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| -rw-r--r-- | gcc/ChangeLog | 8 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 5 |
2 files changed, 13 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index bd7b258b499..7e7944a6618 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 65474898ad9..934b49c0406 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -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; |