Setting inferred volatile on symbol affected by address-of (byte**~) main::$0 ← & (byte*) main::screen

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  to:@1
main: scope:[main]  from @1
  (byte*) main::screen#0 ← ((byte*)) (number) $400
  (byte**~) main::$0 ← & (byte*) main::screen#0
  (byte**) main::pscreen#0 ← (byte**~) main::$0
  *(*((byte**) main::pscreen#0)) ← (byte) 'a'
  *((byte**) main::pscreen#0) ← ++ *((byte**) main::pscreen#0)
  *(*((byte**) main::pscreen#0)) ← (byte) 'b'
  to:main::@return
main::@return: scope:[main]  from main
  return 
  to:@return
@1: scope:[]  from @begin
  call main 
  to:@2
@2: scope:[]  from @1
  to:@end
@end: scope:[]  from @2

SYMBOL TABLE SSA
(label) @1
(label) @2
(label) @begin
(label) @end
(void()) main()
(byte**~) main::$0
(label) main::@return
(byte**) main::pscreen
(byte**) main::pscreen#0
(byte*) main::screen
(byte*) main::screen#0

Inlining cast (byte*) main::screen#0 ← (byte*)(number) $400
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (byte*) 1024
Successful SSA optimization PassNCastSimplification
Alias (byte**) main::pscreen#0 = (byte**~) main::$0 
Successful SSA optimization Pass2AliasElimination
Constant right-side identified [1] (byte**) main::pscreen#0 ← & (byte*) main::screen#0
Successful SSA optimization Pass2ConstantRValueConsolidation
Constant (const byte**) main::pscreen#0 = &main::screen#0
Successful SSA optimization Pass2ConstantIdentification
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 @end
CALL GRAPH
Calls in [] to main:2 

Created 0 initial phi equivalence classes
Coalesced down to 0 phi equivalence classes
Culled Empty Block (label) @2
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @end

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()
main: scope:[main]  from @1
  [4] (byte*) main::screen#0 ← (byte*) 1024
  [5] *(*((const byte**) main::pscreen#0)) ← (byte) 'a'
  [6] *((const byte**) main::pscreen#0) ← ++ *((const byte**) main::pscreen#0)
  [7] *(*((const byte**) main::pscreen#0)) ← (byte) 'b'
  to:main::@return
main::@return: scope:[main]  from main
  [8] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(void()) main()
(byte**) main::pscreen
(byte*) main::screen
(byte*) main::screen#0 20.0

Initial phi equivalence classes
Complete equivalence classes
[ main::screen#0 ]
Allocated zp ZP_WORD:2 [ main::screen#0 ]

INITIAL ASM
  // File Comments
// Tests optimization of constant pointers to pointers
  // Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  // @begin
bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
  // @1
b1:
  // [2] call main 
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
  // @end
bend:
  // main
main: {
    .label pscreen = screen
    .label screen = 2
    // [4] (byte*) main::screen#0 ← (byte*) 1024 -- pbuz1=pbuc1 
    lda #<$400
    sta screen
    lda #>$400
    sta screen+1
    // [5] *(*((const byte**) main::pscreen#0)) ← (byte) 'a' -- _deref__deref_pptc1=vbuc2 
    lda #'a'
    ldy #0
    sta (pscreen),y
    // [6] *((const byte**) main::pscreen#0) ← ++ *((const byte**) main::pscreen#0) -- _deref_pptc1=_inc__deref_pptc1 
    inc pscreen
    bne !+
    inc pscreen+1
  !:
    // [7] *(*((const byte**) main::pscreen#0)) ← (byte) 'b' -- _deref__deref_pptc1=vbuc2 
    lda #'b'
    ldy #0
    sta (pscreen),y
    jmp breturn
    // main::@return
  breturn:
    // [8] return 
    rts
}
  // File Data

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [4] (byte*) main::screen#0 ← (byte*) 1024 [ ] ( main:2 [ ] ) always clobbers reg byte a 
Statement [5] *(*((const byte**) main::pscreen#0)) ← (byte) 'a' [ ] ( main:2 [ ] ) always clobbers reg byte a reg byte y 
Statement [7] *(*((const byte**) main::pscreen#0)) ← (byte) 'b' [ ] ( main:2 [ ] ) always clobbers reg byte a reg byte y 
Potential registers zp ZP_WORD:2 [ main::screen#0 ] : zp ZP_WORD:2 , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 20: zp ZP_WORD:2 [ main::screen#0 ] 
Uplift Scope [] 

Uplifting [main] best 65 combination zp ZP_WORD:2 [ main::screen#0 ] 
Uplifting [] best 65 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Tests optimization of constant pointers to pointers
  // Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  // @begin
bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
  // @1
b1:
  // [2] call main 
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
  // @end
bend:
  // main
main: {
    .label pscreen = screen
    .label screen = 2
    // [4] (byte*) main::screen#0 ← (byte*) 1024 -- pbuz1=pbuc1 
    lda #<$400
    sta screen
    lda #>$400
    sta screen+1
    // [5] *(*((const byte**) main::pscreen#0)) ← (byte) 'a' -- _deref__deref_pptc1=vbuc2 
    lda #'a'
    ldy #0
    sta (pscreen),y
    // [6] *((const byte**) main::pscreen#0) ← ++ *((const byte**) main::pscreen#0) -- _deref_pptc1=_inc__deref_pptc1 
    inc pscreen
    bne !+
    inc pscreen+1
  !:
    // [7] *(*((const byte**) main::pscreen#0)) ← (byte) 'b' -- _deref__deref_pptc1=vbuc2 
    lda #'b'
    ldy #0
    sta (pscreen),y
    jmp breturn
    // main::@return
  breturn:
    // [8] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp b1
Removing instruction jmp bend
Removing instruction jmp breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction b1_from_bbegin:
Removing instruction b1:
Removing instruction bend_from_b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction bend:
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
(void()) main()
(label) main::@return
(byte**) main::pscreen
(const byte**) main::pscreen#0 pscreen = &(byte*) main::screen#0
(byte*) main::screen
(byte*) main::screen#0 screen zp ZP_WORD:2 20.0

zp ZP_WORD:2 [ main::screen#0 ]


FINAL ASSEMBLER
Score: 50

  // File Comments
// Tests optimization of constant pointers to pointers
  // Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  // @begin
  // [1] phi from @begin to @1 [phi:@begin->@1]
  // @1
  // [2] call main 
  // [3] phi from @1 to @end [phi:@1->@end]
  // @end
  // main
main: {
    .label pscreen = screen
    .label screen = 2
    // screen = 0x400
    // [4] (byte*) main::screen#0 ← (byte*) 1024 -- pbuz1=pbuc1 
    lda #<$400
    sta screen
    lda #>$400
    sta screen+1
    // **pscreen = 'a'
    // [5] *(*((const byte**) main::pscreen#0)) ← (byte) 'a' -- _deref__deref_pptc1=vbuc2 
    lda #'a'
    ldy #0
    sta (pscreen),y
    // (*pscreen)++;
    // [6] *((const byte**) main::pscreen#0) ← ++ *((const byte**) main::pscreen#0) -- _deref_pptc1=_inc__deref_pptc1 
    inc pscreen
    bne !+
    inc pscreen+1
  !:
    // **pscreen = 'b'
    // [7] *(*((const byte**) main::pscreen#0)) ← (byte) 'b' -- _deref__deref_pptc1=vbuc2 
    lda #'b'
    ldy #0
    sta (pscreen),y
    // main::@return
    // }
    // [8] return 
    rts
}
  // File Data

