i#2 main::print21_j#2 ] ) always clobbers reg byte a 
-Statement [7] if(*((const byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2 [ main::print21_i#2 main::print21_j#2 ] ( main:2 [ main::print21_i#2 main::print21_j#2 ] ) always clobbers reg byte a 
+Statement [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2 [ main::print21_i#2 main::print21_j#2 ] ( main:2 [ main::print21_i#2 main::print21_j#2 ] ) always clobbers reg byte a 
-Statement [10] if(*((const byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2 [ main::print22_i#2 main::print22_j#2 ] ( main:2 [ main::print22_i#2 main::print22_j#2 ] ) always clobbers reg byte a 
+Statement [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2 [ main::print22_i#2 main::print22_j#2 ] ( main:2 [ main::print22_i#2 main::print22_j#2 ] ) always clobbers reg byte a 
 Statement [12] *((const byte*) main::print22_at#0 + (byte) main::print22_j#2) ← *((const byte*) main::hello#0 + (byte) main::print22_i#2) [ main::print22_i#2 main::print22_j#2 ] ( main:2 [ main::print22_i#2 main::print22_j#2 ] ) always clobbers reg byte a 
 Statement [15] *((const byte*) screen#0 + (byte) main::print21_j#2) ← *((const byte*) main::hello#0 + (byte) main::print21_i#2) [ main::print21_i#2 main::print21_j#2 ] ( main:2 [ main::print21_i#2 main::print21_j#2 ] ) always clobbers reg byte a 
 Potential registers zp ZP_BYTE:2 [ main::print21_i#2 main::print21_i#1 ] : zp ZP_BYTE:2 , reg byte x , reg byte y , 
@@ -522,8 +529,8 @@ main: {
     jmp print21_b1
     // main::print21_@1
   print21_b1:
-    // [7] if(*((const byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print21_b2
     // [8] phi from main::print21_@1 to main::print22 [phi:main::print21_@1->main::print22]
@@ -540,8 +547,8 @@ main: {
     jmp print22_b1
     // main::print22_@1
   print22_b1:
-    // [10] if(*((const byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print22_b2
     jmp breturn
@@ -612,6 +619,8 @@ Succesful ASM optimization Pass5UnusedLabelElimination
 Updating BasicUpstart to call main directly
 Removing instruction jsr main
 Succesful ASM optimization Pass5SkipBegin
+Replacing instruction ldx #0 with TAX
+Replacing instruction ldy #0 with TAY
 Removing instruction bbegin:
 Succesful ASM optimization Pass5UnusedLabelElimination
 
@@ -686,23 +695,23 @@ main: {
     ldy #0
     // main::print21_@1
   print21_b1:
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
-    // [7] if(*((const byte*) main::hello#0 + (byte) main::print21_i#2)!=(byte) '@') goto main::print21_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print21_i#2)) goto main::print21_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print21_b2
     // [8] phi from main::print21_@1 to main::print22 [phi:main::print21_@1->main::print22]
     // main::print22
     // [9] phi from main::print22 to main::print22_@1 [phi:main::print22->main::print22_@1]
     // [9] phi (byte) main::print22_j#2 = (byte) 0 [phi:main::print22->main::print22_@1#0] -- vbuxx=vbuc1 
-    ldx #0
+    tax
     // [9] phi (byte) main::print22_i#2 = (byte) 0 [phi:main::print22->main::print22_@1#1] -- vbuyy=vbuc1 
-    ldy #0
+    tay
     // main::print22_@1
   print22_b1:
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
-    // [10] if(*((const byte*) main::hello#0 + (byte) main::print22_i#2)!=(byte) '@') goto main::print22_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print22_i#2)) goto main::print22_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print22_b2
     // main::@return
@@ -719,7 +728,7 @@ main: {
     // [13] (byte) main::print22_j#1 ← (byte) main::print22_j#2 + (byte) 2 -- vbuxx=vbuxx_plus_2 
     inx
     inx
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
     // [14] (byte) main::print22_i#1 ← ++ (byte) main::print22_i#2 -- vbuyy=_inc_vbuyy 
     iny
     // [9] phi from main::print22_@2 to main::print22_@1 [phi:main::print22_@2->main::print22_@1]
@@ -736,7 +745,7 @@ main: {
     // [16] (byte) main::print21_j#1 ← (byte) main::print21_j#2 + (byte) 2 -- vbuxx=vbuxx_plus_2 
     inx
     inx
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
     // [17] (byte) main::print21_i#1 ← ++ (byte) main::print21_i#2 -- vbuyy=_inc_vbuyy 
     iny
     // [6] phi from main::print21_@2 to main::print21_@1 [phi:main::print21_@2->main::print21_@1]

src/test/ref/helloworld2.asm

@@ -19,19 +19,26 @@ main: {
 }
 // print2(byte* zeropage(2) at)
 print2: {
+    .label j = 4
     .label at = 2
-    ldy #0
+    lda #0
-    ldx #0
+    sta j
+    tax
   b1:
-    lda main.hello,x
+    txa
-    cmp #'@'
+    tay
+    lda #0
+    cmp main.hello,y
     bne b2
     rts
   b2:
     lda main.hello,x
+    ldy j
     sta (at),y
-    iny
+    tya
-    iny
+    clc
+    adc #2
+    sta j
     inx
     jmp b1
 }

src/test/ref/helloworld2.cfg

@@ -24,7 +24,7 @@ print2: scope:[print2]  from main main::@1
 print2::@1: scope:[print2]  from print2 print2::@2
   [10] (byte) print2::j#2 ← phi( print2/(byte) 0 print2::@2/(byte) print2::j#1 )
   [10] (byte) print2::i#2 ← phi( print2/(byte) 0 print2::@2/(byte) print2::i#1 )
-  [11] if(*((const byte*) main::hello#0 + (byte) print2::i#2)!=(byte) '@') goto print2::@2
+  [11] if((byte) 0!=*((const byte*) main::hello#0 + (byte) print2::i#2)) goto print2::@2
   to:print2::@return
 print2::@return: scope:[print2]  from print2::@1
   [12] return 

src/test/ref/helloworld2.log

@@ -1,3 +1,4 @@
+Warning! Adding boolean cast to non-boolean condition *((byte*) print2::msg + (byte) print2::i)
 Identified constant variable (byte*) screen
 Identified constant variable (byte*) main::hello
 Culled Empty Block (label) @1
@@ -38,7 +39,7 @@ print2::@1: scope:[print2]  from print2 print2::@2
   (byte*) print2::at#3 ← phi( print2/(byte*) print2::at#4 print2::@2/(byte*) print2::at#2 )
   (byte) print2::i#2 ← phi( print2/(byte) print2::i#0 print2::@2/(byte) print2::i#1 )
   (byte*) print2::msg#2 ← phi( print2/(byte*) print2::msg#4 print2::@2/(byte*) print2::msg#3 )
-  (bool~) print2::$0 ← *((byte*) print2::msg#2 + (byte) print2::i#2) != (byte) '@'
+  (bool~) print2::$0 ← (number) 0 != *((byte*) print2::msg#2 + (byte) print2::i#2)
   if((bool~) print2::$0) goto print2::@2
   to:print2::@return
 print2::@2: scope:[print2]  from print2::@1
@@ -106,6 +107,7 @@ SYMBOL TABLE SSA
 Adding number conversion cast (unumber) $50 in (byte*~) main::$1 ← (byte*) screen#0 + (number) $50
 Adding number conversion cast (unumber) 0 in (byte) print2::j#0 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) print2::i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print2::$0 ← (number) 0 != *((byte*) print2::msg#2 + (byte) print2::i#2)
 Adding number conversion cast (unumber) 2 in (byte) print2::j#1 ← (byte) print2::j#2 + (number) 2
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) screen#0 ← (byte*)(number) $400
@@ -116,11 +118,13 @@ Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast $50
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast 2
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) $50
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 2
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (byte*) print2::at#1 = (byte*~) main::$1 
@@ -132,7 +136,7 @@ Successful SSA optimization Pass2AliasElimination
 Identical Phi Values (byte*) print2::msg#2 (byte*) print2::msg#4
 Identical Phi Values (byte*) print2::at#2 (byte*) print2::at#4
 Successful SSA optimization Pass2IdenticalPhiElimination
-Simple Condition (bool~) print2::$0 [15] if(*((byte*) print2::msg#4 + (byte) print2::i#2)!=(byte) '@') goto print2::@2
+Simple Condition (bool~) print2::$0 [15] if((byte) 0!=*((byte*) print2::msg#4 + (byte) print2::i#2)) goto print2::@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte*) screen#0 = (byte*) 1024
 Constant (const byte*) main::hello#0 = main::$3
@@ -214,7 +218,7 @@ print2: scope:[print2]  from main main::@1
 print2::@1: scope:[print2]  from print2 print2::@2
   [10] (byte) print2::j#2 ← phi( print2/(byte) 0 print2::@2/(byte) print2::j#1 )
   [10] (byte) print2::i#2 ← phi( print2/(byte) 0 print2::@2/(byte) print2::i#1 )
-  [11] if(*((const byte*) main::hello#0 + (byte) print2::i#2)!=(byte) '@') goto print2::@2
+  [11] if((byte) 0!=*((const byte*) main::hello#0 + (byte) print2::i#2)) goto print2::@2
   to:print2::@return
 print2::@return: scope:[print2]  from print2::@1
   [12] return 
@@ -328,8 +332,8 @@ print2: {
     jmp b1
     // print2::@1
   b1:
-    // [11] if(*((const byte*) main::hello#0 + (byte) print2::i#2)!=(byte) '@') goto print2::@2 -- pbuc1_derefidx_vbuz1_neq_vbuc2_then_la1 
+    // [11] if((byte) 0!=*((const byte*) main::hello#0 + (byte) print2::i#2)) goto print2::@2 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     ldy i
     cmp main.hello,y
     bne b2
@@ -361,11 +365,11 @@ print2: {
   // File Data
 
 REGISTER UPLIFT POTENTIAL REGISTERS
-Statement [11] if(*((const byte*) main::hello#0 + (byte) print2::i#2)!=(byte) '@') goto print2::@2 [ print2::at#4 print2::i#2 print2::j#2 ] ( main:2::print2:5 [ print2::at#4 print2::i#2 print2::j#2 ] main:2::print2:7 [ print2::at#4 print2::i#2 print2::j#2 ] ) always clobbers reg byte a 
+Statement [11] if((byte) 0!=*((const byte*) main::hello#0 + (byte) print2::i#2)) goto print2::@2 [ print2::at#4 print2::i#2 print2::j#2 ] ( main:2::print2:5 [ print2::at#4 print2::i#2 print2::j#2 ] main:2::print2:7 [ print2::at#4 print2::i#2 print2::j#2 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:4 [ print2::i#2 print2::i#1 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:5 [ print2::j#2 print2::j#1 ]
 Statement [13] *((byte*) print2::at#4 + (byte) print2::j#2) ← *((const byte*) main::hello#0 + (byte) print2::i#2) [ print2::at#4 print2::i#2 print2::j#2 ] ( main:2::print2:5 [ print2::at#4 print2::i#2 print2::j#2 ] main:2::print2:7 [ print2::at#4 print2::i#2 print2::j#2 ] ) always clobbers reg byte a 
-Statement [11] if(*((const byte*) main::hello#0 + (byte) print2::i#2)!=(byte) '@') goto print2::@2 [ print2::at#4 print2::i#2 print2::j#2 ] ( main:2::print2:5 [ print2::at#4 print2::i#2 print2::j#2 ] main:2::print2:7 [ print2::at#4 print2::i#2 print2::j#2 ] ) always clobbers reg byte a 
+Statement [11] if((byte) 0!=*((const byte*) main::hello#0 + (byte) print2::i#2)) goto print2::@2 [ print2::at#4 print2::i#2 print2::j#2 ] ( main:2::print2:5 [ print2::at#4 print2::i#2 print2::j#2 ] main:2::print2:7 [ print2::at#4 print2::i#2 print2::j#2 ] ) always clobbers reg byte a 
 Statement [13] *((byte*) print2::at#4 + (byte) print2::j#2) ← *((const byte*) main::hello#0 + (byte) print2::i#2) [ print2::at#4 print2::i#2 print2::j#2 ] ( main:2::print2:5 [ print2::at#4 print2::i#2 print2::j#2 ] main:2::print2:7 [ print2::at#4 print2::i#2 print2::j#2 ] ) always clobbers reg byte a 
 Potential registers zp ZP_WORD:2 [ print2::at#4 ] : zp ZP_WORD:2 , 
 Potential registers zp ZP_BYTE:4 [ print2::i#2 print2::i#1 ] : zp ZP_BYTE:4 , reg byte x , reg byte y , 
@@ -376,9 +380,12 @@ Uplift Scope [print2] 33: zp ZP_BYTE:4 [ print2::i#2 print2::i#1 ] 22: zp ZP_BYT
 Uplift Scope [main] 
 Uplift Scope [] 
 
-Uplifting [print2] best 447 combination reg byte x [ print2::i#2 print2::i#1 ] reg byte y [ print2::j#2 print2::j#1 ] zp ZP_WORD:2 [ print2::at#4 ] 
+Uplifting [print2] best 607 combination reg byte x [ print2::i#2 print2::i#1 ] zp ZP_BYTE:5 [ print2::j#2 print2::j#1 ] zp ZP_WORD:2 [ print2::at#4 ] 
-Uplifting [main] best 447 combination 
+Uplifting [main] best 607 combination 
-Uplifting [] best 447 combination 
+Uplifting [] best 607 combination 
+Attempting to uplift remaining variables inzp ZP_BYTE:5 [ print2::j#2 print2::j#1 ]
+Uplifting [print2] best 607 combination zp ZP_BYTE:5 [ print2::j#2 print2::j#1 ] 
+Allocated (was zp ZP_BYTE:5) zp ZP_BYTE:4 [ print2::j#2 print2::j#1 ]
 
 ASSEMBLER BEFORE OPTIMIZATION
   // File Comments
@@ -440,19 +447,23 @@ main: {
   // print2
 // print2(byte* zeropage(2) at)
 print2: {
+    .label j = 4
     .label at = 2
     // [10] phi from print2 to print2::@1 [phi:print2->print2::@1]
   b1_from_print2:
-    // [10] phi (byte) print2::j#2 = (byte) 0 [phi:print2->print2::@1#0] -- vbuyy=vbuc1 
+    // [10] phi (byte) print2::j#2 = (byte) 0 [phi:print2->print2::@1#0] -- vbuz1=vbuc1 
-    ldy #0
+    lda #0
+    sta j
     // [10] phi (byte) print2::i#2 = (byte) 0 [phi:print2->print2::@1#1] -- vbuxx=vbuc1 
     ldx #0
     jmp b1
     // print2::@1
   b1:
-    // [11] if(*((const byte*) main::hello#0 + (byte) print2::i#2)!=(byte) '@') goto print2::@2 -- pbuc1_derefidx_vbuxx_neq_vbuc2_then_la1 
+    // [11] if((byte) 0!=*((const byte*) main::hello#0 + (byte) print2::i#2)) goto print2::@2 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1 
-    lda main.hello,x
+    txa
-    cmp #'@'
+    tay
+    lda #0
+    cmp main.hello,y
     bne b2
     jmp breturn
     // print2::@return
@@ -461,12 +472,15 @@ print2: {
     rts
     // print2::@2
   b2:
-    // [13] *((byte*) print2::at#4 + (byte) print2::j#2) ← *((const byte*) main::hello#0 + (byte) print2::i#2) -- pbuz1_derefidx_vbuyy=pbuc1_derefidx_vbuxx 
+    // [13] *((byte*) print2::at#4 + (byte) print2::j#2) ← *((const byte*) main::hello#0 + (byte) print2::i#2) -- pbuz1_derefidx_vbuz2=pbuc1_derefidx_vbuxx 
     lda main.hello,x
+    ldy j
     sta (at),y
-    // [14] (byte) print2::j#1 ← (byte) print2::j#2 + (byte) 2 -- vbuyy=vbuyy_plus_2 
+    // [14] (byte) print2::j#1 ← (byte) print2::j#2 + (byte) 2 -- vbuz1=vbuz1_plus_2 
-    iny
+    lda j
-    iny
+    clc
+    adc #2
+    sta j
     // [15] (byte) print2::i#1 ← ++ (byte) print2::i#2 -- vbuxx=_inc_vbuxx 
     inx
     // [10] phi from print2::@2 to print2::@1 [phi:print2::@2->print2::@1]
@@ -485,6 +499,8 @@ Removing instruction jmp breturn
 Removing instruction jmp b1
 Removing instruction jmp breturn
 Succesful ASM optimization Pass5NextJumpElimination
+Replacing instruction ldx #0 with TAX
+Replacing instruction lda j with TYA
 Removing instruction b1_from_bbegin:
 Removing instruction b1:
 Removing instruction main_from_b1:
@@ -525,19 +541,19 @@ FINAL SYMBOL TABLE
 (byte) print2::i#1 reg byte x 22.0
 (byte) print2::i#2 reg byte x 11.0
 (byte) print2::j
-(byte) print2::j#1 reg byte y 11.0
+(byte) print2::j#1 j zp ZP_BYTE:4 11.0
-(byte) print2::j#2 reg byte y 11.0
+(byte) print2::j#2 j zp ZP_BYTE:4 11.0
 (byte*) print2::msg
 (byte*) screen
 (const byte*) screen#0 screen = (byte*) 1024
 
 zp ZP_WORD:2 [ print2::at#4 ]
 reg byte x [ print2::i#2 print2::i#1 ]
-reg byte y [ print2::j#2 print2::j#1 ]
+zp ZP_BYTE:4 [ print2::j#2 print2::j#1 ]
 
 
 FINAL ASSEMBLER
-Score: 369
+Score: 519
 
   // File Comments
   // Upstart
@@ -585,18 +601,22 @@ main: {
   // print2
 // print2(byte* zeropage(2) at)
 print2: {
+    .label j = 4
     .label at = 2
     // [10] phi from print2 to print2::@1 [phi:print2->print2::@1]
-    // [10] phi (byte) print2::j#2 = (byte) 0 [phi:print2->print2::@1#0] -- vbuyy=vbuc1 
+    // [10] phi (byte) print2::j#2 = (byte) 0 [phi:print2->print2::@1#0] -- vbuz1=vbuc1 
-    ldy #0
+    lda #0
+    sta j
     // [10] phi (byte) print2::i#2 = (byte) 0 [phi:print2->print2::@1#1] -- vbuxx=vbuc1 
-    ldx #0
+    tax
     // print2::@1
   b1:
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
-    // [11] if(*((const byte*) main::hello#0 + (byte) print2::i#2)!=(byte) '@') goto print2::@2 -- pbuc1_derefidx_vbuxx_neq_vbuc2_then_la1 
+    // [11] if((byte) 0!=*((const byte*) main::hello#0 + (byte) print2::i#2)) goto print2::@2 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1 
-    lda main.hello,x
+    txa
-    cmp #'@'
+    tay
+    lda #0
+    cmp main.hello,y
     bne b2
     // print2::@return
     // }
@@ -605,14 +625,17 @@ print2: {
     // print2::@2
   b2:
     // at[j] = msg[i]
-    // [13] *((byte*) print2::at#4 + (byte) print2::j#2) ← *((const byte*) main::hello#0 + (byte) print2::i#2) -- pbuz1_derefidx_vbuyy=pbuc1_derefidx_vbuxx 
+    // [13] *((byte*) print2::at#4 + (byte) print2::j#2) ← *((const byte*) main::hello#0 + (byte) print2::i#2) -- pbuz1_derefidx_vbuz2=pbuc1_derefidx_vbuxx 
     lda main.hello,x
+    ldy j
     sta (at),y
     // j += 2
-    // [14] (byte) print2::j#1 ← (byte) print2::j#2 + (byte) 2 -- vbuyy=vbuyy_plus_2 
+    // [14] (byte) print2::j#1 ← (byte) print2::j#2 + (byte) 2 -- vbuz1=vbuz1_plus_2 
-    iny
+    tya
-    iny
+    clc
-    // for(byte i=0; msg[i]!='@'; i++)
+    adc #2
+    sta j
+    // for(byte i=0; msg[i]; i++)
     // [15] (byte) print2::i#1 ← ++ (byte) print2::i#2 -- vbuxx=_inc_vbuxx 
     inx
     // [10] phi from print2::@2 to print2::@1 [phi:print2::@2->print2::@1]

src/test/ref/helloworld2.sym

@@ -16,12 +16,12 @@
 (byte) print2::i#1 reg byte x 22.0
 (byte) print2::i#2 reg byte x 11.0
 (byte) print2::j
-(byte) print2::j#1 reg byte y 11.0
+(byte) print2::j#1 j zp ZP_BYTE:4 11.0
-(byte) print2::j#2 reg byte y 11.0
+(byte) print2::j#2 j zp ZP_BYTE:4 11.0
 (byte*) print2::msg
 (byte*) screen
 (const byte*) screen#0 screen = (byte*) 1024
 
 zp ZP_WORD:2 [ print2::at#4 ]
 reg byte x [ print2::i#2 print2::i#1 ]
-reg byte y [ print2::j#2 print2::j#1 ]
+zp ZP_BYTE:4 [ print2::j#2 print2::j#1 ]

src/test/ref/incrementinarray.asm

@@ -63,7 +63,7 @@ print_str: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/incrementinarray.cfg

@@ -49,7 +49,7 @@ print_str: scope:[print_str]  from main::@1
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [21] (byte*) print_char_cursor#12 ← phi( print_str/(byte*) print_char_cursor#25 print_str::@2/(byte*) print_char_cursor#1 )
   [21] (byte*) print_str::str#2 ← phi( print_str/(const byte[]) txt#0 print_str::@2/(byte*) print_str::str#0 )
-  [22] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2
+  [22] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [23] return 

src/test/ref/incrementinarray.log

@@ -4,6 +4,11 @@ Fixing pointer addition (word*~) bsearch16u::$1 ← (word*) bsearch16u::items -
 Fixing pointer array-indexing *((word*) utoa::digit_values + (byte) utoa::digit)
 Fixing pointer array-indexing *((dword*) ultoa::digit_values + (byte) ultoa::digit)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Culled Empty Block (label) @1
 Culled Empty Block (label) @2
@@ -107,7 +112,7 @@ print_str: scope:[print_str]  from main::@1
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   (byte*) print_char_cursor#22 ← phi( print_str/(byte*) print_char_cursor#27 print_str::@2/(byte*) print_char_cursor#1 )
   (byte*) print_str::str#2 ← phi( print_str/(byte*) print_str::str#4 print_str::@2/(byte*) print_str::str#0 )
-  (bool~) print_str::$0 ← *((byte*) print_str::str#2) != (byte) '@'
+  (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#2)
   if((bool~) print_str::$0) goto print_str::@2
   to:print_str::@return
 print_str::@2: scope:[print_str]  from print_str::@1
@@ -382,6 +387,7 @@ SYMBOL TABLE SSA
 (byte[]) txt#0
 
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#2)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#9 + (number) $28
 Adding number conversion cast (unumber) $3e8 in (word) memset::num#0 ← (number) $3e8
 Adding number conversion cast (unumber) 1 in *((byte[]) txt#0 + (number) 1) ← ++ *((byte[]) txt#0 + (number) 1)
@@ -394,12 +400,14 @@ Inlining cast (word) memset::num#0 ← (unumber)(number) $3e8
 Successful SSA optimization Pass2InlineCast
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast $3e8
 Simplifying constant integer cast 1
 Simplifying constant integer cast 1
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized unsigned number type (word) $3e8
 Finalized unsigned number type (byte) 1
@@ -458,7 +466,7 @@ Identical Phi Values (void*) memset::return#0 (void*) memset::str#0
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) memset::$1 [3] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [13] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str::$0 [26] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2
+Simple Condition (bool~) print_str::$0 [26] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2
 Simple Condition (bool~) print_ln::$1 [39] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#12) goto print_ln::@1
 Simple Condition (bool~) main::$3 [79] if((byte) main::i#1!=rangelast(0,$a)) goto main::@1
 Successful SSA optimization Pass2ConditionalJumpSimplification
@@ -631,7 +639,7 @@ print_str: scope:[print_str]  from main::@1
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [21] (byte*) print_char_cursor#12 ← phi( print_str/(byte*) print_char_cursor#25 print_str::@2/(byte*) print_char_cursor#1 )
   [21] (byte*) print_str::str#2 ← phi( print_str/(const byte[]) txt#0 print_str::@2/(byte*) print_str::str#0 )
-  [22] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2
+  [22] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [23] return 
@@ -860,10 +868,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [22] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [22] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -963,7 +971,7 @@ Removing always clobbered register reg byte a as potential for zp ZP_BYTE:2 [ ma
 Statement [14] (byte*~) print_char_cursor#31 ← (byte*) print_line_cursor#1 [ print_char_cursor#31 print_line_cursor#1 main::i#1 ] ( main:2 [ print_char_cursor#31 print_line_cursor#1 main::i#1 ] ) always clobbers reg byte a 
 Statement [17] (byte*) print_line_cursor#1 ← (byte*) print_line_cursor#9 + (byte) $28 [ print_line_cursor#1 print_char_cursor#12 ] ( main:2::print_ln:9 [ main::i#2 print_line_cursor#1 print_char_cursor#12 ] ) always clobbers reg byte a 
 Statement [18] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#12) goto print_ln::@1 [ print_line_cursor#1 print_char_cursor#12 ] ( main:2::print_ln:9 [ main::i#2 print_line_cursor#1 print_char_cursor#12 ] ) always clobbers reg byte a 
-Statement [22] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 [ print_char_cursor#12 print_str::str#2 ] ( main:2::print_str:7 [ print_line_cursor#19 main::i#2 print_char_cursor#12 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
+Statement [22] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 [ print_char_cursor#12 print_str::str#2 ] ( main:2::print_str:7 [ print_line_cursor#19 main::i#2 print_char_cursor#12 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:2 [ main::i#2 main::i#1 ]
 Statement [24] *((byte*) print_char_cursor#12) ← *((byte*) print_str::str#2) [ print_char_cursor#12 print_str::str#2 ] ( main:2::print_str:7 [ print_line_cursor#19 main::i#2 print_char_cursor#12 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
 Statement [32] *((byte*) memset::dst#4) ← (const byte) memset::c#0 [ memset::dst#4 ] ( main:2::print_cls:5::memset:28 [ memset::dst#4 ] ) always clobbers reg byte a reg byte y 
@@ -972,7 +980,7 @@ Statement [10] *((const byte[]) txt#0+(byte) 1) ← ++ *((const byte[]) txt#0+(b
 Statement [14] (byte*~) print_char_cursor#31 ← (byte*) print_line_cursor#1 [ print_char_cursor#31 print_line_cursor#1 main::i#1 ] ( main:2 [ print_char_cursor#31 print_line_cursor#1 main::i#1 ] ) always clobbers reg byte a 
 Statement [17] (byte*) print_line_cursor#1 ← (byte*) print_line_cursor#9 + (byte) $28 [ print_line_cursor#1 print_char_cursor#12 ] ( main:2::print_ln:9 [ main::i#2 print_line_cursor#1 print_char_cursor#12 ] ) always clobbers reg byte a 
 Statement [18] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#12) goto print_ln::@1 [ print_line_cursor#1 print_char_cursor#12 ] ( main:2::print_ln:9 [ main::i#2 print_line_cursor#1 print_char_cursor#12 ] ) always clobbers reg byte a 
-Statement [22] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 [ print_char_cursor#12 print_str::str#2 ] ( main:2::print_str:7 [ print_line_cursor#19 main::i#2 print_char_cursor#12 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
+Statement [22] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 [ print_char_cursor#12 print_str::str#2 ] ( main:2::print_str:7 [ print_line_cursor#19 main::i#2 print_char_cursor#12 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
 Statement [24] *((byte*) print_char_cursor#12) ← *((byte*) print_str::str#2) [ print_char_cursor#12 print_str::str#2 ] ( main:2::print_str:7 [ print_line_cursor#19 main::i#2 print_char_cursor#12 print_str::str#2 ] ) always clobbers reg byte a reg byte y 
 Statement [32] *((byte*) memset::dst#4) ← (const byte) memset::c#0 [ memset::dst#4 ] ( main:2::print_cls:5::memset:28 [ memset::dst#4 ] ) always clobbers reg byte a reg byte y 
 Statement [34] if((byte*) memset::dst#1!=(const byte*) memset::end#0) goto memset::@2 [ memset::dst#1 ] ( main:2::print_cls:5::memset:28 [ memset::dst#1 ] ) always clobbers reg byte a 
@@ -1145,10 +1153,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [22] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [22] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -1488,11 +1496,11 @@ print_str: {
     sta str+1
     // print_str::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [22] if(*((byte*) print_str::str#2)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [22] if((byte) 0!=*((byte*) print_str::str#2)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str::@return
     // }

src/test/ref/inline-function-print.asm

@@ -8,13 +8,13 @@ main: {
     ldx #0
     ldy #0
   print1_b1:
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print1_b2
-    ldx #0
+    tax
-    ldy #0
+    tay
   print2_b1:
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print2_b2
     rts

src/test/ref/inline-function-print.cfg

@@ -16,7 +16,7 @@ main::print1: scope:[main]  from main
 main::print1_@1: scope:[main]  from main::print1 main::print1_@2
   [6] (byte) main::print1_j#2 ← phi( main::print1/(byte) 0 main::print1_@2/(byte) main::print1_j#1 )
   [6] (byte) main::print1_i#2 ← phi( main::print1/(byte) 0 main::print1_@2/(byte) main::print1_i#1 )
-  [7] if(*((const byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2
+  [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2
   to:main::print2
 main::print2: scope:[main]  from main::print1_@1
   [8] phi()
@@ -24,7 +24,7 @@ main::print2: scope:[main]  from main::print1_@1
 main::print2_@1: scope:[main]  from main::print2 main::print2_@2
   [9] (byte) main::print2_j#2 ← phi( main::print2/(byte) 0 main::print2_@2/(byte) main::print2_j#1 )
   [9] (byte) main::print2_i#2 ← phi( main::print2/(byte) 0 main::print2_@2/(byte) main::print2_i#1 )
-  [10] if(*((const byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2
+  [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2
   to:main::@return
 main::@return: scope:[main]  from main::print2_@1
   [11] return 

src/test/ref/inline-function-print.log

@@ -1,3 +1,4 @@
+Warning! Adding boolean cast to non-boolean condition *((byte*) print::msg + (byte) print::i)
 Identified constant variable (byte*) screen
 Identified constant variable (byte*) main::hello
 Inlined call call print (byte*) screen (byte*) main::hello 
@@ -35,7 +36,7 @@ main::print1_@1: scope:[main]  from main::print1 main::print1_@2
   (byte*) main::print1_at#2 ← phi( main::print1/(byte*) main::print1_at#3 main::print1_@2/(byte*) main::print1_at#1 )
   (byte) main::print1_i#2 ← phi( main::print1/(byte) main::print1_i#0 main::print1_@2/(byte) main::print1_i#1 )
   (byte*) main::print1_msg#1 ← phi( main::print1/(byte*) main::print1_msg#3 main::print1_@2/(byte*) main::print1_msg#2 )
-  (bool~) main::print1_$0#0 ← *((byte*) main::print1_msg#1 + (byte) main::print1_i#2) != (byte) '@'
+  (bool~) main::print1_$0#0 ← (number) 0 != *((byte*) main::print1_msg#1 + (byte) main::print1_i#2)
   if((bool~) main::print1_$0#0) goto main::print1_@2
   to:main::@1
 main::print1_@2: scope:[main]  from main::print1_@1
@@ -63,7 +64,7 @@ main::print2_@1: scope:[main]  from main::print2 main::print2_@2
   (byte*) main::print2_at#2 ← phi( main::print2/(byte*) main::print2_at#3 main::print2_@2/(byte*) main::print2_at#1 )
   (byte) main::print2_i#2 ← phi( main::print2/(byte) main::print2_i#0 main::print2_@2/(byte) main::print2_i#1 )
   (byte*) main::print2_msg#1 ← phi( main::print2/(byte*) main::print2_msg#3 main::print2_@2/(byte*) main::print2_msg#2 )
-  (bool~) main::print2_$0#0 ← *((byte*) main::print2_msg#1 + (byte) main::print2_i#2) != (byte) '@'
+  (bool~) main::print2_$0#0 ← (number) 0 != *((byte*) main::print2_msg#1 + (byte) main::print2_i#2)
   if((bool~) main::print2_$0#0) goto main::print2_@2
   to:main::@return
 main::print2_@2: scope:[main]  from main::print2_@1
@@ -152,10 +153,12 @@ SYMBOL TABLE SSA
 
 Adding number conversion cast (unumber) 0 in (byte) main::print1_j#0 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) main::print1_i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) main::print1_$0#0 ← (number) 0 != *((byte*) main::print1_msg#1 + (byte) main::print1_i#2)
 Adding number conversion cast (unumber) 2 in (byte) main::print1_j#1 ← (byte) main::print1_j#2 + (number) 2
 Adding number conversion cast (unumber) 2*$28 in (byte*~) main::$1 ← (byte*) screen#0 + (number) 2*(number) $28
 Adding number conversion cast (unumber) 0 in (byte) main::print2_j#0 ← (number) 0
 Adding number conversion cast (unumber) 0 in (byte) main::print2_i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) main::print2_$0#0 ← (number) 0 != *((byte*) main::print2_msg#1 + (byte) main::print2_i#2)
 Adding number conversion cast (unumber) 2 in (byte) main::print2_j#1 ← (byte) main::print2_j#2 + (number) 2
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) screen#0 ← (byte*)(number) $400
@@ -167,16 +170,20 @@ Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast 2
 Simplifying constant integer cast 0
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Simplifying constant integer cast 2
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 2
 Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) 2
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (byte*) main::hello#0 = (byte*) main::print1_msg#0 (byte*) main::print1_msg#3 (byte*) main::print2_msg#0 (byte*) main::print2_msg#3 
@@ -196,8 +203,8 @@ Identical Phi Values (byte*) main::print1_at#1 (byte*) main::print1_at#0
 Identical Phi Values (byte*) main::print2_msg#1 (byte*) main::hello#0
 Identical Phi Values (byte*) main::print2_at#1 (byte*) main::print2_at#0
 Successful SSA optimization Pass2IdenticalPhiElimination
-Simple Condition (bool~) main::print1_$0#0 [9] if(*((byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2
+Simple Condition (bool~) main::print1_$0#0 [9] if((byte) 0!=*((byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2
-Simple Condition (bool~) main::print2_$0#0 [22] if(*((byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2
+Simple Condition (bool~) main::print2_$0#0 [22] if((byte) 0!=*((byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte*) screen#0 = (byte*) 1024
 Constant (const byte*) main::hello#0 = main::$3
@@ -269,7 +276,7 @@ main::print1: scope:[main]  from main
 main::print1_@1: scope:[main]  from main::print1 main::print1_@2
   [6] (byte) main::print1_j#2 ← phi( main::print1/(byte) 0 main::print1_@2/(byte) main::print1_j#1 )
   [6] (byte) main::print1_i#2 ← phi( main::print1/(byte) 0 main::print1_@2/(byte) main::print1_i#1 )
-  [7] if(*((const byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2
+  [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2
   to:main::print2
 main::print2: scope:[main]  from main::print1_@1
   [8] phi()
@@ -277,7 +284,7 @@ main::print2: scope:[main]  from main::print1_@1
 main::print2_@1: scope:[main]  from main::print2 main::print2_@2
   [9] (byte) main::print2_j#2 ← phi( main::print2/(byte) 0 main::print2_@2/(byte) main::print2_j#1 )
   [9] (byte) main::print2_i#2 ← phi( main::print2/(byte) 0 main::print2_@2/(byte) main::print2_i#1 )
-  [10] if(*((const byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2
+  [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2
   to:main::@return
 main::@return: scope:[main]  from main::print2_@1
   [11] return 
@@ -381,8 +388,8 @@ main: {
     jmp print1_b1
     // main::print1_@1
   print1_b1:
-    // [7] if(*((const byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2 -- pbuc1_derefidx_vbuz1_neq_vbuc2_then_la1 
+    // [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     ldy print1_i
     cmp hello,y
     bne print1_b2
@@ -402,8 +409,8 @@ main: {
     jmp print2_b1
     // main::print2_@1
   print2_b1:
-    // [10] if(*((const byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2 -- pbuc1_derefidx_vbuz1_neq_vbuc2_then_la1 
+    // [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     ldy print2_i
     cmp hello,y
     bne print2_b2
@@ -456,16 +463,16 @@ main: {
   // File Data
 
 REGISTER UPLIFT POTENTIAL REGISTERS
-Statement [7] if(*((const byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2 [ main::print1_i#2 main::print1_j#2 ] ( main:2 [ main::print1_i#2 main::print1_j#2 ] ) always clobbers reg byte a 
+Statement [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2 [ main::print1_i#2 main::print1_j#2 ] ( main:2 [ main::print1_i#2 main::print1_j#2 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:2 [ main::print1_i#2 main::print1_i#1 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:3 [ main::print1_j#2 main::print1_j#1 ]
-Statement [10] if(*((const byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2 [ main::print2_i#2 main::print2_j#2 ] ( main:2 [ main::print2_i#2 main::print2_j#2 ] ) always clobbers reg byte a 
+Statement [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2 [ main::print2_i#2 main::print2_j#2 ] ( main:2 [ main::print2_i#2 main::print2_j#2 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:4 [ main::print2_i#2 main::print2_i#1 ]
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:5 [ main::print2_j#2 main::print2_j#1 ]
 Statement [12] *((const byte*) main::print2_at#0 + (byte) main::print2_j#2) ← *((const byte*) main::hello#0 + (byte) main::print2_i#2) [ main::print2_i#2 main::print2_j#2 ] ( main:2 [ main::print2_i#2 main::print2_j#2 ] ) always clobbers reg byte a 
 Statement [15] *((const byte*) screen#0 + (byte) main::print1_j#2) ← *((const byte*) main::hello#0 + (byte) main::print1_i#2) [ main::print1_i#2 main::print1_j#2 ] ( main:2 [ main::print1_i#2 main::print1_j#2 ] ) always clobbers reg byte a 
-Statement [7] if(*((const byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2 [ main::print1_i#2 main::print1_j#2 ] ( main:2 [ main::print1_i#2 main::print1_j#2 ] ) always clobbers reg byte a 
+Statement [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2 [ main::print1_i#2 main::print1_j#2 ] ( main:2 [ main::print1_i#2 main::print1_j#2 ] ) always clobbers reg byte a 
-Statement [10] if(*((const byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2 [ main::print2_i#2 main::print2_j#2 ] ( main:2 [ main::print2_i#2 main::print2_j#2 ] ) always clobbers reg byte a 
+Statement [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2 [ main::print2_i#2 main::print2_j#2 ] ( main:2 [ main::print2_i#2 main::print2_j#2 ] ) always clobbers reg byte a 
 Statement [12] *((const byte*) main::print2_at#0 + (byte) main::print2_j#2) ← *((const byte*) main::hello#0 + (byte) main::print2_i#2) [ main::print2_i#2 main::print2_j#2 ] ( main:2 [ main::print2_i#2 main::print2_j#2 ] ) always clobbers reg byte a 
 Statement [15] *((const byte*) screen#0 + (byte) main::print1_j#2) ← *((const byte*) main::hello#0 + (byte) main::print1_i#2) [ main::print1_i#2 main::print1_j#2 ] ( main:2 [ main::print1_i#2 main::print1_j#2 ] ) always clobbers reg byte a 
 Potential registers zp ZP_BYTE:2 [ main::print1_i#2 main::print1_i#1 ] : zp ZP_BYTE:2 , reg byte x , reg byte y , 
@@ -522,8 +529,8 @@ main: {
     jmp print1_b1
     // main::print1_@1
   print1_b1:
-    // [7] if(*((const byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print1_b2
     // [8] phi from main::print1_@1 to main::print2 [phi:main::print1_@1->main::print2]
@@ -540,8 +547,8 @@ main: {
     jmp print2_b1
     // main::print2_@1
   print2_b1:
-    // [10] if(*((const byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print2_b2
     jmp breturn
@@ -612,6 +619,8 @@ Succesful ASM optimization Pass5UnusedLabelElimination
 Updating BasicUpstart to call main directly
 Removing instruction jsr main
 Succesful ASM optimization Pass5SkipBegin
+Replacing instruction ldx #0 with TAX
+Replacing instruction ldy #0 with TAY
 Removing instruction bbegin:
 Succesful ASM optimization Pass5UnusedLabelElimination
 
@@ -687,23 +696,23 @@ main: {
     ldy #0
     // main::print1_@1
   print1_b1:
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
-    // [7] if(*((const byte*) main::hello#0 + (byte) main::print1_i#2)!=(byte) '@') goto main::print1_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [7] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print1_i#2)) goto main::print1_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print1_b2
     // [8] phi from main::print1_@1 to main::print2 [phi:main::print1_@1->main::print2]
     // main::print2
     // [9] phi from main::print2 to main::print2_@1 [phi:main::print2->main::print2_@1]
     // [9] phi (byte) main::print2_j#2 = (byte) 0 [phi:main::print2->main::print2_@1#0] -- vbuxx=vbuc1 
-    ldx #0
+    tax
     // [9] phi (byte) main::print2_i#2 = (byte) 0 [phi:main::print2->main::print2_@1#1] -- vbuyy=vbuc1 
-    ldy #0
+    tay
     // main::print2_@1
   print2_b1:
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
-    // [10] if(*((const byte*) main::hello#0 + (byte) main::print2_i#2)!=(byte) '@') goto main::print2_@2 -- pbuc1_derefidx_vbuyy_neq_vbuc2_then_la1 
+    // [10] if((byte) 0!=*((const byte*) main::hello#0 + (byte) main::print2_i#2)) goto main::print2_@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda #'@'
+    lda #0
     cmp hello,y
     bne print2_b2
     // main::@return
@@ -720,7 +729,7 @@ main: {
     // [13] (byte) main::print2_j#1 ← (byte) main::print2_j#2 + (byte) 2 -- vbuxx=vbuxx_plus_2 
     inx
     inx
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
     // [14] (byte) main::print2_i#1 ← ++ (byte) main::print2_i#2 -- vbuyy=_inc_vbuyy 
     iny
     // [9] phi from main::print2_@2 to main::print2_@1 [phi:main::print2_@2->main::print2_@1]
@@ -737,7 +746,7 @@ main: {
     // [16] (byte) main::print1_j#1 ← (byte) main::print1_j#2 + (byte) 2 -- vbuxx=vbuxx_plus_2 
     inx
     inx
-    // for(byte i=0; msg[i]!='@'; i++)
+    // for(byte i=0; msg[i]; i++)
     // [17] (byte) main::print1_i#1 ← ++ (byte) main::print1_i#2 -- vbuyy=_inc_vbuyy 
     iny
     // [6] phi from main::print1_@2 to main::print1_@1 [phi:main::print1_@2->main::print1_@1]

src/test/ref/inline-string-2.asm

@@ -43,7 +43,7 @@ print: {
   b1:
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/inline-string-2.cfg

@@ -40,7 +40,7 @@ print: scope:[print]  from print_msg::@2
 print::@1: scope:[print]  from print print::@2
   [17] (byte*) screen#14 ← phi( print/(byte*) screen#18 print::@2/(byte*) screen#6 )
   [17] (byte*) print::msg#2 ← phi( print/(byte*) print::msg#0 print::@2/(byte*) print::msg#1 )
-  [18] if(*((byte*) print::msg#2)!=(byte) '@') goto print::@2
+  [18] if((byte) 0!=*((byte*) print::msg#2)) goto print::@2
   to:print::@return
 print::@return: scope:[print]  from print::@1
   [19] return 

src/test/ref/inline-string-2.log

@@ -1,3 +1,4 @@
+Warning! Adding boolean cast to non-boolean condition *((byte*) print::msg)
 Culled Empty Block (label) @1
 Culled Empty Block (label) print_msg::@4
 Culled Empty Block (label) print::@4
@@ -68,7 +69,7 @@ print: scope:[print]  from print_msg::@2
 print::@1: scope:[print]  from print print::@2
   (byte*) screen#19 ← phi( print/(byte*) screen#23 print::@2/(byte*) screen#6 )
   (byte*) print::msg#2 ← phi( print/(byte*) print::msg#4 print::@2/(byte*) print::msg#1 )
-  (bool~) print::$0 ← *((byte*) print::msg#2) != (byte) '@'
+  (bool~) print::$0 ← (number) 0 != *((byte*) print::msg#2)
   if((bool~) print::$0) goto print::@2
   to:print::@return
 print::@2: scope:[print]  from print::@1
@@ -162,6 +163,7 @@ SYMBOL TABLE SSA
 Adding number conversion cast (unumber) 1 in (byte) print_msg::idx#0 ← (number) 1
 Adding number conversion cast (unumber) 2 in (byte) print_msg::idx#1 ← (number) 2
 Adding number conversion cast (unumber) 1 in (bool~) print_msg::$0 ← (byte) print_msg::idx#2 == (number) 1
+Adding number conversion cast (unumber) 0 in (bool~) print::$0 ← (number) 0 != *((byte*) print::msg#2)
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte) print_msg::idx#0 ← (unumber)(number) 1
 Inlining cast (byte) print_msg::idx#1 ← (unumber)(number) 2
@@ -171,10 +173,12 @@ Simplifying constant integer cast 1
 Simplifying constant integer cast 2
 Simplifying constant integer cast 1
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 1
 Finalized unsigned number type (byte) 2
 Finalized unsigned number type (byte) 1
+Finalized unsigned number type (byte) 0
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (byte*) screen#0 = (byte*) screen#9 
 Alias (byte*) screen#1 = (byte*) screen#10 (byte*) screen#11 (byte*) screen#2 
@@ -196,7 +200,7 @@ Identical Phi Values (byte*) screen#23 (byte*) screen#18
 Identical Phi Values (byte*) screen#16 (byte*) screen#1
 Successful SSA optimization Pass2IdenticalPhiElimination
 Simple Condition (bool~) print_msg::$0 [15] if((byte) print_msg::idx#2==(byte) 1) goto print_msg::@1
-Simple Condition (bool~) print::$0 [32] if(*((byte*) print::msg#2)!=(byte) '@') goto print::@2
+Simple Condition (bool~) print::$0 [32] if((byte) 0!=*((byte*) print::msg#2)) goto print::@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte) print_msg::idx#0 = 1
 Constant (const byte) print_msg::idx#1 = 2
@@ -301,7 +305,7 @@ print: scope:[print]  from print_msg::@2
 print::@1: scope:[print]  from print print::@2
   [17] (byte*) screen#14 ← phi( print/(byte*) screen#18 print::@2/(byte*) screen#6 )
   [17] (byte*) print::msg#2 ← phi( print/(byte*) print::msg#0 print::@2/(byte*) print::msg#1 )
-  [18] if(*((byte*) print::msg#2)!=(byte) '@') goto print::@2
+  [18] if((byte) 0!=*((byte*) print::msg#2)) goto print::@2
   to:print::@return
 print::@return: scope:[print]  from print::@1
   [19] return 
@@ -467,10 +471,10 @@ print: {
     jmp b1
     // print::@1
   b1:
-    // [18] if(*((byte*) print::msg#2)!=(byte) '@') goto print::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [18] if((byte) 0!=*((byte*) print::msg#2)) goto print::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print::@return
@@ -500,7 +504,7 @@ print: {
 
 REGISTER UPLIFT POTENTIAL REGISTERS
 Statement [13] (byte*) print::msg#0 ← (byte*) print_msg::msg#3 [ screen#18 print::msg#0 ] ( main:2::print_msg:5 [ screen#18 print::msg#0 ] main:2::print_msg:7 [ screen#18 print::msg#0 ] ) always clobbers reg byte a 
-Statement [18] if(*((byte*) print::msg#2)!=(byte) '@') goto print::@2 [ screen#14 print::msg#2 ] ( main:2::print_msg:5::print:14 [ screen#14 print::msg#2 ] main:2::print_msg:7::print:14 [ screen#14 print::msg#2 ] ) always clobbers reg byte a reg byte y 
+Statement [18] if((byte) 0!=*((byte*) print::msg#2)) goto print::@2 [ screen#14 print::msg#2 ] ( main:2::print_msg:5::print:14 [ screen#14 print::msg#2 ] main:2::print_msg:7::print:14 [ screen#14 print::msg#2 ] ) always clobbers reg byte a reg byte y 
 Statement [20] *((byte*) screen#14) ← *((byte*) print::msg#2) [ screen#14 print::msg#2 ] ( main:2::print_msg:5::print:14 [ screen#14 print::msg#2 ] main:2::print_msg:7::print:14 [ screen#14 print::msg#2 ] ) always clobbers reg byte a reg byte y 
 Potential registers zp ZP_BYTE:2 [ print_msg::idx#2 ] : zp ZP_BYTE:2 , reg byte a , reg byte x , reg byte y , 
 Potential registers zp ZP_WORD:3 [ screen#18 screen#14 screen#6 ] : zp ZP_WORD:3 , 
@@ -634,10 +638,10 @@ print: {
     jmp b1
     // print::@1
   b1:
-    // [18] if(*((byte*) print::msg#2)!=(byte) '@') goto print::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [18] if((byte) 0!=*((byte*) print::msg#2)) goto print::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print::@return
@@ -835,11 +839,11 @@ print: {
     // [17] phi (byte*) print::msg#2 = (byte*) print::msg#0 [phi:print/print::@2->print::@1#1] -- register_copy 
     // print::@1
   b1:
-    // while(*msg!='@')
+    // while(*msg)
-    // [18] if(*((byte*) print::msg#2)!=(byte) '@') goto print::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [18] if((byte) 0!=*((byte*) print::msg#2)) goto print::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print::@return
     // }

src/test/ref/inline-string.asm

@@ -35,7 +35,7 @@ print: {
   b1:
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/inline-string.cfg

@@ -29,7 +29,7 @@ print: scope:[print]  from main main::@1 main::@2
 print::@1: scope:[print]  from print print::@2
   [12] (byte*) screen#12 ← phi( print/(byte*) screen#18 print::@2/(byte*) screen#5 )
   [12] (byte*) print::msg#4 ← phi( print/(byte*) print::msg#6 print::@2/(byte*) print::msg#3 )
-  [13] if(*((byte*) print::msg#4)!=(byte) '@') goto print::@2
+  [13] if((byte) 0!=*((byte*) print::msg#4)) goto print::@2
   to:print::@return
 print::@return: scope:[print]  from print::@1
   [14] return 

src/test/ref/inline-string.log

@@ -1,3 +1,4 @@
+Warning! Adding boolean cast to non-boolean condition *((byte*) print::msg)
 Culled Empty Block (label) print::@4
 Culled Empty Block (label) print::@3
 Culled Empty Block (label) print::@5
@@ -44,7 +45,7 @@ print: scope:[print]  from main main::@1 main::@2
 print::@1: scope:[print]  from print print::@2
   (byte*) screen#16 ← phi( print/(byte*) screen#18 print::@2/(byte*) screen#5 )
   (byte*) print::msg#4 ← phi( print/(byte*) print::msg#6 print::@2/(byte*) print::msg#3 )
-  (bool~) print::$0 ← *((byte*) print::msg#4) != (byte) '@'
+  (bool~) print::$0 ← (number) 0 != *((byte*) print::msg#4)
   if((bool~) print::$0) goto print::@2
   to:print::@return
 print::@2: scope:[print]  from print::@1
@@ -121,10 +122,15 @@ SYMBOL TABLE SSA
 (byte*) screen#8
 (byte*) screen#9
 
+Adding number conversion cast (unumber) 0 in (bool~) print::$0 ← (number) 0 != *((byte*) print::msg#4)
+Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) screen#4 ← (byte*)(number) $400
 Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (byte) 0
+Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (byte*) screen#0 = (byte*) screen#8 
 Alias (byte*) screen#1 = (byte*) screen#9 
 Alias (byte*) screen#10 = (byte*) screen#2 (byte*) screen#11 (byte*) screen#3 
@@ -139,7 +145,7 @@ Identical Phi Values (byte*) screen#1 (byte*) screen#12
 Identical Phi Values (byte*) screen#10 (byte*) screen#12
 Identical Phi Values (byte*) screen#14 (byte*) screen#10
 Successful SSA optimization Pass2IdenticalPhiElimination
-Simple Condition (bool~) print::$0 [22] if(*((byte*) print::msg#4)!=(byte) '@') goto print::@2
+Simple Condition (bool~) print::$0 [22] if((byte) 0!=*((byte*) print::msg#4)) goto print::@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte[]) msg1#0 = $0
 Constant (const byte[]) main::msg2#0 = main::$3
@@ -222,7 +228,7 @@ print: scope:[print]  from main main::@1 main::@2
 print::@1: scope:[print]  from print print::@2
   [12] (byte*) screen#12 ← phi( print/(byte*) screen#18 print::@2/(byte*) screen#5 )
   [12] (byte*) print::msg#4 ← phi( print/(byte*) print::msg#6 print::@2/(byte*) print::msg#3 )
-  [13] if(*((byte*) print::msg#4)!=(byte) '@') goto print::@2
+  [13] if((byte) 0!=*((byte*) print::msg#4)) goto print::@2
   to:print::@return
 print::@return: scope:[print]  from print::@1
   [14] return 
@@ -351,10 +357,10 @@ print: {
     jmp b1
     // print::@1
   b1:
-    // [13] if(*((byte*) print::msg#4)!=(byte) '@') goto print::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [13] if((byte) 0!=*((byte*) print::msg#4)) goto print::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print::@return
@@ -385,7 +391,7 @@ print: {
   .byte 0
 
 REGISTER UPLIFT POTENTIAL REGISTERS
-Statement [13] if(*((byte*) print::msg#4)!=(byte) '@') goto print::@2 [ screen#12 print::msg#4 ] ( main:2::print:5 [ screen#12 print::msg#4 ] main:2::print:7 [ screen#12 print::msg#4 ] main:2::print:9 [ screen#12 print::msg#4 ] ) always clobbers reg byte a reg byte y 
+Statement [13] if((byte) 0!=*((byte*) print::msg#4)) goto print::@2 [ screen#12 print::msg#4 ] ( main:2::print:5 [ screen#12 print::msg#4 ] main:2::print:7 [ screen#12 print::msg#4 ] main:2::print:9 [ screen#12 print::msg#4 ] ) always clobbers reg byte a reg byte y 
 Statement [15] *((byte*) screen#12) ← *((byte*) print::msg#4) [ screen#12 print::msg#4 ] ( main:2::print:5 [ screen#12 print::msg#4 ] main:2::print:7 [ screen#12 print::msg#4 ] main:2::print:9 [ screen#12 print::msg#4 ] ) always clobbers reg byte a reg byte y 
 Potential registers zp ZP_WORD:2 [ screen#18 screen#12 screen#5 ] : zp ZP_WORD:2 , 
 Potential registers zp ZP_WORD:4 [ print::msg#4 print::msg#6 print::msg#3 ] : zp ZP_WORD:4 , 
@@ -492,10 +498,10 @@ print: {
     jmp b1
     // print::@1
   b1:
-    // [13] if(*((byte*) print::msg#4)!=(byte) '@') goto print::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [13] if((byte) 0!=*((byte*) print::msg#4)) goto print::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print::@return
@@ -667,11 +673,11 @@ print: {
     // [12] phi (byte*) print::msg#4 = (byte*) print::msg#6 [phi:print/print::@2->print::@1#1] -- register_copy 
     // print::@1
   b1:
-    // while(*msg!='@')
+    // while(*msg)
-    // [13] if(*((byte*) print::msg#4)!=(byte) '@') goto print::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [13] if((byte) 0!=*((byte*) print::msg#4)) goto print::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (msg),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print::@return
     // }

src/test/ref/linegen.asm

@@ -249,7 +249,7 @@ print_str: {
   b1:
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     rts
   b2:

src/test/ref/linegen.cfg

@@ -179,7 +179,7 @@ print_str: scope:[print_str]  from main::@11 main::@14 main::@16 main::@18 main:
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [88] (byte*) print_char_cursor#2 ← phi( print_str/(byte*) print_char_cursor#86 print_str::@2/(byte*) print_char_cursor#1 )
   [88] (byte*) print_str::str#10 ← phi( print_str/(byte*) print_str::str#12 print_str::@2/(byte*) print_str::str#0 )
-  [89] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2
+  [89] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [90] return 

src/test/ref/linegen.log

@@ -8,6 +8,11 @@ Fixing pointer array-indexing *((word[$14]) main::lintab1 + (byte) main::i)
 Fixing pointer array-indexing *((word[$14]) main::lintab2 + (byte) main::i)
 Fixing pointer array-indexing *((word[$14]) main::lintab3 + (byte) main::i)
 Warning! Adding boolean cast to non-boolean condition *((byte*) strcpy::src)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_lines::str)
+Warning! Adding boolean cast to non-boolean condition (byte) print_str_lines::ch
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str::str)
+Warning! Adding boolean cast to non-boolean condition *((byte*) print_str_at::str)
+Warning! Adding boolean cast to non-boolean sub-expression (byte) print_str_lines::ch
 Identified constant variable (byte*) HEAP_TOP
 Culled Empty Block (label) @1
 Culled Empty Block (label) divr16u::@7
@@ -207,7 +212,7 @@ print_str: scope:[print_str]  from main::@10 main::@12 main::@14 main::@18 main:
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   (byte*) print_char_cursor#78 ← phi( print_str/(byte*) print_char_cursor#86 print_str::@2/(byte*) print_char_cursor#1 )
   (byte*) print_str::str#10 ← phi( print_str/(byte*) print_str::str#12 print_str::@2/(byte*) print_str::str#0 )
-  (bool~) print_str::$0 ← *((byte*) print_str::str#10) != (byte) '@'
+  (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#10)
   if((bool~) print_str::$0) goto print_str::@2
   to:print_str::@return
 print_str::@2: scope:[print_str]  from print_str::@1
@@ -1244,6 +1249,7 @@ Adding number conversion cast (unumber) 1 in (word~) divr16u::$7 ← (word) divr
 Adding number conversion cast (unumber) 1 in (number~) divr16u::$5 ← (word) divr16u::rem#7 | (number) 1
 Adding number conversion cast (unumber) divr16u::$5 in (number~) divr16u::$5 ← (word) divr16u::rem#7 | (unumber)(number) 1
 Adding number conversion cast (unumber) 0 in (bool~) memset::$0 ← (word) memset::num#1 > (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) print_str::$0 ← (number) 0 != *((byte*) print_str::str#10)
 Adding number conversion cast (unumber) $28 in (byte*~) print_ln::$0 ← (byte*) print_line_cursor#11 + (number) $28
 Adding number conversion cast (unumber) 4 in (byte~) print_byte::$0 ← (byte) print_byte::b#3 >> (number) 4
 Adding number conversion cast (unumber) $f in (number~) print_byte::$2 ← (byte) print_byte::b#4 & (number) $f
@@ -1310,6 +1316,7 @@ Simplifying constant integer cast 1
 Simplifying constant integer cast 1
 Simplifying constant integer cast 0
 Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast 0
 Simplifying constant integer cast $28
 Simplifying constant integer cast 4
 Simplifying constant integer cast $f
@@ -1350,6 +1357,7 @@ Finalized unsigned number type (byte) 1
 Finalized unsigned number type (byte) 1
 Finalized unsigned number type (byte) 1
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Finalized unsigned number type (byte) $28
 Finalized unsigned number type (byte) 4
 Finalized unsigned number type (byte) $f
@@ -1561,7 +1569,7 @@ Simple Condition (bool~) divr16u::$9 [19] if((word) divr16u::rem#6<(word) divr16
 Simple Condition (bool~) divr16u::$11 [26] if((byte) divr16u::i#1!=rangelast(0,$f)) goto divr16u::@1
 Simple Condition (bool~) memset::$1 [41] if((word) memset::num#0<=(byte) 0) goto memset::@1
 Simple Condition (bool~) memset::$4 [51] if((byte*) memset::dst#2!=(byte*) memset::end#0) goto memset::@5
-Simple Condition (bool~) print_str::$0 [65] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2
+Simple Condition (bool~) print_str::$0 [65] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2
 Simple Condition (bool~) print_ln::$1 [78] if((byte*) print_line_cursor#1<(byte*) print_char_cursor#11) goto print_ln::@1
 Simple Condition (bool~) main::$18 [194] if((byte) main::i#10<(byte) $14) goto main::@2
 Simple Condition (bool~) lin16u_gen::$5 [296] if((word) lin16u_gen::i#2<(word) lin16u_gen::length#3) goto lin16u_gen::@2
@@ -2124,7 +2132,7 @@ print_str: scope:[print_str]  from main::@11 main::@14 main::@16 main::@18 main:
 print_str::@1: scope:[print_str]  from print_str print_str::@2
   [88] (byte*) print_char_cursor#2 ← phi( print_str/(byte*) print_char_cursor#86 print_str::@2/(byte*) print_char_cursor#1 )
   [88] (byte*) print_str::str#10 ← phi( print_str/(byte*) print_str::str#12 print_str::@2/(byte*) print_str::str#0 )
-  [89] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2
+  [89] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2
   to:print_str::@return
 print_str::@return: scope:[print_str]  from print_str::@1
   [90] return 
@@ -3077,10 +3085,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [89] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [89] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -3498,7 +3506,7 @@ Statement [79] (byte~) print_byte::$2 ← (byte) print_byte::b#3 & (byte) $f [ p
 Statement [84] *((byte*) print_char_cursor#50) ← (byte) print_char::ch#2 [ print_char_cursor#50 ] ( main:2::print_byte:29::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:15::print_byte:71::print_char:78 [ print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:19::print_byte:71::print_char:78 [ print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:23::print_byte:71::print_char:78 [ print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:34::print_byte:71::print_char:78 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:39::print_byte:71::print_char:78 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:44::print_byte:71::print_char:78 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:52::print_byte:71::print_char:78 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:56::print_byte:71::print_char:78 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:60::print_byte:71::print_char:78 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:15::print_byte:73::print_char:78 [ print_byte::b#3 print_char_cursor#50 ] main:2::print_word:19::print_byte:73::print_char:78 [ print_byte::b#3 print_char_cursor#50 ] main:2::print_word:23::print_byte:73::print_char:78 [ print_byte::b#3 print_char_cursor#50 ] main:2::print_word:34::print_byte:73::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:39::print_byte:73::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:44::print_byte:73::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:52::print_byte:73::print_char:78 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:56::print_byte:73::print_char:78 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:60::print_byte:73::print_char:78 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_byte:29::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:15::print_byte:71::print_char:81 [ print_word::w#10 print_char_cursor#50 ] main:2::print_word:19::print_byte:71::print_char:81 [ print_word::w#10 print_char_cursor#50 ] main:2::print_word:23::print_byte:71::print_char:81 [ print_word::w#10 print_char_cursor#50 ] main:2::print_word:34::print_byte:71::print_char:81 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:39::print_byte:71::print_char:81 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:44::print_byte:71::print_char:81 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:52::print_byte:71::print_char:81 [ print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:56::print_byte:71::print_char:81 [ print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:60::print_byte:71::print_char:81 [ print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:15::print_byte:73::print_char:81 [ print_char_cursor#50 ] main:2::print_word:19::print_byte:73::print_char:81 [ print_char_cursor#50 ] main:2::print_word:23::print_byte:73::print_char:81 [ print_char_cursor#50 ] main:2::print_word:34::print_byte:73::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:39::print_byte:73::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:44::print_byte:73::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:52::print_byte:73::print_char:81 [ print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:56::print_byte:73::print_char:81 [ print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:60::print_byte:73::print_char:81 [ print_line_cursor#1 print_char_cursor#50 ] ) always clobbers reg byte y 
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:2 [ main::i#12 main::i#1 ]
 Removing always clobbered register reg byte y as potential for zp ZP_BYTE:7 [ print_byte::b#3 print_byte::b#2 print_byte::b#0 print_byte::b#1 ]
-Statement [89] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::print_str:13 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:17 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:21 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:31 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:36 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:41 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:50 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:54 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:58 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
+Statement [89] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::print_str:13 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:17 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:21 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:31 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:36 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:41 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:50 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:54 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:58 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
 Statement [91] *((byte*) print_char_cursor#2) ← *((byte*) print_str::str#10) [ print_char_cursor#2 print_str::str#10 ] ( main:2::print_str:13 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:17 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:21 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:31 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:36 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:41 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:50 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:54 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:58 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
 Statement [99] *((byte*) memset::dst#4) ← (const byte) memset::c#0 [ memset::dst#4 ] ( main:2::print_cls:11::memset:95 [ memset::dst#4 ] ) always clobbers reg byte a reg byte y 
 Statement [101] if((byte*) memset::dst#1!=(const byte*) memset::end#0) goto memset::@2 [ memset::dst#1 ] ( main:2::print_cls:11::memset:95 [ memset::dst#1 ] ) always clobbers reg byte a 
@@ -3537,7 +3545,7 @@ Statement [72] (byte) print_byte::b#1 ← < (word) print_word::w#10 [ print_char
 Statement [76] (byte~) print_byte::$0 ← (byte) print_byte::b#3 >> (byte) 4 [ print_byte::b#3 print_char_cursor#81 print_byte::$0 ] ( main:2::print_byte:29 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:15::print_byte:71 [ print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:19::print_byte:71 [ print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:23::print_byte:71 [ print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:34::print_byte:71 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:39::print_byte:71 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:44::print_byte:71 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:52::print_byte:71 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:56::print_byte:71 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:60::print_byte:71 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:15::print_byte:73 [ print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:19::print_byte:73 [ print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:23::print_byte:73 [ print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:34::print_byte:73 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:39::print_byte:73 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:44::print_byte:73 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:52::print_byte:73 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:56::print_byte:73 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] main:2::print_word:60::print_byte:73 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#81 print_byte::$0 ] ) always clobbers reg byte a 
 Statement [79] (byte~) print_byte::$2 ← (byte) print_byte::b#3 & (byte) $f [ print_char_cursor#11 print_byte::$2 ] ( main:2::print_byte:29 [ main::i#12 print_line_cursor#1 print_char_cursor#11 print_byte::$2 ] main:2::print_word:15::print_byte:71 [ print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:19::print_byte:71 [ print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:23::print_byte:71 [ print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:34::print_byte:71 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:39::print_byte:71 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:44::print_byte:71 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:52::print_byte:71 [ print_line_cursor#1 print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:56::print_byte:71 [ print_line_cursor#1 print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:60::print_byte:71 [ print_line_cursor#1 print_word::w#10 print_char_cursor#11 print_byte::$2 ] main:2::print_word:15::print_byte:73 [ print_char_cursor#11 print_byte::$2 ] main:2::print_word:19::print_byte:73 [ print_char_cursor#11 print_byte::$2 ] main:2::print_word:23::print_byte:73 [ print_char_cursor#11 print_byte::$2 ] main:2::print_word:34::print_byte:73 [ main::i#12 print_line_cursor#1 print_char_cursor#11 print_byte::$2 ] main:2::print_word:39::print_byte:73 [ main::i#12 print_line_cursor#1 print_char_cursor#11 print_byte::$2 ] main:2::print_word:44::print_byte:73 [ main::i#12 print_line_cursor#1 print_char_cursor#11 print_byte::$2 ] main:2::print_word:52::print_byte:73 [ print_line_cursor#1 print_char_cursor#11 print_byte::$2 ] main:2::print_word:56::print_byte:73 [ print_line_cursor#1 print_char_cursor#11 print_byte::$2 ] main:2::print_word:60::print_byte:73 [ print_line_cursor#1 print_char_cursor#11 print_byte::$2 ] ) always clobbers reg byte a 
 Statement [84] *((byte*) print_char_cursor#50) ← (byte) print_char::ch#2 [ print_char_cursor#50 ] ( main:2::print_byte:29::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:15::print_byte:71::print_char:78 [ print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:19::print_byte:71::print_char:78 [ print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:23::print_byte:71::print_char:78 [ print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:34::print_byte:71::print_char:78 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:39::print_byte:71::print_char:78 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:44::print_byte:71::print_char:78 [ main::i#12 print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:52::print_byte:71::print_char:78 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:56::print_byte:71::print_char:78 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:60::print_byte:71::print_char:78 [ print_line_cursor#1 print_word::w#10 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:15::print_byte:73::print_char:78 [ print_byte::b#3 print_char_cursor#50 ] main:2::print_word:19::print_byte:73::print_char:78 [ print_byte::b#3 print_char_cursor#50 ] main:2::print_word:23::print_byte:73::print_char:78 [ print_byte::b#3 print_char_cursor#50 ] main:2::print_word:34::print_byte:73::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:39::print_byte:73::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:44::print_byte:73::print_char:78 [ main::i#12 print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:52::print_byte:73::print_char:78 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:56::print_byte:73::print_char:78 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_word:60::print_byte:73::print_char:78 [ print_line_cursor#1 print_byte::b#3 print_char_cursor#50 ] main:2::print_byte:29::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:15::print_byte:71::print_char:81 [ print_word::w#10 print_char_cursor#50 ] main:2::print_word:19::print_byte:71::print_char:81 [ print_word::w#10 print_char_cursor#50 ] main:2::print_word:23::print_byte:71::print_char:81 [ print_word::w#10 print_char_cursor#50 ] main:2::print_word:34::print_byte:71::print_char:81 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:39::print_byte:71::print_char:81 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:44::print_byte:71::print_char:81 [ main::i#12 print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:52::print_byte:71::print_char:81 [ print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:56::print_byte:71::print_char:81 [ print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:60::print_byte:71::print_char:81 [ print_line_cursor#1 print_word::w#10 print_char_cursor#50 ] main:2::print_word:15::print_byte:73::print_char:81 [ print_char_cursor#50 ] main:2::print_word:19::print_byte:73::print_char:81 [ print_char_cursor#50 ] main:2::print_word:23::print_byte:73::print_char:81 [ print_char_cursor#50 ] main:2::print_word:34::print_byte:73::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:39::print_byte:73::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:44::print_byte:73::print_char:81 [ main::i#12 print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:52::print_byte:73::print_char:81 [ print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:56::print_byte:73::print_char:81 [ print_line_cursor#1 print_char_cursor#50 ] main:2::print_word:60::print_byte:73::print_char:81 [ print_line_cursor#1 print_char_cursor#50 ] ) always clobbers reg byte y 
-Statement [89] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::print_str:13 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:17 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:21 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:31 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:36 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:41 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:50 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:54 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:58 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
+Statement [89] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 [ print_char_cursor#2 print_str::str#10 ] ( main:2::print_str:13 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:17 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:21 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:31 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:36 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:41 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:50 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:54 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:58 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
 Statement [91] *((byte*) print_char_cursor#2) ← *((byte*) print_str::str#10) [ print_char_cursor#2 print_str::str#10 ] ( main:2::print_str:13 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:17 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:21 [ print_char_cursor#2 print_str::str#10 ] main:2::print_str:31 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:36 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:41 [ main::i#12 print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:50 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:54 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] main:2::print_str:58 [ print_line_cursor#1 print_char_cursor#2 print_str::str#10 ] ) always clobbers reg byte a reg byte y 
 Statement [99] *((byte*) memset::dst#4) ← (const byte) memset::c#0 [ memset::dst#4 ] ( main:2::print_cls:11::memset:95 [ memset::dst#4 ] ) always clobbers reg byte a reg byte y 
 Statement [101] if((byte*) memset::dst#1!=(const byte*) memset::end#0) goto memset::@2 [ memset::dst#1 ] ( main:2::print_cls:11::memset:95 [ memset::dst#1 ] ) always clobbers reg byte a 
@@ -4250,10 +4258,10 @@ print_str: {
     jmp b1
     // print_str::@1
   b1:
-    // [89] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [89] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     jmp breturn
     // print_str::@return
@@ -5552,11 +5560,11 @@ print_str: {
     // [88] phi (byte*) print_str::str#10 = (byte*) print_str::str#12 [phi:print_str/print_str::@2->print_str::@1#1] -- register_copy 
     // print_str::@1
   b1:
-    // while(*str!='@')
+    // while(*str)
-    // [89] if(*((byte*) print_str::str#10)!=(byte) '@') goto print_str::@2 -- _deref_pbuz1_neq_vbuc1_then_la1 
+    // [89] if((byte) 0!=*((byte*) print_str::str#10)) goto print_str::@2 -- vbuc1_neq__deref_pbuz1_then_la1 
     ldy #0
     lda (str),y
-    cmp #'@'
+    cmp #0
     bne b2
     // print_str::@return
     // }

src/test/ref/local-string.asm

@@ -4,16 +4,16 @@
 .pc = $80d "Program"
 main: {
     .label screen = $400
-    ldx #0
+    ldy #0
   b1:
-    lda msg,x
+    lda #0
-    cmp #'@'
+    cmp msg,y
     bne b2
     rts
   b2:
-    lda msg,x
+    lda msg,y
-    sta screen,x
+    sta screen,y
-    inx
+    iny
     jmp b1
     msg: .text "message 2 "
     .byte 0

src/test/ref/local-string.cfg

@@ -12,7 +12,7 @@ main: scope:[main]  from @1
   to:main::@1
 main::@1: scope:[main]  from main main::@2
   [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@2/(byte) main::i#1 )
-  [6] if(*((const byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2
+  [6] if((byte) 0!=*((const byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2
   to:main::@return
 main::@return: scope:[main]  from main::@1
   [7] return 

src/test/ref/local-string.log

@@ -1,3 +1,4 @@
+Warning! Adding boolean cast to non-boolean condition *((byte[]) main::msg + (byte) main::i)
 Identified constant variable (byte*) main::screen
 Culled Empty Block (label) main::@4
 Culled Empty Block (label) main::@3
@@ -14,7 +15,7 @@ main: scope:[main]  from @1
   to:main::@1
 main::@1: scope:[main]  from main main::@2
   (byte) main::i#2 ← phi( main/(byte) main::i#0 main::@2/(byte) main::i#1 )
-  (bool~) main::$0 ← *((byte[]) main::msg#0 + (byte) main::i#2) != (byte) '@'
+  (bool~) main::$0 ← (number) 0 != *((byte[]) main::msg#0 + (byte) main::i#2)
   if((bool~) main::$0) goto main::@2
   to:main::@return
 main::@2: scope:[main]  from main::@1
@@ -54,18 +55,21 @@ SYMBOL TABLE SSA
 (byte*) main::screen#0
 
 Adding number conversion cast (unumber) 0 in (byte) main::i#0 ← (number) 0
+Adding number conversion cast (unumber) 0 in (bool~) main::$0 ← (number) 0 != *((byte[]) main::msg#0 + (byte) main::i#2)
 Successful SSA optimization PassNAddNumberTypeConversions
 Inlining cast (byte*) main::screen#0 ← (byte*)(number) $400
 Inlining cast (byte) main::i#0 ← (unumber)(number) 0
 Successful SSA optimization Pass2InlineCast
 Simplifying constant pointer cast (byte*) 1024
 Simplifying constant integer cast 0
+Simplifying constant integer cast 0
 Successful SSA optimization PassNCastSimplification
 Finalized unsigned number type (byte) 0
+Finalized unsigned number type (byte) 0
 Successful SSA optimization PassNFinalizeNumberTypeConversions
 Alias (byte) main::i#2 = (byte) main::i#3 
 Successful SSA optimization Pass2AliasElimination
-Simple Condition (bool~) main::$0 [5] if(*((byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2
+Simple Condition (bool~) main::$0 [5] if((byte) 0!=*((byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2
 Successful SSA optimization Pass2ConditionalJumpSimplification
 Constant (const byte*) main::screen#0 = (byte*) 1024
 Constant (const byte[]) main::msg#0 = main::$1
@@ -107,7 +111,7 @@ main: scope:[main]  from @1
   to:main::@1
 main::@1: scope:[main]  from main main::@2
   [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@2/(byte) main::i#1 )
-  [6] if(*((const byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2
+  [6] if((byte) 0!=*((const byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2
   to:main::@return
 main::@return: scope:[main]  from main::@1
   [7] return 
@@ -169,8 +173,8 @@ main: {
     jmp b1
     // main::@1
   b1:
-    // [6] if(*((const byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2 -- pbuc1_derefidx_vbuz1_neq_vbuc2_then_la1 
+    // [6] if((byte) 0!=*((const byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1 
-    lda #'@'
+    lda #0
     ldy i
     cmp msg,y
     bne b2
@@ -197,10 +201,10 @@ main: {
   // File Data
 
 REGISTER UPLIFT POTENTIAL REGISTERS
-Statement [6] if(*((const byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2 [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
+Statement [6] if((byte) 0!=*((const byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2 [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
 Removing always clobbered register reg byte a as potential for zp ZP_BYTE:2 [ main::i#2 main::i#1 ]
 Statement [8] *((const byte*) main::screen#0 + (byte) main::i#2) ← *((const byte[]) main::msg#0 + (byte) main::i#2) [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
-Statement [6] if(*((const byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2 [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
+Statement [6] if((byte) 0!=*((const byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2 [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
 Statement [8] *((const byte*) main::screen#0 + (byte) main::i#2) ← *((const byte[]) main::msg#0 + (byte) main::i#2) [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
 Potential registers zp ZP_BYTE:2 [ main::i#2 main::i#1 ] : zp ZP_BYTE:2 , reg byte x , reg byte y , 
 
@@ -208,7 +212,7 @@ REGISTER UPLIFT SCOPES
 Uplift Scope [main] 40.33: zp ZP_BYTE:2 [ main::i#2 main::i#1 ] 
 Uplift Scope [] 
 
-Uplifting [main] best 333 combination reg byte x [ main::i#2 main::i#1 ] 
+Uplifting [main] best 333 combination reg byte y [ main::i#2 main::i#1 ] 
 Uplifting [] best 333 combination 
 
 ASSEMBLER BEFORE OPTIMIZATION
@@ -240,14 +244,14 @@ main: {
     .label screen = $400
     // [5] phi from main to main::@1 [phi:main->main::@1]
   b1_from_main:
-    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
+    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
-    ldx #0
+    ldy #0
     jmp b1
     // main::@1
   b1:
-    // [6] if(*((const byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2 -- pbuc1_derefidx_vbuxx_neq_vbuc2_then_la1 
+    // [6] if((byte) 0!=*((const byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda msg,x
+    lda #0
-    cmp #'@'
+    cmp msg,y
     bne b2
     jmp breturn
     // main::@return
@@ -256,11 +260,11 @@ main: {
     rts
     // main::@2
   b2:
-    // [8] *((const byte*) main::screen#0 + (byte) main::i#2) ← *((const byte[]) main::msg#0 + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuxx 
+    // [8] *((const byte*) main::screen#0 + (byte) main::i#2) ← *((const byte[]) main::msg#0 + (byte) main::i#2) -- pbuc1_derefidx_vbuyy=pbuc2_derefidx_vbuyy 
-    lda msg,x
+    lda msg,y
-    sta screen,x
+    sta screen,y
-    // [9] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
+    // [9] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuyy=_inc_vbuyy 
-    inx
+    iny
     // [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
   b1_from_b2:
     // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
@@ -301,14 +305,14 @@ FINAL SYMBOL TABLE
 (label) main::@2
 (label) main::@return
 (byte) main::i
-(byte) main::i#1 reg byte x 22.0
+(byte) main::i#1 reg byte y 22.0
-(byte) main::i#2 reg byte x 18.333333333333332
+(byte) main::i#2 reg byte y 18.333333333333332
 (byte[]) main::msg
 (const byte[]) main::msg#0 msg = (string) "message 2 "
 (byte*) main::screen
 (const byte*) main::screen#0 screen = (byte*) 1024
 
-reg byte x [ main::i#2 main::i#1 ]
+reg byte y [ main::i#2 main::i#1 ]
 
 
 FINAL ASSEMBLER
@@ -332,14 +336,14 @@ Score: 261
 main: {
     .label screen = $400
     // [5] phi from main to main::@1 [phi:main->main::@1]
-    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
+    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
-    ldx #0
+    ldy #0
     // main::@1
   b1:
-    // while(msg[i]!='@')
+    // while(msg[i])
-    // [6] if(*((const byte[]) main::msg#0 + (byte) main::i#2)!=(byte) '@') goto main::@2 -- pbuc1_derefidx_vbuxx_neq_vbuc2_then_la1 
+    // [6] if((byte) 0!=*((const byte[]) main::msg#0 + (byte) main::i#2)) goto main::@2 -- vbuc1_neq_pbuc2_derefidx_vbuyy_then_la1 
-    lda msg,x
+    lda #0
-    cmp #'@'
+    cmp msg,y
     bne b2
     // main::@return
     // }
@@ -348,12 +352,12 @@ main: {
     // main::@2
   b2:
     // screen[i++] = msg[i]
-    // [8] *((const byte*) main::screen#0 + (byte) main::i#2) ← *((const byte[]) main::msg#0 + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuxx 
+    // [8] *((const byte*) main::screen#0 + (byte) main::i#2) ← *((const byte[]) main::msg#0 + (byte) main::i#2) -- pbuc1_derefidx_vbuyy=pbuc2_derefidx_vbuyy 
-    lda msg,x
+    lda msg,y
-    sta screen,x
+    sta screen,y
     // screen[i++] = msg[i];
-    // [9] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
+    // [9] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuyy=_inc_vbuyy 
-    inx
+    iny
     // [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
     // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
     jmp b1

src/test/ref/local-string.sym

@@ -6,11 +6,11 @@
 (label) main::@2
 (label) main::@return
 (byte) main::i
-(byte) main::i#1 reg byte x 22.0
+(byte) main::i#1 reg byte y 22.0
-(byte) main::i#2 reg byte x 18.333333333333332
+(byte) main::i#2 reg byte y 18.333333333333332
 (byte[]) main::msg
 (const byte[]) main::msg#0 msg = (string) "message 2 "
 (byte*) main::screen
 (const byte*) main::screen#0 screen = (byte*) 1024
 
-reg byte x [ main::i#2 main::i#1 ]
+reg byte y [ main::i#2 main::i#1 ]

src/test/ref/loop-break-continue.asm

@@ -1,5 +1,5 @@
 // Illustrates both break & continue statements in a loop
-// Prints a message ending at '@' skipping all spaces
+// Prints a message ending at NUL skipping all spaces
 .pc = $801 "Basic"
 :BasicUpstart(main)
 .pc = $80d "Program"
@@ -12,7 +12,7 @@ main: {
     ldx #0
   b1:
     lda str,x
-    cmp #'@'
+    cmp #0
     bne b2
   breturn:
     rts

src/test/ref/loop-break-continue.cfg

@@ -13,7 +13,7 @@ main: scope:[main]  from @1
 main::@1: scope:[main]  from main main::@4
   [5] (byte*) main::screen#2 ← phi( main/(byte*) 1024 main::@4/(byte*) main::screen#5 )
   [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@4/(byte) main::i#1 )
-  [6] if(*((const byte[]) main::str#0 + (byte) main::i#2)!=(byte) '@') goto main::@2
+  [6] if(*((const byte[]) main::str#0 + (byte) main::i#2)!=(byte) 0) goto main::@2
   to:main::@return
 main::@return: scope:[main]  from main::@1 main::@4
   [7] return