Fixing pointer array-indexing *((word*) screen + (byte) main::i)
Warning! Adding boolean cast to non-boolean sub-expression (number~) main::$0
Identified constant variable (word*) screen
Culled Empty Block (label) main::@4

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  to:@1

(void()) main()
main: scope:[main]  from @1
  (byte) main::i#0 ← (byte) 0
  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 )
  (word) main::w#0 ← (word)(byte) main::i#2
  (number~) main::$0 ← (byte) main::i#2 & (number) 1
  (bool~) main::$4 ← (number) 0 != (number~) main::$0
  (bool~) main::$1 ← ! (bool~) main::$4
  if((bool~) main::$1) goto main::@2
  to:main::@3
main::@2: scope:[main]  from main::@1 main::@3
  (word) main::w#2 ← phi( main::@1/(word) main::w#0 main::@3/(word) main::w#1 )
  (byte) main::i#3 ← phi( main::@1/(byte) main::i#2 main::@3/(byte) main::i#4 )
  (byte~) main::$3 ← (byte) main::i#3 * (const byte) SIZEOF_WORD
  *((const word*) screen + (byte~) main::$3) ← (word) main::w#2
  (byte) main::i#1 ← (byte) main::i#3 + rangenext(0,7)
  (bool~) main::$2 ← (byte) main::i#1 != rangelast(0,7)
  if((bool~) main::$2) goto main::@1
  to:main::@return
main::@3: scope:[main]  from main::@1
  (byte) main::i#4 ← phi( main::@1/(byte) main::i#2 )
  (word) main::w#1 ← (number) -1
  to:main::@2
main::@return: scope:[main]  from main::@2
  return 
  to:@return
@1: scope:[]  from @begin
  call main 
  to:@2
@2: scope:[]  from @1
  to:@end
@end: scope:[]  from @2

SYMBOL TABLE SSA
(label) @1
(label) @2
(label) @begin
(label) @end
(const byte) SIZEOF_WORD = (byte) 2
(void()) main()
(number~) main::$0
(bool~) main::$1
(bool~) main::$2
(byte~) main::$3
(bool~) main::$4
(label) main::@1
(label) main::@2
(label) main::@3
(label) main::@return
(byte) main::i
(byte) main::i#0
(byte) main::i#1
(byte) main::i#2
(byte) main::i#3
(byte) main::i#4
(word) main::w
(word) main::w#0
(word) main::w#1
(word) main::w#2
(const word*) screen = (word*)(number) $400

Adding number conversion cast (unumber) 1 in (number~) main::$0 ← (byte) main::i#2 & (number) 1
Adding number conversion cast (unumber) main::$0 in (number~) main::$0 ← (byte) main::i#2 & (unumber)(number) 1
Adding number conversion cast (unumber) 0 in (bool~) main::$4 ← (number) 0 != (unumber~) main::$0
Adding number conversion cast (unumber) -1 in (word) main::w#1 ← (number) -1
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast (word) main::w#1 ← (unumber)(number) -1
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (word*) 1024
Simplifying constant integer cast 1
Simplifying constant integer cast 0
Simplifying constant integer cast -1
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 1
Finalized unsigned number type (byte) 0
Finalized unsigned number type (byte) -1
Successful SSA optimization PassNFinalizeNumberTypeConversions
Inferred type updated to byte in (unumber~) main::$0 ← (byte) main::i#2 & (byte) 1
Inversing boolean not [5] (bool~) main::$1 ← (byte) 0 == (byte~) main::$0 from [4] (bool~) main::$4 ← (byte) 0 != (byte~) main::$0
Successful SSA optimization Pass2UnaryNotSimplification
Alias (byte) main::i#2 = (byte) main::i#4 
Successful SSA optimization Pass2AliasElimination
Alias (byte) main::i#2 = (byte) main::i#3 
Successful SSA optimization Pass2AliasElimination
Simple Condition (bool~) main::$1 [5] if((byte) 0==(byte~) main::$0) goto main::@2
Simple Condition (bool~) main::$2 [11] if((byte) main::i#1!=rangelast(0,7)) goto main::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const byte) main::i#0 = 0
Constant (const word) main::w#1 = -1
Successful SSA optimization Pass2ConstantIdentification
Resolved ranged next value [9] main::i#1 ← ++ main::i#2 to ++
Resolved ranged comparison value [11] if(main::i#1!=rangelast(0,7)) goto main::@1 to (number) 8
Adding number conversion cast (unumber) 8 in if((byte) main::i#1!=(number) 8) goto main::@1
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast 8
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 8
Successful SSA optimization PassNFinalizeNumberTypeConversions
Rewriting multiplication to use shift [5] (byte~) main::$3 ← (byte) main::i#2 * (const byte) SIZEOF_WORD
Successful SSA optimization Pass2MultiplyToShiftRewriting
Inlining constant with var siblings (const byte) main::i#0
Inlining constant with var siblings (const word) main::w#1
Constant inlined main::i#0 = (byte) 0
Constant inlined main::w#1 = (byte) -1
Successful SSA optimization Pass2ConstantInlining
Eliminating unused constant (const byte) SIZEOF_WORD
Successful SSA optimization PassNEliminateUnusedVars
Added new block during phi lifting main::@5(between main::@2 and main::@1)
Added new block during phi lifting main::@6(between main::@1 and main::@2)
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @2
Adding NOP phi() at start of @end
Adding NOP phi() at start of main
Adding NOP phi() at start of main::@3
CALL GRAPH
Calls in [] to main:2 

Created 2 initial phi equivalence classes
Coalesced [17] main::i#5 ← main::i#1
Coalesced [18] main::w#3 ← main::w#0
Coalesced down to 2 phi equivalence classes
Culled Empty Block (label) @2
Culled Empty Block (label) main::@3
Culled Empty Block (label) main::@5
Renumbering block main::@6 to main::@3
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @end
Adding NOP phi() at start of main
Adding NOP phi() at start of main::@3

FINAL CONTROL FLOW GRAPH
@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()

(void()) main()
main: scope:[main]  from @1
  [4] phi()
  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] (word) main::w#0 ← (word)(byte) main::i#2
  [7] (byte~) main::$0 ← (byte) main::i#2 & (byte) 1
  [8] if((byte) 0==(byte~) main::$0) goto main::@3
  to:main::@2
main::@3: scope:[main]  from main::@1
  [9] phi()
  to:main::@2
main::@2: scope:[main]  from main::@1 main::@3
  [10] (word) main::w#2 ← phi( main::@3/(word) main::w#0 main::@1/(byte) -1 )
  [11] (byte~) main::$3 ← (byte) main::i#2 << (byte) 1
  [12] *((const word*) screen + (byte~) main::$3) ← (word) main::w#2
  [13] (byte) main::i#1 ← ++ (byte) main::i#2
  [14] if((byte) main::i#1!=(byte) 8) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@2
  [15] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(void()) main()
(byte~) main::$0 22.0
(byte~) main::$3 22.0
(byte) main::i
(byte) main::i#1 16.5
(byte) main::i#2 5.5
(word) main::w
(word) main::w#0 5.5
(word) main::w#2 11.0

Initial phi equivalence classes
[ main::i#2 main::i#1 ]
[ main::w#2 main::w#0 ]
Added variable main::$0 to live range equivalence class [ main::$0 ]
Added variable main::$3 to live range equivalence class [ main::$3 ]
Complete equivalence classes
[ main::i#2 main::i#1 ]
[ main::w#2 main::w#0 ]
[ main::$0 ]
[ main::$3 ]
Allocated zp[1]:2 [ main::i#2 main::i#1 ]
Allocated zp[2]:3 [ main::w#2 main::w#0 ]
Allocated zp[1]:5 [ main::$0 ]
Allocated zp[1]:6 [ main::$3 ]

INITIAL ASM
Target platform is c64basic / MOS6502X
  // File Comments
// Problem with assigning negative word constant (vwuz1=vbuc1)
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(__bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  .label screen = $400
  // @begin
__bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
__b1_from___bbegin:
  jmp __b1
  // @1
__b1:
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
main_from___b1:
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
__bend_from___b1:
  jmp __bend
  // @end
__bend:
  // main
main: {
    .label __0 = 5
    .label __3 = 6
    .label w = 3
    .label i = 2
    // [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] -- vbuz1=vbuc1 
    lda #0
    sta.z i
    jmp __b1
    // [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 
    jmp __b1
    // main::@1
  __b1:
    // [6] (word) main::w#0 ← (word)(byte) main::i#2 -- vwuz1=_word_vbuz2 
    lda.z i
    sta.z w
    lda #0
    sta.z w+1
    // [7] (byte~) main::$0 ← (byte) main::i#2 & (byte) 1 -- vbuz1=vbuz2_band_vbuc1 
    lda #1
    and.z i
    sta.z __0
    // [8] if((byte) 0==(byte~) main::$0) goto main::@3 -- vbuc1_eq_vbuz1_then_la1 
    lda #0
    cmp.z __0
    beq __b3_from___b1
    // [10] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
  __b2_from___b1:
    // [10] phi (word) main::w#2 = (byte) -1 [phi:main::@1->main::@2#0] -- vwuz1=vbuc1 
    lda #<-1
    sta.z w
    lda #>-1
    sta.z w+1
    jmp __b2
    // [9] phi from main::@1 to main::@3 [phi:main::@1->main::@3]
  __b3_from___b1:
    jmp __b3
    // main::@3
  __b3:
    // [10] phi from main::@3 to main::@2 [phi:main::@3->main::@2]
  __b2_from___b3:
    // [10] phi (word) main::w#2 = (word) main::w#0 [phi:main::@3->main::@2#0] -- register_copy 
    jmp __b2
    // main::@2
  __b2:
    // [11] (byte~) main::$3 ← (byte) main::i#2 << (byte) 1 -- vbuz1=vbuz2_rol_1 
    lda.z i
    asl
    sta.z __3
    // [12] *((const word*) screen + (byte~) main::$3) ← (word) main::w#2 -- pwuc1_derefidx_vbuz1=vwuz2 
    ldy.z __3
    lda.z w
    sta screen,y
    lda.z w+1
    sta screen+1,y
    // [13] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuz1=_inc_vbuz1 
    inc.z i
    // [14] if((byte) main::i#1!=(byte) 8) goto main::@1 -- vbuz1_neq_vbuc1_then_la1 
    lda #8
    cmp.z i
    bne __b1_from___b2
    jmp __breturn
    // main::@return
  __breturn:
    // [15] return 
    rts
}
  // File Data

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [6] (word) main::w#0 ← (word)(byte) main::i#2 [ main::i#2 main::w#0 ] ( main:2 [ main::i#2 main::w#0 ] ) always clobbers reg byte a 
Removing always clobbered register reg byte a as potential for zp[1]:2 [ main::i#2 main::i#1 ]
Statement [7] (byte~) main::$0 ← (byte) main::i#2 & (byte) 1 [ main::i#2 main::w#0 main::$0 ] ( main:2 [ main::i#2 main::w#0 main::$0 ] ) always clobbers reg byte a 
Statement [11] (byte~) main::$3 ← (byte) main::i#2 << (byte) 1 [ main::i#2 main::w#2 main::$3 ] ( main:2 [ main::i#2 main::w#2 main::$3 ] ) always clobbers reg byte a 
Statement [12] *((const word*) screen + (byte~) main::$3) ← (word) main::w#2 [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
Statement [6] (word) main::w#0 ← (word)(byte) main::i#2 [ main::i#2 main::w#0 ] ( main:2 [ main::i#2 main::w#0 ] ) always clobbers reg byte a 
Statement [7] (byte~) main::$0 ← (byte) main::i#2 & (byte) 1 [ main::i#2 main::w#0 main::$0 ] ( main:2 [ main::i#2 main::w#0 main::$0 ] ) always clobbers reg byte a 
Statement [11] (byte~) main::$3 ← (byte) main::i#2 << (byte) 1 [ main::i#2 main::w#2 main::$3 ] ( main:2 [ main::i#2 main::w#2 main::$3 ] ) always clobbers reg byte a 
Statement [12] *((const word*) screen + (byte~) main::$3) ← (word) main::w#2 [ main::i#2 ] ( main:2 [ main::i#2 ] ) always clobbers reg byte a 
Potential registers zp[1]:2 [ main::i#2 main::i#1 ] : zp[1]:2 , reg byte x , reg byte y , 
Potential registers zp[2]:3 [ main::w#2 main::w#0 ] : zp[2]:3 , 
Potential registers zp[1]:5 [ main::$0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:6 [ main::$3 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 22: zp[1]:2 [ main::i#2 main::i#1 ] 22: zp[1]:5 [ main::$0 ] 22: zp[1]:6 [ main::$3 ] 16.5: zp[2]:3 [ main::w#2 main::w#0 ] 
Uplift Scope [] 

Uplifting [main] best 788 combination reg byte x [ main::i#2 main::i#1 ] reg byte a [ main::$0 ] reg byte a [ main::$3 ] zp[2]:3 [ main::w#2 main::w#0 ] 
Uplifting [] best 788 combination 
Allocated (was zp[2]:3) zp[2]:2 [ main::w#2 main::w#0 ]

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Problem with assigning negative word constant (vwuz1=vbuc1)
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(__bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  .label screen = $400
  // @begin
__bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
__b1_from___bbegin:
  jmp __b1
  // @1
__b1:
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
main_from___b1:
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
__bend_from___b1:
  jmp __bend
  // @end
__bend:
  // main
main: {
    .label w = 2
    // [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 
    ldx #0
    jmp __b1
    // [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 
    jmp __b1
    // main::@1
  __b1:
    // [6] (word) main::w#0 ← (word)(byte) main::i#2 -- vwuz1=_word_vbuxx 
    txa
    sta.z w
    lda #0
    sta.z w+1
    // [7] (byte~) main::$0 ← (byte) main::i#2 & (byte) 1 -- vbuaa=vbuxx_band_vbuc1 
    txa
    and #1
    // [8] if((byte) 0==(byte~) main::$0) goto main::@3 -- vbuc1_eq_vbuaa_then_la1 
    cmp #0
    beq __b3_from___b1
    // [10] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
  __b2_from___b1:
    // [10] phi (word) main::w#2 = (byte) -1 [phi:main::@1->main::@2#0] -- vwuz1=vbuc1 
    lda #<-1
    sta.z w
    lda #>-1
    sta.z w+1
    jmp __b2
    // [9] phi from main::@1 to main::@3 [phi:main::@1->main::@3]
  __b3_from___b1:
    jmp __b3
    // main::@3
  __b3:
    // [10] phi from main::@3 to main::@2 [phi:main::@3->main::@2]
  __b2_from___b3:
    // [10] phi (word) main::w#2 = (word) main::w#0 [phi:main::@3->main::@2#0] -- register_copy 
    jmp __b2
    // main::@2
  __b2:
    // [11] (byte~) main::$3 ← (byte) main::i#2 << (byte) 1 -- vbuaa=vbuxx_rol_1 
    txa
    asl
    // [12] *((const word*) screen + (byte~) main::$3) ← (word) main::w#2 -- pwuc1_derefidx_vbuaa=vwuz1 
    tay
    lda.z w
    sta screen,y
    lda.z w+1
    sta screen+1,y
    // [13] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
    inx
    // [14] if((byte) main::i#1!=(byte) 8) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #8
    bne __b1_from___b2
    jmp __breturn
    // main::@return
  __breturn:
    // [15] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __bend
Removing instruction jmp __b1
Removing instruction jmp __b3
Removing instruction jmp __b2
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction lda #>-1
Succesful ASM optimization Pass5UnnecesaryLoadElimination
Replacing label __bbegin with __b1
Replacing label __b3_from___b1 with __b2
Replacing label __b1_from___b2 with __b1
Removing instruction __bbegin:
Removing instruction __b1_from___bbegin:
Removing instruction main_from___b1:
Removing instruction __bend_from___b1:
Removing instruction __b1_from___b2:
Removing instruction __b3_from___b1:
Removing instruction __b3:
Removing instruction __b2_from___b3:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __bend:
Removing instruction __b1_from_main:
Removing instruction __b2_from___b1:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Updating BasicUpstart to call main directly
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Removing instruction jmp __b1
Removing instruction jmp __b2
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction __b1:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(void()) main()
(byte~) main::$0 reg byte a 22.0
(byte~) main::$3 reg byte a 22.0
(label) main::@1
(label) main::@2
(label) main::@3
(label) main::@return
(byte) main::i
(byte) main::i#1 reg byte x 16.5
(byte) main::i#2 reg byte x 5.5
(word) main::w
(word) main::w#0 w zp[2]:2 5.5
(word) main::w#2 w zp[2]:2 11.0
(const word*) screen = (word*) 1024

reg byte x [ main::i#2 main::i#1 ]
zp[2]:2 [ main::w#2 main::w#0 ]
reg byte a [ main::$0 ]
reg byte a [ main::$3 ]


FINAL ASSEMBLER
Score: 576

  // File Comments
// Problem with assigning negative word constant (vwuz1=vbuc1)
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .label screen = $400
  // @begin
  // [1] phi from @begin to @1 [phi:@begin->@1]
  // @1
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
  // [3] phi from @1 to @end [phi:@1->@end]
  // @end
  // main
main: {
    .label w = 2
    // [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 
    ldx #0
    // [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 
    // main::@1
  __b1:
    // w = i
    // [6] (word) main::w#0 ← (word)(byte) main::i#2 -- vwuz1=_word_vbuxx 
    txa
    sta.z w
    lda #0
    sta.z w+1
    // i&1
    // [7] (byte~) main::$0 ← (byte) main::i#2 & (byte) 1 -- vbuaa=vbuxx_band_vbuc1 
    txa
    and #1
    // if(i&1)
    // [8] if((byte) 0==(byte~) main::$0) goto main::@3 -- vbuc1_eq_vbuaa_then_la1 
    cmp #0
    beq __b2
    // [10] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
    // [10] phi (word) main::w#2 = (byte) -1 [phi:main::@1->main::@2#0] -- vwuz1=vbuc1 
    lda #<-1
    sta.z w
    sta.z w+1
    // [9] phi from main::@1 to main::@3 [phi:main::@1->main::@3]
    // main::@3
    // [10] phi from main::@3 to main::@2 [phi:main::@3->main::@2]
    // [10] phi (word) main::w#2 = (word) main::w#0 [phi:main::@3->main::@2#0] -- register_copy 
    // main::@2
  __b2:
    // screen[i] = w
    // [11] (byte~) main::$3 ← (byte) main::i#2 << (byte) 1 -- vbuaa=vbuxx_rol_1 
    txa
    asl
    // [12] *((const word*) screen + (byte~) main::$3) ← (word) main::w#2 -- pwuc1_derefidx_vbuaa=vwuz1 
    tay
    lda.z w
    sta screen,y
    lda.z w+1
    sta screen+1,y
    // for( byte i:0..7)
    // [13] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
    inx
    // [14] if((byte) main::i#1!=(byte) 8) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #8
    bne __b1
    // main::@return
    // }
    // [15] return 
    rts
}
  // File Data

