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[Bug tree-optimization/79390] [7 Regression] 10% performance drop in SciMark2 LU after r242550
- 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: Tue, 28 Mar 2017 13:21:14 +0000
- Subject: [Bug tree-optimization/79390] [7 Regression] 10% performance drop in SciMark2 LU after r242550
- Auto-submitted: auto-generated
- References: <bug-79390-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79390
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |6.3.1
Target Milestone|--- |7.0
Summary|10% performance drop in |[7 Regression] 10%
|SciMark2 LU after r242550 |performance drop in
| |SciMark2 LU after r242550
--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
On more recent trunk -fno-split-paths makes only a tiny difference (4882 vs.
4779 Mflops) while -ftree-loop-if-convert still results in 5432 Mflops. GCC 6
scores 5523 Mflops for me (-O3 -march=native on a Broadwell CPU).
Marking as regression.