gcc/testsuite/gcc.dg/tree-ssa/tailcall-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-tailc-details" } */
   3 extern void *alloca (__SIZE_TYPE__);
   4 int q(int a);
   5 int *v;
   6 int
   7 t(int a)
   8 {
   9         int r,r1;
  10         if (a)
  11                 r1=r = q(a-1);
  12         else
  13                 return 0;
  14         /* Dead alloca should not disturb us.  */
  15         if (r!=r1)
  16                 v=alloca(r);
  17         return r;
  18 }
  19 /* { dg-final { scan-tree-dump-times "Found tail call" 1 "tailc"} } */
  20 /* { dg-final { cleanup-tree-dump "tailc" } } */