@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] (byte) irq_raster_next#0 ← (byte) 0
  to:@2
@2: scope:[]  from @1
  [2] phi()
  [3] call main 
  to:@end
@end: scope:[]  from @2
  [4] phi()
main: scope:[main]  from @2
  [5] *((const void()**) KERNEL_IRQ#0) ← &interrupt(HARDWARE_CLOBBER)(void()) irq()
  to:main::@return
main::@return: scope:[main]  from main
  [6] return 
  to:@return
irq: scope:[irq]  from
  [7] *((const byte*) BORDERCOL#0) ← (const byte) DARK_GREY#0
  [8] (byte) irq_raster_next#1 ← (byte) irq_raster_next#0 + (byte) $15
  [9] (byte) irq::raster_next#0 ← (byte) irq_raster_next#1
  [10] (byte~) irq::$0 ← (byte) irq::raster_next#0 & (byte) 7
  [11] if((byte~) irq::$0!=(byte) 0) goto irq::@1
  to:irq::@2
irq::@2: scope:[irq]  from irq
  [12] (byte) irq::raster_next#1 ← (byte) irq::raster_next#0 - (byte) 1
  to:irq::@1
irq::@1: scope:[irq]  from irq irq::@2
  [13] (byte) irq::raster_next#2 ← phi( irq/(byte) irq::raster_next#0 irq::@2/(byte) irq::raster_next#1 )
  [14] *((const byte*) RASTER#0) ← (byte) irq::raster_next#2
  [15] *((const byte*) BORDERCOL#0) ← (const byte) BLACK#0
  to:irq::@return
irq::@return: scope:[irq]  from irq::@1
  [16] return 
  to:@return
