kickc/src/test/ref/union-9.log

CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  SCREEN[0] = *((char *)&data+OFFSET_UNION_DATA_B)
  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
__constant char OFFSET_UNION_DATA_B = 0
__constant char * const SCREEN = (char *)$400
void __start()
__loadstore union Data data = { w: $4d2 }
void main()

Adding number conversion cast (unumber) 0 in SCREEN[0] = *((char *)&data+OFFSET_UNION_DATA_B)
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant pointer cast (char *) 1024
Simplifying constant integer cast 0
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) 0
Successful SSA optimization PassNFinalizeNumberTypeConversions
Simplifying expression containing zero (char *)&data in [0] SCREEN[0] = *((char *)&data+OFFSET_UNION_DATA_B)
Simplifying expression containing zero SCREEN in [0] SCREEN[0] = *((char *)&data)
Successful SSA optimization PassNSimplifyExpressionWithZero
Eliminating unused constant OFFSET_UNION_DATA_B
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
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] *SCREEN = *((char *)&data)
  to:main::@return
main::@return: scope:[main]  from main
  [1] return 
  to:@return


VARIABLE REGISTER WEIGHTS
__loadstore union Data data = { w: $4d2 }
void main()

Initial phi equivalence classes
Added variable data to live range equivalence class [ data ]
Complete equivalence classes
[ data ]
Allocated mem[2] [ data ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [0] *SCREEN = *((char *)&data) [ ] (  [ ] { }  ) always clobbers reg byte a 
Potential registers mem[2] [ data ] : mem[2] , 

REGISTER UPLIFT SCOPES
Uplift Scope [Data] 
Uplift Scope [main] 
Uplift Scope [] 0: mem[2] [ data ] 

Uplifting [Data] best 17 combination 
Uplifting [main] best 17 combination 
Uplifting [] best 17 combination mem[2] [ data ] 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Minimal union with C99 style designator initialization behaviour.
  // Upstart
  // Commodore 64 PRG executable file
.file [name="union-9.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: {
    // [0] *SCREEN = *((char *)&data) -- _deref_pbuc1=_deref_pbuc2 
    lda data
    sta SCREEN
    jmp __breturn
    // main::@return
  __breturn:
    // [1] return 
    rts
}
  // File Data
.segment Data
  data: .word $4d2

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

FINAL SYMBOL TABLE
__constant char * const SCREEN = (char *) 1024
__loadstore union Data data = { w: $4d2 } // mem[2]
void main()

mem[2] [ data ]


FINAL ASSEMBLER
Score: 14

  // File Comments
// Minimal union with C99 style designator initialization behaviour.
  // Upstart
  // Commodore 64 PRG executable file
.file [name="union-9.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: {
    // SCREEN[0] = data.b
    // [0] *SCREEN = *((char *)&data) -- _deref_pbuc1=_deref_pbuc2 
    lda data
    sta SCREEN
    // main::@return
    // }
    // [1] return 
    rts
}
  // File Data
.segment Data
  data: .word $4d2