gcc/testsuite/gcc.target/i386/vec-may_alias.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -w -Wno-abi" } */
   3
   4 typedef int v2si __attribute__ ((vector_size (8)));
   5 typedef short v4hi __attribute__ ((vector_size (8)));
   6 typedef short v4hia __attribute__ ((vector_size (8), may_alias));
   7
   8 __attribute__ ((noinline, noclone))
   9 int f (v2si A, int N)
  10 { return ((v4hia)A)[N]; }
  11
  12 __attribute__ ((noinline, noclone))
  13 int g (v2si A, int N)
  14 { return ((v4hi)A)[N]; }
  15
  16 int main()
  17 {
  18   v2si x = { 0, 0 }, y = { 1, 1 };
  19   if (f (x, 0) || f (x, 1) || f (x, 2) || f (x, 3))
  20     __builtin_abort ();
  21   if (g (y, 0) != 1 || g (y, 1) || g (y, 2) != 1 || g (y, 3))
  22     __builtin_abort ();
  23   return 0;
  24 }
  25