Culled Empty Block (label) malloc::@1

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  (byte*) SCREEN ← ((byte*)) (number) $400
  to:@1

(void()) main()
main: scope:[main]  from @2
  (byte*) heap_head#13 ← phi( @2/(byte*) heap_head#14 )
  call malloc 
  (void*) malloc::return#0 ← (void*) malloc::return#3
  to:main::@1
main::@1: scope:[main]  from main
  (byte*) heap_head#7 ← phi( main/(byte*) heap_head#5 )
  (void*) malloc::return#4 ← phi( main/(void*) malloc::return#0 )
  (void*~) main::$0 ← (void*) malloc::return#4
  (byte*) heap_head#0 ← (byte*) heap_head#7
  (byte*) main::buf1#0 ← ((byte*)) (void*~) main::$0
  call malloc 
  (void*) malloc::return#1 ← (void*) malloc::return#3
  to:main::@2
main::@2: scope:[main]  from main::@1
  (byte*) main::buf1#1 ← phi( main::@1/(byte*) main::buf1#0 )
  (byte*) heap_head#8 ← phi( main::@1/(byte*) heap_head#5 )
  (void*) malloc::return#5 ← phi( main::@1/(void*) malloc::return#1 )
  (void*~) main::$1 ← (void*) malloc::return#5
  (byte*) heap_head#1 ← (byte*) heap_head#8
  (byte*) main::buf2#0 ← ((byte*)) (void*~) main::$1
  *((byte*) main::buf1#1) ← (byte) 'a'
  *((byte*) main::buf2#0) ← (byte) 'b'
  *((byte*) SCREEN + (number) 0) ← *((byte*) main::buf1#1)
  *((byte*) SCREEN + (number) 1) ← *((byte*) main::buf2#0)
  to:main::@return
main::@return: scope:[main]  from main::@2
  (byte*) heap_head#9 ← phi( main::@2/(byte*) heap_head#1 )
  (byte*) heap_head#2 ← (byte*) heap_head#9
  return 
  to:@return
@1: scope:[]  from @begin
  (byte*) heap_head#3 ← ((byte*)) (number) $c000
  to:@2

(void*()) malloc()
malloc: scope:[malloc]  from main main::@1
  (byte*) heap_head#10 ← phi( main/(byte*) heap_head#13 main::@1/(byte*) heap_head#0 )
  (byte*) heap_head#4 ← ++ (byte*) heap_head#10
  (void*) malloc::return#2 ← ((void*)) (byte*) heap_head#4
  to:malloc::@return
malloc::@return: scope:[malloc]  from malloc
  (byte*) heap_head#11 ← phi( malloc/(byte*) heap_head#4 )
  (void*) malloc::return#6 ← phi( malloc/(void*) malloc::return#2 )
  (void*) malloc::return#3 ← (void*) malloc::return#6
  (byte*) heap_head#5 ← (byte*) heap_head#11
  return 
  to:@return
@2: scope:[]  from @1
  (byte*) heap_head#14 ← phi( @1/(byte*) heap_head#3 )
  call main 
  to:@3
@3: scope:[]  from @2
  (byte*) heap_head#12 ← phi( @2/(byte*) heap_head#2 )
  (byte*) heap_head#6 ← (byte*) heap_head#12
  to:@end
@end: scope:[]  from @3

SYMBOL TABLE SSA
(label) @1
(label) @2
(label) @3
(label) @begin
(label) @end
(byte*) SCREEN
(byte*) heap_head
(byte*) heap_head#0
(byte*) heap_head#1
(byte*) heap_head#10
(byte*) heap_head#11
(byte*) heap_head#12
(byte*) heap_head#13
(byte*) heap_head#14
(byte*) heap_head#2
(byte*) heap_head#3
(byte*) heap_head#4
(byte*) heap_head#5
(byte*) heap_head#6
(byte*) heap_head#7
(byte*) heap_head#8
(byte*) heap_head#9
(void()) main()
(void*~) main::$0
(void*~) main::$1
(label) main::@1
(label) main::@2
(label) main::@return
(byte*) main::buf1
(byte*) main::buf1#0
(byte*) main::buf1#1
(byte*) main::buf2
(byte*) main::buf2#0
(void*()) malloc()
(label) malloc::@return
(void*) malloc::return
(void*) malloc::return#0
(void*) malloc::return#1
(void*) malloc::return#2
(void*) malloc::return#3
(void*) malloc::return#4
(void*) malloc::return#5
(void*) malloc::return#6

Adding number conversion cast (unumber) 0 in *((byte*) SCREEN + (number) 0) ← *((byte*) main::buf1#1)
Adding number conversion cast (unumber) 1 in *((byte*) SCREEN + (number) 1) ← *((byte*) main::buf2#0)
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast (byte*) SCREEN ← (byte*)(number) $400
Inlining cast (byte*) main::buf1#0 ← (byte*)(void*~) main::$0
Inlining cast (byte*) main::buf2#0 ← (byte*)(void*~) main::$1
Inlining cast (byte*) heap_head#3 ← (byte*)(number) $c000
Inlining cast (void*) malloc::return#2 ← (void*)(byte*) heap_head#4
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast 0
Simplifying constant integer cast 1
Simplifying constant pointer cast (byte*) 49152
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 0
Finalized unsigned number type (byte) 1
Successful SSA optimization PassNFinalizeNumberTypeConversions
Alias (void*) malloc::return#0 = (void*) malloc::return#4 
Alias (byte*) heap_head#0 = (byte*) heap_head#7 
Alias (void*) malloc::return#1 = (void*) malloc::return#5 
Alias (byte*) main::buf1#0 = (byte*) main::buf1#1 
Alias (byte*) heap_head#1 = (byte*) heap_head#8 (byte*) heap_head#9 (byte*) heap_head#2 
Alias (void*) malloc::return#2 = (void*) malloc::return#6 (void*) malloc::return#3 
Alias (byte*) heap_head#11 = (byte*) heap_head#4 (byte*) heap_head#5 
Alias (byte*) heap_head#14 = (byte*) heap_head#3 
Alias (byte*) heap_head#12 = (byte*) heap_head#6 
Successful SSA optimization Pass2AliasElimination
Identical Phi Values (byte*) heap_head#13 (byte*) heap_head#14
Identical Phi Values (byte*) heap_head#0 (byte*) heap_head#11
Identical Phi Values (byte*) heap_head#1 (byte*) heap_head#11
Identical Phi Values (byte*) heap_head#12 (byte*) heap_head#1
Successful SSA optimization Pass2IdenticalPhiElimination
Constant (const byte*) SCREEN = (byte*) 1024
Constant (const byte*) heap_head#14 = (byte*) 49152
Successful SSA optimization Pass2ConstantIdentification
Simplifying expression containing zero SCREEN in [16] *((const byte*) SCREEN + (byte) 0) ← *((byte*) main::buf1#0)
Successful SSA optimization PassNSimplifyExpressionWithZero
Inlining Noop Cast [3] (byte*) main::buf1#0 ← (byte*)(void*~) main::$0 keeping main::buf1#0
Inlining Noop Cast [7] (byte*) main::buf2#0 ← (byte*)(void*~) main::$1 keeping main::buf2#0
Successful SSA optimization Pass2NopCastInlining
Inlining constant with var siblings (const byte*) heap_head#14
Constant inlined heap_head#14 = (byte*) 49152
Successful SSA optimization Pass2ConstantInlining
Consolidated array index constant in *(SCREEN+1)
Successful SSA optimization Pass2ConstantAdditionElimination
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @2
Adding NOP phi() at start of @3
Adding NOP phi() at start of @end
Adding NOP phi() at start of main
CALL GRAPH
Calls in [] to main:3 
Calls in [main] to malloc:7 malloc:11 

Created 1 initial phi equivalence classes
Coalesced [10] heap_head#15 ← heap_head#11
Coalesced down to 1 phi equivalence classes
Culled Empty Block (label) @1
Culled Empty Block (label) @3
Renumbering block @2 to @1
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @end
Adding NOP phi() at start of main

FINAL CONTROL FLOW GRAPH
@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()

(void()) main()
main: scope:[main]  from @1
  [4] phi()
  [5] call malloc 
  [6] (void*) malloc::return#0 ← (void*) malloc::return#2
  to:main::@1
main::@1: scope:[main]  from main
  [7] (void*) main::buf1#0 ← (void*) malloc::return#0
  [8] call malloc 
  [9] (void*) malloc::return#1 ← (void*) malloc::return#2
  to:main::@2
main::@2: scope:[main]  from main::@1
  [10] (void*) main::buf2#0 ← (void*) malloc::return#1
  [11] *((byte*)(void*) main::buf1#0) ← (byte) 'a'
  [12] *((byte*)(void*) main::buf2#0) ← (byte) 'b'
  [13] *((const byte*) SCREEN) ← *((byte*)(void*) main::buf1#0)
  [14] *((const byte*) SCREEN+(byte) 1) ← *((byte*)(void*) main::buf2#0)
  to:main::@return
main::@return: scope:[main]  from main::@2
  [15] return 
  to:@return

(void*()) malloc()
malloc: scope:[malloc]  from main main::@1
  [16] (byte*) heap_head#10 ← phi( main/(byte*) 49152 main::@1/(byte*) heap_head#11 )
  [17] (byte*) heap_head#11 ← ++ (byte*) heap_head#10
  [18] (void*) malloc::return#2 ← (void*)(byte*) heap_head#11
  to:malloc::@return
malloc::@return: scope:[malloc]  from malloc
  [19] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(byte*) heap_head
(byte*) heap_head#10 4.0
(byte*) heap_head#11 0.6666666666666666
(void()) main()
(byte*) main::buf1
(void*) main::buf1#0 0.3333333333333333
(byte*) main::buf2
(void*) main::buf2#0 0.5
(void*()) malloc()
(void*) malloc::return
(void*) malloc::return#0 4.0
(void*) malloc::return#1 4.0
(void*) malloc::return#2 1.5

Initial phi equivalence classes
[ heap_head#10 heap_head#11 ]
Added variable malloc::return#0 to zero page equivalence class [ malloc::return#0 ]
Added variable main::buf1#0 to zero page equivalence class [ main::buf1#0 ]
Added variable malloc::return#1 to zero page equivalence class [ malloc::return#1 ]
Added variable main::buf2#0 to zero page equivalence class [ main::buf2#0 ]
Added variable malloc::return#2 to zero page equivalence class [ malloc::return#2 ]
Complete equivalence classes
[ heap_head#10 heap_head#11 ]
[ malloc::return#0 ]
[ main::buf1#0 ]
[ malloc::return#1 ]
[ main::buf2#0 ]
[ malloc::return#2 ]
Allocated zp ZP_WORD:2 [ heap_head#10 heap_head#11 ]
Allocated zp ZP_WORD:4 [ malloc::return#0 ]
Allocated zp ZP_WORD:6 [ main::buf1#0 ]
Allocated zp ZP_WORD:8 [ malloc::return#1 ]
Allocated zp ZP_WORD:10 [ main::buf2#0 ]
Allocated zp ZP_WORD:12 [ malloc::return#2 ]

INITIAL ASM
Target platform is c64basic / MOS6502X
  // File Comments
// Test void pointer - issues when assigning returns from malloc()
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  .label heap_head = 2
  // @begin
bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
  // @1
b1:
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
main_from_b1:
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
  // @end
bend:
  // main
main: {
    .label buf1 = 6
    .label buf2 = $a
    // [5] call malloc 
    // [16] phi from main to malloc [phi:main->malloc]
  malloc_from_main:
    // [16] phi (byte*) heap_head#10 = (byte*) 49152 [phi:main->malloc#0] -- pbuz1=pbuc1 
    lda #<$c000
    sta.z heap_head
    lda #>$c000
    sta.z heap_head+1
    jsr malloc
    // [6] (void*) malloc::return#0 ← (void*) malloc::return#2 -- pvoz1=pvoz2 
    lda.z malloc.return_2
    sta.z malloc.return
    lda.z malloc.return_2+1
    sta.z malloc.return+1
    jmp b1
    // main::@1
  b1:
    // [7] (void*) main::buf1#0 ← (void*) malloc::return#0 -- pvoz1=pvoz2 
    lda.z malloc.return
    sta.z buf1
    lda.z malloc.return+1
    sta.z buf1+1
    // [8] call malloc 
    // [16] phi from main::@1 to malloc [phi:main::@1->malloc]
  malloc_from_b1:
    // [16] phi (byte*) heap_head#10 = (byte*) heap_head#11 [phi:main::@1->malloc#0] -- register_copy 
    jsr malloc
    // [9] (void*) malloc::return#1 ← (void*) malloc::return#2 -- pvoz1=pvoz2 
    lda.z malloc.return_2
    sta.z malloc.return_1
    lda.z malloc.return_2+1
    sta.z malloc.return_1+1
    jmp b2
    // main::@2
  b2:
    // [10] (void*) main::buf2#0 ← (void*) malloc::return#1 -- pvoz1=pvoz2 
    lda.z malloc.return_1
    sta.z buf2
    lda.z malloc.return_1+1
    sta.z buf2+1
    // [11] *((byte*)(void*) main::buf1#0) ← (byte) 'a' -- _deref_pbuz1=vbuc1 
    lda #'a'
    ldy #0
    sta (buf1),y
    // [12] *((byte*)(void*) main::buf2#0) ← (byte) 'b' -- _deref_pbuz1=vbuc1 
    lda #'b'
    ldy #0
    sta (buf2),y
    // [13] *((const byte*) SCREEN) ← *((byte*)(void*) main::buf1#0) -- _deref_pbuc1=_deref_pbuz1 
    ldy #0
    lda (buf1),y
    sta SCREEN
    // [14] *((const byte*) SCREEN+(byte) 1) ← *((byte*)(void*) main::buf2#0) -- _deref_pbuc1=_deref_pbuz1 
    ldy #0
    lda (buf2),y
    sta SCREEN+1
    jmp breturn
    // main::@return
  breturn:
    // [15] return 
    rts
}
  // malloc
malloc: {
    .label return = 4
    .label return_1 = 8
    .label return_2 = $c
    // [17] (byte*) heap_head#11 ← ++ (byte*) heap_head#10 -- pbuz1=_inc_pbuz1 
    inc.z heap_head
    bne !+
    inc.z heap_head+1
  !:
    // [18] (void*) malloc::return#2 ← (void*)(byte*) heap_head#11 -- pvoz1=pvoz2 
    lda.z heap_head
    sta.z return_2
    lda.z heap_head+1
    sta.z return_2+1
    jmp breturn
    // malloc::@return
  breturn:
    // [19] return 
    rts
}
  // File Data

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [6] (void*) malloc::return#0 ← (void*) malloc::return#2 [ malloc::return#0 heap_head#11 ] ( main:2 [ malloc::return#0 heap_head#11 ] ) always clobbers reg byte a 
Statement [7] (void*) main::buf1#0 ← (void*) malloc::return#0 [ main::buf1#0 heap_head#11 ] ( main:2 [ main::buf1#0 heap_head#11 ] ) always clobbers reg byte a 
Statement [9] (void*) malloc::return#1 ← (void*) malloc::return#2 [ main::buf1#0 malloc::return#1 ] ( main:2 [ main::buf1#0 malloc::return#1 ] ) always clobbers reg byte a 
Statement [10] (void*) main::buf2#0 ← (void*) malloc::return#1 [ main::buf1#0 main::buf2#0 ] ( main:2 [ main::buf1#0 main::buf2#0 ] ) always clobbers reg byte a 
Statement [11] *((byte*)(void*) main::buf1#0) ← (byte) 'a' [ main::buf1#0 main::buf2#0 ] ( main:2 [ main::buf1#0 main::buf2#0 ] ) always clobbers reg byte a reg byte y 
Statement [12] *((byte*)(void*) main::buf2#0) ← (byte) 'b' [ main::buf1#0 main::buf2#0 ] ( main:2 [ main::buf1#0 main::buf2#0 ] ) always clobbers reg byte a reg byte y 
Statement [13] *((const byte*) SCREEN) ← *((byte*)(void*) main::buf1#0) [ main::buf2#0 ] ( main:2 [ main::buf2#0 ] ) always clobbers reg byte a reg byte y 
Statement [14] *((const byte*) SCREEN+(byte) 1) ← *((byte*)(void*) main::buf2#0) [ ] ( main:2 [ ] ) always clobbers reg byte a reg byte y 
Statement [18] (void*) malloc::return#2 ← (void*)(byte*) heap_head#11 [ malloc::return#2 heap_head#11 ] ( main:2::malloc:5 [ malloc::return#2 heap_head#11 ] main:2::malloc:8 [ main::buf1#0 malloc::return#2 heap_head#11 ] ) always clobbers reg byte a 
Potential registers zp ZP_WORD:2 [ heap_head#10 heap_head#11 ] : zp ZP_WORD:2 , 
Potential registers zp ZP_WORD:4 [ malloc::return#0 ] : zp ZP_WORD:4 , 
Potential registers zp ZP_WORD:6 [ main::buf1#0 ] : zp ZP_WORD:6 , 
Potential registers zp ZP_WORD:8 [ malloc::return#1 ] : zp ZP_WORD:8 , 
Potential registers zp ZP_WORD:10 [ main::buf2#0 ] : zp ZP_WORD:10 , 
Potential registers zp ZP_WORD:12 [ malloc::return#2 ] : zp ZP_WORD:12 , 

REGISTER UPLIFT SCOPES
Uplift Scope [malloc] 4: zp ZP_WORD:4 [ malloc::return#0 ] 4: zp ZP_WORD:8 [ malloc::return#1 ] 1.5: zp ZP_WORD:12 [ malloc::return#2 ] 
Uplift Scope [] 4.67: zp ZP_WORD:2 [ heap_head#10 heap_head#11 ] 
Uplift Scope [main] 0.5: zp ZP_WORD:10 [ main::buf2#0 ] 0.33: zp ZP_WORD:6 [ main::buf1#0 ] 

Uplifting [malloc] best 172 combination zp ZP_WORD:4 [ malloc::return#0 ] zp ZP_WORD:8 [ malloc::return#1 ] zp ZP_WORD:12 [ malloc::return#2 ] 
Uplifting [] best 172 combination zp ZP_WORD:2 [ heap_head#10 heap_head#11 ] 
Uplifting [main] best 172 combination zp ZP_WORD:10 [ main::buf2#0 ] zp ZP_WORD:6 [ main::buf1#0 ] 
Coalescing zero page register [ zp ZP_WORD:4 [ malloc::return#0 ] ] with [ zp ZP_WORD:6 [ main::buf1#0 ] ] - score: 1
Coalescing zero page register [ zp ZP_WORD:8 [ malloc::return#1 ] ] with [ zp ZP_WORD:10 [ main::buf2#0 ] ] - score: 1
Coalescing zero page register [ zp ZP_WORD:8 [ malloc::return#1 main::buf2#0 ] ] with [ zp ZP_WORD:12 [ malloc::return#2 ] ] - score: 1
Allocated (was zp ZP_WORD:8) zp ZP_WORD:6 [ malloc::return#1 main::buf2#0 malloc::return#2 ]

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Test void pointer - issues when assigning returns from malloc()
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  .label heap_head = 2
  // @begin
bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
  // @1
b1:
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
main_from_b1:
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
  // @end
bend:
  // main
main: {
    .label buf1 = 4
    .label buf2 = 6
    // [5] call malloc 
    // [16] phi from main to malloc [phi:main->malloc]
  malloc_from_main:
    // [16] phi (byte*) heap_head#10 = (byte*) 49152 [phi:main->malloc#0] -- pbuz1=pbuc1 
    lda #<$c000
    sta.z heap_head
    lda #>$c000
    sta.z heap_head+1
    jsr malloc
    // [6] (void*) malloc::return#0 ← (void*) malloc::return#2 -- pvoz1=pvoz2 
    lda.z malloc.return_2
    sta.z malloc.return
    lda.z malloc.return_2+1
    sta.z malloc.return+1
    jmp b1
    // main::@1
  b1:
    // [7] (void*) main::buf1#0 ← (void*) malloc::return#0
    // [8] call malloc 
    // [16] phi from main::@1 to malloc [phi:main::@1->malloc]
  malloc_from_b1:
    // [16] phi (byte*) heap_head#10 = (byte*) heap_head#11 [phi:main::@1->malloc#0] -- register_copy 
    jsr malloc
    // [9] (void*) malloc::return#1 ← (void*) malloc::return#2
    jmp b2
    // main::@2
  b2:
    // [10] (void*) main::buf2#0 ← (void*) malloc::return#1
    // [11] *((byte*)(void*) main::buf1#0) ← (byte) 'a' -- _deref_pbuz1=vbuc1 
    lda #'a'
    ldy #0
    sta (buf1),y
    // [12] *((byte*)(void*) main::buf2#0) ← (byte) 'b' -- _deref_pbuz1=vbuc1 
    lda #'b'
    ldy #0
    sta (buf2),y
    // [13] *((const byte*) SCREEN) ← *((byte*)(void*) main::buf1#0) -- _deref_pbuc1=_deref_pbuz1 
    ldy #0
    lda (buf1),y
    sta SCREEN
    // [14] *((const byte*) SCREEN+(byte) 1) ← *((byte*)(void*) main::buf2#0) -- _deref_pbuc1=_deref_pbuz1 
    ldy #0
    lda (buf2),y
    sta SCREEN+1
    jmp breturn
    // main::@return
  breturn:
    // [15] return 
    rts
}
  // malloc
malloc: {
    .label return = 4
    .label return_1 = 6
    .label return_2 = 6
    // [17] (byte*) heap_head#11 ← ++ (byte*) heap_head#10 -- pbuz1=_inc_pbuz1 
    inc.z heap_head
    bne !+
    inc.z heap_head+1
  !:
    // [18] (void*) malloc::return#2 ← (void*)(byte*) heap_head#11 -- pvoz1=pvoz2 
    lda.z heap_head
    sta.z return_2
    lda.z heap_head+1
    sta.z return_2+1
    jmp breturn
    // malloc::@return
  breturn:
    // [19] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp b1
Removing instruction jmp bend
Removing instruction jmp b1
Removing instruction jmp b2
Removing instruction jmp breturn
Removing instruction jmp breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction ldy #0
Removing instruction ldy #0
Removing instruction ldy #0
Succesful ASM optimization Pass5UnnecesaryLoadElimination
Removing instruction b1_from_bbegin:
Removing instruction b1:
Removing instruction main_from_b1:
Removing instruction bend_from_b1:
Removing instruction malloc_from_b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction bend:
Removing instruction malloc_from_main:
Removing instruction b1:
Removing instruction b2:
Removing instruction breturn:
Removing instruction breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Updating BasicUpstart to call main directly
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Removing instruction bbegin:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(const byte*) SCREEN SCREEN = (byte*) 1024
(byte*) heap_head
(byte*) heap_head#10 heap_head zp ZP_WORD:2 4.0
(byte*) heap_head#11 heap_head zp ZP_WORD:2 0.6666666666666666
(void()) main()
(label) main::@1
(label) main::@2
(label) main::@return
(byte*) main::buf1
(void*) main::buf1#0 buf1 zp ZP_WORD:4 0.3333333333333333
(byte*) main::buf2
(void*) main::buf2#0 buf2 zp ZP_WORD:6 0.5
(void*()) malloc()
(label) malloc::@return
(void*) malloc::return
(void*) malloc::return#0 return zp ZP_WORD:4 4.0
(void*) malloc::return#1 return#1 zp ZP_WORD:6 4.0
(void*) malloc::return#2 return#2 zp ZP_WORD:6 1.5

zp ZP_WORD:2 [ heap_head#10 heap_head#11 ]
zp ZP_WORD:4 [ malloc::return#0 main::buf1#0 ]
zp ZP_WORD:6 [ malloc::return#1 main::buf2#0 malloc::return#2 ]


FINAL ASSEMBLER
Score: 106

  // File Comments
// Test void pointer - issues when assigning returns from malloc()
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  .label heap_head = 2
  // @begin
  // [1] phi from @begin to @1 [phi:@begin->@1]
  // @1
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
  // [3] phi from @1 to @end [phi:@1->@end]
  // @end
  // main
main: {
    .label buf1 = 4
    .label buf2 = 6
    // malloc()
    // [5] call malloc 
    // [16] phi from main to malloc [phi:main->malloc]
    // [16] phi (byte*) heap_head#10 = (byte*) 49152 [phi:main->malloc#0] -- pbuz1=pbuc1 
    lda #<$c000
    sta.z heap_head
    lda #>$c000
    sta.z heap_head+1
    jsr malloc
    // malloc()
    // [6] (void*) malloc::return#0 ← (void*) malloc::return#2 -- pvoz1=pvoz2 
    lda.z malloc.return_2
    sta.z malloc.return
    lda.z malloc.return_2+1
    sta.z malloc.return+1
    // main::@1
    // [7] (void*) main::buf1#0 ← (void*) malloc::return#0
    // [8] call malloc 
    // [16] phi from main::@1 to malloc [phi:main::@1->malloc]
    // [16] phi (byte*) heap_head#10 = (byte*) heap_head#11 [phi:main::@1->malloc#0] -- register_copy 
    jsr malloc
    // malloc()
    // [9] (void*) malloc::return#1 ← (void*) malloc::return#2
    // main::@2
    // [10] (void*) main::buf2#0 ← (void*) malloc::return#1
    // *buf1 = 'a'
    // [11] *((byte*)(void*) main::buf1#0) ← (byte) 'a' -- _deref_pbuz1=vbuc1 
    lda #'a'
    ldy #0
    sta (buf1),y
    // *buf2 = 'b'
    // [12] *((byte*)(void*) main::buf2#0) ← (byte) 'b' -- _deref_pbuz1=vbuc1 
    lda #'b'
    sta (buf2),y
    // SCREEN[0] = *buf1
    // [13] *((const byte*) SCREEN) ← *((byte*)(void*) main::buf1#0) -- _deref_pbuc1=_deref_pbuz1 
    lda (buf1),y
    sta SCREEN
    // SCREEN[1] = *buf2
    // [14] *((const byte*) SCREEN+(byte) 1) ← *((byte*)(void*) main::buf2#0) -- _deref_pbuc1=_deref_pbuz1 
    lda (buf2),y
    sta SCREEN+1
    // main::@return
    // }
    // [15] return 
    rts
}
  // malloc
malloc: {
    .label return = 4
    .label return_1 = 6
    .label return_2 = 6
    // heap_head++;
    // [17] (byte*) heap_head#11 ← ++ (byte*) heap_head#10 -- pbuz1=_inc_pbuz1 
    inc.z heap_head
    bne !+
    inc.z heap_head+1
  !:
    // return heap_head;
    // [18] (void*) malloc::return#2 ← (void*)(byte*) heap_head#11 -- pvoz1=pvoz2 
    lda.z heap_head
    sta.z return_2
    lda.z heap_head+1
    sta.z return_2+1
    // malloc::@return
    // }
    // [19] return 
    rts
}
  // File Data