Resolved forward reference irq to interrupt(KERNEL_MIN)(void()) irq()

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  (void()**) KERNEL_IRQ#0 ← ((void()**)) (word/signed word/dword/signed dword) 788
  (byte*) BGCOL#0 ← ((byte*)) (word/dword/signed dword) 53280
  (byte) col#0 ← (byte/signed byte/word/signed word/dword/signed dword) 0
  to:@2
main: scope:[main]  from @2
  (byte) col#16 ← phi( @2/(byte) col#15 )
  (void()*~) main::$0 ← & interrupt(KERNEL_MIN)(void()) irq()
  *((void()**) KERNEL_IRQ#0) ← (void()*~) main::$0
  to:main::@1
main::@1: scope:[main]  from main main::@4 main::@7
  (byte) col#14 ← phi( main/(byte) col#16 main::@4/(byte) col#17 main::@7/(byte) col#1 )
  if(true) goto main::@2
  to:main::@return
main::@2: scope:[main]  from main::@1
  (byte) col#7 ← phi( main::@1/(byte) col#14 )
  (bool~) main::$1 ← (byte) col#7 > (byte/signed byte/word/signed word/dword/signed dword) 10
  (bool~) main::$2 ← ! (bool~) main::$1
  if((bool~) main::$2) goto main::@4
  to:main::@7
main::@4: scope:[main]  from main::@2
  (byte) col#17 ← phi( main::@2/(byte) col#7 )
  to:main::@1
main::@7: scope:[main]  from main::@2
  (byte) col#1 ← (byte/signed byte/word/signed word/dword/signed dword) 0
  to:main::@1
main::@return: scope:[main]  from main::@1
  (byte) col#8 ← phi( main::@1/(byte) col#14 )
  (byte) col#2 ← (byte) col#8
  return 
  to:@return
irq: scope:[irq]  from
  (byte) col#9 ← phi( @2/(byte) col#15 )
  asm { lda$dc0d  }
  *((byte*) BGCOL#0) ← (byte) col#9
  (bool~) irq::$0 ← (byte) col#9 != (byte/signed byte/word/signed word/dword/signed dword) 0
  if((bool~) irq::$0) goto irq::@1
  to:irq::@3
irq::@1: scope:[irq]  from irq
  (byte) col#10 ← phi( irq/(byte) col#9 )
  (byte) col#3 ← ++ (byte) col#10
  to:irq::@return
irq::@3: scope:[irq]  from irq
  (byte) col#11 ← phi( irq/(byte) col#9 )
  (byte) col#4 ← (byte) col#11 + (byte/signed byte/word/signed word/dword/signed dword) 2
  to:irq::@return
irq::@return: scope:[irq]  from irq::@1 irq::@3
  (byte) col#12 ← phi( irq::@1/(byte) col#3 irq::@3/(byte) col#4 )
  (byte) col#5 ← (byte) col#12
  return 
  to:@return
@2: scope:[]  from @begin
  (byte) col#15 ← phi( @begin/(byte) col#0 )
  call main 
  to:@3
@3: scope:[]  from @2
  (byte) col#13 ← phi( @2/(byte) col#2 )
  (byte) col#6 ← (byte) col#13
  to:@end
@end: scope:[]  from @3

SYMBOL TABLE SSA
(label) @2
(label) @3
(label) @begin
(label) @end
(byte*) BGCOL
(byte*) BGCOL#0
(void()**) KERNEL_IRQ
(void()**) KERNEL_IRQ#0
(byte) col
(byte) col#0
(byte) col#1
(byte) col#10
(byte) col#11
(byte) col#12
(byte) col#13
(byte) col#14
(byte) col#15
(byte) col#16
(byte) col#17
(byte) col#2
(byte) col#3
(byte) col#4
(byte) col#5
(byte) col#6
(byte) col#7
(byte) col#8
(byte) col#9
interrupt(KERNEL_MIN)(void()) irq()
(bool~) irq::$0
(label) irq::@1
(label) irq::@3
(label) irq::@return
(void()) main()
(void()*~) main::$0
(bool~) main::$1
(bool~) main::$2
(label) main::@1
(label) main::@2
(label) main::@4
(label) main::@7
(label) main::@return

Inversing boolean not [10] (bool~) main::$2 ← (byte) col#7 <= (byte/signed byte/word/signed word/dword/signed dword) 10 from [9] (bool~) main::$1 ← (byte) col#7 > (byte/signed byte/word/signed word/dword/signed dword) 10
Successful SSA optimization Pass2UnaryNotSimplification
Alias (byte) col#14 = (byte) col#7 (byte) col#17 (byte) col#8 (byte) col#2 
Alias (byte) col#10 = (byte) col#9 (byte) col#11 
Alias (byte) col#12 = (byte) col#5 
Alias (byte) col#0 = (byte) col#15 
Alias (byte) col#13 = (byte) col#6 
Successful SSA optimization Pass2AliasElimination
Self Phi Eliminated (byte) col#14
Successful SSA optimization Pass2SelfPhiElimination
Redundant Phi (byte) col#16 (byte) col#0
Redundant Phi (byte) col#10 (byte) col#0
Redundant Phi (byte) col#13 (byte) col#14
Successful SSA optimization Pass2RedundantPhiElimination
Simple Condition (bool~) main::$2 [11] if((byte) col#14<=(byte/signed byte/word/signed word/dword/signed dword) 10) goto main::@4
Simple Condition (bool~) irq::$0 [21] if((byte) col#0!=(byte/signed byte/word/signed word/dword/signed dword) 0) goto irq::@1
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const void()**) KERNEL_IRQ#0 = ((void()**))788
Constant (const byte*) BGCOL#0 = ((byte*))53280
Constant (const void()*) main::$0 = &irq
Successful SSA optimization Pass2ConstantIdentification
if() condition always true - replacing block destination [3] if(true) goto main::@2
Successful SSA optimization Pass2ConstantIfs
Successful SSA optimization PassNEliminateUnusedVars
Removing unused block main::@return
Successful SSA optimization Pass2EliminateUnusedBlocks
Culled Empty Block (label) main::@4
Culled Empty Block (label) @3
Successful SSA optimization Pass2CullEmptyBlocks
Constant inlined main::$0 = &interrupt(KERNEL_MIN)(void()) irq()
Successful SSA optimization Pass2ConstantInlining
Adding NOP phi() at start of @2
Adding NOP phi() at start of @end
CALL GRAPH
Calls in [] to main:2 

Created 1 initial phi equivalence classes
Coalesced [5] col#18 ← col#0
Coalesced [9] col#19 ← col#1
Coalesced down to 1 phi equivalence classes
Adding NOP phi() at start of @2
Adding NOP phi() at start of @end

FINAL CONTROL FLOW GRAPH
@begin: scope:[]  from
  [0] (byte) col#0 ← (byte/signed byte/word/signed word/dword/signed dword) 0
  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] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq()
  to:main::@1
main::@1: scope:[main]  from main main::@2 main::@7
  [5] (byte) col#14 ← phi( main/(byte) col#0 main::@7/(byte) col#1 )
  to:main::@2
main::@2: scope:[main]  from main::@1
  [6] if((byte) col#14<=(byte/signed byte/word/signed word/dword/signed dword) 10) goto main::@1
  to:main::@7
main::@7: scope:[main]  from main::@2
  [7] (byte) col#1 ← (byte/signed byte/word/signed word/dword/signed dword) 0
  to:main::@1
irq: scope:[irq]  from
  asm { lda$dc0d  }
  [9] *((const byte*) BGCOL#0) ← (byte) col#0
  [10] if((byte) col#0!=(byte/signed byte/word/signed word/dword/signed dword) 0) goto irq::@1
  to:irq::@3
irq::@3: scope:[irq]  from irq
  [11] (byte) col#4 ← (byte) col#0 + (byte/signed byte/word/signed word/dword/signed dword) 2
  to:irq::@return
irq::@return: scope:[irq]  from irq::@1 irq::@3
  [12] return 
  to:@return
irq::@1: scope:[irq]  from irq
  [13] (byte) col#3 ← ++ (byte) col#0
  to:irq::@return


VARIABLE REGISTER WEIGHTS
(byte*) BGCOL
(void()**) KERNEL_IRQ
(byte) col
(byte) col#0 1.9999999999999998
(byte) col#1 22.0
(byte) col#14 114.0
(byte) col#3 20.0
(byte) col#4 20.0
interrupt(KERNEL_MIN)(void()) irq()
(void()) main()

Initial phi equivalence classes
[ col#14 col#0 col#1 ]
Added variable col#4 to zero page equivalence class [ col#4 ]
Added variable col#3 to zero page equivalence class [ col#3 ]
Complete equivalence classes
[ col#14 col#0 col#1 ]
[ col#4 ]
[ col#3 ]
Allocated zp ZP_BYTE:2 [ col#14 col#0 col#1 ]
Allocated zp ZP_BYTE:3 [ col#4 ]
Allocated zp ZP_BYTE:4 [ col#3 ]

INITIAL ASM
//SEG0 File Comments
// Tests that volatile variables can be both read & written inside & outside interrupts
// Currently fails because the modification is optimized away
//SEG1 Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
//SEG2 Global Constants & labels
  .label KERNEL_IRQ = $314
  .label BGCOL = $d020
  .label col = 2
  .label col_3 = 4
  .label col_4 = 3
//SEG3 @begin
bbegin:
//SEG4 [0] (byte) col#0 ← (byte/signed byte/word/signed word/dword/signed dword) 0 -- vbuz1=vbuc1 
  lda #0
  sta col
//SEG5 [1] phi from @begin to @2 [phi:@begin->@2]
b2_from_bbegin:
  jmp b2
//SEG6 @2
b2:
//SEG7 [2] call main 
  jsr main
//SEG8 [3] phi from @2 to @end [phi:@2->@end]
bend_from_b2:
  jmp bend
//SEG9 @end
bend:
//SEG10 main
main: {
  //SEG11 [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() -- _deref_pptc1=pprc2 
    lda #<irq
    sta KERNEL_IRQ
    lda #>irq
    sta KERNEL_IRQ+1
  //SEG12 [5] phi from main main::@7 to main::@1 [phi:main/main::@7->main::@1]
  b1_from_main:
  b1_from_b7:
  //SEG13 [5] phi (byte) col#14 = (byte) col#0 [phi:main/main::@7->main::@1#0] -- register_copy 
    jmp b1
  //SEG14 [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  b1_from_b2:
    jmp b1
  //SEG15 main::@1
  b1:
    jmp b2
  //SEG16 main::@2
  b2:
  //SEG17 [6] if((byte) col#14<=(byte/signed byte/word/signed word/dword/signed dword) 10) goto main::@1 -- vbuz1_le_vbuc1_then_la1 
    lda #$a
    cmp col
    bcs b1_from_b2
    jmp b7
  //SEG18 main::@7
  b7:
  //SEG19 [7] (byte) col#1 ← (byte/signed byte/word/signed word/dword/signed dword) 0 -- vbuz1=vbuc1 
    lda #0
    sta col
    jmp b1_from_b7
}
//SEG20 irq
irq: {
  //SEG21 entry interrupt(KERNEL_MIN)
  //SEG22 asm { lda$dc0d  }
    lda $dc0d
  //SEG23 [9] *((const byte*) BGCOL#0) ← (byte) col#0 -- _deref_pbuc1=vbuz1 
    lda col
    sta BGCOL
  //SEG24 [10] if((byte) col#0!=(byte/signed byte/word/signed word/dword/signed dword) 0) goto irq::@1 -- vbuz1_neq_0_then_la1 
    lda col
    cmp #0
    bne b1
    jmp b3
  //SEG25 irq::@3
  b3:
  //SEG26 [11] (byte) col#4 ← (byte) col#0 + (byte/signed byte/word/signed word/dword/signed dword) 2 -- vbuz1=vbuz2_plus_2 
    lda col
    clc
    adc #2
    sta col_4
    jmp breturn
  //SEG27 irq::@return
  breturn:
  //SEG28 [12] return  - exit interrupt(KERNEL_MIN)
    jmp $ea81
  //SEG29 irq::@1
  b1:
  //SEG30 [13] (byte) col#3 ← ++ (byte) col#0 -- vbuz1=_inc_vbuz2 
    ldy col
    iny
    sty col_3
    jmp breturn
}

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [0] (byte) col#0 ← (byte/signed byte/word/signed word/dword/signed dword) 0 [ col#0 ] ( ) always clobbers reg byte a 
Statement [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() [ col#0 ] ( main:2 [ col#0 ] ) always clobbers reg byte a 
Statement [6] if((byte) col#14<=(byte/signed byte/word/signed word/dword/signed dword) 10) goto main::@1 [ ] ( main:2 [ ] ) always clobbers reg byte a 
Statement [7] (byte) col#1 ← (byte/signed byte/word/signed word/dword/signed dword) 0 [ col#1 ] ( main:2 [ col#1 ] ) always clobbers reg byte a 
Statement asm { lda$dc0d  } always clobbers reg byte a 
Statement [9] *((const byte*) BGCOL#0) ← (byte) col#0 [ col#0 ] (  [ col#0 ] ) always clobbers reg byte a 
Statement [10] if((byte) col#0!=(byte/signed byte/word/signed word/dword/signed dword) 0) goto irq::@1 [ col#0 ] (  [ col#0 ] ) always clobbers reg byte a 
Statement [11] (byte) col#4 ← (byte) col#0 + (byte/signed byte/word/signed word/dword/signed dword) 2 [ ] (  [ ] ) always clobbers reg byte a 
Statement [13] (byte) col#3 ← ++ (byte) col#0 [ ] (  [ ] ) always clobbers reg byte y 
Potential registers zp ZP_BYTE:2 [ col#14 col#0 col#1 ] : zp ZP_BYTE:2 , 
Potential registers zp ZP_BYTE:3 [ col#4 ] : zp ZP_BYTE:3 , 
Potential registers zp ZP_BYTE:4 [ col#3 ] : zp ZP_BYTE:4 , 

REGISTER UPLIFT SCOPES
Uplift Scope [] 138: zp ZP_BYTE:2 [ col#14 col#0 col#1 ] 20: zp ZP_BYTE:3 [ col#4 ] 20: zp ZP_BYTE:4 [ col#3 ] 
Uplift Scope [main] 
Uplift Scope [irq] 

Uplifting [] best 1837 combination zp ZP_BYTE:2 [ col#14 col#0 col#1 ] zp ZP_BYTE:3 [ col#4 ] zp ZP_BYTE:4 [ col#3 ] 
Uplifting [main] best 1837 combination 
Uplifting [irq] best 1837 combination 
Attempting to uplift remaining variables inzp ZP_BYTE:2 [ col#14 col#0 col#1 ]
Uplifting [] best 1837 combination zp ZP_BYTE:2 [ col#14 col#0 col#1 ] 
Attempting to uplift remaining variables inzp ZP_BYTE:3 [ col#4 ]
Uplifting [] best 1837 combination zp ZP_BYTE:3 [ col#4 ] 
Attempting to uplift remaining variables inzp ZP_BYTE:4 [ col#3 ]
Uplifting [] best 1837 combination zp ZP_BYTE:4 [ col#3 ] 
Coalescing zero page register with common assignment [ zp ZP_BYTE:2 [ col#14 col#0 col#1 ] ] with [ zp ZP_BYTE:3 [ col#4 ] ] - score: 1
Coalescing zero page register with common assignment [ zp ZP_BYTE:2 [ col#14 col#0 col#1 col#4 ] ] with [ zp ZP_BYTE:4 [ col#3 ] ] - score: 1

ASSEMBLER BEFORE OPTIMIZATION
//SEG0 File Comments
// Tests that volatile variables can be both read & written inside & outside interrupts
// Currently fails because the modification is optimized away
//SEG1 Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
//SEG2 Global Constants & labels
  .label KERNEL_IRQ = $314
  .label BGCOL = $d020
  .label col = 2
//SEG3 @begin
bbegin:
//SEG4 [0] (byte) col#0 ← (byte/signed byte/word/signed word/dword/signed dword) 0 -- vbuz1=vbuc1 
  lda #0
  sta col
//SEG5 [1] phi from @begin to @2 [phi:@begin->@2]
b2_from_bbegin:
  jmp b2
//SEG6 @2
b2:
//SEG7 [2] call main 
  jsr main
//SEG8 [3] phi from @2 to @end [phi:@2->@end]
bend_from_b2:
  jmp bend
//SEG9 @end
bend:
//SEG10 main
main: {
  //SEG11 [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() -- _deref_pptc1=pprc2 
    lda #<irq
    sta KERNEL_IRQ
    lda #>irq
    sta KERNEL_IRQ+1
  //SEG12 [5] phi from main main::@7 to main::@1 [phi:main/main::@7->main::@1]
  b1_from_main:
  b1_from_b7:
  //SEG13 [5] phi (byte) col#14 = (byte) col#0 [phi:main/main::@7->main::@1#0] -- register_copy 
    jmp b1
  //SEG14 [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  b1_from_b2:
    jmp b1
  //SEG15 main::@1
  b1:
    jmp b2
  //SEG16 main::@2
  b2:
  //SEG17 [6] if((byte) col#14<=(byte/signed byte/word/signed word/dword/signed dword) 10) goto main::@1 -- vbuz1_le_vbuc1_then_la1 
    lda #$a
    cmp col
    bcs b1_from_b2
    jmp b7
  //SEG18 main::@7
  b7:
  //SEG19 [7] (byte) col#1 ← (byte/signed byte/word/signed word/dword/signed dword) 0 -- vbuz1=vbuc1 
    lda #0
    sta col
    jmp b1_from_b7
}
//SEG20 irq
irq: {
  //SEG21 entry interrupt(KERNEL_MIN)
  //SEG22 asm { lda$dc0d  }
    lda $dc0d
  //SEG23 [9] *((const byte*) BGCOL#0) ← (byte) col#0 -- _deref_pbuc1=vbuz1 
    lda col
    sta BGCOL
  //SEG24 [10] if((byte) col#0!=(byte/signed byte/word/signed word/dword/signed dword) 0) goto irq::@1 -- vbuz1_neq_0_then_la1 
    lda col
    cmp #0
    bne b1
    jmp b3
  //SEG25 irq::@3
  b3:
  //SEG26 [11] (byte) col#4 ← (byte) col#0 + (byte/signed byte/word/signed word/dword/signed dword) 2 -- vbuz1=vbuz1_plus_2 
    lda col
    clc
    adc #2
    sta col
    jmp breturn
  //SEG27 irq::@return
  breturn:
  //SEG28 [12] return  - exit interrupt(KERNEL_MIN)
    jmp $ea81
  //SEG29 irq::@1
  b1:
  //SEG30 [13] (byte) col#3 ← ++ (byte) col#0 -- vbuz1=_inc_vbuz1 
    inc col
    jmp breturn
}

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp b2
Removing instruction jmp bend
Removing instruction jmp b1
Removing instruction jmp b2
Removing instruction jmp b7
Removing instruction jmp b3
Removing instruction jmp breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label b1 with b2
Replacing label b1_from_b2 with b2
Removing instruction b2_from_bbegin:
Removing instruction bend_from_b2:
Removing instruction b1_from_main:
Removing instruction b1_from_b2:
Removing instruction b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction b2:
Removing instruction bend:
Removing instruction b7:
Removing instruction b3:
Succesful ASM optimization Pass5UnusedLabelElimination
Skipping double jump to b2 in jmp b1_from_b7
Skipping double jump to $ea81 in jmp breturn
Succesful ASM optimization Pass5DoubleJumpElimination
Relabelling long label b1_from_b7 to b1
Succesful ASM optimization Pass5RelabelLongLabels
Removing instruction jmp b2
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction lda col
Succesful ASM optimization Pass5UnnecesaryLoadElimination
Removing instruction b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction breturn:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @2
(label) @begin
(label) @end
(byte*) BGCOL
(const byte*) BGCOL#0 BGCOL = ((byte*))(word/dword/signed dword) 53280
(void()**) KERNEL_IRQ
(const void()**) KERNEL_IRQ#0 KERNEL_IRQ = ((void()**))(word/signed word/dword/signed dword) 788
(byte) col
(byte) col#0 col zp ZP_BYTE:2 1.9999999999999998
(byte) col#1 col zp ZP_BYTE:2 22.0
(byte) col#14 col zp ZP_BYTE:2 114.0
(byte) col#3 col zp ZP_BYTE:2 20.0
(byte) col#4 col zp ZP_BYTE:2 20.0
interrupt(KERNEL_MIN)(void()) irq()
(label) irq::@1
(label) irq::@3
(label) irq::@return
(void()) main()
(label) main::@1
(label) main::@2
(label) main::@7

zp ZP_BYTE:2 [ col#14 col#0 col#1 col#4 col#3 ]


FINAL ASSEMBLER
Score: 889

//SEG0 File Comments
// Tests that volatile variables can be both read & written inside & outside interrupts
// Currently fails because the modification is optimized away
//SEG1 Basic Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
//SEG2 Global Constants & labels
  .label KERNEL_IRQ = $314
  .label BGCOL = $d020
  .label col = 2
//SEG3 @begin
bbegin:
//SEG4 [0] (byte) col#0 ← (byte/signed byte/word/signed word/dword/signed dword) 0 -- vbuz1=vbuc1 
  lda #0
  sta col
//SEG5 [1] phi from @begin to @2 [phi:@begin->@2]
//SEG6 @2
//SEG7 [2] call main 
  jsr main
//SEG8 [3] phi from @2 to @end [phi:@2->@end]
//SEG9 @end
//SEG10 main
main: {
  //SEG11 [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() -- _deref_pptc1=pprc2 
    lda #<irq
    sta KERNEL_IRQ
    lda #>irq
    sta KERNEL_IRQ+1
  //SEG12 [5] phi from main main::@7 to main::@1 [phi:main/main::@7->main::@1]
  //SEG13 [5] phi (byte) col#14 = (byte) col#0 [phi:main/main::@7->main::@1#0] -- register_copy 
  //SEG14 [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
  //SEG15 main::@1
  //SEG16 main::@2
  b2:
  //SEG17 [6] if((byte) col#14<=(byte/signed byte/word/signed word/dword/signed dword) 10) goto main::@1 -- vbuz1_le_vbuc1_then_la1 
    lda #$a
    cmp col
    bcs b2
  //SEG18 main::@7
  //SEG19 [7] (byte) col#1 ← (byte/signed byte/word/signed word/dword/signed dword) 0 -- vbuz1=vbuc1 
    lda #0
    sta col
    jmp b2
}
//SEG20 irq
irq: {
  //SEG21 entry interrupt(KERNEL_MIN)
  //SEG22 asm { lda$dc0d  }
    lda $dc0d
  //SEG23 [9] *((const byte*) BGCOL#0) ← (byte) col#0 -- _deref_pbuc1=vbuz1 
    lda col
    sta BGCOL
  //SEG24 [10] if((byte) col#0!=(byte/signed byte/word/signed word/dword/signed dword) 0) goto irq::@1 -- vbuz1_neq_0_then_la1 
    lda col
    cmp #0
    bne b1
  //SEG25 irq::@3
  //SEG26 [11] (byte) col#4 ← (byte) col#0 + (byte/signed byte/word/signed word/dword/signed dword) 2 -- vbuz1=vbuz1_plus_2 
    clc
    adc #2
    sta col
  //SEG27 irq::@return
  //SEG28 [12] return  - exit interrupt(KERNEL_MIN)
    jmp $ea81
  //SEG29 irq::@1
  b1:
  //SEG30 [13] (byte) col#3 ← ++ (byte) col#0 -- vbuz1=_inc_vbuz1 
    inc col
    jmp $ea81
}

