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
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2010-06-09 Changpeng Fang <changpeng.fang@amd.com>
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* tree-ssa-loop-prefetch.c (PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO) :
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Change the PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO threshold value from
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8 to 4. Minor change of the related comments.
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2010-06-09 Sebastian Pop <sebastian.pop@amd.com>
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* tree-scalar-evolution.c (instantiate_scev_name): Do not fail
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@ -228,13 +228,13 @@ struct mem_ref_group
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/* Do not generate a prefetch if the unroll factor is significantly less
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than what is required by the prefetch. This is to avoid redundant
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prefetches. For example, if prefetch_mod is 16 and unroll_factor is
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1, this means prefetching requires unrolling the loop 16 times, but
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the loop is not going to be unrolled. In this case (ratio = 16),
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prefetches. For example, when prefetch_mod is 16 and unroll_factor is
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2, prefetching requires unrolling the loop 16 times, but
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the loop is actually unrolled twice. In this case (ratio = 8),
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prefetching is not likely to be beneficial. */
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#ifndef PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO
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#define PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO 8
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#define PREFETCH_MOD_TO_UNROLL_FACTOR_RATIO 4
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#endif
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/* The memory reference. */
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