@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] *((const byte*) main::SCREEN#0) ← (const byte) main::midw#0
  [5] *((const byte*) main::SCREEN#0+(byte) 1) ← (const byte) main::midb#0
  [6] if(*((const byte*) main::SCREEN#0)==*((const byte*) main::SCREEN#0+(byte) 1)) goto main::@1
  to:main::@2
main::@2: scope:[main]  from main
  [7] *((const byte*) main::BGCOL#0) ← (byte) 2
  to:main::@return
main::@return: scope:[main]  from main::@1 main::@2
  [8] return 
  to:@return
main::@1: scope:[main]  from main
  [9] *((const byte*) main::BGCOL#0) ← (byte) 5
  to:main::@return
