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[Bug rtl-optimization/70873] [7 Regressio] 20% performance regression at 482.sphinx3 after r235442 with -O2 -m32 on Haswell.
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 29 Apr 2016 21:18:29 +0000
- Subject: [Bug rtl-optimization/70873] [7 Regressio] 20% performance regression at 482.sphinx3 after r235442 with -O2 -m32 on Haswell.
- Auto-submitted: auto-generated
- References: <bug-70873-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70873
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ubizjak at gmail dot com
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
This optimization is implemented with define_peephole2:
commit 01c074df07cc82f1a032d12a786b3109467a2a6b
Author: wmi <wmi@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue Oct 1 23:32:55 2013 +0000
2013-10-01 Wei Mi <wmi@google.com>
* config/i386/x86-tune.def (DEF_TUNE): Remove
m_CORE_ALL.
* config/i386/i386.md: Add define_peephole2 to
break partial reg stall for cvtss2sd/cvtsd2ss.
which is sensitive to regrename. Should it be implemented with
define_split?