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tree-ssa-loop-prefetch.c (prune_ref_by_group_reuse): Reset prefetch_before to PREFETCH_ALL if to accesses "meet" beyond cache size. 

2010-05-11  Christian Borntraeger  <borntraeger@de.ibm.com>

        * tree-ssa-loop-prefetch.c (prune_ref_by_group_reuse): Reset
	prefetch_before to PREFETCH_ALL if to accesses "meet" beyond
	cache size.

From-SVN: r159257
This commit is contained in:
Christian Borntraeger 2010-05-11 07:29:59 +00:00 committed by Andreas Krebbel
parent a8beb3a7be
commit 57762e976d
2 changed files with 12 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2010-05-11 Christian Borntraeger <borntraeger@de.ibm.com>
* tree-ssa-loop-prefetch.c (prune_ref_by_group_reuse): Reset
prefetch_before to PREFETCH_ALL if to accesses "meet" beyond
cache size.
2010-05-11 Christian Borntraeger <borntraeger@de.ibm.com>
* tree-ssa-loop-prefetch.c: Add debug for dropped prefetches.

6
gcc/tree-ssa-loop-prefetch.c
View File

@ -716,6 +716,9 @@ prune_ref_by_group_reuse (struct mem_ref *ref, struct mem_ref *by,
hit_from = ddown (delta_b, PREFETCH_BLOCK) * PREFETCH_BLOCK;
prefetch_before = (hit_from - delta_r + step - 1) / step;
/* Do not reduce prefetch_before if we meet beyond cache size. */
if (prefetch_before > abs (L2_CACHE_SIZE_BYTES / step))
prefetch_before = PREFETCH_ALL;
if (prefetch_before < ref->prefetch_before)
ref->prefetch_before = prefetch_before;
@ -746,6 +749,9 @@ prune_ref_by_group_reuse (struct mem_ref *ref, struct mem_ref *by,
reduced_prefetch_block, align_unit);
if (miss_rate <= ACCEPTABLE_MISS_RATE)
{
/* Do not reduce prefetch_before if we meet beyond cache size. */
if (prefetch_before > L2_CACHE_SIZE_BYTES / PREFETCH_BLOCK)
prefetch_before = PREFETCH_ALL;
if (prefetch_before < ref->prefetch_before)
ref->prefetch_before = prefetch_before;