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| author | spop <spop@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-06-25 18:25:00 +0000 |
|---|---|---|
| committer | spop <spop@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-06-25 18:25:00 +0000 |
| commit | cd459e62b04311c582ab885d30ded5d062842c42 (patch) | |
| tree | 30ce2860b1afc7397546e4427a13dcdcc2f04f2b /gcc/common.opt | |
| parent | 123fe3ea5ed1103ab4731c6881ee8014138ae127 (diff) | |
| download | gcc-cd459e62b04311c582ab885d30ded5d062842c42.tar.gz | |
Enable prefetching at -O3 for AMD cpus.
2010-06-25 Changpeng Fang <changpeng.fang@amd.com>
* common.opt (fprefetch-loop-arrays): Re-define
-fprefetch-loop-arrays as a tri-state option with the initial
value of -1.
* tree-ssa-loop.c (gate_tree_ssa_loop_prefetch): Invoke prefetch
pass only when flag_prefetch_loop_arrays > 0.
* toplev.c (process_options): Note that, with tri-states,
flag_prefetch_loop_arrays>0 means prefetching is enabled.
* config/i386/i386.c (override_options): Enable prefetching at -O3
for a set of CPUs that sw prefetching is helpful.
(software_prefetching_beneficial_p): New. Return TRUE if software
prefetching is beneficial for the given CPU.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@161391 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/common.opt')
| -rw-r--r-- | gcc/common.opt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/common.opt b/gcc/common.opt index 82a4e75e890..6ca787a4b5f 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -949,7 +949,7 @@ Common Report Var(flag_predictive_commoning) Optimization Run predictive commoning optimization. fprefetch-loop-arrays -Common Report Var(flag_prefetch_loop_arrays) Optimization +Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization Generate prefetch instructions, if available, for arrays in loops fprofile |