
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::$0 = sum::return#0
  [4] *main::screen = main::$0
  [5] call sum
  [6] sum::return#1 = sum::return#3
  to:main::@2
main::@2: scope:[main]  from main::@1
  [7] main::$1 = sum::return#1
  [8] *(main::screen+1) = main::$1
  [9] call sum
  [10] sum::return#2 = sum::return#3
  to:main::@3
main::@3: scope:[main]  from main::@2
  [11] main::$2 = sum::return#2
  [12] *(main::screen+2) = main::$2
  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/'c', main::@1/'m', main::@2/'l' )
  [15] sum::return#3 = main::reverse + sum::b#3
  to:sum::@return
sum::@return: scope:[sum]  from sum
  [16] return 
  to:@return
