
void main()
main: scope:[main]  from
  [0] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@2
  [1] main::sc#2 = phi( main/main::screen, main::@2/main::sc#1 )
  [2] if(main::sc#2<=main::screen+$3e7) goto main::@2
  to:main::@3
main::@3: scope:[main]  from main::@1 main::@4
  [3] main::cc#2 = phi( main::@1/main::cols+$3e7, main::@4/main::cc#1 )
  [4] if(main::cc#2>main::cols-1) goto main::@4
  to:main::@return
main::@return: scope:[main]  from main::@3
  [5] return 
  to:@return
main::@4: scope:[main]  from main::@3
  [6] *main::cc#2 = 2
  [7] main::cc#1 = -- main::cc#2
  to:main::@3
main::@2: scope:[main]  from main::@1
  [8] *main::sc#2 = 'a'
  [9] main::sc#1 = ++ main::sc#2
  to:main::@1
