gcc/testsuite/gcc.dg/tree-ssa/forwprop-19.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-forwprop1" } */
   3
   4 typedef int vec __attribute__((vector_size (4 * sizeof (int))));
   5 void f (vec *x1, vec *x2)
   6 {
   7   vec m = { 1, 2, 3, 0 };
   8   vec n = { 3, 0, 1, 2 };
   9   vec y = __builtin_shuffle (*x1, *x2, n);
  10   vec z = __builtin_shuffle (y, m);
  11   *x1 = z;
  12 }
  13
  14 /* { dg-final { scan-tree-dump-not "VEC_PERM_EXPR" "forwprop1" } } */