diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 4 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 960d11c..2059c93 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2010-06-09 Changpeng Fang <changpeng.fang@amd.com> + * tree-ssa-loop-prefetch.c (gather_memory_references_ref): + Do not the gather memory reference in the outer loop if the step + is not a constant. + +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. diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 705ee81..8097124 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -513,6 +513,10 @@ gather_memory_references_ref (struct loop *loop, struct mem_ref_group **refs, if (step == NULL_TREE) return false; + /* Limit non-constant step prefetching only to the innermost loops. */ + if (!cst_and_fits_in_hwi (step) && loop->inner != NULL) + return false; + /* Now we know that REF = &BASE + STEP * iter + DELTA, where DELTA and STEP are integer constants. */ agrp = find_or_create_group (refs, base, step); |