@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()
main: scope:[main]  from @1
  asm { sei  }
  to:main::@1
main::@1: scope:[main]  from main main::@1
  [5] (byte) main::col#0 ← *((const byte*) RASTER#0)
  [6] *((const byte*) BGCOL#0) ← (byte) main::col#0
  to:main::@1
