
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::@1
  main::i#2 = phi( main/main::i#0, main::@1/main::i#1 )
  *cursor = '*'
  cursor = cursor + $29
  main::i#1 = main::i#2 + rangenext(0,$18)
  main::$0 = main::i#1 != rangelast(0,$18)
  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 * const SCREEN = (char *)$400
void __start()
__loadstore char *cursor = SCREEN
void main()
bool main::$0
char main::i
char main::i#0
char main::i#1
char main::i#2

Adding number conversion cast (unumber) $29 in cursor = cursor + $29
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant pointer cast (char *) 1024
Simplifying constant integer cast $29
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) $29
Successful SSA optimization PassNFinalizeNumberTypeConversions
Simple Condition main::$0 [6] if(main::i#1!=rangelast(0,$18)) goto main::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Resolved ranged next value [4] main::i#1 = ++ main::i#2 to ++
Resolved ranged comparison value [6] if(main::i#1!=rangelast(0,$18)) goto main::@1 to $19
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) $19 in [4] if(main::i#1!=$19) goto main::@1
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast $19
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) $19
Successful SSA optimization PassNFinalizeNumberTypeConversions
Inlining constant with var siblings main::i#0
Constant inlined main::i#0 = 0
Successful SSA optimization Pass2ConstantInlining
Added new block during phi lifting main::@2(between main::@1 and main::@1)
Adding NOP phi() at start of main
CALL GRAPH

Created 1 initial phi equivalence classes
Coalesced [7] main::i#3 = main::i#1
Coalesced down to 1 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::i#2 = phi( main/0, main::@1/main::i#1 )
  [2] *cursor = '*'
  [3] cursor = cursor + $29
  [4] main::i#1 = ++ main::i#2
  [5] if(main::i#1!=$19) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@1
  [6] return 
  to:@return


VARIABLE REGISTER WEIGHTS
__loadstore char *cursor = SCREEN // 5.5
void main()
char main::i
char main::i#1 // 16.5
char main::i#2 // 7.333333333333333

Initial phi equivalence classes
[ main::i#2 main::i#1 ]
Added variable cursor to live range equivalence class [ cursor ]
Complete equivalence classes
[ main::i#2 main::i#1 ]
[ cursor ]
Allocated zp[1]:2 [ main::i#2 main::i#1 ]
Allocated mem[2] [ cursor ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [2] *cursor = '*' [ main::i#2 cursor ] (  [ main::i#2 cursor ] { }  ) always clobbers reg byte a reg byte y 
Removing always clobbered register reg byte a as potential for zp[1]:2 [ main::i#2 main::i#1 ]
Removing always clobbered register reg byte y as potential for zp[1]:2 [ main::i#2 main::i#1 ]
Statement [3] cursor = cursor + $29 [ main::i#2 cursor ] (  [ main::i#2 cursor ] { }  ) always clobbers reg byte a 
Statement [2] *cursor = '*' [ main::i#2 cursor ] (  [ main::i#2 cursor ] { }  ) always clobbers reg byte a reg byte y 
Statement [3] cursor = cursor + $29 [ main::i#2 cursor ] (  [ main::i#2 cursor ] { }  ) always clobbers reg byte a 
Potential registers zp[1]:2 [ main::i#2 main::i#1 ] : zp[1]:2 , reg byte x , 
Potential registers mem[2] [ cursor ] : mem[2] , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 23.83: zp[1]:2 [ main::i#2 main::i#1 ] 
Uplift Scope [] 5.5: mem[2] [ cursor ] 

Uplifting [main] best 626 combination reg byte x [ main::i#2 main::i#1 ] 
Uplifting [] best 626 combination mem[2] [ cursor ] 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Test declaring a variable as "memory", meaning it will be stored in memory and accessed through an implicit pointer (using load/store)
// Test a memory variable containing a pointer
  // Upstart
  // Commodore 64 PRG executable file
.file [name="declared-memory-var-2.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
  .label SCREEN = $400
.segment Code
  // 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] -- 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::i#2 = main::i#1 [phi:main::@1->main::@1#0] -- register_copy 
    jmp __b1
    // main::@1
  __b1:
    // [2] *cursor = '*' -- _deref_pbum1=vbuc1 
    lda #'*'
    ldy cursor
    sty.z $fe
    ldy cursor+1
    sty.z $ff
    ldy #0
    sta ($fe),y
    // [3] cursor = cursor + $29 -- pbum1=pbum1_plus_vbuc1 
    lda #$29
    clc
    adc cursor
    sta cursor
    bcc !+
    inc cursor+1
  !:
    // [4] main::i#1 = ++ main::i#2 -- vbuxx=_inc_vbuxx 
    inx
    // [5] if(main::i#1!=$19) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #$19
    bne __b1_from___b1
    jmp __breturn
    // main::@return
  __breturn:
    // [6] return 
    rts
}
  // File Data
.segment Data
  cursor: .word SCREEN

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
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 * const SCREEN = (char *) 1024
__loadstore char *cursor = SCREEN // mem[2] 5.5
void main()
char main::i
char main::i#1 // reg byte x 16.5
char main::i#2 // reg byte x 7.333333333333333

reg byte x [ main::i#2 main::i#1 ]
mem[2] [ cursor ]


FINAL ASSEMBLER
Score: 536

  // File Comments
// Test declaring a variable as "memory", meaning it will be stored in memory and accessed through an implicit pointer (using load/store)
// Test a memory variable containing a pointer
  // Upstart
  // Commodore 64 PRG executable file
.file [name="declared-memory-var-2.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
  .label SCREEN = $400
.segment Code
  // main
main: {
    // [1] phi from main to main::@1 [phi:main->main::@1]
    // [1] phi main::i#2 = 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
    ldx #0
    // [1] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
    // [1] phi main::i#2 = main::i#1 [phi:main::@1->main::@1#0] -- register_copy 
    // main::@1
  __b1:
    // *cursor = '*'
    // [2] *cursor = '*' -- _deref_pbum1=vbuc1 
    lda #'*'
    ldy cursor
    sty.z $fe
    ldy cursor+1
    sty.z $ff
    ldy #0
    sta ($fe),y
    // cursor += 41
    // [3] cursor = cursor + $29 -- pbum1=pbum1_plus_vbuc1 
    lda #$29
    clc
    adc cursor
    sta cursor
    bcc !+
    inc cursor+1
  !:
    // for( char i: 0..24 )
    // [4] main::i#1 = ++ main::i#2 -- vbuxx=_inc_vbuxx 
    inx
    // [5] if(main::i#1!=$19) goto main::@1 -- vbuxx_neq_vbuc1_then_la1 
    cpx #$19
    bne __b1
    // main::@return
    // }
    // [6] return 
    rts
}
  // File Data
.segment Data
  cursor: .word SCREEN

