Setting struct to load/store in variable affected by address-of (struct Point*) main::q ← &(volatile struct Point) main::p

CONTROL FLOW GRAPH SSA

(void()) main()
main: scope:[main]  from _start
  *(&(volatile struct Point) main::p) ← memcpy(*(&(const struct Point) $0), struct Point, (const byte) SIZEOF_STRUCT_POINT)
  (volatile struct Point) main::p ← struct-unwound {*(&(volatile struct Point) main::p)}
  (byte*~) main::$2 ← (byte*)(const struct Point*) main::q
  (byte*~) main::$0 ← (byte*~) main::$2 + (const byte) OFFSET_STRUCT_POINT_X
  *((const nomodify byte*) main::SCREEN + (number) 0) ← *((byte*~) main::$0)
  (byte*~) main::$3 ← (byte*)(const struct Point*) main::q
  (byte*~) main::$1 ← (byte*~) main::$3 + (const byte) OFFSET_STRUCT_POINT_Y
  *((const nomodify byte*) main::SCREEN + (number) 1) ← *((byte*~) main::$1)
  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
(const struct Point) $0 = { x: (byte) 2, y: (byte) 3 }
(const byte) OFFSET_STRUCT_POINT_X = (byte) 0
(const byte) OFFSET_STRUCT_POINT_Y = (byte) 1
(byte) Point::x
(byte) Point::y
(const byte) SIZEOF_STRUCT_POINT = (byte) 2
(void()) _start()
(label) _start::@1
(label) _start::@return
(void()) main()
(byte*~) main::$0
(byte*~) main::$1
(byte*~) main::$2
(byte*~) main::$3
(label) main::@return
(const nomodify byte*) main::SCREEN = (byte*)(number) $400
(volatile struct Point) main::p loadstore
(const struct Point*) main::q = &(volatile struct Point) main::p

Adding number conversion cast (unumber) 0 in *((const nomodify byte*) main::SCREEN + (number) 0) ← *((byte*~) main::$0)
Adding number conversion cast (unumber) 1 in *((const nomodify byte*) main::SCREEN + (number) 1) ← *((byte*~) main::$1)
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast 0
Simplifying constant integer cast 1
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 0
Finalized unsigned number type (byte) 1
Successful SSA optimization PassNFinalizeNumberTypeConversions
Removing C-classic struct-unwound assignment [1] (volatile struct Point) main::p ← struct-unwound {*(&(volatile struct Point) main::p)}
Constant right-side identified [2] (byte*~) main::$2 ← (byte*)(const struct Point*) main::q
Constant right-side identified [5] (byte*~) main::$3 ← (byte*)(const struct Point*) main::q
Successful SSA optimization Pass2ConstantRValueConsolidation
Constant (const byte*) main::$2 = (byte*)main::q
Constant (const byte*) main::$3 = (byte*)main::q
Successful SSA optimization Pass2ConstantIdentification
Converting *(pointer+n) to pointer[n] [4] *((const nomodify byte*) main::SCREEN + (byte) 0) ← *((byte*~) main::$0)  -- *(main::$2 + OFFSET_STRUCT_POINT_X)
Converting *(pointer+n) to pointer[n] [7] *((const nomodify byte*) main::SCREEN + (byte) 1) ← *((byte*~) main::$1)  -- *(main::$3 + OFFSET_STRUCT_POINT_Y)
Successful SSA optimization Pass2InlineDerefIdx
Simplifying expression containing zero main::$2 in [3] (byte*~) main::$0 ← (const byte*) main::$2 + (const byte) OFFSET_STRUCT_POINT_X
Simplifying expression containing zero main::$2 in [4] *((const nomodify byte*) main::SCREEN + (byte) 0) ← *((const byte*) main::$2 + (const byte) OFFSET_STRUCT_POINT_X)
Simplifying expression containing zero main::SCREEN in [4] *((const nomodify byte*) main::SCREEN + (byte) 0) ← *((const byte*) main::$2)
Successful SSA optimization PassNSimplifyExpressionWithZero
Eliminating unused variable (byte*~) main::$0 and assignment [1] (byte*~) main::$0 ← (const byte*) main::$2
Eliminating unused variable (byte*~) main::$1 and assignment [3] (byte*~) main::$1 ← (const byte*) main::$3 + (const byte) OFFSET_STRUCT_POINT_Y
Eliminating unused constant (const byte) 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
Constant inlined main::$2 = (byte*)(const struct Point*) main::q
Constant inlined main::$3 = (byte*)(const struct Point*) main::q
Successful SSA optimization Pass2ConstantInlining
Consolidated array index constant in *((byte*)main::q+OFFSET_STRUCT_POINT_Y)
Consolidated array index constant in *(main::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] *(&(volatile struct Point) main::p) ← memcpy(*(&(const struct Point) $0), struct Point, (const byte) SIZEOF_STRUCT_POINT)
  [1] *((const nomodify byte*) main::SCREEN) ← *((byte*)(const struct Point*) main::q)
  [2] *((const nomodify byte*) main::SCREEN+(byte) 1) ← *((byte*)(const struct Point*) main::q+(const byte) OFFSET_STRUCT_POINT_Y)
  to:main::@return
main::@return: scope:[main]  from main
  [3] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(byte) Point::x
(byte) Point::y
(void()) main()
(volatile struct Point) main::p loadstore

Initial phi equivalence classes
Added variable main::p to live range equivalence class [ main::p ]
Complete equivalence classes
[ main::p ]
Allocated zp[2]:2 [ main::p ]

INITIAL ASM
Target platform is c64basic / MOS6502X
  // File Comments
// Minimal struct -  using address-of
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const SIZEOF_STRUCT_POINT = 2
  .const OFFSET_STRUCT_POINT_Y = 1
  // main
main: {
    .label SCREEN = $400
    .label q = p
    .label p = 2
    // [0] *(&(volatile struct Point) main::p) ← memcpy(*(&(const struct Point) $0), struct Point, (const byte) SIZEOF_STRUCT_POINT) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
    ldy #SIZEOF_STRUCT_POINT
  !:
    lda __0-1,y
    sta p-1,y
    dey
    bne !-
    // [1] *((const nomodify byte*) main::SCREEN) ← *((byte*)(const struct Point*) main::q) -- _deref_pbuc1=_deref_pbuc2 
    lda.z q
    sta SCREEN
    // [2] *((const nomodify byte*) main::SCREEN+(byte) 1) ← *((byte*)(const struct Point*) main::q+(const byte) OFFSET_STRUCT_POINT_Y) -- _deref_pbuc1=_deref_pbuc2 
    lda q+OFFSET_STRUCT_POINT_Y
    sta SCREEN+1
    jmp __breturn
    // main::@return
  __breturn:
    // [3] return 
    rts
}
  // File Data
  __0: .byte 2, 3

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [0] *(&(volatile struct Point) main::p) ← memcpy(*(&(const struct Point) $0), struct Point, (const byte) SIZEOF_STRUCT_POINT) [ ] (  [ ] { }  ) always clobbers reg byte a reg byte y 
Statement [1] *((const nomodify byte*) main::SCREEN) ← *((byte*)(const struct Point*) main::q) [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [2] *((const nomodify byte*) main::SCREEN+(byte) 1) ← *((byte*)(const struct Point*) main::q+(const byte) OFFSET_STRUCT_POINT_Y) [ ] (  [ ] { }  ) always clobbers reg byte a 
Potential registers zp[2]:2 [ main::p ] : zp[2]:2 , 

REGISTER UPLIFT SCOPES
Uplift Scope [Point] 
Uplift Scope [main] 0: zp[2]:2 [ main::p ] 
Uplift Scope [] 

Uplifting [Point] best 40 combination 
Uplifting [main] best 40 combination zp[2]:2 [ main::p ] 
Uplifting [] best 40 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Minimal struct -  using address-of
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const SIZEOF_STRUCT_POINT = 2
  .const OFFSET_STRUCT_POINT_Y = 1
  // main
main: {
    .label SCREEN = $400
    .label q = p
    .label p = 2
    // [0] *(&(volatile struct Point) main::p) ← memcpy(*(&(const struct Point) $0), struct Point, (const byte) SIZEOF_STRUCT_POINT) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
    ldy #SIZEOF_STRUCT_POINT
  !:
    lda __0-1,y
    sta p-1,y
    dey
    bne !-
    // [1] *((const nomodify byte*) main::SCREEN) ← *((byte*)(const struct Point*) main::q) -- _deref_pbuc1=_deref_pbuc2 
    lda.z q
    sta SCREEN
    // [2] *((const nomodify byte*) main::SCREEN+(byte) 1) ← *((byte*)(const struct Point*) main::q+(const byte) OFFSET_STRUCT_POINT_Y) -- _deref_pbuc1=_deref_pbuc2 
    lda q+OFFSET_STRUCT_POINT_Y
    sta SCREEN+1
    jmp __breturn
    // main::@return
  __breturn:
    // [3] return 
    rts
}
  // File Data
  __0: .byte 2, 3

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

FINAL SYMBOL TABLE
(const struct Point) $0 = { x: (byte) 2, y: (byte) 3 }
(const byte) OFFSET_STRUCT_POINT_Y = (byte) 1
(byte) Point::x
(byte) Point::y
(const byte) SIZEOF_STRUCT_POINT = (byte) 2
(void()) main()
(label) main::@return
(const nomodify byte*) main::SCREEN = (byte*) 1024
(volatile struct Point) main::p loadstore zp[2]:2
(const struct Point*) main::q = &(volatile struct Point) main::p

zp[2]:2 [ main::p ]


FINAL ASSEMBLER
Score: 37

  // File Comments
// Minimal struct -  using address-of
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const SIZEOF_STRUCT_POINT = 2
  .const OFFSET_STRUCT_POINT_Y = 1
  // main
main: {
    .label SCREEN = $400
    .label q = p
    .label p = 2
    // p = { 2, 3 }
    // [0] *(&(volatile struct Point) main::p) ← memcpy(*(&(const struct Point) $0), struct Point, (const byte) SIZEOF_STRUCT_POINT) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
    ldy #SIZEOF_STRUCT_POINT
  !:
    lda __0-1,y
    sta p-1,y
    dey
    bne !-
    // SCREEN[0] = q->x
    // [1] *((const nomodify byte*) main::SCREEN) ← *((byte*)(const struct Point*) main::q) -- _deref_pbuc1=_deref_pbuc2 
    lda.z q
    sta SCREEN
    // SCREEN[1] = q->y
    // [2] *((const nomodify byte*) main::SCREEN+(byte) 1) ← *((byte*)(const struct Point*) main::q+(const byte) OFFSET_STRUCT_POINT_Y) -- _deref_pbuc1=_deref_pbuc2 
    lda q+OFFSET_STRUCT_POINT_Y
    sta SCREEN+1
    // main::@return
    // }
    // [3] return 
    rts
}
  // File Data
  __0: .byte 2, 3