
CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  main::idx#0 = 0
  to:main::@1
main::@1: scope:[main]  from main main::@2
  main::idx#2 = phi( main/main::idx#0, main::@2/main::idx#1 )
  getValue::index#0 = main::idx#2
  call getValue
  getValue::return#0 = getValue::return#2
  to:main::@2
main::@2: scope:[main]  from main::@1
  main::idx#3 = phi( main::@1/main::idx#2 )
  getValue::return#3 = phi( main::@1/getValue::return#0 )
  main::$0 = getValue::return#3
  main::$2 = main::idx#3 * SIZEOF_UNSIGNED_INT
  main::SCREEN[main::$2] = main::$0
  main::idx#1 = main::idx#3 + rangenext(0,$80)
  main::$1 = main::idx#1 != rangelast(0,$80)
  if(main::$1) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@2
  return 
  to:@return

unsigned int getValue(unsigned int index)
getValue: scope:[getValue]  from main::@1
  getValue::index#1 = phi( main::@1/getValue::index#0 )
  getValue::$0 = getValue::index#1 & $7f
  getValue::$3 = getValue::$0 * SIZEOF_UNSIGNED_INT
  getValue::$1 = arr16[getValue::$3] & $ff
  getValue::$2 = getValue::$1 >> 1
  getValue::return#1 = (unsigned int)getValue::$2
  to:getValue::@return
getValue::@return: scope:[getValue]  from getValue
  getValue::return#4 = phi( getValue/getValue::return#1 )
  getValue::return#2 = getValue::return#4
  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 SIZEOF_UNSIGNED_INT = 2
void __start()
__constant unsigned int arr16[$80] = { fill( $80, 0) }
unsigned int getValue(unsigned int index)
number getValue::$0
number getValue::$1
number getValue::$2
number getValue::$3
unsigned int getValue::index
unsigned int getValue::index#0
unsigned int getValue::index#1
unsigned int getValue::return
unsigned int getValue::return#0
unsigned int getValue::return#1
unsigned int getValue::return#2
unsigned int getValue::return#3
unsigned int getValue::return#4
void main()
unsigned int main::$0
bool main::$1
char main::$2
__constant unsigned int *main::SCREEN = (unsigned int *)$400
char main::idx
char main::idx#0
char main::idx#1
char main::idx#2
char main::idx#3

Adding number conversion cast (unumber) $7f in getValue::$0 = getValue::index#1 & $7f
Adding number conversion cast (unumber) getValue::$0 in getValue::$0 = getValue::index#1 & (unumber)$7f
Adding number conversion cast (unumber) getValue::$3 in getValue::$3 = getValue::$0 * SIZEOF_UNSIGNED_INT
Adding number conversion cast (unumber) $ff in getValue::$1 = arr16[getValue::$3] & $ff
Adding number conversion cast (unumber) getValue::$1 in getValue::$1 = arr16[getValue::$3] & (unumber)$ff
Adding number conversion cast (unumber) 1 in getValue::$2 = getValue::$1 >> 1
Adding number conversion cast (unumber) getValue::$2 in getValue::$2 = getValue::$1 >> (unumber)1
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant pointer cast (unsigned int *) 1024
Simplifying constant integer cast $7f
Simplifying constant integer cast $ff
Simplifying constant integer cast 1
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) $7f
Finalized unsigned number type (char) $ff
Finalized unsigned number type (char) 1
Successful SSA optimization PassNFinalizeNumberTypeConversions
Inferred type updated to char in getValue::$0 = getValue::index#1 & $7f
Inferred type updated to char in getValue::$3 = getValue::$0 * SIZEOF_UNSIGNED_INT
Inferred type updated to char in getValue::$1 = arr16[getValue::$3] & $ff
Inferred type updated to char in getValue::$2 = getValue::$1 >> 1
Alias getValue::return#0 = getValue::return#3 
Alias main::idx#2 = main::idx#3 
Alias getValue::return#1 = getValue::return#4 getValue::return#2 
Successful SSA optimization Pass2AliasElimination
Identical Phi Values getValue::index#1 getValue::index#0
Successful SSA optimization Pass2IdenticalPhiElimination
Simple Condition main::$1 [10] if(main::idx#1!=rangelast(0,$80)) goto main::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant main::idx#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Resolved ranged next value [8] main::idx#1 = ++ main::idx#2 to ++
Resolved ranged comparison value [10] if(main::idx#1!=rangelast(0,$80)) goto main::@1 to $81
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) $81 in [8] if(main::idx#1!=$81) goto main::@1
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast $81
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) $81
Successful SSA optimization PassNFinalizeNumberTypeConversions
Rewriting multiplication to use shift [5] main::$2 = main::idx#2 * SIZEOF_UNSIGNED_INT
Rewriting multiplication to use shift [11] getValue::$3 = getValue::$0 * SIZEOF_UNSIGNED_INT
Successful SSA optimization Pass2MultiplyToShiftRewriting
Inlining constant with var siblings main::idx#0
Constant inlined main::idx#0 = 0
Successful SSA optimization Pass2ConstantInlining
Eliminating unused constant SIZEOF_UNSIGNED_INT
Successful SSA optimization PassNEliminateUnusedVars
Finalized unsigned number type (char) $80
Finalized unsigned number type (char) $80
Successful SSA optimization PassNFinalizeNumberTypeConversions
Added new block during phi lifting main::@3(between main::@2 and main::@1)
Adding NOP phi() at start of main
CALL GRAPH
Calls in [main] to getValue:3 

Created 1 initial phi equivalence classes
Coalesced [11] main::idx#4 = main::idx#1
Coalesced down to 1 phi equivalence classes
Culled Empty Block label main::@3
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::idx#2 = phi( main/0, main::@2/main::idx#1 )
  [2] getValue::index#0 = main::idx#2
  [3] call getValue
  [4] getValue::return#0 = getValue::return#1
  to:main::@2
main::@2: scope:[main]  from main::@1
  [5] main::$0 = getValue::return#0
  [6] main::$2 = main::idx#2 << 1
  [7] main::SCREEN[main::$2] = main::$0
  [8] main::idx#1 = ++ main::idx#2
  [9] if(main::idx#1!=$81) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@2
  [10] return 
  to:@return

unsigned int getValue(unsigned int index)
getValue: scope:[getValue]  from main::@1
  [11] getValue::$0 = getValue::index#0 & $7f
  [12] getValue::$3 = getValue::$0 << 1
  [13] getValue::$1 = arr16[getValue::$3] & $ff
  [14] getValue::$2 = getValue::$1 >> 1
  [15] getValue::return#1 = (unsigned int)getValue::$2
  to:getValue::@return
getValue::@return: scope:[getValue]  from getValue
  [16] return 
  to:@return


VARIABLE REGISTER WEIGHTS
unsigned int getValue(unsigned int index)
char getValue::$0 // 202.0
char getValue::$1 // 202.0
char getValue::$2 // 101.0
char getValue::$3 // 202.0
unsigned int getValue::index
unsigned int getValue::index#0 // 112.0
unsigned int getValue::return
unsigned int getValue::return#0 // 22.0
unsigned int getValue::return#1 // 37.33333333333333
void main()
unsigned int main::$0 // 11.0
char main::$2 // 22.0
char main::idx
char main::idx#1 // 16.5
char main::idx#2 // 6.285714285714286

Initial phi equivalence classes
[ main::idx#2 main::idx#1 ]
Added variable getValue::index#0 to live range equivalence class [ getValue::index#0 ]
Added variable getValue::return#0 to live range equivalence class [ getValue::return#0 ]
Added variable main::$0 to live range equivalence class [ main::$0 ]
Added variable main::$2 to live range equivalence class [ main::$2 ]
Added variable getValue::$0 to live range equivalence class [ getValue::$0 ]
Added variable getValue::$3 to live range equivalence class [ getValue::$3 ]
Added variable getValue::$1 to live range equivalence class [ getValue::$1 ]
Added variable getValue::$2 to live range equivalence class [ getValue::$2 ]
Added variable getValue::return#1 to live range equivalence class [ getValue::return#1 ]
Complete equivalence classes
[ main::idx#2 main::idx#1 ]
[ getValue::index#0 ]
[ getValue::return#0 ]
[ main::$0 ]
[ main::$2 ]
[ getValue::$0 ]
[ getValue::$3 ]
[ getValue::$1 ]
[ getValue::$2 ]
[ getValue::return#1 ]
Allocated zp[1]:2 [ getValue::$0 ]
Allocated zp[1]:3 [ getValue::$3 ]
Allocated zp[1]:4 [ getValue::$1 ]
Allocated zp[2]:5 [ getValue::index#0 ]
Allocated zp[1]:7 [ getValue::$2 ]
Allocated zp[2]:8 [ getValue::return#1 ]
Allocated zp[1]:10 [ main::idx#2 main::idx#1 ]
Allocated zp[2]:11 [ getValue::return#0 ]
Allocated zp[1]:13 [ main::$2 ]
Allocated zp[2]:14 [ main::$0 ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [2] getValue::index#0 = main::idx#2 [ main::idx#2 getValue::index#0 ] (  [ main::idx#2 getValue::index#0 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Removing always clobbered register reg byte a as potential for zp[1]:10 [ main::idx#2 main::idx#1 ]
Statement [4] getValue::return#0 = getValue::return#1 [ main::idx#2 getValue::return#0 ] (  [ main::idx#2 getValue::return#0 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [5] main::$0 = getValue::return#0 [ main::idx#2 main::$0 ] (  [ main::idx#2 main::$0 ] { }  ) always clobbers reg byte a 
Statement [6] main::$2 = main::idx#2 << 1 [ main::idx#2 main::$0 main::$2 ] (  [ main::idx#2 main::$0 main::$2 ] { }  ) always clobbers reg byte a 
Statement [7] main::SCREEN[main::$2] = main::$0 [ main::idx#2 ] (  [ main::idx#2 ] { }  ) always clobbers reg byte a 
Statement [11] getValue::$0 = getValue::index#0 & $7f [ getValue::$0 ] ( getValue:3 [ main::idx#2 getValue::$0 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [12] getValue::$3 = getValue::$0 << 1 [ getValue::$3 ] ( getValue:3 [ main::idx#2 getValue::$3 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [13] getValue::$1 = arr16[getValue::$3] & $ff [ getValue::$1 ] ( getValue:3 [ main::idx#2 getValue::$1 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [14] getValue::$2 = getValue::$1 >> 1 [ getValue::$2 ] ( getValue:3 [ main::idx#2 getValue::$2 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [15] getValue::return#1 = (unsigned int)getValue::$2 [ getValue::return#1 ] ( getValue:3 [ main::idx#2 getValue::return#1 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [2] getValue::index#0 = main::idx#2 [ main::idx#2 getValue::index#0 ] (  [ main::idx#2 getValue::index#0 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [4] getValue::return#0 = getValue::return#1 [ main::idx#2 getValue::return#0 ] (  [ main::idx#2 getValue::return#0 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [5] main::$0 = getValue::return#0 [ main::idx#2 main::$0 ] (  [ main::idx#2 main::$0 ] { }  ) always clobbers reg byte a 
Statement [6] main::$2 = main::idx#2 << 1 [ main::idx#2 main::$0 main::$2 ] (  [ main::idx#2 main::$0 main::$2 ] { }  ) always clobbers reg byte a 
Statement [7] main::SCREEN[main::$2] = main::$0 [ main::idx#2 ] (  [ main::idx#2 ] { }  ) always clobbers reg byte a 
Statement [11] getValue::$0 = getValue::index#0 & $7f [ getValue::$0 ] ( getValue:3 [ main::idx#2 getValue::$0 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [12] getValue::$3 = getValue::$0 << 1 [ getValue::$3 ] ( getValue:3 [ main::idx#2 getValue::$3 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [13] getValue::$1 = arr16[getValue::$3] & $ff [ getValue::$1 ] ( getValue:3 [ main::idx#2 getValue::$1 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [14] getValue::$2 = getValue::$1 >> 1 [ getValue::$2 ] ( getValue:3 [ main::idx#2 getValue::$2 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Statement [15] getValue::return#1 = (unsigned int)getValue::$2 [ getValue::return#1 ] ( getValue:3 [ main::idx#2 getValue::return#1 ] { { getValue::index#0 = main::idx#2 } { getValue::return#0 = getValue::return#1 } }  ) always clobbers reg byte a 
Potential registers zp[1]:10 [ main::idx#2 main::idx#1 ] : zp[1]:10 , reg byte x , reg byte y , 
Potential registers zp[2]:5 [ getValue::index#0 ] : zp[2]:5 , 
Potential registers zp[2]:11 [ getValue::return#0 ] : zp[2]:11 , 
Potential registers zp[2]:14 [ main::$0 ] : zp[2]:14 , 
Potential registers zp[1]:13 [ main::$2 ] : zp[1]:13 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:2 [ getValue::$0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:3 [ getValue::$3 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:4 [ getValue::$1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[1]:7 [ getValue::$2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
Potential registers zp[2]:8 [ getValue::return#1 ] : zp[2]:8 , 

REGISTER UPLIFT SCOPES
Uplift Scope [getValue] 202: zp[1]:2 [ getValue::$0 ] 202: zp[1]:3 [ getValue::$3 ] 202: zp[1]:4 [ getValue::$1 ] 112: zp[2]:5 [ getValue::index#0 ] 101: zp[1]:7 [ getValue::$2 ] 37.33: zp[2]:8 [ getValue::return#1 ] 22: zp[2]:11 [ getValue::return#0 ] 
Uplift Scope [main] 22.79: zp[1]:10 [ main::idx#2 main::idx#1 ] 22: zp[1]:13 [ main::$2 ] 11: zp[2]:14 [ main::$0 ] 
Uplift Scope [] 

Uplifting [getValue] best 1015 combination reg byte a [ getValue::$0 ] reg byte a [ getValue::$3 ] reg byte a [ getValue::$1 ] zp[2]:5 [ getValue::index#0 ] reg byte a [ getValue::$2 ] zp[2]:8 [ getValue::return#1 ] zp[2]:11 [ getValue::return#0 ] 
Limited combination testing to 100 combinations of 256 possible.
Uplifting [main] best 865 combination reg byte x [ main::idx#2 main::idx#1 ] reg byte a [ main::$2 ] zp[2]:14 [ main::$0 ] 
Uplifting [] best 865 combination 
Coalescing zero page register [ zp[2]:11 [ getValue::return#0 ] ] with [ zp[2]:14 [ main::$0 ] ] - score: 1
Coalescing zero page register [ zp[2]:11 [ getValue::return#0 main::$0 ] ] with [ zp[2]:8 [ getValue::return#1 ] ] - score: 1
Allocated (was zp[2]:5) zp[2]:2 [ getValue::index#0 ]
Allocated (was zp[2]:11) zp[2]:4 [ getValue::return#0 main::$0 getValue::return#1 ]

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Test KickC performance for 16-bit array lookup function from article "Optimizing C array lookups for the 6502"
// http://8bitworkshop.com/blog/compilers/2019/03/17/cc65-optimization.html
  // Upstart
  // Commodore 64 PRG executable file
.file [name="array-16bit-lookup.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
.segment Code
  // main
main: {
    .label SCREEN = $400
    .label __0 = 4
    // [1] phi from main to main::@1 [phi:main->main::@1]
  __b1_from_main:
    // [1] phi main::idx#2 = 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
    ldx #0
    jmp __b1
    // [1] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  __b1_from___b2:
    // [1] phi main::idx#2 = main::idx#1 [phi:main::@2->main::@1#0] -- register_copy 
    jmp __b1
    // main::@1
  __b1:
    // [2] getValue::index#0 = main::idx#2 -- vwuz1=vbuxx 
    txa
    sta.z getValue.index
    lda #0
    sta.z getValue.index+1
    // [3] call getValue
    jsr getValue
    // [4] getValue::return#0 = getValue::return#1
    jmp __b2
    // main::@2
  __b2:
    // [5] main::$0 = getValue::return#0
    // [6] main::$2 = main::idx#2 << 1 -- vbuaa=vbuxx_rol_1 
    txa
    asl
    // [7] main::SCREEN[main::$2] = main::$0 -- pwuc1_derefidx_vbuaa=vwuz1 
    tay
    lda.z __0
    sta SCREEN,y
    lda.z __0+1
    sta SCREEN+1,y
    // [8] main::idx#1 = ++ main::idx#2 -- vbuxx=_inc_vbuxx 
    inx
    // [9] if(main::idx#1!=$81) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #$81
    bne __b1_from___b2
    jmp __breturn
    // main::@return
  __breturn:
    // [10] return 
    rts
}
  // getValue
// __zp(4) unsigned int getValue(__zp(2) unsigned int index)
getValue: {
    .label index = 2
    .label return = 4
    // [11] getValue::$0 = getValue::index#0 & $7f -- vbuaa=vwuz1_band_vbuc1 
    lda #$7f
    and.z index
    // [12] getValue::$3 = getValue::$0 << 1 -- vbuaa=vbuaa_rol_1 
    asl
    // [13] getValue::$1 = arr16[getValue::$3] & $ff -- vbuaa=pwuc1_derefidx_vbuaa_band_vbuc2 
    tay
    lda #$ff
    and arr16,y
    // [14] getValue::$2 = getValue::$1 >> 1 -- vbuaa=vbuaa_ror_1 
    lsr
    // [15] getValue::return#1 = (unsigned int)getValue::$2 -- vwuz1=_word_vbuaa 
    sta.z return
    lda #0
    sta.z return+1
    jmp __breturn
    // getValue::@return
  __breturn:
    // [16] return 
    rts
}
  // File Data
.segment Data
  arr16: .fill 2*$80, 0

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __b2
Removing instruction jmp __breturn
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label __b1_from___b2 with __b1
Removing instruction __b1_from___b2:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __b1_from_main:
Removing instruction __b2:
Removing instruction __breturn:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Removing instruction jmp __b1
Succesful ASM optimization Pass5NextJumpElimination

FINAL SYMBOL TABLE
__constant unsigned int arr16[$80] = { fill( $80, 0) }
unsigned int getValue(unsigned int index)
char getValue::$0 // reg byte a 202.0
char getValue::$1 // reg byte a 202.0
char getValue::$2 // reg byte a 101.0
char getValue::$3 // reg byte a 202.0
unsigned int getValue::index
unsigned int getValue::index#0 // index zp[2]:2 112.0
unsigned int getValue::return
unsigned int getValue::return#0 // return zp[2]:4 22.0
unsigned int getValue::return#1 // return zp[2]:4 37.33333333333333
void main()
unsigned int main::$0 // zp[2]:4 11.0
char main::$2 // reg byte a 22.0
__constant unsigned int *main::SCREEN = (unsigned int *) 1024
char main::idx
char main::idx#1 // reg byte x 16.5
char main::idx#2 // reg byte x 6.285714285714286

reg byte x [ main::idx#2 main::idx#1 ]
zp[2]:2 [ getValue::index#0 ]
zp[2]:4 [ getValue::return#0 main::$0 getValue::return#1 ]
reg byte a [ main::$2 ]
reg byte a [ getValue::$0 ]
reg byte a [ getValue::$3 ]
reg byte a [ getValue::$1 ]
reg byte a [ getValue::$2 ]


FINAL ASSEMBLER
Score: 502

  // File Comments
// Test KickC performance for 16-bit array lookup function from article "Optimizing C array lookups for the 6502"
// http://8bitworkshop.com/blog/compilers/2019/03/17/cc65-optimization.html
  // Upstart
  // Commodore 64 PRG executable file
.file [name="array-16bit-lookup.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
.segment Code
  // main
main: {
    .label SCREEN = $400
    .label __0 = 4
    // [1] phi from main to main::@1 [phi:main->main::@1]
    // [1] phi main::idx#2 = 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
    ldx #0
    // [1] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
    // [1] phi main::idx#2 = main::idx#1 [phi:main::@2->main::@1#0] -- register_copy 
    // main::@1
  __b1:
    // getValue(idx)
    // [2] getValue::index#0 = main::idx#2 -- vwuz1=vbuxx 
    txa
    sta.z getValue.index
    lda #0
    sta.z getValue.index+1
    // [3] call getValue
    jsr getValue
    // [4] getValue::return#0 = getValue::return#1
    // main::@2
    // [5] main::$0 = getValue::return#0
    // SCREEN[idx] = getValue(idx)
    // [6] main::$2 = main::idx#2 << 1 -- vbuaa=vbuxx_rol_1 
    txa
    asl
    // [7] main::SCREEN[main::$2] = main::$0 -- pwuc1_derefidx_vbuaa=vwuz1 
    tay
    lda.z __0
    sta SCREEN,y
    lda.z __0+1
    sta SCREEN+1,y
    // for(unsigned char idx : 0..128)
    // [8] main::idx#1 = ++ main::idx#2 -- vbuxx=_inc_vbuxx 
    inx
    // [9] if(main::idx#1!=$81) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #$81
    bne __b1
    // main::@return
    // }
    // [10] return 
    rts
}
  // getValue
// __zp(4) unsigned int getValue(__zp(2) unsigned int index)
getValue: {
    .label index = 2
    .label return = 4
    // index & 0x7f
    // [11] getValue::$0 = getValue::index#0 & $7f -- vbuaa=vwuz1_band_vbuc1 
    lda #$7f
    and.z index
    // arr16[index & 0x7f] & 0xff
    // [12] getValue::$3 = getValue::$0 << 1 -- vbuaa=vbuaa_rol_1 
    asl
    // [13] getValue::$1 = arr16[getValue::$3] & $ff -- vbuaa=pwuc1_derefidx_vbuaa_band_vbuc2 
    tay
    lda #$ff
    and arr16,y
    // (arr16[index & 0x7f] & 0xff) >> 1
    // [14] getValue::$2 = getValue::$1 >> 1 -- vbuaa=vbuaa_ror_1 
    lsr
    // return (unsigned int)((arr16[index & 0x7f] & 0xff) >> 1);
    // [15] getValue::return#1 = (unsigned int)getValue::$2 -- vwuz1=_word_vbuaa 
    sta.z return
    lda #0
    sta.z return+1
    // getValue::@return
    // }
    // [16] return 
    rts
}
  // File Data
.segment Data
  arr16: .fill 2*$80, 0

