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-require-effective-target ilp32 } */
   5 /* { dg-options "-O2 -fprefetch-loop-arrays -march=athlon -msse2 -mfpmath=sse -fdump-tree-aprefetch-details" } */
   6
   7 #define N 1000000
   8
   9 double a[N];
  10
  11 double test(void)
  12 {
  13   unsigned i;
  14   double sum = 0;
  15
  16   for (i = 0; i < N; i += 2)
  17     sum += (a[i] * a[i+1]);
  18
  19   return sum;
  20 }
  21
  22 /* { dg-final { scan-tree-dump-times "unroll factor 4" 1 "aprefetch" } } */
  23 /* { dg-final { cleanup-tree-dump "aprefetch" } } */