@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
  [4] (byte) main::c#0 ← *((const byte*) SCREEN#0)
  [5] (byte) fillscreen::c#0 ← (byte) main::c#0
  [6] call fillscreen 
  to:main::@return
main::@return: scope:[main]  from main
  [7] return 
  to:@return
fillscreen: scope:[fillscreen]  from main
  [8] phi()
  to:fillscreen::@1
fillscreen::@1: scope:[fillscreen]  from fillscreen fillscreen::@1
  [9] (byte) fillscreen::j#2 ← phi( fillscreen/(byte) 0 fillscreen::@1/(byte) fillscreen::j#1 )
  [10] *((const byte*) SCREEN#0 + (byte) fillscreen::j#2) ← (byte) fillscreen::c#0
  [11] *((const byte*) fillscreen::SCREEN2#0 + (byte) fillscreen::j#2) ← (byte) fillscreen::c#0
  [12] *((const byte*) fillscreen::SCREEN3#0 + (byte) fillscreen::j#2) ← (byte) fillscreen::c#0
  [13] *((const byte*) fillscreen::SCREEN4#0 + (byte) fillscreen::j#2) ← (byte) fillscreen::c#0
  [14] (byte) fillscreen::j#1 ← ++ (byte) fillscreen::j#2
  [15] if((byte) fillscreen::j#1!=(byte) 0) goto fillscreen::@1
  to:fillscreen::@return
fillscreen::@return: scope:[fillscreen]  from fillscreen::@1
  [16] return 
  to:@return
