This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug target/27855] [4.5/4.7/4.8 regression] reassociation causes the RA to be confused
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 16 Jan 2013 16:40:36 +0000
- Subject: [Bug target/27855] [4.5/4.7/4.8 regression] reassociation causes the RA to be confused
- Auto-submitted: auto-generated
- References: <bug-27855-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27855
Uros Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|i686-pc-linux-gnu |i686-pc-linux-gnu,
| |x86_64-pc-linux-gnu
Status|WAITING |NEW
--- Comment #44 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-16 16:40:36 UTC ---
Still the same old story...
Target: x86_64-unknown-linux-gnu
gcc version 4.8.0 20130116 (experimental) [trunk revision 195240] (GCC)
corei7 SNB:
-DREPS=10000 -msse3 -O2 -ffast-math
ALGORITHM NB REPS TIME MFLOPS
========= ===== ===== ========== ==========
atlasmm 60 10000 1.636 2640.99
-DREPS=10000 -msse3 -O2 -ffast-math -fno-tree-reassoc
ALGORITHM NB REPS TIME MFLOPS
========= ===== ===== ========== ==========
atlasmm 60 10000 1.218 3547.34
-DREPS=10000 -msse3 -O2 -ffast-math -ftree-vectorize
ALGORITHM NB REPS TIME MFLOPS
========= ===== ===== ========== ==========
atlasmm 60 10000 1.654 2612.25
-DREPS=10000 -msse3 -O2 -ffast-math -ftree-vectorize -fno-tree-reassoc
ALGORITHM NB REPS TIME MFLOPS
========= ===== ===== ========== ==========
atlasmm 60 10000 1.555 2778.56
The testcase is at http://www.cs.utsa.edu/~whaley/mmbench4.tar.gz
Reconfirmed with 4.8.0.