gcc/testsuite/gcc.dg/tree-ssa/prefetch-3.c

   1 /* Prefetching used to prefer nonsensical unroll factor of 5 in this testcase.  */
   2
   3 /* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */
   4 /* { dg-options "-O2 -fno-tree-vectorize -fprefetch-loop-arrays -march=amdfam10 -fdump-tree-aprefetch-details" } */
   5
   6 #define N 1000000
   7
   8 double a[N];
   9
  10 double test(void)
  11 {
  12   unsigned i;
  13   double sum = 0;
  14
  15   for (i = 0; i < N; i += 2)
  16     sum += (a[i] * a[i+1]);
  17
  18   return sum;
  19 }
  20
  21 /* { dg-final { scan-tree-dump-times "unroll factor 4" 1 "aprefetch" } } */