Culled Empty Block (label) main::@2

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  to:@1

(void()) main()
main: scope:[main]  from @1
  (byte) main::idx#0 ← (byte) 0
  (byte) main::i#0 ← (byte) 0
  to:main::@1
main::@1: scope:[main]  from main main::@1
  (byte) main::idx#2 ← phi( main/(byte) main::idx#0 main::@1/(byte) main::idx#1 )
  (byte) main::i#2 ← phi( main/(byte) main::i#0 main::@1/(byte) main::i#1 )
  *((const byte*) main::SCREEN + (byte) main::idx#2) ← *((const byte*) chars + (byte) main::i#2)
  (byte) main::idx#1 ← ++ (byte) main::idx#2
  (byte) main::i#1 ← (byte) main::i#2 + rangenext(0,2)
  (bool~) main::$0 ← (byte) main::i#1 != rangelast(0,2)
  if((bool~) main::$0) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@1
  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
(const byte*) chars[]  = { (byte) 1, (byte) 2, (byte) 3 }
(void()) main()
(bool~) main::$0
(label) main::@1
(label) main::@return
(const byte*) main::SCREEN = (byte*)(number) $400
(byte) main::i
(byte) main::i#0
(byte) main::i#1
(byte) main::i#2
(byte) main::idx
(byte) main::idx#0
(byte) main::idx#1
(byte) main::idx#2

Simplifying constant pointer cast (byte*) 1024
Successful SSA optimization PassNCastSimplification
Simple Condition (bool~) main::$0 [7] if((byte) main::i#1!=rangelast(0,2)) goto main::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const byte) main::idx#0 = 0
Constant (const byte) main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Resolved ranged next value [5] main::i#1 ← ++ main::i#2 to ++
Resolved ranged comparison value [7] if(main::i#1!=rangelast(0,2)) goto main::@1 to (number) 3
Adding number conversion cast (unumber) 3 in if((byte) main::i#1!=(number) 3) goto main::@1
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast 3
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 3
Successful SSA optimization PassNFinalizeNumberTypeConversions
Inlining constant with var siblings (const byte) main::idx#0
Inlining constant with var siblings (const byte) main::i#0
Constant inlined main::i#0 = (byte) 0
Constant inlined main::idx#0 = (byte) 0
Successful SSA optimization Pass2ConstantInlining
Added new block during phi lifting main::@3(between main::@1 and main::@1)
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
Adding NOP phi() at start of main
CALL GRAPH
Calls in [] to main:2 

Created 2 initial phi equivalence classes
Coalesced [12] main::i#3 ← main::i#1
Coalesced [13] main::idx#3 ← main::idx#1
Coalesced down to 2 phi equivalence classes
Culled Empty Block (label) @2
Culled Empty Block (label) main::@3
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()
  to:main::@1
main::@1: scope:[main]  from main main::@1
  [5] (byte) main::idx#2 ← phi( main/(byte) 0 main::@1/(byte) main::idx#1 )
  [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@1/(byte) main::i#1 )
  [6] *((const byte*) main::SCREEN + (byte) main::idx#2) ← *((const byte*) chars + (byte) main::i#2)
  [7] (byte) main::idx#1 ← ++ (byte) main::idx#2
  [8] (byte) main::i#1 ← ++ (byte) main::i#2
  [9] if((byte) main::i#1!=(byte) 3) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@1
  [10] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(void()) main()
(byte) main::i
(byte) main::i#1 16.5
(byte) main::i#2 11.0
(byte) main::idx
(byte) main::idx#1 7.333333333333333
(byte) main::idx#2 16.5

Initial phi equivalence classes
[ main::i#2 main::i#1 ]
[ main::idx#2 main::idx#1 ]
Complete equivalence classes
[ main::i#2 main::i#1 ]
[ main::idx#2 main::idx#1 ]
Allocated zp[1]:2 [ main::i#2 main::i#1 ]
Allocated zp[1]:3 [ main::idx#2 main::idx#1 ]

INITIAL ASM
Target platform is c64basic / MOS6502X
  // File Comments
// Demonstrates initializing an object using = { ... } syntax
// Array of chars
  // 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 
  // [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 SCREEN = $400
    .label idx = 3
    .label i = 2
    // [5] phi from main to main::@1 [phi:main->main::@1]
  __b1_from_main:
    // [5] phi (byte) main::idx#2 = (byte) 0 [phi:main->main::@1#0] -- vbuz1=vbuc1 
    lda #0
    sta.z idx
    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#1] -- vbuz1=vbuc1 
    lda #0
    sta.z i
    jmp __b1
    // [5] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
  __b1_from___b1:
    // [5] phi (byte) main::idx#2 = (byte) main::idx#1 [phi:main::@1->main::@1#0] -- register_copy 
    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@1->main::@1#1] -- register_copy 
    jmp __b1
    // main::@1
  __b1:
    // [6] *((const byte*) main::SCREEN + (byte) main::idx#2) ← *((const byte*) chars + (byte) main::i#2) -- pbuc1_derefidx_vbuz1=pbuc2_derefidx_vbuz2 
    ldy.z i
    lda chars,y
    ldy.z idx
    sta SCREEN,y
    // [7] (byte) main::idx#1 ← ++ (byte) main::idx#2 -- vbuz1=_inc_vbuz1 
    inc.z idx
    // [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuz1=_inc_vbuz1 
    inc.z i
    // [9] if((byte) main::i#1!=(byte) 3) goto main::@1 -- vbuz1_neq_vbuc1_then_la1 
    lda #3
    cmp.z i
    bne __b1_from___b1
    jmp __breturn
    // main::@return
  __breturn:
    // [10] return 
    rts
}
  // File Data
  chars: .byte 1, 2, 3

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [6] *((const byte*) main::SCREEN + (byte) main::idx#2) ← *((const byte*) chars + (byte) main::i#2) [ main::i#2 main::idx#2 ] ( main:2 [ main::i#2 main::idx#2 ] ) always clobbers reg byte a 
Removing always clobbered register reg byte a as potential for zp[1]:2 [ main::i#2 main::i#1 ]
Removing always clobbered register reg byte a as potential for zp[1]:3 [ main::idx#2 main::idx#1 ]
Statement [6] *((const byte*) main::SCREEN + (byte) main::idx#2) ← *((const byte*) chars + (byte) main::i#2) [ main::i#2 main::idx#2 ] ( main:2 [ main::i#2 main::idx#2 ] ) always clobbers reg byte a 
Potential registers zp[1]:2 [ main::i#2 main::i#1 ] : zp[1]:2 , reg byte x , reg byte y , 
Potential registers zp[1]:3 [ main::idx#2 main::idx#1 ] : zp[1]:3 , reg byte x , reg byte y , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 27.5: zp[1]:2 [ main::i#2 main::i#1 ] 23.83: zp[1]:3 [ main::idx#2 main::idx#1 ] 
Uplift Scope [] 

Uplifting [main] best 328 combination reg byte y [ main::i#2 main::i#1 ] reg byte x [ main::idx#2 main::idx#1 ] 
Uplifting [] best 328 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Demonstrates initializing an object using = { ... } syntax
// Array of chars
  // 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 
  // [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 SCREEN = $400
    // [5] phi from main to main::@1 [phi:main->main::@1]
  __b1_from_main:
    // [5] phi (byte) main::idx#2 = (byte) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
    ldx #0
    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#1] -- vbuyy=vbuc1 
    ldy #0
    jmp __b1
    // [5] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
  __b1_from___b1:
    // [5] phi (byte) main::idx#2 = (byte) main::idx#1 [phi:main::@1->main::@1#0] -- register_copy 
    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@1->main::@1#1] -- register_copy 
    jmp __b1
    // main::@1
  __b1:
    // [6] *((const byte*) main::SCREEN + (byte) main::idx#2) ← *((const byte*) chars + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuyy 
    lda chars,y
    sta SCREEN,x
    // [7] (byte) main::idx#1 ← ++ (byte) main::idx#2 -- vbuxx=_inc_vbuxx 
    inx
    // [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuyy=_inc_vbuyy 
    iny
    // [9] if((byte) main::i#1!=(byte) 3) goto main::@1 -- vbuyy_neq_vbuc1_then_la1 
    cpy #3
    bne __b1_from___b1
    jmp __breturn
    // main::@return
  __breturn:
    // [10] return 
    rts
}
  // File Data
  chars: .byte 1, 2, 3

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __bend
Removing instruction jmp __b1
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label __bbegin with __b1
Replacing label __b1_from___b1 with __b1
Removing instruction __bbegin:
Removing instruction __b1_from___bbegin:
Removing instruction main_from___b1:
Removing instruction __bend_from___b1:
Removing instruction __b1_from___b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __bend:
Removing instruction __b1_from_main:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Updating BasicUpstart to call main directly
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Removing instruction jmp __b1
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction __b1:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(const byte*) chars[]  = { (byte) 1, (byte) 2, (byte) 3 }
(void()) main()
(label) main::@1
(label) main::@return
(const byte*) main::SCREEN = (byte*) 1024
(byte) main::i
(byte) main::i#1 reg byte y 16.5
(byte) main::i#2 reg byte y 11.0
(byte) main::idx
(byte) main::idx#1 reg byte x 7.333333333333333
(byte) main::idx#2 reg byte x 16.5

reg byte y [ main::i#2 main::i#1 ]
reg byte x [ main::idx#2 main::idx#1 ]


FINAL ASSEMBLER
Score: 226

  // File Comments
// Demonstrates initializing an object using = { ... } syntax
// Array of chars
  // 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 
  // [4] phi from @1 to main [phi:@1->main]
  // [3] phi from @1 to @end [phi:@1->@end]
  // @end
  // main
main: {
    .label SCREEN = $400
    // [5] phi from main to main::@1 [phi:main->main::@1]
    // [5] phi (byte) main::idx#2 = (byte) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
    ldx #0
    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#1] -- vbuyy=vbuc1 
    ldy #0
    // [5] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
    // [5] phi (byte) main::idx#2 = (byte) main::idx#1 [phi:main::@1->main::@1#0] -- register_copy 
    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@1->main::@1#1] -- register_copy 
    // main::@1
  __b1:
    // SCREEN[idx++] = chars[i]
    // [6] *((const byte*) main::SCREEN + (byte) main::idx#2) ← *((const byte*) chars + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuyy 
    lda chars,y
    sta SCREEN,x
    // SCREEN[idx++] = chars[i];
    // [7] (byte) main::idx#1 ← ++ (byte) main::idx#2 -- vbuxx=_inc_vbuxx 
    inx
    // for( char i: 0..2)
    // [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuyy=_inc_vbuyy 
    iny
    // [9] if((byte) main::i#1!=(byte) 3) goto main::@1 -- vbuyy_neq_vbuc1_then_la1 
    cpy #3
    bne __b1
    // main::@return
    // }
    // [10] return 
    rts
}
  // File Data
  chars: .byte 1, 2, 3

