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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159161
138bc75d-0d04-0410-961f-
82ee72b054a4
+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
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