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Adjust the threshold value of PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO 

2010-06-09  Changpeng Fang  <changpeng.fang@amd.com>

	* tree-ssa-loop-prefetch.c (PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO) :
	Change the PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO threshold value from
	8 to 4.  Minor change of the related comments.

From-SVN: r160514
This commit is contained in:
Changpeng Fang 2010-06-09 22:51:46 +00:00 committed by Sebastian Pop
parent 7472eb13e9
commit f7963a7ce7
2 changed files with 10 additions and 4 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2010-06-09 Changpeng Fang <changpeng.fang@amd.com>
* tree-ssa-loop-prefetch.c (PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO) :
Change the PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO threshold value from
8 to 4. Minor change of the related comments.
2010-06-09 Sebastian Pop <sebastian.pop@amd.com>
* tree-scalar-evolution.c (instantiate_scev_name): Do not fail

8
gcc/tree-ssa-loop-prefetch.c
View File

@ -228,13 +228,13 @@ struct mem_ref_group
/* Do not generate a prefetch if the unroll factor is significantly less
than what is required by the prefetch. This is to avoid redundant
prefetches. For example, if prefetch_mod is 16 and unroll_factor is
1, this means prefetching requires unrolling the loop 16 times, but
the loop is not going to be unrolled. In this case (ratio = 16),
prefetches. For example, when prefetch_mod is 16 and unroll_factor is
2, prefetching requires unrolling the loop 16 times, but
the loop is actually unrolled twice. In this case (ratio = 8),
prefetching is not likely to be beneficial. */
#ifndef PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO
#define PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO 8
#define PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO 4
#endif
/* The memory reference. */