gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-10.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-iftoswitch-optimized --param case-values-threshold=5" } */
   3
   4 int global;
   5 int foo ();
   6
   7 int main(int argc, char **argv)
   8 {
   9   if (argc != 1)
  10     {
  11       if (argc != 2)
  12         {
  13           if (argc == 3)
  14             {
  15               foo ();
  16               foo ();
  17             }
  18           else if (argc == 4)
  19             {
  20               foo ();
  21             }
  22           else if (argc == 5)
  23             {
  24               global = 2;
  25             }
  26           else
  27             global -= 123;
  28         }
  29       else
  30         {
  31           global += 1;
  32         }
  33     }
  34   else
  35     foo ();
  36
  37
  38   global -= 12;
  39   return 0;
  40 }
  41
  42 /* { dg-final { scan-tree-dump "Canonical GIMPLE case clusters: 1 2 3 4 5" "iftoswitch" } } */
  43 /* { dg-final { scan-tree-dump "Condition chain with \[^\n\r]\* BBs transformed into a switch statement." "iftoswitch" } } */
  44