Identified constant variable (byte*) main::SCREEN
Culled Empty Block (label) main::@4
Culled Empty Block (label) main::@3
Culled Empty Block (label) main::@5
Culled Empty Block (label) main::@6

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

(void()) main()
main: scope:[main]  from @1
  (byte) main::i#0 ← (byte) 0
  to:main::@1
main::@1: scope:[main]  from main main::@2
  (byte) main::i#2 ← phi( main/(byte) main::i#0 main::@2/(byte) main::i#1 )
  (bool~) main::$0 ← (byte) main::i#2 < (number) 2
  unroll if((bool~) main::$0) goto main::@2
  to:main::@return
main::@2: scope:[main]  from main::@1
  (byte) main::i#3 ← phi( main::@1/(byte) main::i#2 )
  *((const byte*) main::SCREEN + (byte) main::i#3) ← (byte) 'a'
  (byte) main::i#1 ← ++ (byte) main::i#3
  to:main::@1
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
(void()) main()
(bool~) main::$0
(label) main::@1
(label) main::@2
(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::i#3

Adding number conversion cast (unumber) 2 in (bool~) main::$0 ← (byte) main::i#2 < (number) 2
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast 2
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 2
Successful SSA optimization PassNFinalizeNumberTypeConversions
Alias (byte) main::i#2 = (byte) main::i#3 
Successful SSA optimization Pass2AliasElimination
Simple Condition (bool~) main::$0 [3] unroll if((byte) main::i#2<(byte) 2) goto main::@2
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const byte) main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Unrolling loop Loop head: main::@1 tails: main::@2 blocks: main::@2 main::@1 
Successful SSA optimization Pass2LoopUnroll
Identical Phi Values (byte) main::i#2 (const byte) main::i#0
Successful SSA optimization Pass2IdenticalPhiElimination
Constant right-side identified [3] (byte) main::i#1 ← ++ (const byte) main::i#0
Successful SSA optimization Pass2ConstantRValueConsolidation
Constant (const byte) main::i#1 = ++main::i#0
Successful SSA optimization Pass2ConstantIdentification
if() condition always true - replacing block destination [1] if((const byte) main::i#0<(byte) 2) goto main::@2
Successful SSA optimization Pass2ConstantIfs
Simplifying expression containing zero main::SCREEN in [2] *((const byte*) main::SCREEN + (const byte) main::i#0) ← (byte) 'a'
Successful SSA optimization PassNSimplifyExpressionWithZero
Unrolling loop Loop head: main::@1_1 tails: main::@2_1 blocks: main::@2_1 main::@1_1 
Successful SSA optimization Pass2LoopUnroll
Identical Phi Values (byte) main::i#4 (const byte) main::i#1
Successful SSA optimization Pass2IdenticalPhiElimination
Constant right-side identified [6] (byte) main::i#5 ← ++ (const byte) main::i#1
Successful SSA optimization Pass2ConstantRValueConsolidation
Constant (const byte) main::i#5 = ++main::i#1
Successful SSA optimization Pass2ConstantIdentification
if() condition always true - replacing block destination [3] if((const byte) main::i#1<(byte) 2) goto main::@2_1
Successful SSA optimization Pass2ConstantIfs
Unrolling loop Loop head: main::@1_2 tails: main::@2_2 blocks: main::@2_2 main::@1_2 
Successful SSA optimization Pass2LoopUnroll
Identical Phi Values (byte) main::i#6 (const byte) main::i#5
Successful SSA optimization Pass2IdenticalPhiElimination
Constant right-side identified [7] (byte) main::i#7 ← ++ (const byte) main::i#5
Successful SSA optimization Pass2ConstantRValueConsolidation
Constant (const byte) main::i#7 = ++main::i#5
Successful SSA optimization Pass2ConstantIdentification
if() condition always false - eliminating [4] if((const byte) main::i#5<(byte) 2) goto main::@2_2
Successful SSA optimization Pass2ConstantIfs
Eliminating variable (byte) main::i#8 from unused block main::@1_3
Eliminating variable (byte) main::i#9 from unused block main::@2_3
Removing PHI-reference to removed block (main::@2_2) in block main::@1_3
Removing unused block main::@2_2
Removing unused block main::@1_3
Removing unused block main::@2_3
Successful SSA optimization Pass2EliminateUnusedBlocks
Eliminating unused constant (const byte) main::i#7
Successful SSA optimization PassNEliminateUnusedVars
Eliminating unused constant (const byte) main::i#5
Successful SSA optimization PassNEliminateUnusedVars
Inlining constant with different constant siblings (const byte) main::i#0
Inlining constant with different constant siblings (const byte) main::i#1
Constant inlined main::i#0 = (byte) 0
Constant inlined main::i#1 = ++(byte) 0
Successful SSA optimization Pass2ConstantInlining
Consolidated array index constant in *(main::SCREEN+++0)
Successful SSA optimization Pass2ConstantAdditionElimination
Simplifying constant integer increment ++0
Successful SSA optimization Pass2ConstantSimplification
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
Adding NOP phi() at start of main::@1
Adding NOP phi() at start of main::@1_1
Adding NOP phi() at start of main::@1_2
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
Culled Empty Block (label) main::@1
Culled Empty Block (label) main::@1_1
Culled Empty Block (label) main::@1_2
Renumbering block main::@2 to 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

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
  [5] *((const byte*) main::SCREEN) ← (byte) 'a'
  to:main::@2_1
main::@2_1: scope:[main]  from main::@1
  [6] *((const byte*) main::SCREEN+(byte) 1) ← (byte) 'a'
  to:main::@return
main::@return: scope:[main]  from main::@2_1
  [7] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(void()) main()
(byte) main::i

Initial phi equivalence classes
Complete equivalence classes

INITIAL ASM
Target platform is c64basic / MOS6502X
  // File Comments
// Minimal unrolled while() loop
  // 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
    jmp __b1
    // main::@1
  __b1:
    // [5] *((const byte*) main::SCREEN) ← (byte) 'a' -- _deref_pbuc1=vbuc2 
    lda #'a'
    sta SCREEN
    jmp __b2_1
    // main::@2_1
  __b2_1:
    // [6] *((const byte*) main::SCREEN+(byte) 1) ← (byte) 'a' -- _deref_pbuc1=vbuc2 
    lda #'a'
    sta SCREEN+1
    jmp __breturn
    // main::@return
  __breturn:
    // [7] return 
    rts
}
  // File Data

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [5] *((const byte*) main::SCREEN) ← (byte) 'a' [ ] ( main:2 [ ] ) always clobbers reg byte a 
Statement [6] *((const byte*) main::SCREEN+(byte) 1) ← (byte) 'a' [ ] ( main:2 [ ] ) always clobbers reg byte a 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 
Uplift Scope [] 

Uplifting [main] best 66 combination 
Uplifting [] best 66 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Minimal unrolled while() loop
  // 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
    jmp __b1
    // main::@1
  __b1:
    // [5] *((const byte*) main::SCREEN) ← (byte) 'a' -- _deref_pbuc1=vbuc2 
    lda #'a'
    sta SCREEN
    jmp __b2_1
    // main::@2_1
  __b2_1:
    // [6] *((const byte*) main::SCREEN+(byte) 1) ← (byte) 'a' -- _deref_pbuc1=vbuc2 
    lda #'a'
    sta SCREEN+1
    jmp __breturn
    // main::@return
  __breturn:
    // [7] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __bend
Removing instruction jmp __b1
Removing instruction jmp __b2_1
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label __bbegin with __b1
Removing instruction __bbegin:
Removing instruction __b1_from___bbegin:
Removing instruction main_from___b1:
Removing instruction __bend_from___b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __bend:
Removing instruction __b1:
Removing instruction __b2_1:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Updating BasicUpstart to call main directly
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Removing instruction lda #'a'
Succesful ASM optimization Pass5UnnecesaryLoadElimination
Removing instruction __b1:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(void()) main()
(label) main::@1
(label) main::@2_1
(label) main::@return
(const byte*) main::SCREEN = (byte*) 1024
(byte) main::i



FINAL ASSEMBLER
Score: 16

  // File Comments
// Minimal unrolled while() loop
  // 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
    // main::@1
    // SCREEN[i++] = 'a'
    // [5] *((const byte*) main::SCREEN) ← (byte) 'a' -- _deref_pbuc1=vbuc2 
    lda #'a'
    sta SCREEN
    // main::@2_1
    // [6] *((const byte*) main::SCREEN+(byte) 1) ← (byte) 'a' -- _deref_pbuc1=vbuc2 
    sta SCREEN+1
    // main::@return
    // }
    // [7] return 
    rts
}
  // File Data

