The following is said to fix a 482.sphinx3 regression.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2017-09-18 Richard Biener <rguent...@suse.de>
PR tree-optimization/82220
* tree-vect-loop.c (vect_estimate_min_profitable_iters): Exclude
epilogue niters from the min_profitable_iters compute.
Index: gcc/tree-vect-loop.c
===================================================================
--- gcc/tree-vect-loop.c (revision 252907)
+++ gcc/tree-vect-loop.c (working copy)
@@ -3663,8 +3663,8 @@ vect_estimate_min_profitable_iters (loop
min_profitable_iters);
/* We want the vectorized loop to execute at least once. */
- if (min_profitable_iters < (vf + peel_iters_prologue + peel_iters_epilogue))
- min_profitable_iters = vf + peel_iters_prologue + peel_iters_epilogue;
+ if (min_profitable_iters < (vf + peel_iters_prologue))
+ min_profitable_iters = vf + peel_iters_prologue;
if (dump_enabled_p ())
dump_printf_loc (MSG_NOTE, vect_location,
