
CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  (byte*) SCREEN#0 ← ((byte*)) (word/signed word/dword/signed dword) 1024
  to:@2
main: scope:[main]  from @2
  (byte*) SCREEN#4 ← phi( @2/(byte*) SCREEN#6 )
  (byte) main::i#0 ← (byte/signed byte/word/signed word/dword/signed dword) 100
  to:main::@1
main::@1: scope:[main]  from main main::@3
  (byte*) SCREEN#3 ← phi( main/(byte*) SCREEN#4 main::@3/(byte*) SCREEN#5 )
  (byte) main::i#3 ← phi( main/(byte) main::i#0 main::@3/(byte) main::i#1 )
  call nest 
  to:main::@3
main::@3: scope:[main]  from main::@1
  (byte*) SCREEN#5 ← phi( main::@1/(byte*) SCREEN#3 )
  (byte) main::i#2 ← phi( main::@1/(byte) main::i#3 )
  (byte) main::i#1 ← -- (byte) main::i#2
  (bool~) main::$1 ← (byte) main::i#1 > (byte/signed byte/word/signed word/dword/signed dword) 0
  if((bool~) main::$1) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@3
  return 
  to:@return
nest: scope:[nest]  from main::@1
  (byte*) SCREEN#2 ← phi( main::@1/(byte*) SCREEN#3 )
  (byte) nest::j#0 ← (byte/signed byte/word/signed word/dword/signed dword) 100
  to:nest::@1
nest::@1: scope:[nest]  from nest nest::@1
  (byte*) SCREEN#1 ← phi( nest/(byte*) SCREEN#2 nest::@1/(byte*) SCREEN#1 )
  (byte) nest::j#2 ← phi( nest/(byte) nest::j#0 nest::@1/(byte) nest::j#1 )
  *((byte*) SCREEN#1) ← (byte) nest::j#2
  (byte) nest::j#1 ← -- (byte) nest::j#2
  (bool~) nest::$0 ← (byte) nest::j#1 > (byte/signed byte/word/signed word/dword/signed dword) 0
  if((bool~) nest::$0) goto nest::@1
  to:nest::@return
nest::@return: scope:[nest]  from nest::@1
  return 
  to:@return
@2: scope:[]  from @begin
  (byte*) SCREEN#6 ← phi( @begin/(byte*) SCREEN#0 )
  call main 
  to:@3
@3: scope:[]  from @2
  to:@end
@end: scope:[]  from @3

SYMBOL TABLE SSA
(label) @2
(label) @3
(label) @begin
(label) @end
(byte*) SCREEN
(byte*) SCREEN#0
(byte*) SCREEN#1
(byte*) SCREEN#2
(byte*) SCREEN#3
(byte*) SCREEN#4
(byte*) SCREEN#5
(byte*) SCREEN#6
(void()) main()
(bool~) main::$1
(label) main::@1
(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
(void()) nest()
(bool~) nest::$0
(label) nest::@1
(label) nest::@return
(byte) nest::j
(byte) nest::j#0
(byte) nest::j#1
(byte) nest::j#2

Culled Empty Block (label) @3
Successful SSA optimization Pass2CullEmptyBlocks
Alias (byte) main::i#2 = (byte) main::i#3 
Alias (byte*) SCREEN#3 = (byte*) SCREEN#5 
Alias (byte*) SCREEN#0 = (byte*) SCREEN#6 
Successful SSA optimization Pass2AliasElimination
Self Phi Eliminated (byte*) SCREEN#3
Self Phi Eliminated (byte*) SCREEN#1
Successful SSA optimization Pass2SelfPhiElimination
Redundant Phi (byte*) SCREEN#4 (byte*) SCREEN#0
Redundant Phi (byte*) SCREEN#3 (byte*) SCREEN#4
Redundant Phi (byte*) SCREEN#2 (byte*) SCREEN#3
Redundant Phi (byte*) SCREEN#1 (byte*) SCREEN#2
Successful SSA optimization Pass2RedundantPhiElimination
Simple Condition (bool~) main::$1 [8] if((byte) main::i#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto main::@1
Simple Condition (bool~) nest::$0 [16] if((byte) nest::j#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto nest::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const byte*) SCREEN#0 = ((byte*))1024
Constant (const byte) main::i#0 = 100
Constant (const byte) nest::j#0 = 100
Successful SSA optimization Pass2ConstantIdentification
Inlining constant with var siblings (const byte) main::i#0
Inlining constant with var siblings (const byte) nest::j#0
Constant inlined main::i#0 = (byte/signed byte/word/signed word/dword/signed dword) 100
Constant inlined nest::j#0 = (byte/signed byte/word/signed word/dword/signed dword) 100
Successful SSA optimization Pass2ConstantInlining
Added new block during phi lifting main::@4(between main::@3 and main::@1)
Added new block during phi lifting nest::@3(between nest::@1 and nest::@1)
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @2
Adding NOP phi() at start of @end
Adding NOP phi() at start of main
Adding NOP phi() at start of nest
CALL GRAPH
Calls in [] to main:2 
Calls in [main] to nest:6 

Created 2 initial phi equivalence classes
Coalesced [10] main::i#4 ← main::i#1
Coalesced [17] nest::j#3 ← nest::j#1
Coalesced down to 2 phi equivalence classes
Culled Empty Block (label) main::@4
Culled Empty Block (label) nest::@3
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @2
Adding NOP phi() at start of @end
Adding NOP phi() at start of main
Adding NOP phi() at start of nest

FINAL CONTROL FLOW GRAPH
@begin: scope:[]  from
  [0] phi()
  to:@2
@2: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @2
  [3] phi()
main: scope:[main]  from @2
  [4] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@3
  [5] (byte) main::i#2 ← phi( main/(byte/signed byte/word/signed word/dword/signed dword) 100 main::@3/(byte) main::i#1 )
  [6] call nest 
  to:main::@3
main::@3: scope:[main]  from main::@1
  [7] (byte) main::i#1 ← -- (byte) main::i#2
  [8] if((byte) main::i#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@3
  [9] return 
  to:@return
nest: scope:[nest]  from main::@1
  [10] phi()
  to:nest::@1
nest::@1: scope:[nest]  from nest nest::@1
  [11] (byte) nest::j#2 ← phi( nest/(byte/signed byte/word/signed word/dword/signed dword) 100 nest::@1/(byte) nest::j#1 )
  [12] *((const byte*) SCREEN#0) ← (byte) nest::j#2
  [13] (byte) nest::j#1 ← -- (byte) nest::j#2
  [14] if((byte) nest::j#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto nest::@1
  to:nest::@return
nest::@return: scope:[nest]  from nest::@1
  [15] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(byte*) SCREEN
(void()) main()
(byte) main::i
(byte) main::i#1 16.5
(byte) main::i#2 11.0
(void()) nest()
(byte) nest::j
(byte) nest::j#1 151.5
(byte) nest::j#2 151.5

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

INITIAL ASM
//SEG0 File Comments
//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 @2 [phi:@begin->@2]
b2_from_bbegin:
  jmp b2
//SEG5 @2
b2:
//SEG6 [2] call main 
//SEG7 [4] phi from @2 to main [phi:@2->main]
main_from_b2:
  jsr main
//SEG8 [3] phi from @2 to @end [phi:@2->@end]
bend_from_b2:
  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) 100 [phi:main->main::@1#0] -- vbuz1=vbuc1 
    lda #$64
    sta i
    jmp b1
  //SEG13 [5] phi from main::@3 to main::@1 [phi:main::@3->main::@1]
  b1_from_b3:
  //SEG14 [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@3->main::@1#0] -- register_copy 
    jmp b1
  //SEG15 main::@1
  b1:
  //SEG16 [6] call nest 
  //SEG17 [10] phi from main::@1 to nest [phi:main::@1->nest]
  nest_from_b1:
    jsr nest
    jmp b3
  //SEG18 main::@3
  b3:
  //SEG19 [7] (byte) main::i#1 ← -- (byte) main::i#2 -- vbuz1=_dec_vbuz1 
    dec i
  //SEG20 [8] if((byte) main::i#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto main::@1 -- vbuz1_gt_0_then_la1 
    lda i
    bne b1_from_b3
    jmp breturn
  //SEG21 main::@return
  breturn:
  //SEG22 [9] return 
    rts
}
//SEG23 nest
nest: {
    .label j = 3
  //SEG24 [11] phi from nest to nest::@1 [phi:nest->nest::@1]
  b1_from_nest:
  //SEG25 [11] phi (byte) nest::j#2 = (byte/signed byte/word/signed word/dword/signed dword) 100 [phi:nest->nest::@1#0] -- vbuz1=vbuc1 
    lda #$64
    sta j
    jmp b1
  //SEG26 [11] phi from nest::@1 to nest::@1 [phi:nest::@1->nest::@1]
  b1_from_b1:
  //SEG27 [11] phi (byte) nest::j#2 = (byte) nest::j#1 [phi:nest::@1->nest::@1#0] -- register_copy 
    jmp b1
  //SEG28 nest::@1
  b1:
  //SEG29 [12] *((const byte*) SCREEN#0) ← (byte) nest::j#2 -- _deref_pbuc1=vbuz1 
    lda j
    sta SCREEN
  //SEG30 [13] (byte) nest::j#1 ← -- (byte) nest::j#2 -- vbuz1=_dec_vbuz1 
    dec j
  //SEG31 [14] if((byte) nest::j#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto nest::@1 -- vbuz1_gt_0_then_la1 
    lda j
    bne b1_from_b1
    jmp breturn
  //SEG32 nest::@return
  breturn:
  //SEG33 [15] 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 , 
Potential registers zp ZP_BYTE:3 [ nest::j#2 nest::j#1 ] : zp ZP_BYTE:3 , reg byte a , reg byte x , reg byte y , 

REGISTER UPLIFT SCOPES
Uplift Scope [nest] 303: zp ZP_BYTE:3 [ nest::j#2 nest::j#1 ] 
Uplift Scope [main] 27.5: zp ZP_BYTE:2 [ main::i#2 main::i#1 ] 
Uplift Scope [] 

Uplifting [nest] best 2428 combination reg byte x [ nest::j#2 nest::j#1 ] 
Uplifting [main] best 2358 combination reg byte y [ main::i#2 main::i#1 ] 
Uplifting [] best 2358 combination 

ASSEMBLER BEFORE OPTIMIZATION
//SEG0 File Comments
//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 @2 [phi:@begin->@2]
b2_from_bbegin:
  jmp b2
//SEG5 @2
b2:
//SEG6 [2] call main 
//SEG7 [4] phi from @2 to main [phi:@2->main]
main_from_b2:
  jsr main
//SEG8 [3] phi from @2 to @end [phi:@2->@end]
bend_from_b2:
  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) 100 [phi:main->main::@1#0] -- vbuyy=vbuc1 
    ldy #$64
    jmp b1
  //SEG13 [5] phi from main::@3 to main::@1 [phi:main::@3->main::@1]
  b1_from_b3:
  //SEG14 [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@3->main::@1#0] -- register_copy 
    jmp b1
  //SEG15 main::@1
  b1:
  //SEG16 [6] call nest 
  //SEG17 [10] phi from main::@1 to nest [phi:main::@1->nest]
  nest_from_b1:
    jsr nest
    jmp b3
  //SEG18 main::@3
  b3:
  //SEG19 [7] (byte) main::i#1 ← -- (byte) main::i#2 -- vbuyy=_dec_vbuyy 
    dey
  //SEG20 [8] if((byte) main::i#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto main::@1 -- vbuyy_gt_0_then_la1 
    cpy #0
    bne b1_from_b3
    jmp breturn
  //SEG21 main::@return
  breturn:
  //SEG22 [9] return 
    rts
}
//SEG23 nest
nest: {
  //SEG24 [11] phi from nest to nest::@1 [phi:nest->nest::@1]
  b1_from_nest:
  //SEG25 [11] phi (byte) nest::j#2 = (byte/signed byte/word/signed word/dword/signed dword) 100 [phi:nest->nest::@1#0] -- vbuxx=vbuc1 
    ldx #$64
    jmp b1
  //SEG26 [11] phi from nest::@1 to nest::@1 [phi:nest::@1->nest::@1]
  b1_from_b1:
  //SEG27 [11] phi (byte) nest::j#2 = (byte) nest::j#1 [phi:nest::@1->nest::@1#0] -- register_copy 
    jmp b1
  //SEG28 nest::@1
  b1:
  //SEG29 [12] *((const byte*) SCREEN#0) ← (byte) nest::j#2 -- _deref_pbuc1=vbuxx 
    stx SCREEN
  //SEG30 [13] (byte) nest::j#1 ← -- (byte) nest::j#2 -- vbuxx=_dec_vbuxx 
    dex
  //SEG31 [14] if((byte) nest::j#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto nest::@1 -- vbuxx_gt_0_then_la1 
    cpx #0
    bne b1_from_b1
    jmp breturn
  //SEG32 nest::@return
  breturn:
  //SEG33 [15] return 
    rts
}

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp b2
Removing instruction jmp bend
Removing instruction jmp b1
Removing instruction jmp b3
Removing instruction jmp breturn
Removing instruction jmp b1
Removing instruction jmp breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label b1_from_b3 with b1
Replacing label b1_from_b1 with b1
Removing instruction b2_from_bbegin:
Removing instruction b2:
Removing instruction main_from_b2:
Removing instruction bend_from_b2:
Removing instruction b1_from_b3:
Removing instruction nest_from_b1:
Removing instruction b1_from_b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction bend:
Removing instruction b1_from_main:
Removing instruction b3:
Removing instruction breturn:
Removing instruction b1_from_nest:
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
Removing instruction jmp b1
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction bbegin:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @2
(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::@3
(label) main::@return
(byte) main::i
(byte) main::i#1 reg byte y 16.5
(byte) main::i#2 reg byte y 11.0
(void()) nest()
(label) nest::@1
(label) nest::@return
(byte) nest::j
(byte) nest::j#1 reg byte x 151.5
(byte) nest::j#2 reg byte x 151.5

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


FINAL ASSEMBLER
Score: 1353

//SEG0 File Comments
//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 @2 [phi:@begin->@2]
//SEG5 @2
//SEG6 [2] call main 
//SEG7 [4] phi from @2 to main [phi:@2->main]
//SEG8 [3] phi from @2 to @end [phi:@2->@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) 100 [phi:main->main::@1#0] -- vbuyy=vbuc1 
    ldy #$64
  //SEG13 [5] phi from main::@3 to main::@1 [phi:main::@3->main::@1]
  //SEG14 [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@3->main::@1#0] -- register_copy 
  //SEG15 main::@1
  b1:
  //SEG16 [6] call nest 
  //SEG17 [10] phi from main::@1 to nest [phi:main::@1->nest]
    jsr nest
  //SEG18 main::@3
  //SEG19 [7] (byte) main::i#1 ← -- (byte) main::i#2 -- vbuyy=_dec_vbuyy 
    dey
  //SEG20 [8] if((byte) main::i#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto main::@1 -- vbuyy_gt_0_then_la1 
    cpy #0
    bne b1
  //SEG21 main::@return
  //SEG22 [9] return 
    rts
}
//SEG23 nest
nest: {
  //SEG24 [11] phi from nest to nest::@1 [phi:nest->nest::@1]
  //SEG25 [11] phi (byte) nest::j#2 = (byte/signed byte/word/signed word/dword/signed dword) 100 [phi:nest->nest::@1#0] -- vbuxx=vbuc1 
    ldx #$64
  //SEG26 [11] phi from nest::@1 to nest::@1 [phi:nest::@1->nest::@1]
  //SEG27 [11] phi (byte) nest::j#2 = (byte) nest::j#1 [phi:nest::@1->nest::@1#0] -- register_copy 
  //SEG28 nest::@1
  b1:
  //SEG29 [12] *((const byte*) SCREEN#0) ← (byte) nest::j#2 -- _deref_pbuc1=vbuxx 
    stx SCREEN
  //SEG30 [13] (byte) nest::j#1 ← -- (byte) nest::j#2 -- vbuxx=_dec_vbuxx 
    dex
  //SEG31 [14] if((byte) nest::j#1>(byte/signed byte/word/signed word/dword/signed dword) 0) goto nest::@1 -- vbuxx_gt_0_then_la1 
    cpx #0
    bne b1
  //SEG32 nest::@return
  //SEG33 [15] return 
    rts
}

