Viewing file:  ldist-1.c (1.05 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-O2 -ftree-loop-distribution -fdump-tree-ldist-all" } */
void foo (int * __restrict__ ia,
int * __restrict__ ib,
int * __restrict__ oxa,
int * __restrict__ oxb,
int * __restrict__ oya,
int * __restrict__ oyb)
{
int i;
long int mya[52];
long int myb[52];
for (i=0; i < 52; i++)
{
mya[i] = ia[i] * oxa[i] + ib[i] * oxb[i];
myb[i] = -ia[i] * oxb[i] + ib[i] * oxa[i];
oya[i] = mya[i] >> 10;
oyb[i] = myb[i] >> 10;
}
/* This loop was distributed, but it is not anymore due to the cost
model changes: the result of a distribution would look like this:
| for (i=0; i < 52; i++)
| oya[i] = ia[i] * oxa[i] + ib[i] * oxb[i] >> 10;
|
| for (i=0; i < 52; i++)
| oyb[i] = -ia[i] * oxb[i] + ib[i] * oxa[i] >> 10;
and in this the array IA is read in both tasks. For maximizing
the cache reuse, ldist does not distributes this loop anymore.
*/
}
/* { dg-final { scan-tree-dump-times "distributed: split to 2 loops" 0 "ldist" } } */
|
