
CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  main::j#0 = 0
  main::i#0 = 0
  to:main::@1
main::@1: scope:[main]  from main main::@1
  main::j#3 = phi( main/main::j#0, main::@1/main::j#2 )
  main::i#2 = phi( main/main::i#0, main::@1/main::i#1 )
  main::$1 = main::i#2 * SIZEOF_STRUCT_SEGMENT
  main::to_x#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_X)[main::$1]
  main::to_y#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_Y)[main::$1]
  SCREEN[main::j#3] = main::to_x#0
  main::j#1 = ++ main::j#3
  SCREEN[main::j#1] = main::to_y#0
  main::j#2 = ++ main::j#1
  main::i#1 = main::i#2 + rangenext(0,2)
  main::$0 = main::i#1 != rangelast(0,2)
  if(main::$0) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@1
  return 
  to:@return

void __start()
__start: scope:[__start]  from
  call main
  to:__start::@1
__start::@1: scope:[__start]  from __start
  to:__start::@return
__start::@return: scope:[__start]  from __start::@1
  return 
  to:@return

SYMBOL TABLE SSA
__constant char MOVE_TO = 0
__constant char OFFSET_STRUCT_SEGMENT_TO = 1
__constant char OFFSET_STRUCT_SPLINEVECTOR16_X = 0
__constant char OFFSET_STRUCT_SPLINEVECTOR16_Y = 1
__constant char * const SCREEN = (char *)$400
__constant char SIZEOF_STRUCT_SEGMENT = 5
__constant char SPLINE_TO = 1
void __start()
__constant struct Segment letter_c[] = { { type: MOVE_TO, to: { x: 'a', y: 'b' }, via: { x: 0, y: 0 } }, { type: SPLINE_TO, to: { x: 'c', y: 'd' }, via: { x: $67, y: $a9 } }, { type: SPLINE_TO, to: { x: 'e', y: 'f' }, via: { x: $4b, y: $c3 } } }
void main()
bool main::$0
char main::$1
char main::i
char main::i#0
char main::i#1
char main::i#2
char main::j
char main::j#0
char main::j#1
char main::j#2
char main::j#3
char main::to_x
char main::to_x#0
char main::to_y
char main::to_y#0

Simplifying constant pointer cast (char *) 1024
Successful SSA optimization PassNCastSimplification
Simple Condition main::$0 [12] if(main::i#1!=rangelast(0,2)) goto main::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant main::j#0 = 0
Constant main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Resolved ranged next value [10] main::i#1 = ++ main::i#2 to ++
Resolved ranged comparison value [12] if(main::i#1!=rangelast(0,2)) goto main::@1 to 3
Simplifying expression containing zero (char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO in [4] main::to_x#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_X)[main::$1]
Successful SSA optimization PassNSimplifyExpressionWithZero
Eliminating unused constant OFFSET_STRUCT_SPLINEVECTOR16_X
Successful SSA optimization PassNEliminateUnusedVars
Removing unused procedure __start
Removing unused procedure block __start
Removing unused procedure block __start::@1
Removing unused procedure block __start::@return
Successful SSA optimization PassNEliminateEmptyStart
Adding number conversion cast (unumber) 3 in [9] if(main::i#1!=3) goto main::@1
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast 3
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) 3
Successful SSA optimization PassNFinalizeNumberTypeConversions
Rewriting multiplication to use shift and addition[1] main::$1 = main::i#2 * SIZEOF_STRUCT_SEGMENT
Inlining constant with var siblings main::j#0
Inlining constant with var siblings main::i#0
Constant inlined main::i#0 = 0
Constant inlined main::j#0 = 0
Successful SSA optimization Pass2ConstantInlining
Alias main::$1 = main::$3 
Successful SSA optimization Pass2AliasElimination
Eliminating unused constant SIZEOF_STRUCT_SEGMENT
Successful SSA optimization PassNEliminateUnusedVars
Added new block during phi lifting main::@2(between main::@1 and main::@1)
Adding NOP phi() at start of main
CALL GRAPH

Created 2 initial phi equivalence classes
Coalesced [13] main::i#3 = main::i#1
Coalesced [14] main::j#4 = main::j#2
Coalesced down to 2 phi equivalence classes
Culled Empty Block label main::@2
Adding NOP phi() at start of main

FINAL CONTROL FLOW GRAPH

void main()
main: scope:[main]  from
  [0] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@1
  [1] main::j#3 = phi( main/0, main::@1/main::j#2 )
  [1] main::i#2 = phi( main/0, main::@1/main::i#1 )
  [2] main::$2 = main::i#2 << 2
  [3] main::$1 = main::$2 + main::i#2
  [4] main::to_x#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO)[main::$1]
  [5] main::to_y#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_Y)[main::$1]
  [6] SCREEN[main::j#3] = main::to_x#0
  [7] main::j#1 = ++ main::j#3
  [8] SCREEN[main::j#1] = main::to_y#0
  [9] main::j#2 = ++ main::j#1
  [10] main::i#1 = ++ main::i#2
  [11] if(main::i#1!=3) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@1
  [12] return 
  to:@return


VARIABLE REGISTER WEIGHTS
void main()
char main::$1 // 16.5
char main::$2 // 22.0
char main::i
char main::i#1 // 16.5
char main::i#2 // 4.888888888888889
char main::j
char main::j#1 // 16.5
char main::j#2 // 7.333333333333333
char main::j#3 // 5.5
char main::to_x
char main::to_x#0 // 11.0
char main::to_y
char main::to_y#0 // 7.333333333333333

Initial phi equivalence classes
[ main::i#2 main::i#1 ]
[ main::j#3 main::j#2 ]
Added variable main::$2 to live range equivalence class [ main::$2 ]
Added variable main::$1 to live range equivalence class [ main::$1 ]
Added variable main::to_x#0 to live range equivalence class [ main::to_x#0 ]
Added variable main::to_y#0 to live range equivalence class [ main::to_y#0 ]
Added variable main::j#1 to live range equivalence class [ main::j#1 ]
Complete equivalence classes
[ main::i#2 main::i#1 ]
[ main::j#3 main::j#2 ]
[ main::$2 ]
[ main::$1 ]
[ main::to_x#0 ]
[ main::to_y#0 ]
[ main::j#1 ]
Allocated zp[1]:2 [ main::$2 ]
Allocated zp[1]:3 [ main::i#2 main::i#1 ]
Allocated zp[1]:4 [ main::$1 ]
Allocated zp[1]:5 [ main::j#1 ]
Allocated zp[1]:6 [ main::j#3 main::j#2 ]
Allocated zp[1]:7 [ main::to_x#0 ]
Allocated zp[1]:8 [ main::to_y#0 ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [2] main::$2 = main::i#2 << 2 [ main::i#2 main::j#3 main::$2 ] (  [ main::i#2 main::j#3 main::$2 ] { }  ) always clobbers reg byte a 
Removing always clobbered register reg byte a as potential for zp[1]:3 [ main::i#2 main::i#1 ]
Removing always clobbered register reg byte a as potential for zp[1]:6 [ main::j#3 main::j#2 ]
Statement [3] main::$1 = main::$2 + main::i#2 [ main::i#2 main::j#3 main::$1 ] (  [ main::i#2 main::j#3 main::$1 ] { }  ) always clobbers reg byte a 
Statement [2] main::$2 = main::i#2 << 2 [ main::i#2 main::j#3 main::$2 ] (  [ main::i#2 main::j#3 main::$2 ] { }  ) always clobbers reg byte a 
Statement [3] main::$1 = main::$2 + main::i#2 [ main::i#2 main::j#3 main::$1 ] (  [ main::i#2 main::j#3 main::$1 ] { }  ) always clobbers reg byte a 
Potential registers zp[1]:3 [ main::i#2 main::i#1 ] : zp[1]:3 , reg byte x , reg byte y , 
Potential registers zp[1]:6 [ main::j#3 main::j#2 ] : zp[1]:6 , reg byte x , reg byte y , 
Potential registers zp[1]:2 [ main::$2 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:4 [ main::$1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:7 [ main::to_x#0 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:8 [ main::to_y#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:5 [ main::j#1 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 22: zp[1]:2 [ main::$2 ] 21.39: zp[1]:3 [ main::i#2 main::i#1 ] 16.5: zp[1]:4 [ main::$1 ] 16.5: zp[1]:5 [ main::j#1 ] 12.83: zp[1]:6 [ main::j#3 main::j#2 ] 11: zp[1]:7 [ main::to_x#0 ] 7.33: zp[1]:8 [ main::to_y#0 ] 
Uplift Scope [SplineVector16] 
Uplift Scope [Segment] 
Uplift Scope [Segment::SegmentType] 
Uplift Scope [] 

Uplifting [main] best 921 combination reg byte a [ main::$2 ] reg byte x [ main::i#2 main::i#1 ] reg byte y [ main::$1 ] zp[1]:5 [ main::j#1 ] zp[1]:6 [ main::j#3 main::j#2 ] zp[1]:7 [ main::to_x#0 ] zp[1]:8 [ main::to_y#0 ] 
Limited combination testing to 100 combinations of 9216 possible.
Uplifting [SplineVector16] best 921 combination 
Uplifting [Segment] best 921 combination 
Uplifting [Segment::SegmentType] best 921 combination 
Uplifting [] best 921 combination 
Attempting to uplift remaining variables inzp[1]:5 [ main::j#1 ]
Uplifting [main] best 831 combination reg byte y [ main::j#1 ] 
Attempting to uplift remaining variables inzp[1]:6 [ main::j#3 main::j#2 ]
Uplifting [main] best 831 combination zp[1]:6 [ main::j#3 main::j#2 ] 
Attempting to uplift remaining variables inzp[1]:7 [ main::to_x#0 ]
Uplifting [main] best 831 combination zp[1]:7 [ main::to_x#0 ] 
Attempting to uplift remaining variables inzp[1]:8 [ main::to_y#0 ]
Uplifting [main] best 831 combination zp[1]:8 [ main::to_y#0 ] 
Allocated (was zp[1]:6) zp[1]:2 [ main::j#3 main::j#2 ]
Allocated (was zp[1]:7) zp[1]:3 [ main::to_x#0 ]
Allocated (was zp[1]:8) zp[1]:4 [ main::to_y#0 ]

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Complex C-struct - copying a sub-struct from C-standard layout to Unwound layout
  // Upstart
  // Commodore 64 PRG executable file
.file [name="struct-37.prg", type="prg", segments="Program"]
.segmentdef Program [segments="Basic, Code, Data"]
.segmentdef Basic [start=$0801]
.segmentdef Code [start=$80d]
.segmentdef Data [startAfter="Code"]
.segment Basic
:BasicUpstart(main)
  // Global Constants & labels
  .const MOVE_TO = 0
  .const SPLINE_TO = 1
  .const OFFSET_STRUCT_SEGMENT_TO = 1
  .const OFFSET_STRUCT_SPLINEVECTOR16_Y = 1
  .label SCREEN = $400
.segment Code
  // main
main: {
    .label to_x = 3
    .label to_y = 4
    .label j = 2
    // [1] phi from main to main::@1 [phi:main->main::@1]
  __b1_from_main:
    // [1] phi main::j#3 = 0 [phi:main->main::@1#0] -- vbuz1=vbuc1 
    lda #0
    sta.z j
    // [1] phi main::i#2 = 0 [phi:main->main::@1#1] -- vbuxx=vbuc1 
    ldx #0
    jmp __b1
    // [1] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
  __b1_from___b1:
    // [1] phi main::j#3 = main::j#2 [phi:main::@1->main::@1#0] -- register_copy 
    // [1] phi main::i#2 = main::i#1 [phi:main::@1->main::@1#1] -- register_copy 
    jmp __b1
    // main::@1
  __b1:
    // [2] main::$2 = main::i#2 << 2 -- vbuaa=vbuxx_rol_2 
    txa
    asl
    asl
    // [3] main::$1 = main::$2 + main::i#2 -- vbuyy=vbuaa_plus_vbuxx 
    stx.z $ff
    clc
    adc.z $ff
    tay
    // [4] main::to_x#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO)[main::$1] -- vbuz1=pbuc1_derefidx_vbuyy 
    lda letter_c+OFFSET_STRUCT_SEGMENT_TO,y
    sta.z to_x
    // [5] main::to_y#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_Y)[main::$1] -- vbuz1=pbuc1_derefidx_vbuyy 
    lda letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_Y,y
    sta.z to_y
    // [6] SCREEN[main::j#3] = main::to_x#0 -- pbuc1_derefidx_vbuz1=vbuz2 
    lda.z to_x
    ldy.z j
    sta SCREEN,y
    // [7] main::j#1 = ++ main::j#3 -- vbuyy=_inc_vbuz1 
    ldy.z j
    iny
    // [8] SCREEN[main::j#1] = main::to_y#0 -- pbuc1_derefidx_vbuyy=vbuz1 
    lda.z to_y
    sta SCREEN,y
    // [9] main::j#2 = ++ main::j#1 -- vbuz1=_inc_vbuyy 
    iny
    sty.z j
    // [10] main::i#1 = ++ main::i#2 -- vbuxx=_inc_vbuxx 
    inx
    // [11] if(main::i#1!=3) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #3
    bne __b1_from___b1
    jmp __breturn
    // main::@return
  __breturn:
    // [12] return 
    rts
}
  // File Data
.segment Data
  // True type letter c
  letter_c: .byte MOVE_TO, 'a', 'b', 0, 0, SPLINE_TO, 'c', 'd', $67, $a9, SPLINE_TO, 'e', 'f', $4b, $c3

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing instruction ldx #0 with TAX
Removing instruction ldy.z j
Succesful ASM optimization Pass5UnnecesaryLoadElimination
Replacing label __b1_from___b1 with __b1
Removing instruction __b1_from___b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __b1_from_main:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Removing instruction jmp __b1
Succesful ASM optimization Pass5NextJumpElimination

FINAL SYMBOL TABLE
__constant char MOVE_TO = 0
__constant char OFFSET_STRUCT_SEGMENT_TO = 1
__constant char OFFSET_STRUCT_SPLINEVECTOR16_Y = 1
__constant char * const SCREEN = (char *) 1024
__constant char SPLINE_TO = 1
__constant struct Segment letter_c[] = { { type: MOVE_TO, to: { x: 'a', y: 'b' }, via: { x: 0, y: 0 } }, { type: SPLINE_TO, to: { x: 'c', y: 'd' }, via: { x: $67, y: $a9 } }, { type: SPLINE_TO, to: { x: 'e', y: 'f' }, via: { x: $4b, y: $c3 } } }
void main()
char main::$1 // reg byte y 16.5
char main::$2 // reg byte a 22.0
char main::i
char main::i#1 // reg byte x 16.5
char main::i#2 // reg byte x 4.888888888888889
char main::j
char main::j#1 // reg byte y 16.5
char main::j#2 // j zp[1]:2 7.333333333333333
char main::j#3 // j zp[1]:2 5.5
char main::to_x
char main::to_x#0 // to_x zp[1]:3 11.0
char main::to_y
char main::to_y#0 // to_y zp[1]:4 7.333333333333333

reg byte x [ main::i#2 main::i#1 ]
zp[1]:2 [ main::j#3 main::j#2 ]
reg byte a [ main::$2 ]
reg byte y [ main::$1 ]
zp[1]:3 [ main::to_x#0 ]
zp[1]:4 [ main::to_y#0 ]
reg byte y [ main::j#1 ]


FINAL ASSEMBLER
Score: 711

  // File Comments
// Complex C-struct - copying a sub-struct from C-standard layout to Unwound layout
  // Upstart
  // Commodore 64 PRG executable file
.file [name="struct-37.prg", type="prg", segments="Program"]
.segmentdef Program [segments="Basic, Code, Data"]
.segmentdef Basic [start=$0801]
.segmentdef Code [start=$80d]
.segmentdef Data [startAfter="Code"]
.segment Basic
:BasicUpstart(main)
  // Global Constants & labels
  .const MOVE_TO = 0
  .const SPLINE_TO = 1
  .const OFFSET_STRUCT_SEGMENT_TO = 1
  .const OFFSET_STRUCT_SPLINEVECTOR16_Y = 1
  .label SCREEN = $400
.segment Code
  // main
main: {
    .label to_x = 3
    .label to_y = 4
    .label j = 2
    // [1] phi from main to main::@1 [phi:main->main::@1]
    // [1] phi main::j#3 = 0 [phi:main->main::@1#0] -- vbuz1=vbuc1 
    lda #0
    sta.z j
    // [1] phi main::i#2 = 0 [phi:main->main::@1#1] -- vbuxx=vbuc1 
    tax
    // [1] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
    // [1] phi main::j#3 = main::j#2 [phi:main::@1->main::@1#0] -- register_copy 
    // [1] phi main::i#2 = main::i#1 [phi:main::@1->main::@1#1] -- register_copy 
    // main::@1
  __b1:
    // struct SplineVector16 to = letter_c[i].to
    // [2] main::$2 = main::i#2 << 2 -- vbuaa=vbuxx_rol_2 
    txa
    asl
    asl
    // [3] main::$1 = main::$2 + main::i#2 -- vbuyy=vbuaa_plus_vbuxx 
    stx.z $ff
    clc
    adc.z $ff
    tay
    // [4] main::to_x#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO)[main::$1] -- vbuz1=pbuc1_derefidx_vbuyy 
    lda letter_c+OFFSET_STRUCT_SEGMENT_TO,y
    sta.z to_x
    // [5] main::to_y#0 = ((char *)(struct SplineVector16 *)letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_Y)[main::$1] -- vbuz1=pbuc1_derefidx_vbuyy 
    lda letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_Y,y
    sta.z to_y
    // SCREEN[j++] = to.x
    // [6] SCREEN[main::j#3] = main::to_x#0 -- pbuc1_derefidx_vbuz1=vbuz2 
    lda.z to_x
    ldy.z j
    sta SCREEN,y
    // SCREEN[j++] = to.x;
    // [7] main::j#1 = ++ main::j#3 -- vbuyy=_inc_vbuz1 
    iny
    // SCREEN[j++] = to.y
    // [8] SCREEN[main::j#1] = main::to_y#0 -- pbuc1_derefidx_vbuyy=vbuz1 
    lda.z to_y
    sta SCREEN,y
    // SCREEN[j++] = to.y;
    // [9] main::j#2 = ++ main::j#1 -- vbuz1=_inc_vbuyy 
    iny
    sty.z j
    // for( byte i: 0..2)
    // [10] main::i#1 = ++ main::i#2 -- vbuxx=_inc_vbuxx 
    inx
    // [11] if(main::i#1!=3) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #3
    bne __b1
    // main::@return
    // }
    // [12] return 
    rts
}
  // File Data
.segment Data
  // True type letter c
  letter_c: .byte MOVE_TO, 'a', 'b', 0, 0, SPLINE_TO, 'c', 'd', $67, $a9, SPLINE_TO, 'e', 'f', $4b, $c3

