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PR 44576: miss rate computation improvement for prefetching loop arrays. 

2010-07-02  Changpeng Fang  <changpeng.fang@amd.com>

	PR middle-end/44576
	* tree-ssa-loop-prefetch.c (compute_miss_rate): Return 1000 (out
	of 1000) for miss rate if the address diference is greater than or
	equal to the cache line size (the two reference will never hit the
	same cache line).

From-SVN: r161727
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Changpeng Fang 2010-07-02 16:34:29 +00:00 committed by Sebastian Pop
parent e4c6a07ab5
commit a245c04bcc
2 changed files with 13 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,11 @@
2010-07-02 Changpeng Fang <changpeng.fang@amd.com>
PR middle-end/44576
* tree-ssa-loop-prefetch.c (compute_miss_rate): Return 1000 (out
of 1000) for miss rate if the address diference is greater than or
equal to the cache line size (the two reference will never hit the
same cache line).
2010-07-02 Bernd Schmidt <bernds@codesourcery.com>
PR target/42835

5
gcc/tree-ssa-loop-prefetch.c
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@ -654,6 +654,11 @@ compute_miss_rate (unsigned HOST_WIDE_INT cache_line_size,
int total_positions, miss_positions, miss_rate;
int address1, address2, cache_line1, cache_line2;
/* It always misses if delta is greater than or equal to the cache
line size. */
if (delta >= cache_line_size)
return 1000;
total_positions = 0;
miss_positions = 0;