gcc/testsuite/gcc.c-torture/compile/pr46248.c

   1 /* PR rtl-optimization/46248 */
   2
   3 struct S
   4 {
   5   int s;
   6 };
   7
   8 void
   9 foo (unsigned char *x, int y, struct S *z)
  10 {
  11   const int l1 = y;
  12   const int l2 = y + l1;
  13   const int l3 = y + l2;
  14   const int l4 = y + l3;
  15   const int l5 = y + l4;
  16   const int l6 = y + l5;
  17   const int l7 = y + l6;
  18   int i;
  19   for (i = 0; i < 8; i++)
  20     {
  21       int a = x[l3] - x[l4];
  22       int b = x[l4] - x[l5];
  23       int c = x[l5] - x[l6];
  24       int d = (b >= 0 ? b : -b) - (((a >= 0 ? a : -a) + (c >= 0 ? c : -c)) >> 1);
  25       if (d < z->s * 2)
  26         {
  27           int v = d * (-b > 0 ? 1 : -1);
  28           x[l2] += v >> 3;
  29           x[l7] -= v >> 3;
  30         }
  31     }
  32 }