Fixed test data

2025-01-27 06:34:19 +00:00 · 2017-07-31 23:37:15 +02:00 · 2017-07-31 23:37:15 +02:00 · 4a9a3d54f5
commit 4a9a3d54f5
parent 18bbde8a44
31 changed files with 585 additions and 226 deletions
--- a/src/main/java/dk/camelot64/kickc/test/ref/fibmem.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/fibmem.asm
@ -13,8 +13,10 @@ B1:
  sta 3
  ldx 2
  lda 4353,x
+  sta 4
+  lda 3
  clc
-  adc 3
+  adc 4
  sta 3
  lda 3
  ldx 2
--- a/src/main/java/dk/camelot64/kickc/test/ref/fibmem.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/fibmem.log
@ -443,13 +443,23 @@ zp byte:2 [ i#2 i#1 ]
 zp byte:3 [ $1 $4 ]
 zp byte:4 [ $3 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp byte:3 to zp byte:3
-Re-allocated ZP register from zp byte:4 to zp byte:4
-Uplifting of variable (byte~) $3 to A
+Uplifting max weight 33.0 live range equivalence class zp byte:3 [ $1 $4 ]
+Error! Alive variable $1 register reg byte a clobbered by the ASM generated by statement [4] $3 ← 4353 *idx i#2
+  ldx 2
+  lda 4353,x
+  sta 4
+
+Uplift to reg byte a resulted in clobber.
+Error! Alive variable $1 register reg byte x clobbered by the ASM generated by statement [4] $3 ← 4353 *idx i#2
+  ldx 2
+  lda 4353,x
+  sta 4
+
+Uplift to reg byte x resulted in clobber.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
 (byte~) $1 zp byte:3 11.0
-(byte~) $3 reg byte a 22.0
+(byte~) $3 zp byte:4 22.0
 (byte~) $4 zp byte:3 22.0
 (byte[15]) fibs
 (byte) i
@ -481,12 +491,14 @@ B1:
  ldx 2
  lda 4352,x
  sta 3
-  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  aby=cowo1_staridx_zpby1
+  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  zpby1=cowo1_staridx_zpby2
  ldx 2
  lda 4353,x
-  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_aby
+  sta 4
+  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_zpby2
+  lda 3
  clc
-  adc 3
+  adc 4
  sta 3
  // [6] *((word) 4354 + (byte) i#2) ← (byte~) $4 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
  lda 3
@ -524,12 +536,14 @@ B1:
  ldx 2
  lda 4352,x
  sta 3
-  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  aby=cowo1_staridx_zpby1
+  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  zpby1=cowo1_staridx_zpby2
  ldx 2
  lda 4353,x
-  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_aby
+  sta 4
+  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_zpby2
+  lda 3
  clc
-  adc 3
+  adc 4
  sta 3
  // [6] *((word) 4354 + (byte) i#2) ← (byte~) $4 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
  lda 3
@ -564,12 +578,14 @@ B1:
  ldx 2
  lda 4352,x
  sta 3
-  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  aby=cowo1_staridx_zpby1
+  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  zpby1=cowo1_staridx_zpby2
  ldx 2
  lda 4353,x
-  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_aby
+  sta 4
+  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_zpby2
+  lda 3
  clc
-  adc 3
+  adc 4
  sta 3
  // [6] *((word) 4354 + (byte) i#2) ← (byte~) $4 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
  lda 3
@ -585,7 +601,7 @@ BEND:

 FINAL SYMBOL TABLE
 (byte~) $1 zp byte:3 11.0
-(byte~) $3 reg byte a 22.0
+(byte~) $3 zp byte:4 22.0
 (byte~) $4 zp byte:3 22.0
 (label) @1
 (label) @BEGIN
@ -618,12 +634,14 @@ B1:
  ldx 2
  lda 4352,x
  sta 3
-  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  aby=cowo1_staridx_zpby1
+  // [4] (byte~) $3 ← (word) 4353 *idx (byte) i#2 [ i#2 $1 $3 ]  //  zpby1=cowo1_staridx_zpby2
  ldx 2
  lda 4353,x
-  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_aby
+  sta 4
+  // [5] (byte~) $4 ← (byte~) $1 + (byte~) $3 [ i#2 $4 ]  //  zpby1=zpby1_plus_zpby2
+  lda 3
  clc
-  adc 3
+  adc 4
  sta 3
  // [6] *((word) 4354 + (byte) i#2) ← (byte~) $4 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
  lda 3
--- a/src/main/java/dk/camelot64/kickc/test/ref/fibmem.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/fibmem.sym
@ -1,5 +1,5 @@
 (byte~) $1 zp byte:3 11.0
-(byte~) $3 reg byte a 22.0
+(byte~) $3 zp byte:4 22.0
 (byte~) $4 zp byte:3 22.0
 (label) @1
 (label) @BEGIN
--- a/src/main/java/dk/camelot64/kickc/test/ref/flipper-rex2.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/flipper-rex2.asm
@ -14,6 +14,8 @@ main__B3_from_B3:
 main__B3_from_B6:
 main__B3:
  lda 53266
+  sta 14
+  lda 14
  cmp #254
  bne main__B3_from_B3
 main__B4:
--- a/src/main/java/dk/camelot64/kickc/test/ref/flipper-rex2.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/flipper-rex2.log
@ -4148,23 +4148,25 @@ zp byte:16 [ plot::$3 ]
 zp byte:17 [ flip::$0 ]
 zp byte:18 [ flip::$4 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp ptr byte:3 to zp ptr byte:3
-Re-allocated ZP register from zp byte:5 to zp byte:5
-Re-allocated ZP register from zp byte:6 to zp byte:6
-Re-allocated ZP register from zp byte:7 to zp byte:7
-Re-allocated ZP register from zp byte:8 to zp byte:8
-Re-allocated ZP register from zp byte:9 to zp byte:9
-Re-allocated ZP register from zp byte:10 to zp byte:10
-Re-allocated ZP register from zp byte:11 to zp byte:11
-Re-allocated ZP register from zp byte:12 to zp byte:12
-Re-allocated ZP register from zp byte:13 to zp byte:13
-Re-allocated ZP register from zp byte:14 to zp byte:14
-Re-allocated ZP register from zp byte:15 to zp byte:15
-Re-allocated ZP register from zp byte:16 to zp byte:16
-Re-allocated ZP register from zp byte:17 to zp byte:17
-Re-allocated ZP register from zp byte:18 to zp byte:18
-Uplifting of variable (byte~) main::$1 to A
+Uplifting max weight 2252.25 live range equivalence class zp byte:7 [ plot::x#2 plot::x#1 ]
+Error! Alive variable plot::x#2 register reg byte a clobbered by the ASM generated by statement [15] plot::$3 ← 4096 *idx plot::i#2
+  ldx 6
+  lda 4096,x
+  sta 16
+
+Error! Alive variable plot::x#2 register reg byte a clobbered by the ASM generated by statement [16] *(plot::line#2 + plot::x#2) ← plot::$3
+  tay
+  lda 16
+  sta (3),y
+
+Uplift to reg byte a resulted in clobber.
+Error! Alive variable plot::x#2 register reg byte x clobbered by the ASM generated by statement [15] plot::$3 ← 4096 *idx plot::i#2
+  ldx 6
+  lda 4096,x
+  sta 16
+
+Uplift to reg byte x resulted in clobber.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
 (byte*) RASTER
 (byte[1000]) SCREEN
@ -4192,7 +4194,7 @@ REGISTER UPLIFTING
 (byte) flip::srcIdx#2 zp byte:9 1034.6666666666667
 (byte) flip::srcIdx#3 zp byte:9 202.0
 (void()) main()
-(byte~) main::$1 reg byte a 2002.0
+(byte~) main::$1 zp byte:14 2002.0
 (byte~) main::$3 zp byte:15 2002.0
 (byte) main::c
 (byte) main::c#1 zp byte:2 151.5
@ -4267,9 +4269,11 @@ main__B3_from_B6:
  // (byte) main::c#2 = (byte) main::c#1  // register copy zp byte:2
  jmp main__B3
 main__B3:
-  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  aby=_star_cowo1
+  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  zpby1=_star_cowo1
  lda 53266
-  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  aby_neq_coby1_then_la1
+  sta 14
+  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  zpby1_neq_coby1_then_la1
+  lda 14
  cmp #254
  bne main__B3_from_B3
  jmp main__B4
@ -4515,9 +4519,11 @@ main__B3_from_B3:
 main__B3_from_B6:
  // (byte) main::c#2 = (byte) main::c#1  // register copy zp byte:2
 main__B3:
-  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  aby=_star_cowo1
+  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  zpby1=_star_cowo1
  lda 53266
-  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  aby_neq_coby1_then_la1
+  sta 14
+  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  zpby1_neq_coby1_then_la1
+  lda 14
  cmp #254
  bne main__B3_from_B3
 main__B4:
@ -4733,9 +4739,11 @@ main__B3_from_B3:
 main__B3_from_B6:
  // (byte) main::c#2 = (byte) main::c#1  // register copy zp byte:2
 main__B3:
-  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  aby=_star_cowo1
+  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  zpby1=_star_cowo1
  lda 53266
-  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  aby_neq_coby1_then_la1
+  sta 14
+  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  zpby1_neq_coby1_then_la1
+  lda 14
  cmp #254
  bne main__B3_from_B3
 main__B4:
@ -4938,9 +4946,11 @@ main__B3_from_B3:
 main__B3_from_B6:
  // (byte) main::c#2 = (byte) main::c#1  // register copy zp byte:2
 main__B3:
-  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  aby=_star_cowo1
+  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  zpby1=_star_cowo1
  lda 53266
-  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  aby_neq_coby1_then_la1
+  sta 14
+  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  zpby1_neq_coby1_then_la1
+  lda 14
  cmp #254
  bne main__B3_from_B3
 main__B4:
@ -5156,7 +5166,7 @@ FINAL SYMBOL TABLE
 (byte) flip::srcIdx#2 zp byte:9 1034.6666666666667
 (byte) flip::srcIdx#3 zp byte:9 202.0
 (void()) main()
-(byte~) main::$1 reg byte a 2002.0
+(byte~) main::$1 zp byte:14 2002.0
 (byte~) main::$3 zp byte:15 2002.0
 (label) main::@10
 (label) main::@11
@ -5220,9 +5230,11 @@ main__B3_from_B3:
 main__B3_from_B6:
  // (byte) main::c#2 = (byte) main::c#1  // register copy zp byte:2
 main__B3:
-  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  aby=_star_cowo1
+  // [3] (byte~) main::$1 ← * (word) 53266 [ main::$1 main::c#2 ]  //  zpby1=_star_cowo1
  lda 53266
-  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  aby_neq_coby1_then_la1
+  sta 14
+  // [4] if((byte~) main::$1!=(byte) 254) goto main::@3 [ main::c#2 ]  //  zpby1_neq_coby1_then_la1
+  lda 14
  cmp #254
  bne main__B3_from_B3
 main__B4:
--- a/src/main/java/dk/camelot64/kickc/test/ref/flipper-rex2.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/flipper-rex2.sym
@ -31,7 +31,7 @@
 (byte) flip::srcIdx#2 zp byte:9 1034.6666666666667
 (byte) flip::srcIdx#3 zp byte:9 202.0
 (void()) main()
-(byte~) main::$1 reg byte a 2002.0
+(byte~) main::$1 zp byte:14 2002.0
 (byte~) main::$3 zp byte:15 2002.0
 (label) main::@10
 (label) main::@11
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopmin.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopmin.asm
@ -21,6 +21,6 @@ B2:
  lda 3
  clc
  adc 2
-B3_from_B2:
  sta 3
+B3_from_B2:
  jmp B3
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopmin.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopmin.log
@ -384,15 +384,27 @@ VARIABLE REGISTER WEIGHTS
 zp byte:2 [ i#2 i#1 ]
 zp byte:3 [ s#2 s#4 s#1 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp byte:3 to zp byte:3
-Uplifting of variable (byte) s#1 to A
+Uplifting max weight 49.5 live range equivalence class zp byte:3 [ s#2 s#4 s#1 ]
+Error! Alive variable s#2 register reg byte a clobbered by the ASM generated by statement [1] if(i#2>5) goto @2
+  lda 2
+  cmp #5
+  beq !+
+  bcs B2
+!:
+
+Error! Alive variable s#4 register reg byte a clobbered by the ASM generated by statement [4] if(i#1>0) goto @1
+  lda 2
+  bne B1_from_B3
+
+Uplift to reg byte a resulted in clobber.
+Uplift to reg byte x succesfull.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
 (byte) i
 (byte) i#1 zp byte:2 16.5
 (byte) i#2 zp byte:2 11.0
 (byte) s
-(byte) s#1 reg byte a 22.0
+(byte) s#1 zp byte:3 22.0
 (byte) s#2 zp byte:3 16.5
 (byte) s#4 zp byte:3 11.0

@ -432,13 +444,13 @@ B3:
  jmp BEND
 BEND:
 B2:
-  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  aby=zpby1_plus_zpby2
+  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  zpby1=zpby1_plus_zpby2
  lda 3
  clc
  adc 2
-B3_from_B2:
-  // (byte) s#4 = (byte) s#1  // zpby1=aby
  sta 3
+B3_from_B2:
+  // (byte) s#4 = (byte) s#1  // register copy zp byte:3
  jmp B3

 Removing instruction jmp B1
@ -475,13 +487,13 @@ B3:
  bne B1_from_B3
 BEND:
 B2:
-  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  aby=zpby1_plus_zpby2
+  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  zpby1=zpby1_plus_zpby2
  lda 3
  clc
  adc 2
-B3_from_B2:
-  // (byte) s#4 = (byte) s#1  // zpby1=aby
  sta 3
+B3_from_B2:
+  // (byte) s#4 = (byte) s#1  // register copy zp byte:3
  jmp B3

 Removing instruction jmp B1
@ -515,13 +527,13 @@ B3:
  bne B1_from_B3
 BEND:
 B2:
-  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  aby=zpby1_plus_zpby2
+  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  zpby1=zpby1_plus_zpby2
  lda 3
  clc
  adc 2
-B3_from_B2:
-  // (byte) s#4 = (byte) s#1  // zpby1=aby
  sta 3
+B3_from_B2:
+  // (byte) s#4 = (byte) s#1  // register copy zp byte:3
  jmp B3

 FINAL SYMBOL TABLE
@ -534,7 +546,7 @@ FINAL SYMBOL TABLE
 (byte) i#1 zp byte:2 16.5
 (byte) i#2 zp byte:2 11.0
 (byte) s
-(byte) s#1 reg byte a 22.0
+(byte) s#1 zp byte:3 22.0
 (byte) s#2 zp byte:3 16.5
 (byte) s#4 zp byte:3 11.0

@ -570,12 +582,12 @@ B3:
  bne B1_from_B3
 BEND:
 B2:
-  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  aby=zpby1_plus_zpby2
+  // [5] (byte) s#1 ← (byte) s#2 + (byte) i#2 [ i#2 s#1 ]  //  zpby1=zpby1_plus_zpby2
  lda 3
  clc
  adc 2
-B3_from_B2:
-  // (byte) s#4 = (byte) s#1  // zpby1=aby
  sta 3
+B3_from_B2:
+  // (byte) s#4 = (byte) s#1  // register copy zp byte:3
  jmp B3

--- a/src/main/java/dk/camelot64/kickc/test/ref/loopmin.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopmin.sym
@ -7,7 +7,7 @@
 (byte) i#1 zp byte:2 16.5
 (byte) i#2 zp byte:2 11.0
 (byte) s
-(byte) s#1 reg byte a 22.0
+(byte) s#1 zp byte:3 22.0
 (byte) s#2 zp byte:3 16.5
 (byte) s#4 zp byte:3 11.0

--- a/src/main/java/dk/camelot64/kickc/test/ref/loopnest.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopnest.asm
@ -18,16 +18,12 @@ nest:
 nest__B1_from_nest:
  lda #100
  sta 3
-  jmp nest__B1
 nest__B1_from_B1:
-  sta 3
 nest__B1:
  lda 3
  sta 1024
+  dec 3
  lda 3
-  sec
-  sbc #1
-  cmp #0
  bne nest__B1_from_B1
 nest__Breturn:
  rts
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopnest.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopnest.log
@ -734,9 +734,10 @@ VARIABLE REGISTER WEIGHTS
 zp byte:2 [ main::i#2 main::i#1 ]
 zp byte:3 [ nest::j#2 nest::j#1 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp byte:3 to zp byte:3
-Uplifting of variable (byte) nest::j#1 to A
+Uplifting max weight 303.0 live range equivalence class zp byte:3 [ nest::j#2 nest::j#1 ]
+Uplift to reg byte a succesfull.
+Uplift to reg byte x succesfull.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
 (byte*) SCREEN
 (void()) main()
@ -745,7 +746,7 @@ REGISTER UPLIFTING
 (byte) main::i#2 zp byte:2 3.142857142857143
 (void()) nest()
 (byte) nest::j
-(byte) nest::j#1 reg byte a 151.5
+(byte) nest::j#1 zp byte:3 151.5
 (byte) nest::j#2 zp byte:3 151.5

 zp byte:2 [ main::i#2 main::i#1 ]
@ -784,19 +785,16 @@ nest__B1_from_nest:
  sta 3
  jmp nest__B1
 nest__B1_from_B1:
-  // (byte) nest::j#2 = (byte) nest::j#1  // zpby1=aby
-  sta 3
+  // (byte) nest::j#2 = (byte) nest::j#1  // register copy zp byte:3
  jmp nest__B1
 nest__B1:
  // [7] *((word) 1024) ← (byte) nest::j#2 [ main::i#2 nest::j#2 ]  //  _star_cowo1=zpby1
  lda 3
  sta 1024
-  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  aby=_dec_zpby1
+  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  zpby1=_dec_zpby1
+  dec 3
+  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  zpby1_gt_0_then_la1
  lda 3
-  sec
-  sbc #1
-  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest__B1_from_B1
  jmp nest__Breturn
 nest__Breturn:
@ -838,23 +836,21 @@ nest__B1_from_nest:
  sta 3
  jmp nest__B1
 nest__B1_from_B1:
-  // (byte) nest::j#2 = (byte) nest::j#1  // zpby1=aby
-  sta 3
+  // (byte) nest::j#2 = (byte) nest::j#1  // register copy zp byte:3
 nest__B1:
  // [7] *((word) 1024) ← (byte) nest::j#2 [ main::i#2 nest::j#2 ]  //  _star_cowo1=zpby1
  lda 3
  sta 1024
-  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  aby=_dec_zpby1
+  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  zpby1=_dec_zpby1
+  dec 3
+  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  zpby1_gt_0_then_la1
  lda 3
-  sec
-  sbc #1
-  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest__B1_from_B1
 nest__Breturn:
  rts

 Removing instruction jmp main__B1
+Removing instruction jmp nest__B1
 Succesful ASM optimization Pass5NextJumpElimination
 ASSEMBLER
 BBEGIN:
@ -882,20 +878,16 @@ nest__B1_from_nest:
  // (byte) nest::j#2 = (byte) 100  // zpby1=coby1
  lda #100
  sta 3
-  jmp nest__B1
 nest__B1_from_B1:
-  // (byte) nest::j#2 = (byte) nest::j#1  // zpby1=aby
-  sta 3
+  // (byte) nest::j#2 = (byte) nest::j#1  // register copy zp byte:3
 nest__B1:
  // [7] *((word) 1024) ← (byte) nest::j#2 [ main::i#2 nest::j#2 ]  //  _star_cowo1=zpby1
  lda 3
  sta 1024
-  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  aby=_dec_zpby1
+  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  zpby1=_dec_zpby1
+  dec 3
+  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  zpby1_gt_0_then_la1
  lda 3
-  sec
-  sbc #1
-  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest__B1_from_B1
 nest__Breturn:
  rts
@ -915,7 +907,7 @@ FINAL SYMBOL TABLE
 (label) nest::@1
 (label) nest::@return
 (byte) nest::j
-(byte) nest::j#1 reg byte a 151.5
+(byte) nest::j#1 zp byte:3 151.5
 (byte) nest::j#2 zp byte:3 151.5

 zp byte:2 [ main::i#2 main::i#1 ]
@ -947,20 +939,16 @@ nest__B1_from_nest:
  // (byte) nest::j#2 = (byte) 100  // zpby1=coby1
  lda #100
  sta 3
-  jmp nest__B1
 nest__B1_from_B1:
-  // (byte) nest::j#2 = (byte) nest::j#1  // zpby1=aby
-  sta 3
+  // (byte) nest::j#2 = (byte) nest::j#1  // register copy zp byte:3
 nest__B1:
  // [7] *((word) 1024) ← (byte) nest::j#2 [ main::i#2 nest::j#2 ]  //  _star_cowo1=zpby1
  lda 3
  sta 1024
-  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  aby=_dec_zpby1
+  // [8] (byte) nest::j#1 ← -- (byte) nest::j#2 [ main::i#2 nest::j#1 ]  //  zpby1=_dec_zpby1
+  dec 3
+  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  zpby1_gt_0_then_la1
  lda 3
-  sec
-  sbc #1
-  // [9] if((byte) nest::j#1>(byte) 0) goto nest::@1 [ main::i#2 nest::j#1 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest__B1_from_B1
 nest__Breturn:
  rts
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopnest.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopnest.sym
@ -12,7 +12,7 @@
 (label) nest::@1
 (label) nest::@return
 (byte) nest::j
-(byte) nest::j#1 reg byte a 151.5
+(byte) nest::j#1 zp byte:3 151.5
 (byte) nest::j#2 zp byte:3 151.5

 zp byte:2 [ main::i#2 main::i#1 ]
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopnest2.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopnest2.asm
@ -54,16 +54,12 @@ nest2__B1:
 nest2__B2_from_B1:
  lda #100
  sta 7
-  jmp nest2__B2
 nest2__B2_from_B2:
-  sta 7
 nest2__B2:
  lda 7
  sta 1024
+  dec 7
  lda 7
-  sec
-  sbc #1
-  cmp #0
  bne nest2__B2_from_B2
 nest2__B3:
  dec 6
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopnest2.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopnest2.log
@ -1849,13 +1849,10 @@ zp byte:5 [ nest1::j#2 nest1::j#1 ]
 zp byte:6 [ nest2::i#2 nest2::i#1 ]
 zp byte:7 [ nest2::j#2 nest2::j#1 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp byte:3 to zp byte:3
-Re-allocated ZP register from zp byte:4 to zp byte:4
-Re-allocated ZP register from zp byte:5 to zp byte:5
-Re-allocated ZP register from zp byte:6 to zp byte:6
-Re-allocated ZP register from zp byte:7 to zp byte:7
-Uplifting of variable (byte) nest2::j#1 to A
+Uplifting max weight 3000003.0 live range equivalence class zp byte:7 [ nest2::j#2 nest2::j#1 ]
+Uplift to reg byte a succesfull.
+Uplift to reg byte x succesfull.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
 (byte*) SCREEN
 (void()) main()
@ -1877,7 +1874,7 @@ REGISTER UPLIFTING
 (byte) nest2::i#1 zp byte:6 150001.5
 (byte) nest2::i#2 zp byte:6 40000.4
 (byte) nest2::j
-(byte) nest2::j#1 reg byte a 1500001.5
+(byte) nest2::j#1 zp byte:7 1500001.5
 (byte) nest2::j#2 zp byte:7 1500001.5

 zp byte:2 [ main::i#2 main::i#1 ]
@ -1982,19 +1979,16 @@ nest2__B2_from_B1:
  sta 7
  jmp nest2__B2
 nest2__B2_from_B2:
-  // (byte) nest2::j#2 = (byte) nest2::j#1  // zpby1=aby
-  sta 7
+  // (byte) nest2::j#2 = (byte) nest2::j#1  // register copy zp byte:7
  jmp nest2__B2
 nest2__B2:
  // [19] *((word) 1024) ← (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#2 nest2::i#2 ]  //  _star_cowo1=zpby1
  lda 7
  sta 1024
-  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby=_dec_zpby1
+  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1=_dec_zpby1
+  dec 7
+  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1_gt_0_then_la1
  lda 7
-  sec
-  sbc #1
-  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest2__B2_from_B2
  jmp nest2__B3
 nest2__B3:
@ -2106,18 +2100,15 @@ nest2__B2_from_B1:
  sta 7
  jmp nest2__B2
 nest2__B2_from_B2:
-  // (byte) nest2::j#2 = (byte) nest2::j#1  // zpby1=aby
-  sta 7
+  // (byte) nest2::j#2 = (byte) nest2::j#1  // register copy zp byte:7
 nest2__B2:
  // [19] *((word) 1024) ← (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#2 nest2::i#2 ]  //  _star_cowo1=zpby1
  lda 7
  sta 1024
-  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby=_dec_zpby1
+  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1=_dec_zpby1
+  dec 7
+  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1_gt_0_then_la1
  lda 7
-  sec
-  sbc #1
-  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest2__B2_from_B2
 nest2__B3:
  // [22] (byte) nest2::i#1 ← -- (byte) nest2::i#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::i#1 ]  //  zpby1=_dec_zpby1
@ -2133,6 +2124,7 @@ Removing instruction jmp main__B2
 Removing instruction jmp nest1__B1
 Removing instruction jmp nest1__B2
 Removing instruction jmp nest2__B1
+Removing instruction jmp nest2__B2
 Succesful ASM optimization Pass5NextJumpElimination
 ASSEMBLER
 BBEGIN:
@ -2210,20 +2202,16 @@ nest2__B2_from_B1:
  // (byte) nest2::j#2 = (byte) 100  // zpby1=coby1
  lda #100
  sta 7
-  jmp nest2__B2
 nest2__B2_from_B2:
-  // (byte) nest2::j#2 = (byte) nest2::j#1  // zpby1=aby
-  sta 7
+  // (byte) nest2::j#2 = (byte) nest2::j#1  // register copy zp byte:7
 nest2__B2:
  // [19] *((word) 1024) ← (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#2 nest2::i#2 ]  //  _star_cowo1=zpby1
  lda 7
  sta 1024
-  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby=_dec_zpby1
+  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1=_dec_zpby1
+  dec 7
+  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1_gt_0_then_la1
  lda 7
-  sec
-  sbc #1
-  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest2__B2_from_B2
 nest2__B3:
  // [22] (byte) nest2::i#1 ← -- (byte) nest2::i#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::i#1 ]  //  zpby1=_dec_zpby1
@ -2271,7 +2259,7 @@ FINAL SYMBOL TABLE
 (byte) nest2::i#1 zp byte:6 150001.5
 (byte) nest2::i#2 zp byte:6 40000.4
 (byte) nest2::j
-(byte) nest2::j#1 reg byte a 1500001.5
+(byte) nest2::j#1 zp byte:7 1500001.5
 (byte) nest2::j#2 zp byte:7 1500001.5

 zp byte:2 [ main::i#2 main::i#1 ]
@ -2357,20 +2345,16 @@ nest2__B2_from_B1:
  // (byte) nest2::j#2 = (byte) 100  // zpby1=coby1
  lda #100
  sta 7
-  jmp nest2__B2
 nest2__B2_from_B2:
-  // (byte) nest2::j#2 = (byte) nest2::j#1  // zpby1=aby
-  sta 7
+  // (byte) nest2::j#2 = (byte) nest2::j#1  // register copy zp byte:7
 nest2__B2:
  // [19] *((word) 1024) ← (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#2 nest2::i#2 ]  //  _star_cowo1=zpby1
  lda 7
  sta 1024
-  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby=_dec_zpby1
+  // [20] (byte) nest2::j#1 ← -- (byte) nest2::j#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1=_dec_zpby1
+  dec 7
+  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  zpby1_gt_0_then_la1
  lda 7
-  sec
-  sbc #1
-  // [21] if((byte) nest2::j#1>(byte) 0) goto nest2::@2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::j#1 nest2::i#2 ]  //  aby_gt_0_then_la1
-  cmp #0
  bne nest2__B2_from_B2
 nest2__B3:
  // [22] (byte) nest2::i#1 ← -- (byte) nest2::i#2 [ main::j#2 main::i#2 nest1::j#2 nest1::i#2 nest2::i#1 ]  //  zpby1=_dec_zpby1
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopnest2.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopnest2.sym
@ -34,7 +34,7 @@
 (byte) nest2::i#1 zp byte:6 150001.5
 (byte) nest2::i#2 zp byte:6 40000.4
 (byte) nest2::j
-(byte) nest2::j#1 reg byte a 1500001.5
+(byte) nest2::j#1 zp byte:7 1500001.5
 (byte) nest2::j#2 zp byte:7 1500001.5

 zp byte:2 [ main::i#2 main::i#1 ]
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopsplit.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopsplit.asm
@ -6,8 +6,8 @@ main__B1_from_main:
  lda #0
  sta 3
  lda #100
-main__B1:
  sta 2
+main__B1:
  dec 2
  lda 2
  bne main__B2
@ -22,10 +22,8 @@ main__B2:
 main__B5:
  dec 3
 main__B1_from_B5:
-  lda 2
  jmp main__B1
 main__B4:
  inc 3
 main__B1_from_B4:
-  lda 2
  jmp main__B1
--- a/src/main/java/dk/camelot64/kickc/test/ref/loopsplit.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopsplit.log
@ -538,14 +538,26 @@ VARIABLE REGISTER WEIGHTS
 zp byte:2 [ main::i#2 main::i#1 ]
 zp byte:3 [ main::s#3 main::s#1 main::s#2 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp byte:3 to zp byte:3
-Uplifting of variable (byte) main::i#2 to A
+Uplifting max weight 55.0 live range equivalence class zp byte:3 [ main::s#3 main::s#1 main::s#2 ]
+Error! Alive variable main::s#3 register reg byte a clobbered by the ASM generated by statement [3] if(main::i#1>0) goto main::@2
+  lda 2
+  bne main__B2
+
+Error! Alive variable main::s#3 register reg byte a clobbered by the ASM generated by statement [5] if(main::i#1>50) goto main::@4
+  lda 2
+  cmp #50
+  beq !+
+  bcs main__B4
+!:
+
+Uplift to reg byte a resulted in clobber.
+Uplift to reg byte x succesfull.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
 (void()) main()
 (byte) main::i
 (byte) main::i#1 zp byte:2 11.0
-(byte) main::i#2 reg byte a 33.0
+(byte) main::i#2 zp byte:2 33.0
 (byte) main::s
 (byte) main::s#1 zp byte:3 22.0
 (byte) main::s#2 zp byte:3 22.0
@ -564,12 +576,12 @@ main__B1_from_main:
  // (byte) main::s#3 = (byte) 0  // zpby1=coby1
  lda #0
  sta 3
-  // (byte) main::i#2 = (byte) 100  // aby=coby1
+  // (byte) main::i#2 = (byte) 100  // zpby1=coby1
  lda #100
+  sta 2
  jmp main__B1
 main__B1:
-  // [2] (byte) main::i#1 ← -- (byte) main::i#2 [ main::i#1 main::s#3 ]  //  zpby1=_dec_aby
-  sta 2
+  // [2] (byte) main::i#1 ← -- (byte) main::i#2 [ main::i#1 main::s#3 ]  //  zpby1=_dec_zpby1
  dec 2
  // [3] if((byte) main::i#1>(byte) 0) goto main::@2 [ main::i#1 main::s#3 ]  //  zpby1_gt_0_then_la1
  lda 2
@ -590,16 +602,14 @@ main__B5:
  dec 3
 main__B1_from_B5:
  // (byte) main::s#3 = (byte) main::s#2  // register copy zp byte:3
-  // (byte) main::i#2 = (byte) main::i#1  // aby=zpby1
-  lda 2
+  // (byte) main::i#2 = (byte) main::i#1  // register copy zp byte:2
  jmp main__B1
 main__B4:
  // [7] (byte) main::s#1 ← ++ (byte) main::s#3 [ main::i#1 main::s#1 ]  //  zpby1=_inc_zpby1
  inc 3
 main__B1_from_B4:
  // (byte) main::s#3 = (byte) main::s#1  // register copy zp byte:3
-  // (byte) main::i#2 = (byte) main::i#1  // aby=zpby1
-  lda 2
+  // (byte) main::i#2 = (byte) main::i#1  // register copy zp byte:2
  jmp main__B1

 Removing instruction jmp BEND
@ -616,11 +626,11 @@ main__B1_from_main:
  // (byte) main::s#3 = (byte) 0  // zpby1=coby1
  lda #0
  sta 3
-  // (byte) main::i#2 = (byte) 100  // aby=coby1
+  // (byte) main::i#2 = (byte) 100  // zpby1=coby1
  lda #100
-main__B1:
-  // [2] (byte) main::i#1 ← -- (byte) main::i#2 [ main::i#1 main::s#3 ]  //  zpby1=_dec_aby
  sta 2
+main__B1:
+  // [2] (byte) main::i#1 ← -- (byte) main::i#2 [ main::i#1 main::s#3 ]  //  zpby1=_dec_zpby1
  dec 2
  // [3] if((byte) main::i#1>(byte) 0) goto main::@2 [ main::i#1 main::s#3 ]  //  zpby1_gt_0_then_la1
  lda 2
@ -639,16 +649,14 @@ main__B5:
  dec 3
 main__B1_from_B5:
  // (byte) main::s#3 = (byte) main::s#2  // register copy zp byte:3
-  // (byte) main::i#2 = (byte) main::i#1  // aby=zpby1
-  lda 2
+  // (byte) main::i#2 = (byte) main::i#1  // register copy zp byte:2
  jmp main__B1
 main__B4:
  // [7] (byte) main::s#1 ← ++ (byte) main::s#3 [ main::i#1 main::s#1 ]  //  zpby1=_inc_zpby1
  inc 3
 main__B1_from_B4:
  // (byte) main::s#3 = (byte) main::s#1  // register copy zp byte:3
-  // (byte) main::i#2 = (byte) main::i#1  // aby=zpby1
-  lda 2
+  // (byte) main::i#2 = (byte) main::i#1  // register copy zp byte:2
  jmp main__B1

 FINAL SYMBOL TABLE
@ -662,7 +670,7 @@ FINAL SYMBOL TABLE
 (label) main::@return
 (byte) main::i
 (byte) main::i#1 zp byte:2 11.0
-(byte) main::i#2 reg byte a 33.0
+(byte) main::i#2 zp byte:2 33.0
 (byte) main::s
 (byte) main::s#1 zp byte:3 22.0
 (byte) main::s#2 zp byte:3 22.0
@ -680,11 +688,11 @@ main__B1_from_main:
  // (byte) main::s#3 = (byte) 0  // zpby1=coby1
  lda #0
  sta 3
-  // (byte) main::i#2 = (byte) 100  // aby=coby1
+  // (byte) main::i#2 = (byte) 100  // zpby1=coby1
  lda #100
-main__B1:
-  // [2] (byte) main::i#1 ← -- (byte) main::i#2 [ main::i#1 main::s#3 ]  //  zpby1=_dec_aby
  sta 2
+main__B1:
+  // [2] (byte) main::i#1 ← -- (byte) main::i#2 [ main::i#1 main::s#3 ]  //  zpby1=_dec_zpby1
  dec 2
  // [3] if((byte) main::i#1>(byte) 0) goto main::@2 [ main::i#1 main::s#3 ]  //  zpby1_gt_0_then_la1
  lda 2
@ -703,15 +711,13 @@ main__B5:
  dec 3
 main__B1_from_B5:
  // (byte) main::s#3 = (byte) main::s#2  // register copy zp byte:3
-  // (byte) main::i#2 = (byte) main::i#1  // aby=zpby1
-  lda 2
+  // (byte) main::i#2 = (byte) main::i#1  // register copy zp byte:2
  jmp main__B1
 main__B4:
  // [7] (byte) main::s#1 ← ++ (byte) main::s#3 [ main::i#1 main::s#1 ]  //  zpby1=_inc_zpby1
  inc 3
 main__B1_from_B4:
  // (byte) main::s#3 = (byte) main::s#1  // register copy zp byte:3
-  // (byte) main::i#2 = (byte) main::i#1  // aby=zpby1
-  lda 2
+  // (byte) main::i#2 = (byte) main::i#1  // register copy zp byte:2
  jmp main__B1

--- a/src/main/java/dk/camelot64/kickc/test/ref/loopsplit.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/loopsplit.sym
@ -8,7 +8,7 @@
 (label) main::@return
 (byte) main::i
 (byte) main::i#1 zp byte:2 11.0
-(byte) main::i#2 reg byte a 33.0
+(byte) main::i#2 zp byte:2 33.0
 (byte) main::s
 (byte) main::s#1 zp byte:3 22.0
 (byte) main::s#2 zp byte:3 22.0
--- a/src/main/java/dk/camelot64/kickc/test/ref/minus.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/minus.asm
@ -7,6 +7,8 @@ B1:
  lda 2
  clc
  adc #4
+  sta 3
+  lda 3
  ldx 2
  sta 4352,x
  inc 2
--- a/src/main/java/dk/camelot64/kickc/test/ref/minus.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/minus.log
@ -311,11 +311,22 @@ VARIABLE REGISTER WEIGHTS
 zp byte:2 [ i#2 i#1 ]
 zp byte:3 [ $1 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp byte:3 to zp byte:3
-Uplifting of variable (byte~) $1 to A
+Uplifting max weight 31.166666666666664 live range equivalence class zp byte:2 [ i#2 i#1 ]
+Error! Alive variable i#2 register reg byte a clobbered by the ASM generated by statement [1] $1 ← i#2 + 4
+  clc
+  adc #4
+  sta 3
+
+Error! Alive variable i#2 register reg byte a clobbered by the ASM generated by statement [2] *(4352 + i#2) ← $1
+  tax
+  lda 3
+  sta 4352,x
+
+Uplift to reg byte a resulted in clobber.
+Uplift to reg byte x succesfull.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
-(byte~) $1 reg byte a 22.0
+(byte~) $1 zp byte:3 22.0
 (byte) i
 (byte) i#1 zp byte:2 16.5
 (byte) i#2 zp byte:2 14.666666666666666
@ -335,11 +346,13 @@ B1_from_B1:
  // (byte) i#2 = (byte) i#1  // register copy zp byte:2
  jmp B1
 B1:
-  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  aby=zpby1_plus_coby1
+  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  zpby1=zpby2_plus_coby1
  lda 2
  clc
  adc #4
-  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=aby
+  sta 3
+  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
+  lda 3
  ldx 2
  sta 4352,x
  // [3] (byte) i#1 ← (byte) i#2 + (byte) 1 [ i#1 ]  //  zpby1=zpby1_plus_1
@ -364,11 +377,13 @@ B1_from_BBEGIN:
 B1_from_B1:
  // (byte) i#2 = (byte) i#1  // register copy zp byte:2
 B1:
-  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  aby=zpby1_plus_coby1
+  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  zpby1=zpby2_plus_coby1
  lda 2
  clc
  adc #4
-  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=aby
+  sta 3
+  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
+  lda 3
  ldx 2
  sta 4352,x
  // [3] (byte) i#1 ← (byte) i#2 + (byte) 1 [ i#1 ]  //  zpby1=zpby1_plus_1
@ -390,11 +405,13 @@ B1_from_BBEGIN:
 B1_from_B1:
  // (byte) i#2 = (byte) i#1  // register copy zp byte:2
 B1:
-  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  aby=zpby1_plus_coby1
+  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  zpby1=zpby2_plus_coby1
  lda 2
  clc
  adc #4
-  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=aby
+  sta 3
+  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
+  lda 3
  ldx 2
  sta 4352,x
  // [3] (byte) i#1 ← (byte) i#2 + (byte) 1 [ i#1 ]  //  zpby1=zpby1_plus_1
@ -406,7 +423,7 @@ B1:
 BEND:

 FINAL SYMBOL TABLE
-(byte~) $1 reg byte a 22.0
+(byte~) $1 zp byte:3 22.0
 (label) @1
 (label) @BEGIN
 (label) @END
@ -427,11 +444,13 @@ B1_from_BBEGIN:
 B1_from_B1:
  // (byte) i#2 = (byte) i#1  // register copy zp byte:2
 B1:
-  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  aby=zpby1_plus_coby1
+  // [1] (byte~) $1 ← (byte) i#2 + (byte) 4 [ i#2 $1 ]  //  zpby1=zpby2_plus_coby1
  lda 2
  clc
  adc #4
-  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=aby
+  sta 3
+  // [2] *((word) 4352 + (byte) i#2) ← (byte~) $1 [ i#2 ]  //  cowo1_staridx_zpby1=zpby2
+  lda 3
  ldx 2
  sta 4352,x
  // [3] (byte) i#1 ← (byte) i#2 + (byte) 1 [ i#1 ]  //  zpby1=zpby1_plus_1
--- a/src/main/java/dk/camelot64/kickc/test/ref/minus.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/minus.sym
@ -1,4 +1,4 @@
-(byte~) $1 reg byte a 22.0
+(byte~) $1 zp byte:3 22.0
 (label) @1
 (label) @BEGIN
 (label) @END
--- a/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.asm
@ -63,6 +63,7 @@ rvaluevar__B1_from_B2:
  jmp rvaluevar__B1
 rvalue:
  lda 1024
+  sta 11
  lda 1025
  sta 12
 rvalue__B1_from_rvalue:
--- a/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.log
@ -1890,16 +1890,22 @@ zp byte:10 [ rvaluevar::b#0 ]
 zp byte:11 [ rvalue::b#0 ]
 zp byte:12 [ rvalue::b#1 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp ptr byte:3 to zp ptr byte:3
-Re-allocated ZP register from zp byte:5 to zp byte:5
-Re-allocated ZP register from zp ptr byte:6 to zp ptr byte:6
-Re-allocated ZP register from zp byte:8 to zp byte:8
-Re-allocated ZP register from zp byte:9 to zp byte:9
-Re-allocated ZP register from zp byte:10 to zp byte:10
-Re-allocated ZP register from zp byte:11 to zp byte:11
-Re-allocated ZP register from zp byte:12 to zp byte:12
-Uplifting of variable (byte) rvalue::b#0 to A
+Uplifting max weight Infinity live range equivalence class zp byte:8 [ rvalue::i#2 rvalue::i#1 rvalue::b#2 ]
+Error! Alive variable rvalue::i#2 register reg byte a clobbered by the ASM generated by statement [23] rvalue::b#2 ← 1024 *idx rvalue::i#2
+  tax
+  lda 1024,x
+
+Uplift to reg byte a resulted in clobber.
+Error! Alive variable rvalue::i#2 register reg byte x clobbered by the ASM generated by statement [23] rvalue::b#2 ← 1024 *idx rvalue::i#2
+  lda 1024,x
+  tax
+
+Uplift to reg byte x resulted in clobber.
+Error! Alive variable rvalue::i#2 register reg byte y clobbered by the ASM generated by statement [23] rvalue::b#2 ← 1024 *idx rvalue::i#2
+  lda 1024,y
+  tay
+
+Uplift to reg byte y resulted in clobber.
 REGISTER UPLIFTING
 (void()) lvalue()
 (byte[1024]) lvalue::SCREEN
@ -1918,7 +1924,7 @@ REGISTER UPLIFTING
 (void()) rvalue()
 (byte[1024]) rvalue::SCREEN
 (byte) rvalue::b
-(byte) rvalue::b#0 reg byte a Infinity
+(byte) rvalue::b#0 zp byte:11 Infinity
 (byte) rvalue::b#1 zp byte:12 Infinity
 (byte) rvalue::b#2 zp byte:8 Infinity
 (byte) rvalue::i
@ -2041,8 +2047,9 @@ rvaluevar__B1_from_B2:
  // (byte) rvaluevar::i#2 = (byte) rvaluevar::i#1  // register copy zp byte:5
  jmp rvaluevar__B1
 rvalue:
-  // [18] (byte) rvalue::b#0 ← * (word) 1024 [ ]  //  aby=_star_cowo1
+  // [18] (byte) rvalue::b#0 ← * (word) 1024 [ ]  //  zpby1=_star_cowo1
  lda 1024
+  sta 11
  // [19] (byte) rvalue::b#1 ← * (word) 1025 [ ]  //  zpby1=_star_cowo1
  lda 1025
  sta 12
@ -2195,8 +2202,9 @@ rvaluevar__B1_from_B2:
  // (byte) rvaluevar::i#2 = (byte) rvaluevar::i#1  // register copy zp byte:5
  jmp rvaluevar__B1
 rvalue:
-  // [18] (byte) rvalue::b#0 ← * (word) 1024 [ ]  //  aby=_star_cowo1
+  // [18] (byte) rvalue::b#0 ← * (word) 1024 [ ]  //  zpby1=_star_cowo1
  lda 1024
+  sta 11
  // [19] (byte) rvalue::b#1 ← * (word) 1025 [ ]  //  zpby1=_star_cowo1
  lda 1025
  sta 12
@ -2283,7 +2291,7 @@ FINAL SYMBOL TABLE
 (label) rvalue::@return
 (byte[1024]) rvalue::SCREEN
 (byte) rvalue::b
-(byte) rvalue::b#0 reg byte a Infinity
+(byte) rvalue::b#0 zp byte:11 Infinity
 (byte) rvalue::b#1 zp byte:12 Infinity
 (byte) rvalue::b#2 zp byte:8 Infinity
 (byte) rvalue::i
@ -2386,8 +2394,9 @@ rvaluevar__B1_from_B2:
  // (byte) rvaluevar::i#2 = (byte) rvaluevar::i#1  // register copy zp byte:5
  jmp rvaluevar__B1
 rvalue:
-  // [18] (byte) rvalue::b#0 ← * (word) 1024 [ ]  //  aby=_star_cowo1
+  // [18] (byte) rvalue::b#0 ← * (word) 1024 [ ]  //  zpby1=_star_cowo1
  lda 1024
+  sta 11
  // [19] (byte) rvalue::b#1 ← * (word) 1025 [ ]  //  zpby1=_star_cowo1
  lda 1025
  sta 12
--- a/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.sym
@ -30,7 +30,7 @@
 (label) rvalue::@return
 (byte[1024]) rvalue::SCREEN
 (byte) rvalue::b
-(byte) rvalue::b#0 reg byte a Infinity
+(byte) rvalue::b#0 zp byte:11 Infinity
 (byte) rvalue::b#1 zp byte:12 Infinity
 (byte) rvalue::b#2 zp byte:8 Infinity
 (byte) rvalue::i
--- a/src/main/java/dk/camelot64/kickc/test/ref/summin.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/summin.asm
@ -20,6 +20,7 @@ B3:
  lda 4
  clc
  adc 5
+  sta 4
 BEND:
 sum:
  lda 2
--- a/src/main/java/dk/camelot64/kickc/test/ref/summin.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/summin.log
@ -390,18 +390,43 @@ zp byte:3 [ sum::b#2 ]
 zp byte:4 [ s1#0 s3#0 ]
 zp byte:5 [ s2#0 ]

-Re-allocated ZP register from zp byte:2 to zp byte:2
-Re-allocated ZP register from zp byte:3 to zp byte:3
-Re-allocated ZP register from zp byte:4 to zp byte:4
-Re-allocated ZP register from zp byte:5 to zp byte:5
-Uplifting of variable (byte) s3#0 to A
+Uplifting max weight Infinity live range equivalence class zp byte:4 [ s1#0 s3#0 ]
+Error! Alive variable s1#0 register reg byte a clobbered by the ASM generated by statement [0] call sum param-assignment
+sum_from_BBEGIN:
+  lda #2
+  sta 3
+  lda #1
+  sta 2
+  jsr sum
+
+Error! Alive variable s1#0 register reg byte a clobbered by the ASM generated by statement [2] call sum param-assignment
+sum_from_B2:
+  lda #13
+  sta 3
+  lda #9
+  sta 2
+  jsr sum
+
+Error! Alive variable s1#0 register reg byte a clobbered by the ASM generated by statement [3] s2#0 ← sum::return#0
+  lda 2
+  sta 5
+
+Error! Alive variable s1#0 register reg byte a clobbered by the ASM generated by statement [6] sum::return#0 ← sum::a#2 + sum::b#2
+  lda 2
+  clc
+  adc 3
+  sta 2
+
+Uplift to reg byte a resulted in clobber.
+Uplift to reg byte x succesfull.
+Uplift to reg byte y succesfull.
 REGISTER UPLIFTING
 (byte) s1
 (byte) s1#0 zp byte:4 0.5714285714285714
 (byte) s2
 (byte) s2#0 zp byte:5 4.0
 (byte) s3
-(byte) s3#0 reg byte a Infinity
+(byte) s3#0 zp byte:4 Infinity
 (byte()) sum((byte) sum::a , (byte) sum::b)
 (byte) sum::a
 (byte) sum::a#2 zp byte:2 2.0
@ -444,10 +469,11 @@ B3:
  // [3] (byte) s2#0 ← (byte) sum::return#0 [ s1#0 s2#0 ]  //  zpby1=zpby2
  lda 2
  sta 5
-  // [4] (byte) s3#0 ← (byte) s1#0 + (byte) s2#0 [ ]  //  aby=zpby1_plus_zpby2
+  // [4] (byte) s3#0 ← (byte) s1#0 + (byte) s2#0 [ ]  //  zpby1=zpby1_plus_zpby2
  lda 4
  clc
  adc 5
+  sta 4
  jmp BEND
 BEND:
 sum:
@ -491,10 +517,11 @@ B3:
  // [3] (byte) s2#0 ← (byte) sum::return#0 [ s1#0 s2#0 ]  //  zpby1=zpby2
  lda 2
  sta 5
-  // [4] (byte) s3#0 ← (byte) s1#0 + (byte) s2#0 [ ]  //  aby=zpby1_plus_zpby2
+  // [4] (byte) s3#0 ← (byte) s1#0 + (byte) s2#0 [ ]  //  zpby1=zpby1_plus_zpby2
  lda 4
  clc
  adc 5
+  sta 4
 BEND:
 sum:
  // [6] (byte) sum::return#0 ← (byte) sum::a#2 + (byte) sum::b#2 [ sum::return#0 s1#0 ]  //  zpby1=zpby1_plus_zpby2
@ -515,7 +542,7 @@ FINAL SYMBOL TABLE
 (byte) s2
 (byte) s2#0 zp byte:5 4.0
 (byte) s3
-(byte) s3#0 reg byte a Infinity
+(byte) s3#0 zp byte:4 Infinity
 (byte()) sum((byte) sum::a , (byte) sum::b)
 (label) sum::@return
 (byte) sum::a
@ -555,10 +582,11 @@ B3:
  // [3] (byte) s2#0 ← (byte) sum::return#0 [ s1#0 s2#0 ]  //  zpby1=zpby2
  lda 2
  sta 5
-  // [4] (byte) s3#0 ← (byte) s1#0 + (byte) s2#0 [ ]  //  aby=zpby1_plus_zpby2
+  // [4] (byte) s3#0 ← (byte) s1#0 + (byte) s2#0 [ ]  //  zpby1=zpby1_plus_zpby2
  lda 4
  clc
  adc 5
+  sta 4
 BEND:
 sum:
  // [6] (byte) sum::return#0 ← (byte) sum::a#2 + (byte) sum::b#2 [ sum::return#0 s1#0 ]  //  zpby1=zpby1_plus_zpby2
--- a/src/main/java/dk/camelot64/kickc/test/ref/summin.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/summin.sym
@ -7,7 +7,7 @@
 (byte) s2
 (byte) s2#0 zp byte:5 4.0
 (byte) s3
-(byte) s3#0 reg byte a Infinity
+(byte) s3#0 zp byte:4 Infinity
 (byte()) sum((byte) sum::a , (byte) sum::b)
 (label) sum::@return
 (byte) sum::a
--- a/src/main/java/dk/camelot64/kickc/test/ref/useglobal.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/useglobal.asm
@ -0,0 +1,8 @@
+BBEGIN:
+  jsr main
+BEND:
+main:
+  lda #1
+  sta 1024
+main__Breturn:
+  rts
--- a/src/main/java/dk/camelot64/kickc/test/ref/useglobal.cfg
+++ b/src/main/java/dk/camelot64/kickc/test/ref/useglobal.cfg
@ -0,0 +1,10 @@
+@BEGIN: from
+  [0] call main param-assignment [ ]
+  to:@END
+@END: from @BEGIN
+main: from @BEGIN
+  [1] *((word) 1024) ← (byte) 1 [ ]
+  to:main::@return
+main::@return: from main
+  [2] return  [ ]
+  to:@RETURN
--- a/src/main/java/dk/camelot64/kickc/test/ref/useglobal.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/useglobal.log
@ -0,0 +1,261 @@
+// Tests procedures using global variables (should not fail)
+byte* SCREEN = $0400;
+main();
+void main() {
+   *SCREEN = 1;
+}
+PROGRAM
+  (byte*) SCREEN ← (word) 1024
+  (void~) $0 ← call main 
+  proc (void()) main()
+  *((byte*) SCREEN) ← (byte) 1
+main::@return:
+  return 
+  endproc // main()
+
+SYMBOLS
+(void~) $0
+(byte*) SCREEN
+(void()) main()
+(label) main::@return
+
+INITIAL CONTROL FLOW GRAPH
+@BEGIN: from
+  (byte*) SCREEN ← (word) 1024
+  (void~) $0 ← call main 
+  to:@1
+main: from
+  *((byte*) SCREEN) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@1: from @BEGIN
+  to:@END
+@END: from @1
+
+Removing empty block @1
+CONTROL FLOW GRAPH
+@BEGIN: from
+  (byte*) SCREEN ← (word) 1024
+  (void~) $0 ← call main 
+  to:@END
+main: from
+  *((byte*) SCREEN) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@END: from @BEGIN
+
+CONTROL FLOW GRAPH WITH ASSIGNMENT CALL
+@BEGIN: from
+  (byte*) SCREEN ← (word) 1024
+  call main param-assignment
+  to:@2
+@2: from @BEGIN
+  to:@END
+main: from @BEGIN
+  *((byte*) SCREEN) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@END: from @2
+
+Completing Phi functions...
+CONTROL FLOW GRAPH SSA
+@BEGIN: from
+  (byte*) SCREEN#0 ← (word) 1024
+  call main param-assignment
+  to:@2
+@2: from @BEGIN
+  to:@END
+main: from @BEGIN
+  (byte*) SCREEN#1 ← phi( @BEGIN/(byte*) SCREEN#0 )
+  *((byte*) SCREEN#1) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@END: from @2
+
+CONTROL FLOW GRAPH WITH ASSIGNMENT CALL & RETURN
+@BEGIN: from
+  (byte*) SCREEN#0 ← (word) 1024
+  call main param-assignment
+  to:@2
+@2: from @BEGIN
+  to:@END
+main: from @BEGIN
+  (byte*) SCREEN#1 ← phi( @BEGIN/(byte*) SCREEN#0 )
+  *((byte*) SCREEN#1) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@END: from @2
+
+Culled Empty Block (label) @2
+Succesful SSA optimization Pass2CullEmptyBlocks
+CONTROL FLOW GRAPH
+@BEGIN: from
+  (byte*) SCREEN#0 ← (word) 1024
+  call main param-assignment
+  to:@END
+main: from @BEGIN
+  (byte*) SCREEN#1 ← phi( @BEGIN/(byte*) SCREEN#0 )
+  *((byte*) SCREEN#1) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@END: from @BEGIN
+
+Constant (byte*) SCREEN#0 (word) 1024
+Succesful SSA optimization Pass2ConstantPropagation
+CONTROL FLOW GRAPH
+@BEGIN: from
+  call main param-assignment
+  to:@END
+main: from @BEGIN
+  (byte*) SCREEN#1 ← phi( @BEGIN/(word) 1024 )
+  *((byte*) SCREEN#1) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@END: from @BEGIN
+
+Redundant Phi (byte*) SCREEN#1 (word) 1024
+Succesful SSA optimization Pass2RedundantPhiElimination
+CONTROL FLOW GRAPH
+@BEGIN: from
+  call main param-assignment
+  to:@END
+main: from @BEGIN
+  *((word) 1024) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+@END: from @BEGIN
+
+Block Sequence Planned @BEGIN @END main main::@return 
+Block Sequence Planned @BEGIN @END main main::@return 
+CONTROL FLOW GRAPH - PHI LIFTED
+@BEGIN: from
+  call main param-assignment
+  to:@END
+@END: from @BEGIN
+main: from @BEGIN
+  *((word) 1024) ← (byte) 1
+  to:main::@return
+main::@return: from main
+  return 
+  to:@RETURN
+
+Propagating live ranges...
+CONTROL FLOW GRAPH - LIVE RANGES
+@BEGIN: from
+  [0] call main param-assignment [ ]
+  to:@END
+@END: from @BEGIN
+main: from @BEGIN
+  [1] *((word) 1024) ← (byte) 1 [ ]
+  to:main::@return
+main::@return: from main
+  [2] return  [ ]
+  to:@RETURN
+
+Created 0 initial phi equivalence classes
+Coalesced down to 0 phi equivalence classes
+Block Sequence Planned @BEGIN @END main main::@return 
+Propagating live ranges...
+CONTROL FLOW GRAPH - PHI MEM COALESCED
+@BEGIN: from
+  [0] call main param-assignment [ ]
+  to:@END
+@END: from @BEGIN
+main: from @BEGIN
+  [1] *((word) 1024) ← (byte) 1 [ ]
+  to:main::@return
+main::@return: from main
+  [2] return  [ ]
+  to:@RETURN
+
+CALL GRAPH
+Calls in [] to 0:main 
+
+DOMINATORS
+@BEGIN dominated by  @BEGIN 
+@END dominated by  @BEGIN @END 
+main dominated by  @BEGIN main 
+main::@return dominated by  @BEGIN main::@return main 
+
+NATURAL LOOPS
+
+Found 0 loops in scope []
+Found 0 loops in scope [main]
+NATURAL LOOPS WITH DEPTH
+
+Initial phi equivalence classes
+Copy Coalesced equivalence classes
+Complete equivalence classes
+
+VARIABLE REGISTER WEIGHTS
+(byte*) SCREEN
+(void()) main()
+
+
+REGISTER UPLIFTING
+(byte*) SCREEN
+(void()) main()
+
+
+INITIAL ASM
+BBEGIN:
+  jsr main
+  jmp BEND
+BEND:
+main:
+  // [1] *((word) 1024) ← (byte) 1 [ ]  //  _star_cowo1=coby2
+  lda #1
+  sta 1024
+  jmp main__Breturn
+main__Breturn:
+  rts
+
+Removing instruction jmp BEND
+Removing instruction jmp main__Breturn
+Succesful ASM optimization Pass5NextJumpElimination
+ASSEMBLER
+BBEGIN:
+  jsr main
+BEND:
+main:
+  // [1] *((word) 1024) ← (byte) 1 [ ]  //  _star_cowo1=coby2
+  lda #1
+  sta 1024
+main__Breturn:
+  rts
+
+FINAL SYMBOL TABLE
+(label) @BEGIN
+(label) @END
+(byte*) SCREEN
+(void()) main()
+(label) main::@return
+
+
+FINAL CODE
+BBEGIN:
+  jsr main
+BEND:
+main:
+  // [1] *((word) 1024) ← (byte) 1 [ ]  //  _star_cowo1=coby2
+  lda #1
+  sta 1024
+main__Breturn:
+  rts
+
--- a/src/main/java/dk/camelot64/kickc/test/ref/useglobal.sym
+++ b/src/main/java/dk/camelot64/kickc/test/ref/useglobal.sym
@ -0,0 +1,6 @@
+(label) @BEGIN
+(label) @END
+(byte*) SCREEN
+(void()) main()
+(label) main::@return
+