
CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  (byte*) SCREEN#0 ← ((byte*)) (word/signed word/dword/signed dword) 1024
  to:@1
main: scope:[main]  from @1
  (byte*) SCREEN#3 ← phi( @1/(byte*) SCREEN#5 )
  (byte) main::i#0 ← (byte/signed byte/word/signed word/dword/signed dword) 0
  to:main::@1
main::@1: scope:[main]  from main main::@2
  (byte*) SCREEN#2 ← phi( main/(byte*) SCREEN#3 main::@2/(byte*) SCREEN#4 )
  (byte) main::i#2 ← phi( main/(byte) main::i#0 main::@2/(byte) main::i#1 )
  (bool~) main::$0 ← (byte) main::i#2 < (byte/signed byte/word/signed word/dword/signed dword) 50
  (bool~) main::$1 ← ! (bool~) main::$0
  if((bool~) main::$1) goto main::@2
  to:main::@3
main::@2: scope:[main]  from main::@1 main::@3
  (byte*) SCREEN#4 ← phi( main::@1/(byte*) SCREEN#2 main::@3/(byte*) SCREEN#1 )
  (byte) main::i#3 ← phi( main::@1/(byte) main::i#2 main::@3/(byte) main::i#4 )
  (byte) main::i#1 ← ++ (byte) main::i#3
  (bool~) main::$2 ← (byte) main::i#1 < (byte/signed byte/word/signed word/dword/signed dword) 100
  if((bool~) main::$2) goto main::@1
  to:main::@return
main::@3: scope:[main]  from main::@1
  (byte*) SCREEN#1 ← phi( main::@1/(byte*) SCREEN#2 )
  (byte) main::i#4 ← phi( main::@1/(byte) main::i#2 )
  *((byte*) SCREEN#1) ← (byte) main::i#4
  to:main::@2
main::@return: scope:[main]  from main::@2
  return 
  to:@return
@1: scope:[]  from @begin
  (byte*) SCREEN#5 ← phi( @begin/(byte*) SCREEN#0 )
  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
(byte*) SCREEN
(byte*) SCREEN#0
(byte*) SCREEN#1
(byte*) SCREEN#2
(byte*) SCREEN#3
(byte*) SCREEN#4
(byte*) SCREEN#5
(void()) main()
(bool~) main::$0
(bool~) main::$1
(bool~) main::$2
(label) main::@1
(label) main::@2
(label) main::@3
(label) main::@return
(byte) main::i
(byte) main::i#0
(byte) main::i#1
(byte) main::i#2
(byte) main::i#3
(byte) main::i#4

Culled Empty Block (label) @2
Successful SSA optimization Pass2CullEmptyBlocks
Inversing boolean not [5] (bool~) main::$1 ← (byte) main::i#2 >= (byte/signed byte/word/signed word/dword/signed dword) 50 from [4] (bool~) main::$0 ← (byte) main::i#2 < (byte/signed byte/word/signed word/dword/signed dword) 50
Successful SSA optimization Pass2UnaryNotSimplification
Alias (byte) main::i#2 = (byte) main::i#4 
Alias (byte*) SCREEN#1 = (byte*) SCREEN#2 
Alias (byte*) SCREEN#0 = (byte*) SCREEN#5 
Successful SSA optimization Pass2AliasElimination
Alias (byte) main::i#2 = (byte) main::i#3 
Alias (byte*) SCREEN#1 = (byte*) SCREEN#4 
Successful SSA optimization Pass2AliasElimination
Self Phi Eliminated (byte*) SCREEN#1
Successful SSA optimization Pass2SelfPhiElimination
Redundant Phi (byte*) SCREEN#3 (byte*) SCREEN#0
Redundant Phi (byte*) SCREEN#1 (byte*) SCREEN#3
Successful SSA optimization Pass2RedundantPhiElimination
Simple Condition (bool~) main::$1 [6] if((byte) main::i#2>=(byte/signed byte/word/signed word/dword/signed dword) 50) goto main::@2
Simple Condition (bool~) main::$2 [10] if((byte) main::i#1<(byte/signed byte/word/signed word/dword/signed dword) 100) goto main::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const byte*) SCREEN#0 = ((byte*))1024
Constant (const byte) main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Inlining constant with var siblings (const byte) main::i#0
Constant inlined main::i#0 = (byte/signed byte/word/signed word/dword/signed dword) 0
Successful SSA optimization Pass2ConstantInlining
Added new block during phi lifting main::@5(between main::@2 and main::@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
CALL GRAPH
Calls in [] to main:2 

Created 1 initial phi equivalence classes
Coalesced [11] main::i#5 ← main::i#1
Coalesced down to 1 phi equivalence classes
Culled Empty Block (label) main::@5
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()
main: scope:[main]  from @1
  [4] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@2
  [5] (byte) main::i#2 ← phi( main/(byte/signed byte/word/signed word/dword/signed dword) 0 main::@2/(byte) main::i#1 )
  [6] if((byte) main::i#2>=(byte/signed byte/word/signed word/dword/signed dword) 50) goto main::@2
  to:main::@3
main::@3: scope:[main]  from main::@1
  [7] *((const byte*) SCREEN#0) ← (byte) main::i#2
  to:main::@2
main::@2: scope:[main]  from main::@1 main::@3
  [8] (byte) main::i#1 ← ++ (byte) main::i#2
  [9] if((byte) main::i#1<(byte/signed byte/word/signed word/dword/signed dword) 100) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@2
  [10] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(byte*) SCREEN
(void()) main()
(byte) main::i
(byte) main::i#1 16.5
(byte) main::i#2 14.666666666666666

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

INITIAL ASM
//SEG0 File Comments
// Minimal if() test
//SEG1 Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
//SEG2 Global Constants & labels
  .label SCREEN = $400
//SEG3 @begin
bbegin:
//SEG4 [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
//SEG5 @1
b1:
//SEG6 [2] call main 
//SEG7 [4] phi from @1 to main [phi:@1->main]
main_from_b1:
  jsr main
//SEG8 [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
//SEG9 @end
bend:
//SEG10 main
main: {
    .label i = 2
  //SEG11 [5] phi from main to main::@1 [phi:main->main::@1]
  b1_from_main:
  //SEG12 [5] phi (byte) main::i#2 = (byte/signed byte/word/signed word/dword/signed dword) 0 [phi:main->main::@1#0] -- vbuz1=vbuc1 
    lda #0
    sta i
    jmp b1
  //SEG13 [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  b1_from_b2:
  //SEG14 [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
    jmp b1
  //SEG15 main::@1
  b1:
  //SEG16 [6] if((byte) main::i#2>=(byte/signed byte/word/signed word/dword/signed dword) 50) goto main::@2 -- vbuz1_ge_vbuc1_then_la1 
    lda i
    cmp #$32
    bcs b2
    jmp b3
  //SEG17 main::@3
  b3:
  //SEG18 [7] *((const byte*) SCREEN#0) ← (byte) main::i#2 -- _deref_pbuc1=vbuz1 
    lda i
    sta SCREEN
    jmp b2
  //SEG19 main::@2
  b2:
  //SEG20 [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuz1=_inc_vbuz1 
    inc i
  //SEG21 [9] if((byte) main::i#1<(byte/signed byte/word/signed word/dword/signed dword) 100) goto main::@1 -- vbuz1_lt_vbuc1_then_la1 
    lda i
    cmp #$64
    bcc b1_from_b2
    jmp breturn
  //SEG22 main::@return
  breturn:
  //SEG23 [10] return 
    rts
}

REGISTER UPLIFT POTENTIAL REGISTERS
Potential registers zp ZP_BYTE:2 [ main::i#2 main::i#1 ] : zp ZP_BYTE:2 , reg byte a , reg byte x , reg byte y , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 31.17: zp ZP_BYTE:2 [ main::i#2 main::i#1 ] 
Uplift Scope [] 

Uplifting [main] best 338 combination reg byte x [ main::i#2 main::i#1 ] 
Uplifting [] best 338 combination 

ASSEMBLER BEFORE OPTIMIZATION
//SEG0 File Comments
// Minimal if() test
//SEG1 Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
//SEG2 Global Constants & labels
  .label SCREEN = $400
//SEG3 @begin
bbegin:
//SEG4 [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
//SEG5 @1
b1:
//SEG6 [2] call main 
//SEG7 [4] phi from @1 to main [phi:@1->main]
main_from_b1:
  jsr main
//SEG8 [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
//SEG9 @end
bend:
//SEG10 main
main: {
  //SEG11 [5] phi from main to main::@1 [phi:main->main::@1]
  b1_from_main:
  //SEG12 [5] phi (byte) main::i#2 = (byte/signed byte/word/signed word/dword/signed dword) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
    ldx #0
    jmp b1
  //SEG13 [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  b1_from_b2:
  //SEG14 [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
    jmp b1
  //SEG15 main::@1
  b1:
  //SEG16 [6] if((byte) main::i#2>=(byte/signed byte/word/signed word/dword/signed dword) 50) goto main::@2 -- vbuxx_ge_vbuc1_then_la1 
    cpx #$32
    bcs b2
    jmp b3
  //SEG17 main::@3
  b3:
  //SEG18 [7] *((const byte*) SCREEN#0) ← (byte) main::i#2 -- _deref_pbuc1=vbuxx 
    stx SCREEN
    jmp b2
  //SEG19 main::@2
  b2:
  //SEG20 [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
    inx
  //SEG21 [9] if((byte) main::i#1<(byte/signed byte/word/signed word/dword/signed dword) 100) goto main::@1 -- vbuxx_lt_vbuc1_then_la1 
    cpx #$64
    bcc b1_from_b2
    jmp breturn
  //SEG22 main::@return
  breturn:
  //SEG23 [10] return 
    rts
}

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp b1
Removing instruction jmp bend
Removing instruction jmp b1
Removing instruction jmp b3
Removing instruction jmp b2
Removing instruction jmp breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label b1_from_b2 with b1
Removing instruction b1_from_bbegin:
Removing instruction b1:
Removing instruction main_from_b1:
Removing instruction bend_from_b1:
Removing instruction b1_from_b2:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction bend:
Removing instruction b1_from_main:
Removing instruction b3:
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 bbegin:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(byte*) SCREEN
(const byte*) SCREEN#0 SCREEN = ((byte*))(word/signed word/dword/signed dword) 1024
(void()) main()
(label) main::@1
(label) main::@2
(label) main::@3
(label) main::@return
(byte) main::i
(byte) main::i#1 reg byte x 16.5
(byte) main::i#2 reg byte x 14.666666666666666

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


FINAL ASSEMBLER
Score: 176

//SEG0 File Comments
// Minimal if() test
//SEG1 Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
//SEG2 Global Constants & labels
  .label SCREEN = $400
//SEG3 @begin
//SEG4 [1] phi from @begin to @1 [phi:@begin->@1]
//SEG5 @1
//SEG6 [2] call main 
//SEG7 [4] phi from @1 to main [phi:@1->main]
//SEG8 [3] phi from @1 to @end [phi:@1->@end]
//SEG9 @end
//SEG10 main
main: {
  //SEG11 [5] phi from main to main::@1 [phi:main->main::@1]
  //SEG12 [5] phi (byte) main::i#2 = (byte/signed byte/word/signed word/dword/signed dword) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
    ldx #0
  //SEG13 [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  //SEG14 [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
  //SEG15 main::@1
  b1:
  //SEG16 [6] if((byte) main::i#2>=(byte/signed byte/word/signed word/dword/signed dword) 50) goto main::@2 -- vbuxx_ge_vbuc1_then_la1 
    cpx #$32
    bcs b2
  //SEG17 main::@3
  //SEG18 [7] *((const byte*) SCREEN#0) ← (byte) main::i#2 -- _deref_pbuc1=vbuxx 
    stx SCREEN
  //SEG19 main::@2
  b2:
  //SEG20 [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
    inx
  //SEG21 [9] if((byte) main::i#1<(byte/signed byte/word/signed word/dword/signed dword) 100) goto main::@1 -- vbuxx_lt_vbuc1_then_la1 
    cpx #$64
    bcc b1
  //SEG22 main::@return
  //SEG23 [10] return 
    rts
}

