Resolved forward reference irq to __interrupt(rom_sys_c64) void irq()
Inlined call vicSelectGfxBank::$0 = call toDd00 vicSelectGfxBank::gfx 

CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  asm { sei  }
  *KERNEL_IRQ = &irq
  asm { cli  }
  to:main::@return
main::@return: scope:[main]  from main
  return 
  to:@return

__interrupt(rom_sys_c64) void irq()
irq: scope:[irq]  from
  *BG_COLOR = WHITE
  *BG_COLOR = BLACK
  to:irq::@return
irq::@return: scope:[irq]  from irq
  return 
  to:@return

void __start()
__start: scope:[__start]  from
  call main 
  to:__start::@1
__start::@1: scope:[__start]  from __start
  to:__start::@return
__start::@return: scope:[__start]  from __start::@1
  return 
  to:@return

SYMBOL TABLE SSA
const nomodify byte* BG_COLOR = (byte*)$d021
const nomodify byte BLACK = 0
const nomodify void()** KERNEL_IRQ = (void()**)$314
const nomodify byte WHITE = 1
void __start()
__interrupt(rom_sys_c64) void irq()
void main()

Simplifying constant pointer cast (byte*) 53281
Simplifying constant pointer cast (void()**) 788
Successful SSA optimization PassNCastSimplification
Removing unused procedure __start
Removing unused procedure block __start
Removing unused procedure block __start::@1
Removing unused procedure block __start::@return
Successful SSA optimization PassNEliminateEmptyStart
CALL GRAPH

Created 0 initial phi equivalence classes
Coalesced down to 0 phi equivalence classes

FINAL CONTROL FLOW GRAPH

__interrupt(rom_sys_c64) void irq()
irq: scope:[irq]  from
  [0] *BG_COLOR = WHITE
  [1] *BG_COLOR = BLACK
  to:irq::@return
irq::@return: scope:[irq]  from irq
  [2] return 
  to:@return

void main()
main: scope:[main]  from
  asm { sei  }
  [4] *KERNEL_IRQ = &irq
  asm { cli  }
  to:main::@return
main::@return: scope:[main]  from main
  [6] return 
  to:@return


VARIABLE REGISTER WEIGHTS
__interrupt(rom_sys_c64) void irq()
void main()

Initial phi equivalence classes
Complete equivalence classes
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [0] *BG_COLOR = WHITE [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [1] *BG_COLOR = BLACK [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [4] *KERNEL_IRQ = &irq [ ] (  [ ] { }  ) always clobbers reg byte a 

REGISTER UPLIFT SCOPES
Uplift Scope [MOS6526_CIA] 
Uplift Scope [MOS6569_VICII] 
Uplift Scope [MOS6581_SID] 
Uplift Scope [main] 
Uplift Scope [irq] 
Uplift Scope [] 

Uplifting [MOS6526_CIA] best 70 combination 
Uplifting [MOS6569_VICII] best 70 combination 
Uplifting [MOS6581_SID] best 70 combination 
Uplifting [main] best 70 combination 
Uplifting [irq] best 70 combination 
Uplifting [] best 70 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// A minimal working IRQ
  // Upstart
  // Commodore 64 PRG executable file
.file [name="irq-kernel-minimal.prg", type="prg", segments="Program"]
.segmentdef Program [segments="Basic, Code, Data"]
.segmentdef Basic [start=$0801]
.segmentdef Code [start=$80d]
.segmentdef Data [startAfter="Code"]
.segment Basic
:BasicUpstart(main)
  // Global Constants & labels
  // The colors of the C64
  .const BLACK = 0
  .const WHITE = 1
  .label BG_COLOR = $d021
  // The vector used when the KERNAL serves IRQ interrupts
  .label KERNEL_IRQ = $314
.segment Code
  // irq
// The Interrupt Handler
irq: {
    // interrupt(isr_rom_sys_c64_entry) -- isr_rom_sys_c64_entry 
    // [0] *BG_COLOR = WHITE -- _deref_pbuc1=vbuc2 
    lda #WHITE
    sta BG_COLOR
    // [1] *BG_COLOR = BLACK -- _deref_pbuc1=vbuc2 
    lda #BLACK
    sta BG_COLOR
    jmp __breturn
    // irq::@return
  __breturn:
    // [2] return 
    // interrupt(isr_rom_sys_c64_exit) -- isr_rom_sys_c64_exit 
    jmp $ea31
}
  // main
// Setup the IRQ routine
main: {
    // asm { sei  }
    sei
    // [4] *KERNEL_IRQ = &irq -- _deref_qprc1=pprc2 
    lda #<irq
    sta KERNEL_IRQ
    lda #>irq
    sta KERNEL_IRQ+1
    // asm { cli  }
    cli
    jmp __breturn
    // main::@return
  __breturn:
    // [6] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __breturn
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction __breturn:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
const nomodify byte* BG_COLOR = (byte*) 53281
const nomodify byte BLACK = 0
const nomodify void()** KERNEL_IRQ = (void()**) 788
const nomodify byte WHITE = 1
__interrupt(rom_sys_c64) void irq()
void main()



FINAL ASSEMBLER
Score: 64

  // File Comments
// A minimal working IRQ
  // Upstart
  // Commodore 64 PRG executable file
.file [name="irq-kernel-minimal.prg", type="prg", segments="Program"]
.segmentdef Program [segments="Basic, Code, Data"]
.segmentdef Basic [start=$0801]
.segmentdef Code [start=$80d]
.segmentdef Data [startAfter="Code"]
.segment Basic
:BasicUpstart(main)
  // Global Constants & labels
  // The colors of the C64
  .const BLACK = 0
  .const WHITE = 1
  .label BG_COLOR = $d021
  // The vector used when the KERNAL serves IRQ interrupts
  .label KERNEL_IRQ = $314
.segment Code
  // irq
// The Interrupt Handler
irq: {
    // interrupt(isr_rom_sys_c64_entry) -- isr_rom_sys_c64_entry 
    // *BG_COLOR = WHITE
    // [0] *BG_COLOR = WHITE -- _deref_pbuc1=vbuc2 
    lda #WHITE
    sta BG_COLOR
    // *BG_COLOR = BLACK
    // [1] *BG_COLOR = BLACK -- _deref_pbuc1=vbuc2 
    lda #BLACK
    sta BG_COLOR
    // irq::@return
    // }
    // [2] return 
    // interrupt(isr_rom_sys_c64_exit) -- isr_rom_sys_c64_exit 
    jmp $ea31
}
  // main
// Setup the IRQ routine
main: {
    // asm
    // asm { sei  }
    sei
    // *KERNEL_IRQ = &irq
    // [4] *KERNEL_IRQ = &irq -- _deref_qprc1=pprc2 
    lda #<irq
    sta KERNEL_IRQ
    lda #>irq
    sta KERNEL_IRQ+1
    // asm
    // asm { cli  }
    cli
    // main::@return
    // }
    // [6] return 
    rts
}
  // File Data