[PATCH] Fix PR82220

[Richard Biener]

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  <rguenther@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,