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re PR tree-optimization/82220 (SPEC CPU2006 482.sphinx3 ~10% performance regression with trunk@250416) 

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.

From-SVN: r252917
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Richard Biener 2017-09-18 10:10:31 +00:00 committed by Richard Biener
parent 2eda24e95c
commit 6b1ce94d31
2 changed files with 8 additions and 2 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
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.
2017-09-18 Jakub Jelinek <jakub@redhat.com>
PR target/82145

4
gcc/tree-vect-loop.c
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@ -3663,8 +3663,8 @@ vect_estimate_min_profitable_iters (loop_vec_info loop_vinfo,
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,