@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()

(void()) main()
main: scope:[main]  from @1
  [4] phi()
  [5] call line 
  to:main::@1
main::@1: scope:[main]  from main
  [6] phi()
  [7] call line 
  to:main::@return
main::@return: scope:[main]  from main::@1
  [8] return 
  to:@return

(void()) line((byte) line::x0 , (byte) line::x1)
line: scope:[line]  from main main::@1
  [9] (byte*) screen#16 ← phi( main/(byte*) 1024 main::@1/(byte*) screen#10 )
  [9] (byte) line::x1#3 ← phi( main/(byte) 2 main::@1/(byte) 5 )
  [9] (byte) line::x#0 ← phi( main/(byte) 1 main::@1/(byte) 3 )
  to:line::@1
line::@1: scope:[line]  from line line::@2
  [10] (byte*) screen#10 ← phi( line/(byte*) screen#16 line::@2/(byte*) screen#4 )
  [10] (byte) line::x#2 ← phi( line/(byte) line::x#0 line::@2/(byte) line::x#1 )
  [11] if((byte) line::x#2<(byte) line::x1#3) goto line::@2
  to:line::@return
line::@return: scope:[line]  from line::@1
  [12] return 
  to:@return
line::@2: scope:[line]  from line::@1
  [13] *((byte*) screen#10) ← (byte) line::x#2
  [14] (byte*) screen#4 ← ++ (byte*) screen#10
  [15] (byte) line::x#1 ← ++ (byte) line::x#2
  to:line::@1
