void main()
main: scope:[main]  from
  [0] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@2
  [1] main::idx#2 = phi( main/0, main::@2/main::idx#1 )
  [1] main::i#3 = phi( main/0, main::@2/main::i#1 )
  [2] if(main::i#3<5+1) goto main::@4
  to:main::@3
main::@3: scope:[main]  from main::@1
  [3] main::j#1 = main::i#3 + main::i#3
  to:main::@2
main::@2: scope:[main]  from main::@3 main::@4
  [4] main::j#2 = phi( main::@4/main::j#4, main::@3/main::j#1 )
  [5] main::screen[main::idx#2] = main::j#2
  [6] main::idx#1 = ++ main::idx#2
  [7] main::i#1 = ++ main::i#3
  [8] if(main::i#1!=$b) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@2
  [9] return 
  to:@return
main::@4: scope:[main]  from main::@1
  [10] main::j#4 = main::i#3
  to:main::@2