
void main()
main: scope:[main]  from
  [0] phi()
  [1] call sum
  [2] sum::return#0 = sum::return#3
  to:main::@1
main::@1: scope:[main]  from main
  [3] main::s1#0 = sum::return#0
  [4] call sum
  [5] sum::return#1 = sum::return#3
  to:main::@2
main::@2: scope:[main]  from main::@1
  [6] main::s2#0 = sum::return#1
  [7] call sum
  [8] sum::return#2 = sum::return#3
  to:main::@3
main::@3: scope:[main]  from main::@2
  [9] main::s3#0 = sum::return#2
  [10] main::$3 = main::s1#0 + main::s2#0
  [11] main::s4#0 = main::$3 + main::s3#0
  [12] *screen = main::s4#0
  to:main::@return
main::@return: scope:[main]  from main::@3
  [13] return 
  to:@return

char sum(char a , char b)
sum: scope:[sum]  from main main::@1 main::@2
  [14] sum::b#3 = phi( main/2, main::@1/4, main::@2/$d )
  [14] sum::a#3 = phi( main/1, main::@1/3, main::@2/9 )
  [15] sum::return#3 = sum::a#3 + sum::b#3
  to:sum::@return
sum::@return: scope:[sum]  from sum
  [16] return 
  to:@return
