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[Bug tree-optimization/85999] New: 416.gamess slowed down by BB vectorization
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 30 May 2018 16:43:30 +0000
- Subject: [Bug tree-optimization/85999] New: 416.gamess slowed down by BB vectorization
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85999
Bug ID: 85999
Summary: 416.gamess slowed down by BB vectorization
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
Adding -ftree-slp-vectorize to -O2 -march=haswell [-mprefer-avx128] on
416.gamess
slows down the benchmark significantly. Adding -fno-tree-slp-vectorize to
-Ofast -march=haswell speeds it up.
Thus somehow BB vectorization slows down 416.gamess.