gcc/testsuite/gcc.dg/pr64316.c

   1 /* PR rtl-optimization/64316 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O3" } */
   4 /* { dg-additional-options "-mavx2" { target { i?86-*-* x86_64-*-* } } } */
   5
   6 struct S
   7 {
   8   unsigned int s;
   9   unsigned long w[];
  10 };
  11
  12 struct S **s;
  13
  14 int
  15 foo (struct S *x, struct S *y, struct S *z)
  16 {
  17   unsigned int i;
  18   unsigned long *a, *b, *c;
  19   int r = 0;
  20   for (a = x->w, b = y->w, c = z->w, i = 0; i < x->s; i++, a++)
  21     {
  22       unsigned long d = *b++ & *c++;
  23       if (*a != d)
  24         {
  25           r = 1;
  26           *a = d;
  27         }
  28     }
  29   return r;
  30 }
  31
  32 void
  33 bar (int x)
  34 {
  35   int p = x - 1;
  36   do
  37     {
  38       foo (s[x], s[x], s[p]);
  39       p--;
  40     }
  41   while (p > 0);
  42 }