Viewing file:  vect-reduc-in-order-2.c (1.05 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* { dg-xfail-run-if "" { { i?86-*-* x86_64-*-* } && ia32 } } */
/* { dg-require-effective-target vect_double } */
/* { dg-add-options ieee } */
/* { dg-additional-options "-fno-fast-math" } */
#include "tree-vect.h"
#define N (VECTOR_BITS * 17)
double __attribute__ ((noinline, noclone))
reduc_plus_double (double *restrict a, int n)
{
double res = 0.0;
for (int i = 0; i < n; i++)
for (int j = 0; j < N; j++)
res += a[i];
return res;
}
int __attribute__ ((optimize (1)))
main ()
{
int n = 19;
double a[N];
double r = 0;
for (int i = 0; i < N; i++)
{
a[i] = (i * 0.1) * (i & 1 ? 1 : -1);
asm volatile ("" ::: "memory");
}
for (int i = 0; i < n; i++)
for (int j = 0; j < N; j++)
{
r += a[i];
asm volatile ("" ::: "memory");
}
double res = reduc_plus_double (a, n);
if (res != r)
__builtin_abort ();
return 0;
}
/* { dg-final { scan-tree-dump {in-order double reduction not supported} "vect" } } */
/* { dg-final { scan-tree-dump-times {using an in-order \(fold-left\) reduction} 1 "vect" } } */
|
