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| author | Changpeng Fang <changpeng.fang@amd.com> | 2010-05-07 16:15:45 +0000 |
|---|---|---|
| committer | Sebastian Pop <spop@gcc.gnu.org> | 2010-05-07 16:15:45 +0000 |
| commit | 55e5a2ebc01680658d0e918a5bdb00d119dd8813 (patch) | |
| tree | c3e1603c63ace84a3385918e8361fe1918b3ba54 /gcc | |
| parent | bb408e876c536829cc57439df8e4a28c43e68456 (diff) | |
| download | gcc-55e5a2ebc01680658d0e918a5bdb00d119dd8813.zip gcc-55e5a2ebc01680658d0e918a5bdb00d119dd8813.tar.gz gcc-55e5a2ebc01680658d0e918a5bdb00d119dd8813.tar.bz2 | |
Dump a diagnostic info when the insn-to-mem ratio is too small.
2010-05-07 Changpeng Fang <changpeng.fang@amd.com>
* tree-ssa-loop-prefetch.c (is_loop_prefetching_profitable): Dump
a diagnostic info when the insn-to-mem ratio is too small.
From-SVN: r159161
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 8 |
2 files changed, 12 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 486a713..be06998 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2010-05-07 Changpeng Fang <changpeng.fang@amd.com> + + * tree-ssa-loop-prefetch.c (is_loop_prefetching_profitable): Dump + a diagnostic info when the insn-to-mem ratio is too small. + 2010-05-07 Richard Guenther <rguenther@suse.de> * gcc.c (LINK_COMMAND_SPEC): Provide a resolution file to diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 3377eeb..6f87988 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -1551,7 +1551,13 @@ is_loop_prefetching_profitable (unsigned ahead, HOST_WIDE_INT est_niter, insn_to_mem_ratio = ninsns / mem_ref_count; if (insn_to_mem_ratio < PREFETCH_MIN_INSN_TO_MEM_RATIO) - return false; + { + if (dump_file && (dump_flags & TDF_DETAILS)) + fprintf (dump_file, + "Not prefetching -- instruction to memory reference ratio (%d) too small\n", + insn_to_mem_ratio); + return false; + } /* Profitability of prefetching is highly dependent on the trip count. For a given AHEAD distance, the first AHEAD iterations do not benefit |