
CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  main::screen[$28*$a] = 'a'
  to:main::@return
main::@return: scope:[main]  from main
  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
void __start()
void main()
__constant char * const main::screen = (char *)$400

Adding number conversion cast (unumber) $28*$a in main::screen[$28*$a] = 'a'
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant pointer cast (char *) 1024
Successful SSA optimization PassNCastSimplification
De-inlining pointer[w] to *(pointer+w)   [0] main::screen[(unsigned int)$28*$a] = 'a'
Successful SSA optimization Pass2DeInlineWordDerefIdx
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
Constant right-side identified [0] main::$0 = main::screen + (unsigned int)$28*$a
Successful SSA optimization Pass2ConstantRValueConsolidation
Constant main::$0 = main::screen+(unsigned int)$28*$a
Successful SSA optimization Pass2ConstantIdentification
Constant inlined main::$0 = main::screen+(unsigned int)$28*$a
Successful SSA optimization Pass2ConstantInlining
Finalized unsigned number type (char) $28
Finalized unsigned number type (char) $a
Successful SSA optimization PassNFinalizeNumberTypeConversions
CALL GRAPH

Created 0 initial phi equivalence classes
Coalesced down to 0 phi equivalence classes

FINAL CONTROL FLOW GRAPH

void main()
main: scope:[main]  from
  [0] *(main::screen+(unsigned int)$28*$a) = 'a'
  to:main::@return
main::@return: scope:[main]  from main
  [1] return 
  to:@return


VARIABLE REGISTER WEIGHTS
void main()

Initial phi equivalence classes
Complete equivalence classes
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [0] *(main::screen+(unsigned int)$28*$a) = 'a' [ ] (  [ ] { }  ) always clobbers reg byte a 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 
Uplift Scope [] 

Uplifting [main] best 15 combination 
Uplifting [] best 15 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Tests that array-indexing by a constant word is turned into a constant pointer
  // Upstart
  // Commodore 64 PRG executable file
.file [name="derefidx-word-1.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
    // [0] *(main::screen+(unsigned int)$28*$a) = 'a' -- _deref_pbuc1=vbuc2 
    lda #'a'
    sta screen+$28*$a
    jmp __breturn
    // main::@return
  __breturn:
    // [1] return 
    rts
}
  // File Data

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

FINAL SYMBOL TABLE
void main()
__constant char * const main::screen = (char *) 1024



FINAL ASSEMBLER
Score: 12

  // File Comments
// Tests that array-indexing by a constant word is turned into a constant pointer
  // Upstart
  // Commodore 64 PRG executable file
.file [name="derefidx-word-1.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
    // screen[40*10] = 'a'
    // [0] *(main::screen+(unsigned int)$28*$a) = 'a' -- _deref_pbuc1=vbuc2 
    lda #'a'
    sta screen+$28*$a
    // main::@return
    // }
    // [1] return 
    rts
}
  // File Data

