CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  main::i#0 = 0
  to:main::@1
main::@1: scope:[main]  from main main::@2
  main::i#2 = phi( main/main::i#0, main::@2/main::i#1 )
  main::$0 = main::i#2 < $19
  if(main::$0) goto main::@2
  to:main::@return
main::@2: scope:[main]  from main::@1
  main::i#3 = phi( main::@1/main::i#2 )
  main::$1 = main::i#3 * SIZEOF_STRUCT_BALL
  ((byte*)balls+OFFSET_STRUCT_BALL_POS)[main::$1] = ((byte*)balls+OFFSET_STRUCT_BALL_POS)[main::$1] + ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$1]
  main::$2 = main::i#3 * SIZEOF_STRUCT_BALL
  ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] = ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] + $a
  main::$3 = main::i#3 * SIZEOF_STRUCT_BALL
  ((byte*)balls+OFFSET_STRUCT_BALL_SYM)[main::$3] = '*'
  main::i#1 = ++ main::i#3
  to:main::@1
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
const byte OFFSET_STRUCT_BALL_POS = 0
const byte OFFSET_STRUCT_BALL_SYM = 2
const byte OFFSET_STRUCT_BALL_VEL = 1
const byte SIZEOF_STRUCT_BALL = 3
void __start()
const struct Ball* balls[$19]  = { fill( $19, 0) }
void main()
bool~ main::$0
byte~ main::$1
byte~ main::$2
byte~ main::$3
byte main::i
byte main::i#0
byte main::i#1
byte main::i#2
byte main::i#3

Adding number conversion cast (unumber) $19 in main::$0 = main::i#2 < $19
Adding number conversion cast (unumber) $a in ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] = ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] + $a
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast $19
Simplifying constant integer cast $a
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type $19
Finalized unsigned number type $a
Successful SSA optimization PassNFinalizeNumberTypeConversions
Alias main::i#2 = main::i#3 
Successful SSA optimization Pass2AliasElimination
Identified duplicate assignment right side [7] main::$2 = main::i#2 * SIZEOF_STRUCT_BALL
Identified duplicate assignment right side [9] main::$3 = main::i#2 * SIZEOF_STRUCT_BALL
Successful SSA optimization Pass2DuplicateRValueIdentification
Simple Condition main::$0 [3] if(main::i#2<$19) goto main::@2
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Simplifying expression containing zero (byte*)balls in [5] ((byte*)balls+OFFSET_STRUCT_BALL_POS)[main::$1] = ((byte*)balls+OFFSET_STRUCT_BALL_POS)[main::$1] + ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$1]
Simplifying expression containing zero (byte*)balls in [5] ((byte*)balls+OFFSET_STRUCT_BALL_POS)[main::$1] = ((byte*)balls)[main::$1] + ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$1]
Successful SSA optimization PassNSimplifyExpressionWithZero
Eliminating unused constant OFFSET_STRUCT_BALL_POS
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
Alias main::$2 = main::$1 main::$3 
Successful SSA optimization Pass2AliasElimination
Rewriting multiplication to use shift and addition[2] main::$2 = main::i#2 * SIZEOF_STRUCT_BALL
Inlining constant with var siblings main::i#0
Constant inlined main::i#0 = 0
Successful SSA optimization Pass2ConstantInlining
Alias main::$2 = main::$5 
Successful SSA optimization Pass2AliasElimination
Eliminating unused constant SIZEOF_STRUCT_BALL
Successful SSA optimization PassNEliminateUnusedVars
Adding NOP phi() at start of main
CALL GRAPH

Created 1 initial phi equivalence classes
Coalesced [10] main::i#4 = main::i#1
Coalesced down to 1 phi equivalence classes
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::@2
  [1] main::i#2 = phi( main/0, main::@2/main::i#1 )
  [2] if(main::i#2<$19) goto main::@2
  to:main::@return
main::@return: scope:[main]  from main::@1
  [3] return 
  to:@return
main::@2: scope:[main]  from main::@1
  [4] main::$4 = main::i#2 << 1
  [5] main::$2 = main::$4 + main::i#2
  [6] ((byte*)balls)[main::$2] = ((byte*)balls)[main::$2] + ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2]
  [7] ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] = ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] + $a
  [8] ((byte*)balls+OFFSET_STRUCT_BALL_SYM)[main::$2] = '*'
  [9] main::i#1 = ++ main::i#2
  to:main::@1


VARIABLE REGISTER WEIGHTS
void main()
byte~ main::$2 25.666666666666668
byte~ main::$4 22.0
byte main::i
byte main::i#1 22.0
byte main::i#2 7.857142857142857

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

REGISTER UPLIFT SCOPES
Uplift Scope [main] 29.86: zp[1]:2 [ main::i#2 main::i#1 ] 25.67: zp[1]:4 [ main::$2 ] 22: zp[1]:3 [ main::$4 ] 
Uplift Scope [Ball] 
Uplift Scope [] 

Uplifting [main] best 686 combination reg byte y [ main::i#2 main::i#1 ] reg byte x [ main::$2 ] reg byte a [ main::$4 ] 
Uplifting [Ball] best 686 combination 
Uplifting [] best 686 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Test array index pointer rewriting
// struct array with 8bit index
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const OFFSET_STRUCT_BALL_VEL = 1
  .const OFFSET_STRUCT_BALL_SYM = 2
  // main
main: {
    // [1] phi from main to main::@1 [phi:main->main::@1]
  __b1_from_main:
    // [1] phi main::i#2 = 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
    ldy #0
    jmp __b1
    // main::@1
  __b1:
    // [2] if(main::i#2<$19) goto main::@2 -- vbuyy_lt_vbuc1_then_la1 
    cpy #$19
    bcc __b2
    jmp __breturn
    // main::@return
  __breturn:
    // [3] return 
    rts
    // main::@2
  __b2:
    // [4] main::$4 = main::i#2 << 1 -- vbuaa=vbuyy_rol_1 
    tya
    asl
    // [5] main::$2 = main::$4 + main::i#2 -- vbuxx=vbuaa_plus_vbuyy 
    sty.z $ff
    clc
    adc.z $ff
    tax
    // [6] ((byte*)balls)[main::$2] = ((byte*)balls)[main::$2] + ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] -- pbuc1_derefidx_vbuxx=pbuc1_derefidx_vbuxx_plus_pbuc2_derefidx_vbuxx 
    lda balls,x
    clc
    adc balls+OFFSET_STRUCT_BALL_VEL,x
    sta balls,x
    // [7] ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] = ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] + $a -- pbuc1_derefidx_vbuxx=pbuc1_derefidx_vbuxx_plus_vbuc2 
    lda #$a
    clc
    adc balls+OFFSET_STRUCT_BALL_VEL,x
    sta balls+OFFSET_STRUCT_BALL_VEL,x
    // [8] ((byte*)balls+OFFSET_STRUCT_BALL_SYM)[main::$2] = '*' -- pbuc1_derefidx_vbuxx=vbuc2 
    lda #'*'
    sta balls+OFFSET_STRUCT_BALL_SYM,x
    // [9] main::i#1 = ++ main::i#2 -- vbuyy=_inc_vbuyy 
    iny
    // [1] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  __b1_from___b2:
    // [1] phi main::i#2 = main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
    jmp __b1
}
  // File Data
  balls: .fill 3*$19, 0

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction __b1_from_main:
Removing instruction __breturn:
Removing instruction __b1_from___b2:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
const byte OFFSET_STRUCT_BALL_SYM = 2
const byte OFFSET_STRUCT_BALL_VEL = 1
const struct Ball* balls[$19]  = { fill( $19, 0) }
void main()
byte~ main::$2 reg byte x 25.666666666666668
byte~ main::$4 reg byte a 22.0
byte main::i
byte main::i#1 reg byte y 22.0
byte main::i#2 reg byte y 7.857142857142857

reg byte y [ main::i#2 main::i#1 ]
reg byte a [ main::$4 ]
reg byte x [ main::$2 ]


FINAL ASSEMBLER
Score: 626

  // File Comments
// Test array index pointer rewriting
// struct array with 8bit index
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const OFFSET_STRUCT_BALL_VEL = 1
  .const OFFSET_STRUCT_BALL_SYM = 2
  // main
main: {
    // [1] phi from main to main::@1 [phi:main->main::@1]
    // [1] phi main::i#2 = 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
    ldy #0
    // main::@1
  __b1:
    // for(char i=0;i<NUM_BALLS;i++)
    // [2] if(main::i#2<$19) goto main::@2 -- vbuyy_lt_vbuc1_then_la1 
    cpy #$19
    bcc __b2
    // main::@return
    // }
    // [3] return 
    rts
    // main::@2
  __b2:
    // balls[i].pos += balls[i].vel
    // [4] main::$4 = main::i#2 << 1 -- vbuaa=vbuyy_rol_1 
    tya
    asl
    // [5] main::$2 = main::$4 + main::i#2 -- vbuxx=vbuaa_plus_vbuyy 
    sty.z $ff
    clc
    adc.z $ff
    tax
    // [6] ((byte*)balls)[main::$2] = ((byte*)balls)[main::$2] + ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] -- pbuc1_derefidx_vbuxx=pbuc1_derefidx_vbuxx_plus_pbuc2_derefidx_vbuxx 
    lda balls,x
    clc
    adc balls+OFFSET_STRUCT_BALL_VEL,x
    sta balls,x
    // balls[i].vel += 10
    // [7] ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] = ((byte*)balls+OFFSET_STRUCT_BALL_VEL)[main::$2] + $a -- pbuc1_derefidx_vbuxx=pbuc1_derefidx_vbuxx_plus_vbuc2 
    lda #$a
    clc
    adc balls+OFFSET_STRUCT_BALL_VEL,x
    sta balls+OFFSET_STRUCT_BALL_VEL,x
    // balls[i].sym ='*'
    // [8] ((byte*)balls+OFFSET_STRUCT_BALL_SYM)[main::$2] = '*' -- pbuc1_derefidx_vbuxx=vbuc2 
    lda #'*'
    sta balls+OFFSET_STRUCT_BALL_SYM,x
    // for(char i=0;i<NUM_BALLS;i++)
    // [9] main::i#1 = ++ main::i#2 -- vbuyy=_inc_vbuyy 
    iny
    // [1] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
    // [1] phi main::i#2 = main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
    jmp __b1
}
  // File Data
  balls: .fill 3*$19, 0