From: Changpeng Fang Date: Fri, 7 May 2010 16:15:45 +0000 (+0000) Subject: Dump a diagnostic info when the insn-to-mem ratio is too small. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=55e5a2ebc01680658d0e918a5bdb00d119dd8813;p=gcc.git Dump a diagnostic info when the insn-to-mem ratio is too small. 2010-05-07 Changpeng Fang * 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 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 486a7137104..be069988308 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2010-05-07 Changpeng Fang + + * 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 * 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 3377eeb1dbb..6f879887c9f 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