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

CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start
  asm { sei  }
  *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK
  *PROCPORT = PROCPORT_RAM_IO
  *((char *)CIA1+OFFSET_STRUCT_MOS6526_CIA_INTERRUPT) = CIA_INTERRUPT_CLEAR
  *VICII_CONTROL1 = *VICII_CONTROL1 | $80
  *RASTER = 0
  *IRQ_ENABLE = IRQ_RASTER
  *HARDWARE_IRQ = &irq
  asm { cli  }
  to:main::@1
main::@1: scope:[main]  from main main::@2
  if(true) goto main::@2
  to:main::@return
main::@2: scope:[main]  from main::@1
  *BORDER_COLOR = ++ *BORDER_COLOR
  to:main::@1
main::@return: scope:[main]  from main::@1
  return 
  to:@return

__interrupt(hardware_clobber) void irq()
irq: scope:[irq]  from
  call do_irq
  to:irq::@1
irq::@1: scope:[irq]  from irq
  to:irq::@return
irq::@return: scope:[irq]  from irq::@1
  return 
  to:@return

void do_irq()
do_irq: scope:[do_irq]  from irq
  *BG_COLOR = WHITE
  *BG_COLOR = BLACK
  *IRQ_STATUS = IRQ_RASTER
  to:do_irq::@return
do_irq::@return: scope:[do_irq]  from do_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
__constant char * const BG_COLOR = (char *)$d021
__constant const char BLACK = 0
__constant char * const BORDER_COLOR = (char *)$d020
__constant struct MOS6526_CIA * const CIA1 = (struct MOS6526_CIA *)$dc00
__constant const char CIA_INTERRUPT_CLEAR = $7f
__constant void (** const HARDWARE_IRQ)() = (void (**)())$fffe
__constant char * const IRQ_ENABLE = (char *)$d01a
__constant const char IRQ_RASTER = 1
__constant char * const IRQ_STATUS = (char *)$d019
__constant char OFFSET_STRUCT_MOS6526_CIA_INTERRUPT = $d
__constant char * const PROCPORT = (char *)1
__constant char * const PROCPORT_DDR = (char *)0
__constant const char PROCPORT_DDR_MEMORY_MASK = 7
__constant const char PROCPORT_RAM_IO = 5
__constant char * const RASTER = (char *)$d012
__constant char * const VICII_CONTROL1 = (char *)$d011
__constant const char WHITE = 1
void __start()
void do_irq()
__interrupt(hardware_clobber) void irq()
void main()

Adding number conversion cast (unumber) $80 in *VICII_CONTROL1 = *VICII_CONTROL1 | $80
Adding number conversion cast (unumber) 0 in *RASTER = 0
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast *RASTER = (unumber)0
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (char *) 53266
Simplifying constant pointer cast (char *) 53280
Simplifying constant pointer cast (char *) 53281
Simplifying constant pointer cast (char *) 53265
Simplifying constant pointer cast (char *) 53273
Simplifying constant pointer cast (char *) 53274
Simplifying constant pointer cast (char *) 0
Simplifying constant pointer cast (char *) 1
Simplifying constant pointer cast (struct MOS6526_CIA *) 56320
Simplifying constant pointer cast (void (**)()) 65534
Simplifying constant integer cast $80
Simplifying constant integer cast 0
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (char) $80
Finalized unsigned number type (char) 0
Successful SSA optimization PassNFinalizeNumberTypeConversions
if() condition always true - replacing block destination [9] if(true) goto main::@2
Successful SSA optimization Pass2ConstantIfs
Removing unused block main::@return
Successful SSA optimization Pass2EliminateUnusedBlocks
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
Adding NOP phi() at start of irq
Adding NOP phi() at start of irq::@1
Adding NOP phi() at start of main::@1
CALL GRAPH
Calls in [irq] to do_irq:1 

Created 0 initial phi equivalence classes
Coalesced down to 0 phi equivalence classes
Culled Empty Block label irq::@1
Culled Empty Block label main::@1
Renumbering block main::@2 to main::@1
Adding NOP phi() at start of irq

FINAL CONTROL FLOW GRAPH

__interrupt(hardware_clobber) void irq()
irq: scope:[irq]  from
  [0] phi()
  [1] call do_irq
  to:irq::@return
irq::@return: scope:[irq]  from irq
  [2] return 
  to:@return

void main()
main: scope:[main]  from
  asm { sei  }
  [4] *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK
  [5] *PROCPORT = PROCPORT_RAM_IO
  [6] *((char *)CIA1+OFFSET_STRUCT_MOS6526_CIA_INTERRUPT) = CIA_INTERRUPT_CLEAR
  [7] *VICII_CONTROL1 = *VICII_CONTROL1 | $80
  [8] *RASTER = 0
  [9] *IRQ_ENABLE = IRQ_RASTER
  [10] *HARDWARE_IRQ = &irq
  asm { cli  }
  to:main::@1
main::@1: scope:[main]  from main main::@1
  [12] *BORDER_COLOR = ++ *BORDER_COLOR
  to:main::@1

void do_irq()
do_irq: scope:[do_irq]  from irq
  [13] *BG_COLOR = WHITE
  [14] *BG_COLOR = BLACK
  [15] *IRQ_STATUS = IRQ_RASTER
  to:do_irq::@return
do_irq::@return: scope:[do_irq]  from do_irq
  [16] return 
  to:@return


VARIABLE REGISTER WEIGHTS
void do_irq()
__interrupt(hardware_clobber) void irq()
void main()

Initial phi equivalence classes
Complete equivalence classes
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [2] return  [ ] (  [ ] { }  ) always clobbers reg byte a reg byte x reg byte y 
Statement [4] *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [5] *PROCPORT = PROCPORT_RAM_IO [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [6] *((char *)CIA1+OFFSET_STRUCT_MOS6526_CIA_INTERRUPT) = CIA_INTERRUPT_CLEAR [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [7] *VICII_CONTROL1 = *VICII_CONTROL1 | $80 [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [8] *RASTER = 0 [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [9] *IRQ_ENABLE = IRQ_RASTER [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [10] *HARDWARE_IRQ = &irq [ ] (  [ ] { }  ) always clobbers reg byte a 
Statement [13] *BG_COLOR = WHITE [ ] ( do_irq:1 [ ] { }  ) always clobbers reg byte a 
Statement [14] *BG_COLOR = BLACK [ ] ( do_irq:1 [ ] { }  ) always clobbers reg byte a 
Statement [15] *IRQ_STATUS = IRQ_RASTER [ ] ( do_irq:1 [ ] { }  ) 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 [do_irq] 
Uplift Scope [] 

Uplifting [MOS6526_CIA] best 425 combination 
Uplifting [MOS6569_VICII] best 425 combination 
Uplifting [MOS6581_SID] best 425 combination 
Uplifting [main] best 425 combination 
Uplifting [irq] best 425 combination 
Uplifting [do_irq] best 425 combination 
Uplifting [] best 425 combination 
Interrupt procedure irq clobbers AnzPS

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// A minimal working raster hardware IRQ with clobber-based register savings
/// @file
/// Commodore 64 Registers and Constants
/// @file
/// The MOS 6526 Complex Interface Adapter (CIA)
///
/// http://archive.6502.org/datasheets/mos_6526_cia_recreated.pdf
  // Upstart
  // Commodore 64 PRG executable file
.file [name="irq-hardware-clobber-jsr.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
  /// Value that disables all CIA interrupts when stored to the CIA Interrupt registers
  .const CIA_INTERRUPT_CLEAR = $7f
  /// VICII IRQ Status/Enable Raster
  // @see #IRQ_ENABLE #IRQ_STATUS
  ///  0 | RST| Reaching a certain raster line. The line is specified by writing
  ///    |    | to register 0xd012 and bit 7 of $d011 and internally stored by
  ///    |    | the VIC for the raster compare. The test for reaching the
  ///    |    | interrupt raster line is done in cycle 0 of every line (for line
  ///    |    | 0, in cycle 1).
  .const IRQ_RASTER = 1
  /// Mask for PROCESSOR_PORT_DDR which allows only memory configuration to be written
  .const PROCPORT_DDR_MEMORY_MASK = 7
  /// RAM in 0xA000, 0xE000 I/O in 0xD000
  .const PROCPORT_RAM_IO = 5
  /// The colors of the C64
  .const BLACK = 0
  .const WHITE = 1
  .const OFFSET_STRUCT_MOS6526_CIA_INTERRUPT = $d
  /// $D012 RASTER Raster counter
  .label RASTER = $d012
  /// $D020 Border Color
  .label BORDER_COLOR = $d020
  /// $D021 Background Color 0
  .label BG_COLOR = $d021
  /// $D011 Control Register #1
  /// - Bit#0-#2: YSCROLL Screen Soft Scroll Vertical
  /// - Bit#3: RSEL Switch betweem 25 or 24 visible rows
  ///          RSEL|  Display window height   | First line  | Last line
  ///          ----+--------------------------+-------------+----------
  ///            0 | 24 text lines/192 pixels |   55 ($37)  | 246 ($f6)
  ///            1 | 25 text lines/200 pixels |   51 ($33)  | 250 ($fa)
  /// - Bit#4: DEN Switch VIC-II output on/off
  /// - Bit#5: BMM Turn Bitmap Mode on/off
  /// - Bit#6: ECM Turn Extended Color Mode on/off
  /// - Bit#7: RST8 9th Bit for $D012 Rasterline counter
  /// Initial Value: %10011011
  .label VICII_CONTROL1 = $d011
  /// VIC II IRQ Status Register
  .label IRQ_STATUS = $d019
  /// VIC II IRQ Enable Register
  .label IRQ_ENABLE = $d01a
  /// Processor port data direction register
  .label PROCPORT_DDR = 0
  /// Processor Port Register controlling RAM/ROM configuration and the datasette
  .label PROCPORT = 1
  /// The CIA#1: keyboard matrix, joystick #1/#2
  .label CIA1 = $dc00
  /// The vector used when the HARDWARE serves IRQ interrupts
  .label HARDWARE_IRQ = $fffe
.segment Code
  // irq
// Interrupt Routine
irq: {
    // interrupt(isr_hardware_clobber_entry) -- isr_hardware_all_entry 
    sta rega+1
    // [1] call do_irq
    jsr do_irq
    jmp __breturn
    // irq::@return
  __breturn:
    // [2] return 
    // interrupt(isr_hardware_clobber_exit) -- isr_hardware_all_exit 
  rega:
    lda #0
    rti
}
  // main
main: {
    // asm { sei  }
    sei
    // [4] *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK -- _deref_pbuc1=vbuc2 
    // Disable kernal & basic
    lda #PROCPORT_DDR_MEMORY_MASK
    sta PROCPORT_DDR
    // [5] *PROCPORT = PROCPORT_RAM_IO -- _deref_pbuc1=vbuc2 
    lda #PROCPORT_RAM_IO
    sta PROCPORT
    // [6] *((char *)CIA1+OFFSET_STRUCT_MOS6526_CIA_INTERRUPT) = CIA_INTERRUPT_CLEAR -- _deref_pbuc1=vbuc2 
    // Disable CIA 1 Timer IRQ
    lda #CIA_INTERRUPT_CLEAR
    sta CIA1+OFFSET_STRUCT_MOS6526_CIA_INTERRUPT
    // [7] *VICII_CONTROL1 = *VICII_CONTROL1 | $80 -- _deref_pbuc1=_deref_pbuc1_bor_vbuc2 
    // Set raster line to $100
    lda #$80
    ora VICII_CONTROL1
    sta VICII_CONTROL1
    // [8] *RASTER = 0 -- _deref_pbuc1=vbuc2 
    lda #0
    sta RASTER
    // [9] *IRQ_ENABLE = IRQ_RASTER -- _deref_pbuc1=vbuc2 
    // Enable Raster Interrupt
    lda #IRQ_RASTER
    sta IRQ_ENABLE
    // [10] *HARDWARE_IRQ = &irq -- _deref_qprc1=pprc2 
    // Set the IRQ routine
    lda #<irq
    sta HARDWARE_IRQ
    lda #>irq
    sta HARDWARE_IRQ+1
    // asm { cli  }
    cli
    jmp __b1
    // main::@1
  __b1:
    // [12] *BORDER_COLOR = ++ *BORDER_COLOR -- _deref_pbuc1=_inc__deref_pbuc1 
    inc BORDER_COLOR
    jmp __b1
}
  // do_irq
do_irq: {
    // [13] *BG_COLOR = WHITE -- _deref_pbuc1=vbuc2 
    lda #WHITE
    sta BG_COLOR
    // [14] *BG_COLOR = BLACK -- _deref_pbuc1=vbuc2 
    lda #BLACK
    sta BG_COLOR
    // [15] *IRQ_STATUS = IRQ_RASTER -- _deref_pbuc1=vbuc2 
    // Acknowledge the IRQ
    lda #IRQ_RASTER
    sta IRQ_STATUS
    jmp __breturn
    // do_irq::@return
  __breturn:
    // [16] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __breturn
Removing instruction jmp __b1
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction __breturn:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
__constant char * const BG_COLOR = (char *) 53281
__constant const char BLACK = 0
__constant char * const BORDER_COLOR = (char *) 53280
__constant struct MOS6526_CIA * const CIA1 = (struct MOS6526_CIA *) 56320
__constant const char CIA_INTERRUPT_CLEAR = $7f
__constant void (** const HARDWARE_IRQ)() = (void (**)()) 65534
__constant char * const IRQ_ENABLE = (char *) 53274
__constant const char IRQ_RASTER = 1
__constant char * const IRQ_STATUS = (char *) 53273
__constant char OFFSET_STRUCT_MOS6526_CIA_INTERRUPT = $d
__constant char * const PROCPORT = (char *) 1
__constant char * const PROCPORT_DDR = (char *) 0
__constant const char PROCPORT_DDR_MEMORY_MASK = 7
__constant const char PROCPORT_RAM_IO = 5
__constant char * const RASTER = (char *) 53266
__constant char * const VICII_CONTROL1 = (char *) 53265
__constant const char WHITE = 1
void do_irq()
__interrupt(hardware_clobber) void irq()
void main()



FINAL ASSEMBLER
Score: 296

  // File Comments
// A minimal working raster hardware IRQ with clobber-based register savings
/// @file
/// Commodore 64 Registers and Constants
/// @file
/// The MOS 6526 Complex Interface Adapter (CIA)
///
/// http://archive.6502.org/datasheets/mos_6526_cia_recreated.pdf
  // Upstart
  // Commodore 64 PRG executable file
.file [name="irq-hardware-clobber-jsr.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
  /// Value that disables all CIA interrupts when stored to the CIA Interrupt registers
  .const CIA_INTERRUPT_CLEAR = $7f
  /// VICII IRQ Status/Enable Raster
  // @see #IRQ_ENABLE #IRQ_STATUS
  ///  0 | RST| Reaching a certain raster line. The line is specified by writing
  ///    |    | to register 0xd012 and bit 7 of $d011 and internally stored by
  ///    |    | the VIC for the raster compare. The test for reaching the
  ///    |    | interrupt raster line is done in cycle 0 of every line (for line
  ///    |    | 0, in cycle 1).
  .const IRQ_RASTER = 1
  /// Mask for PROCESSOR_PORT_DDR which allows only memory configuration to be written
  .const PROCPORT_DDR_MEMORY_MASK = 7
  /// RAM in 0xA000, 0xE000 I/O in 0xD000
  .const PROCPORT_RAM_IO = 5
  /// The colors of the C64
  .const BLACK = 0
  .const WHITE = 1
  .const OFFSET_STRUCT_MOS6526_CIA_INTERRUPT = $d
  /// $D012 RASTER Raster counter
  .label RASTER = $d012
  /// $D020 Border Color
  .label BORDER_COLOR = $d020
  /// $D021 Background Color 0
  .label BG_COLOR = $d021
  /// $D011 Control Register #1
  /// - Bit#0-#2: YSCROLL Screen Soft Scroll Vertical
  /// - Bit#3: RSEL Switch betweem 25 or 24 visible rows
  ///          RSEL|  Display window height   | First line  | Last line
  ///          ----+--------------------------+-------------+----------
  ///            0 | 24 text lines/192 pixels |   55 ($37)  | 246 ($f6)
  ///            1 | 25 text lines/200 pixels |   51 ($33)  | 250 ($fa)
  /// - Bit#4: DEN Switch VIC-II output on/off
  /// - Bit#5: BMM Turn Bitmap Mode on/off
  /// - Bit#6: ECM Turn Extended Color Mode on/off
  /// - Bit#7: RST8 9th Bit for $D012 Rasterline counter
  /// Initial Value: %10011011
  .label VICII_CONTROL1 = $d011
  /// VIC II IRQ Status Register
  .label IRQ_STATUS = $d019
  /// VIC II IRQ Enable Register
  .label IRQ_ENABLE = $d01a
  /// Processor port data direction register
  .label PROCPORT_DDR = 0
  /// Processor Port Register controlling RAM/ROM configuration and the datasette
  .label PROCPORT = 1
  /// The CIA#1: keyboard matrix, joystick #1/#2
  .label CIA1 = $dc00
  /// The vector used when the HARDWARE serves IRQ interrupts
  .label HARDWARE_IRQ = $fffe
.segment Code
  // irq
// Interrupt Routine
irq: {
    // interrupt(isr_hardware_clobber_entry) -- isr_hardware_all_entry 
    sta rega+1
    // do_irq()
    // [1] call do_irq
    jsr do_irq
    // irq::@return
    // }
    // [2] return 
    // interrupt(isr_hardware_clobber_exit) -- isr_hardware_all_exit 
  rega:
    lda #0
    rti
}
  // main
main: {
    // asm
    // asm { sei  }
    sei
    // *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK
    // [4] *PROCPORT_DDR = PROCPORT_DDR_MEMORY_MASK -- _deref_pbuc1=vbuc2 
    // Disable kernal & basic
    lda #PROCPORT_DDR_MEMORY_MASK
    sta PROCPORT_DDR
    // *PROCPORT = PROCPORT_RAM_IO
    // [5] *PROCPORT = PROCPORT_RAM_IO -- _deref_pbuc1=vbuc2 
    lda #PROCPORT_RAM_IO
    sta PROCPORT
    // CIA1->INTERRUPT = CIA_INTERRUPT_CLEAR
    // [6] *((char *)CIA1+OFFSET_STRUCT_MOS6526_CIA_INTERRUPT) = CIA_INTERRUPT_CLEAR -- _deref_pbuc1=vbuc2 
    // Disable CIA 1 Timer IRQ
    lda #CIA_INTERRUPT_CLEAR
    sta CIA1+OFFSET_STRUCT_MOS6526_CIA_INTERRUPT
    // *VICII_CONTROL1 |=$80
    // [7] *VICII_CONTROL1 = *VICII_CONTROL1 | $80 -- _deref_pbuc1=_deref_pbuc1_bor_vbuc2 
    // Set raster line to $100
    lda #$80
    ora VICII_CONTROL1
    sta VICII_CONTROL1
    // *RASTER = $00
    // [8] *RASTER = 0 -- _deref_pbuc1=vbuc2 
    lda #0
    sta RASTER
    // *IRQ_ENABLE = IRQ_RASTER
    // [9] *IRQ_ENABLE = IRQ_RASTER -- _deref_pbuc1=vbuc2 
    // Enable Raster Interrupt
    lda #IRQ_RASTER
    sta IRQ_ENABLE
    // *HARDWARE_IRQ = &irq
    // [10] *HARDWARE_IRQ = &irq -- _deref_qprc1=pprc2 
    // Set the IRQ routine
    lda #<irq
    sta HARDWARE_IRQ
    lda #>irq
    sta HARDWARE_IRQ+1
    // asm
    // asm { cli  }
    cli
    // main::@1
  __b1:
    // (*BORDER_COLOR)++;
    // [12] *BORDER_COLOR = ++ *BORDER_COLOR -- _deref_pbuc1=_inc__deref_pbuc1 
    inc BORDER_COLOR
    jmp __b1
}
  // do_irq
do_irq: {
    // *BG_COLOR = WHITE
    // [13] *BG_COLOR = WHITE -- _deref_pbuc1=vbuc2 
    lda #WHITE
    sta BG_COLOR
    // *BG_COLOR = BLACK
    // [14] *BG_COLOR = BLACK -- _deref_pbuc1=vbuc2 
    lda #BLACK
    sta BG_COLOR
    // *IRQ_STATUS = IRQ_RASTER
    // [15] *IRQ_STATUS = IRQ_RASTER -- _deref_pbuc1=vbuc2 
    // Acknowledge the IRQ
    lda #IRQ_RASTER
    sta IRQ_STATUS
    // do_irq::@return
    // }
    // [16] return 
    rts
}
  // File Data

