diff options
Diffstat (limited to 'gcc/tree-ssa-loop-prefetch.c')
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 2f10db1..5310402 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -992,6 +992,22 @@ prune_by_reuse (struct mem_ref_group *groups) static bool should_issue_prefetch_p (struct mem_ref *ref) { + /* Some processors may have a hardware prefetcher that may conflict with + prefetch hints for a range of strides. Make sure we don't issue + prefetches for such cases if the stride is within this particular + range. */ + if (cst_and_fits_in_hwi (ref->group->step) + && absu_hwi (int_cst_value (ref->group->step)) < PREFETCH_MINIMUM_STRIDE) + { + if (dump_file && (dump_flags & TDF_DETAILS)) + fprintf (dump_file, + "Step for reference %u:%u (%d) is less than the mininum " + "required stride of %d\n", + ref->group->uid, ref->uid, int_cst_value (ref->group->step), + PREFETCH_MINIMUM_STRIDE); + return false; + } + /* For now do not issue prefetches for only first few of the iterations. */ if (ref->prefetch_before != PREFETCH_ALL) |