@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call malloc 
  [3] (byte*) malloc::return#2 ← (byte*) malloc::return#0
  to:@3
@3: scope:[]  from @1
  [4] (byte*) SCREEN_1#0 ← (byte*) malloc::return#2
  [5] call malloc 
  [6] (byte*) malloc::return#3 ← (byte*) malloc::return#0
  to:@4
@4: scope:[]  from @3
  [7] (byte*) SCREEN_2#0 ← (byte*) malloc::return#3
  to:@2
@2: scope:[]  from @4
  [8] phi()
  [9] call main 
  to:@end
@end: scope:[]  from @2
  [10] phi()
main: scope:[main]  from @2
  [11] *((byte*) SCREEN_1#0) ← (byte) 0
  [12] *((byte*) SCREEN_2#0) ← (byte) 0
  to:main::@return
main::@return: scope:[main]  from main
  [13] return 
  to:@return
malloc: scope:[malloc]  from @1 @3
  [14] (byte*) MEM#5 ← phi( @1/(byte*) 1024 @3/(byte*) MEM#1 )
  [15] (byte*) MEM#1 ← ++ (byte*) MEM#5
  [16] (byte*) malloc::return#0 ← (byte*) MEM#1
  to:malloc::@return
malloc::@return: scope:[malloc]  from malloc
  [17] return 
  to:@return
