gcc/testsuite/gcc.dg/vect/pr83857.c

   1 /* { dg-additional-options "-ffast-math" } */
   2
   3 #define N 100
   4
   5 double __attribute__ ((noinline, noclone))
   6 f (double *x, double y)
   7 {
   8   double a = 0;
   9   for (int i = 0; i < N; ++i)
  10     {
  11       a += y;
  12       x[i * 2] += a;
  13       x[i * 2 + 1] += a;
  14     }
  15   return a - y;
  16 }
  17
  18 double x[N * 2];
  19
  20 int
  21 main (void)
  22 {
  23   if (f (x, 5) != (N - 1) * 5)
  24     __builtin_abort ();
  25   return 0;
  26 }
  27
  28 /* { dg-final { scan-tree-dump "Loop contains only SLP stmts" "vect" { target vect_double } } } */
  29 /* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" { target vect_double } } } */