Removing C-classic struct-unwound assignment main::point1 = struct-unwound {*(&main::point1)}
Removing C-classic struct-unwound assignment main::point2 = struct-unwound {*(&main::point2)}

CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  *(&main::point1) = memset(struct Point, SIZEOF_STRUCT_POINT)
  *((char *)&main::point1+OFFSET_STRUCT_POINT_X) = 2
  *((char *)&main::point1+OFFSET_STRUCT_POINT_Y) = 3
  *(&main::point2) = memcpy(*(&main::point1), struct Point, SIZEOF_STRUCT_POINT)
  SCREEN[0] = *((char *)&main::point2+OFFSET_STRUCT_POINT_X)
  SCREEN[1] = *((char *)&main::point2+OFFSET_STRUCT_POINT_Y)
  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_STRUCT_POINT_X = 0
__constant char OFFSET_STRUCT_POINT_Y = 1
__constant char * const SCREEN = (char *)$400
__constant char SIZEOF_STRUCT_POINT = 2
void __start()
void main()
__loadstore struct Point main::point1
__loadstore struct Point main::point2

Adding number conversion cast (unumber) 2 in *((char *)&main::point1+OFFSET_STRUCT_POINT_X) = 2
Adding number conversion cast (unumber) 3 in *((char *)&main::point1+OFFSET_STRUCT_POINT_Y) = 3
Adding number conversion cast (unumber) 0 in SCREEN[0] = *((char *)&main::point2+OFFSET_STRUCT_POINT_X)
Adding number conversion cast (unumber) 1 in SCREEN[1] = *((char *)&main::point2+OFFSET_STRUCT_POINT_Y)
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast *((char *)&main::point1+OFFSET_STRUCT_POINT_X) = (unumber)2
Inlining cast *((char *)&main::point1+OFFSET_STRUCT_POINT_Y) = (unumber)3
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (char *) 1024
Simplifying constant integer cast 2
Simplifying constant integer cast 3
Simplifying constant integer cast 0
Simplifying constant integer cast 1
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) 2
Finalized unsigned number type (char) 3
Finalized unsigned number type (char) 0
Finalized unsigned number type (char) 1
Successful SSA optimization PassNFinalizeNumberTypeConversions
Simplifying expression containing zero (char *)&main::point1 in [1] *((char *)&main::point1+OFFSET_STRUCT_POINT_X) = 2
Simplifying expression containing zero (char *)&main::point2 in [4] SCREEN[0] = *((char *)&main::point2+OFFSET_STRUCT_POINT_X)
Simplifying expression containing zero SCREEN in [4] SCREEN[0] = *((char *)&main::point2)
Successful SSA optimization PassNSimplifyExpressionWithZero
Eliminating unused constant OFFSET_STRUCT_POINT_X
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
Consolidated array index constant in *(SCREEN+1)
Successful SSA optimization Pass2ConstantAdditionElimination
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::point1) = memset(struct Point, SIZEOF_STRUCT_POINT)
  [1] *((char *)&main::point1) = 2
  [2] *((char *)&main::point1+OFFSET_STRUCT_POINT_Y) = 3
  [3] *(&main::point2) = memcpy(*(&main::point1), struct Point, SIZEOF_STRUCT_POINT)
  [4] *SCREEN = *((char *)&main::point2)
  [5] *(SCREEN+1) = *((char *)&main::point2+OFFSET_STRUCT_POINT_Y)
  to:main::@return
main::@return: scope:[main]  from main
  [6] return 
  to:@return


VARIABLE REGISTER WEIGHTS
void main()
__loadstore struct Point main::point1
__loadstore struct Point main::point2

Initial phi equivalence classes
Added variable main::point1 to live range equivalence class [ main::point1 ]
Added variable main::point2 to live range equivalence class [ main::point2 ]
Complete equivalence classes
[ main::point1 ]
[ main::point2 ]
Allocated zp[2]:2 [ main::point1 ]
Allocated zp[2]:4 [ main::point2 ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [0] *(&main::point1) = memset(struct Point, SIZEOF_STRUCT_POINT) [ main::point1 main::point2 ] (  [ main::point1 main::point2 ] { }  ) always clobbers reg byte a reg byte y 
Statement [1] *((char *)&main::point1) = 2 [ main::point1 main::point2 ] (  [ main::point1 main::point2 ] { }  ) always clobbers reg byte a 
Statement [2] *((char *)&main::point1+OFFSET_STRUCT_POINT_Y) = 3 [ main::point1 main::point2 ] (  [ main::point1 main::point2 ] { }  ) always clobbers reg byte a 
Statement [3] *(&main::point2) = memcpy(*(&main::point1), struct Point, SIZEOF_STRUCT_POINT) [ main::point2 ] (  [ main::point2 ] { }  ) always clobbers reg byte a reg byte y 
Statement [4] *SCREEN = *((char *)&main::point2) [ main::point2 ] (  [ main::point2 ] { }  ) always clobbers reg byte a 
Statement [5] *(SCREEN+1) = *((char *)&main::point2+OFFSET_STRUCT_POINT_Y) [ ] (  [ ] { }  ) always clobbers reg byte a 
Potential registers zp[2]:2 [ main::point1 ] : zp[2]:2 , 
Potential registers zp[2]:4 [ main::point2 ] : zp[2]:4 , 

REGISTER UPLIFT SCOPES
Uplift Scope [Point] 
Uplift Scope [main] 0: zp[2]:2 [ main::point1 ] 0: zp[2]:4 [ main::point2 ] 
Uplift Scope [] 

Uplifting [Point] best 64 combination 
Uplifting [main] best 64 combination zp[2]:2 [ main::point1 ] zp[2]:4 [ main::point2 ] 
Uplifting [] best 64 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Minimal struct with C-Standard behavior - copying
  // Upstart
  // Commodore 64 PRG executable file
.file [name="struct-15.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
  .const SIZEOF_STRUCT_POINT = 2
  .const OFFSET_STRUCT_POINT_Y = 1
  .label SCREEN = $400
.segment Code
  // main
main: {
    .label point1 = 2
    .label point2 = 4
    // [0] *(&main::point1) = memset(struct Point, SIZEOF_STRUCT_POINT) -- _deref_pssc1=_memset_vbuc2 
    ldy #SIZEOF_STRUCT_POINT
    lda #0
  !:
    dey
    sta point1,y
    bne !-
    // [1] *((char *)&main::point1) = 2 -- _deref_pbuc1=vbuc2 
    lda #2
    sta.z point1
    // [2] *((char *)&main::point1+OFFSET_STRUCT_POINT_Y) = 3 -- _deref_pbuc1=vbuc2 
    lda #3
    sta point1+OFFSET_STRUCT_POINT_Y
    // [3] *(&main::point2) = memcpy(*(&main::point1), struct Point, SIZEOF_STRUCT_POINT) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
    ldy #SIZEOF_STRUCT_POINT
  !:
    lda point1-1,y
    sta point2-1,y
    dey
    bne !-
    // [4] *SCREEN = *((char *)&main::point2) -- _deref_pbuc1=_deref_pbuc2 
    lda.z point2
    sta SCREEN
    // [5] *(SCREEN+1) = *((char *)&main::point2+OFFSET_STRUCT_POINT_Y) -- _deref_pbuc1=_deref_pbuc2 
    lda point2+OFFSET_STRUCT_POINT_Y
    sta SCREEN+1
    jmp __breturn
    // main::@return
  __breturn:
    // [6] return 
    rts
}
  // File Data

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

FINAL SYMBOL TABLE
__constant char OFFSET_STRUCT_POINT_Y = 1
__constant char * const SCREEN = (char *) 1024
__constant char SIZEOF_STRUCT_POINT = 2
void main()
__loadstore struct Point main::point1 // zp[2]:2
__loadstore struct Point main::point2 // zp[2]:4

zp[2]:2 [ main::point1 ]
zp[2]:4 [ main::point2 ]


FINAL ASSEMBLER
Score: 61

  // File Comments
// Minimal struct with C-Standard behavior - copying
  // Upstart
  // Commodore 64 PRG executable file
.file [name="struct-15.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
  .const SIZEOF_STRUCT_POINT = 2
  .const OFFSET_STRUCT_POINT_Y = 1
  .label SCREEN = $400
.segment Code
  // main
main: {
    .label point1 = 2
    .label point2 = 4
    // __ma struct Point point1
    // [0] *(&main::point1) = memset(struct Point, SIZEOF_STRUCT_POINT) -- _deref_pssc1=_memset_vbuc2 
    ldy #SIZEOF_STRUCT_POINT
    lda #0
  !:
    dey
    sta point1,y
    bne !-
    // point1.x = 2
    // [1] *((char *)&main::point1) = 2 -- _deref_pbuc1=vbuc2 
    lda #2
    sta.z point1
    // point1.y = 3
    // [2] *((char *)&main::point1+OFFSET_STRUCT_POINT_Y) = 3 -- _deref_pbuc1=vbuc2 
    lda #3
    sta point1+OFFSET_STRUCT_POINT_Y
    // __ma struct Point point2 = point1
    // [3] *(&main::point2) = memcpy(*(&main::point1), struct Point, SIZEOF_STRUCT_POINT) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
    ldy #SIZEOF_STRUCT_POINT
  !:
    lda point1-1,y
    sta point2-1,y
    dey
    bne !-
    // SCREEN[0] = point2.x
    // [4] *SCREEN = *((char *)&main::point2) -- _deref_pbuc1=_deref_pbuc2 
    lda.z point2
    sta SCREEN
    // SCREEN[1] = point2.y
    // [5] *(SCREEN+1) = *((char *)&main::point2+OFFSET_STRUCT_POINT_Y) -- _deref_pbuc1=_deref_pbuc2 
    lda point2+OFFSET_STRUCT_POINT_Y
    sta SCREEN+1
    // main::@return
    // }
    // [6] return 
    rts
}
  // File Data

