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From: "jv244 at cam dot ac dot uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/38306] [4.4/4.5 Regression] 15% slowdown w.r.t. 4.3 of computational kernel on some architectures
Date: Tue, 01 Sep 2009 06:56:00 -0000 [thread overview]
Message-ID: <20090901065621.2675.qmail@sourceware.org> (raw)
In-Reply-To: <bug-38306-6642@http.gcc.gnu.org/bugzilla/>
------- Comment #14 from jv244 at cam dot ac dot uk 2009-09-01 06:56 -------
I wanted to try Vladimir Makarov's new patch for this testcase, but on an
unpatched trunk I notice a serious runtime regression with '-fschedule-insns'
with respect to 4.3.3
Using as base options (for the attached testcase)
gfortran -O3 -march=native -funroll-loops -ffast-math test.f90
4.3.3 w -fschedule-insns : 3.372s
4.3.3 w/o -fschedule-insns : 4.384s
4.4.2 w -fschedule-insns : 4.748s
4.4.2 w/o -fschedule-insns : 4.408s
4.5.0 w -fschedule-insns : 4.712s
4.5.0 w/o -fschedule-insns : 4.408s
so 4.3 against 4.5 'w -fschedule-insns' is about 40% faster.
I guess this is pretty target specific, I'm running this on an Opteron, this is
what -v reports:
Target: x86_64-unknown-linux-gnu
Configured with: /data03/vondele/gcc_trunk/gcc/configure --disable-bootstrap
--prefix=/data03/vondele/gcc_trunk/build --enable-languages=c,c++,fortran
--disable-multilib --with-ppl=/data03/vondele/gcc_trunk/build/
--with-cloog=/data03/vondele/gcc_trunk/build/
Thread model: posix
gcc version 4.5.0 20090830 (experimental) [trunk revision 151229] (GCC)
COLLECT_GCC_OPTIONS='-O3' '-funroll-loops' '-ffast-math' '-fschedule-insns'
'-v' '-shared-libgcc'
/data03/vondele/gcc_trunk/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/f951
test.f90 -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param
l1-cache-line-size=64 --param l2-cache-size=1024 -mtune=k8 -quiet -dumpbase
test.f90 -auxbase test -O3 -version -funroll-loops -ffast-math -fschedule-insns
-fintrinsic-modules-path
/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/finclude
-o /tmp/ccvGq2CO.s
--
jv244 at cam dot ac dot uk changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vmakarov at redhat dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38306
next prev parent reply other threads:[~2009-09-01 6:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-28 16:02 [Bug target/38306] New: [4.4 Regression] 15% slowdown of computational kernel jv244 at cam dot ac dot uk
2008-11-28 16:03 ` [Bug target/38306] " jv244 at cam dot ac dot uk
2008-11-28 16:25 ` pinskia at gcc dot gnu dot org
2008-11-30 11:40 ` rguenth at gcc dot gnu dot org
2008-11-30 11:49 ` rguenth at gcc dot gnu dot org
2008-11-30 16:18 ` jv244 at cam dot ac dot uk
2008-11-30 16:27 ` jv244 at cam dot ac dot uk
2008-11-30 16:40 ` rguenth at gcc dot gnu dot org
2008-12-03 19:04 ` [Bug target/38306] [4.4 Regression] 15% slowdown w.r.t. 4.3 of computational kernel on some architectures steven at gcc dot gnu dot org
2008-12-03 21:29 ` hjl dot tools at gmail dot com
2008-12-04 16:12 ` jv244 at cam dot ac dot uk
2008-12-05 12:18 ` rguenth at gcc dot gnu dot org
2008-12-06 15:38 ` steven at gcc dot gnu dot org
2008-12-06 18:56 ` jv244 at cam dot ac dot uk
2009-02-11 19:00 ` bonzini at gnu dot org
2009-02-11 19:25 ` jv244 at cam dot ac dot uk
2009-04-21 15:59 ` [Bug target/38306] [4.4/4.5 " jakub at gcc dot gnu dot org
2009-07-22 10:35 ` jakub at gcc dot gnu dot org
2009-09-01 6:56 ` jv244 at cam dot ac dot uk [this message]
2009-09-01 8:54 ` bonzini at gnu dot org
2009-09-01 9:13 ` jv244 at cam dot ac dot uk
2009-09-01 9:18 ` jv244 at cam dot ac dot uk
2009-10-15 12:50 ` jakub at gcc dot gnu dot org
2010-01-21 13:19 ` jakub at gcc dot gnu dot org
2010-04-30 9:00 ` [Bug target/38306] [4.4/4.5/4.6 " jakub at gcc dot gnu dot org
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