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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
This commit is contained in:
Changpeng Fang 2010-05-07 16:15:45 +00:00 committed by Sebastian Pop
parent bb408e876c
commit 55e5a2ebc0
2 changed files with 12 additions and 1 deletions
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5
gcc/ChangeLog
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@ -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

8
gcc/tree-ssa-loop-prefetch.c
View File

@ -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