@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] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@1
  [5] (byte*) main::b#2 ← phi( main/(const byte*) main::BITMAP#0+(word) $1fff main::@1/(byte*) main::b#1 )
  [6] *((byte*) main::b#2) ← (byte) $5a
  [7] (byte*) main::b#1 ← -- (byte*) main::b#2
  [8] if((byte*) main::b#1!=(const byte*) main::BITMAP#0-(byte) 1) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@1
  [9] return 
  to:@return
