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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/toplev.c | |
| 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/toplev.c')
| -rw-r--r-- | gcc/toplev.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/gcc/toplev.c b/gcc/toplev.c index 220c1f777f0..c22cb98fd62 100644 --- a/gcc/toplev.c +++ b/gcc/toplev.c @@ -2013,13 +2013,13 @@ process_options (void) } #ifndef HAVE_prefetch - if (flag_prefetch_loop_arrays) + if (flag_prefetch_loop_arrays > 0) { warning (0, "-fprefetch-loop-arrays not supported for this target"); flag_prefetch_loop_arrays = 0; } #else - if (flag_prefetch_loop_arrays && !HAVE_prefetch) + if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch) { warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)"); flag_prefetch_loop_arrays = 0; @@ -2028,7 +2028,7 @@ process_options (void) /* This combination of options isn't handled for i386 targets and doesn't make much sense anyway, so don't allow it. */ - if (flag_prefetch_loop_arrays && optimize_size) + if (flag_prefetch_loop_arrays > 0 && optimize_size) { warning (0, "-fprefetch-loop-arrays is not supported with -Os"); flag_prefetch_loop_arrays = 0; |