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.
2010-05-11 Jakub Jelinek <jakub@redhat.com>
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;
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;