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Diffstat (limited to 'gcc/tree-ssa-loop-prefetch.c')
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 8 |
1 files changed, 7 insertions, 1 deletions
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 |