public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "william dot crocker at analog dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler Date: Thu, 29 Jan 2004 16:27:00 -0000 [thread overview] Message-ID: <20040129162757.30646.qmail@sources.redhat.com> (raw) In-Reply-To: <20040116211131.13712.william.crocker@analog.com> ------- Additional Comments From william dot crocker at analog dot com 2004-01-29 16:27 ------- Subject: Re: Executable runs 25% slower than when compiled with INTEL compiler > > ------- Additional Comments From falk at debian dot org 2004-01-29 16:01 ------- > Thanks for the test case. I see it's using FP math heavily. Could you also > try the options -ffast-math and -mfpmath=sse? AFAIK the Intel compiler does > the equivalent of these switches by default so they are needed for a fair > comparison. > Your email suggest that I sould put something (?) after the sse, but the online GCC doc does not show this. I get this when compiling. >/home/whc/lintel/gcc/usr_local/bin/g++ -O3 -c -Wno-deprecated -ffast-math -mfpmath=sse y.cc cc1plus: warning: SSE instruction set disabled, using 387 arithmetics I also tried -msse and -msse2, but got no better than 30 Seconds. ANYWAY it runs and I get the following which now shows INTEL with only a 22% advantage versus the previous 37%. Bill ###### USING GCC ###### `/home/whc/lintel/gcc/usr_local/bin/g++ -v` Reading specs from /home/whc/lintel/gcc/usr_local/lib/gcc-lib/i686-pc-linux-gnu/3.3.2/specs Configured with: ./configure --prefix=/home/whc/lintel/gcc/usr_local --exec-prefix=/home/whc/lintel/gcc/usr_local Thread model: posix gcc version 3.3.2 /home/whc/lintel/gcc/usr_local/bin/g++ -O3 -c -Wno-deprecated -ffast-math -mfpmath=sse y.cc cc1plus: warning: SSE instruction set disabled, using 387 arithmetics ls -ls y.o 46 -rw-r--r-- 1 whc cad 46676 Jan 29 11:05 y.o /home/whc/lintel/gcc/usr_local/bin/g++ -O3 -o y y.o /bin/csh -c "(setenv LD_LIBRARY_PATH /home/whc/lintel/gcc/usr_local/lib; time y)" X422 = 469.196 30.669u 0.007s 0:31.04 98.7% 0+0k 0+0io 235pf+0w ###### USING ICC ###### /dcad/apps/intel/compiler70/ia32/bin/icc -V -c -O y.cc Intel(R) C++ Compiler for 32-bit applications, Version 7.1 Build 20030307Z Copyright (C) 1985-2003 Intel Corporation. All rights reserved. Edison Design Group C/C++ Front End, version 3.0 (Mar 8 2003 18:39:53) Copyright 1988-2002 Edison Design Group, Inc. ls -ls y.o 144 -rw-r--r-- 1 whc cad 135824 Jan 29 11:06 y.o /dcad/apps/intel/compiler70/ia32/bin/icc -o y y.o /bin/csh -c "(setenv LD_LIBRARY_PATH /dcad/apps/intel/compiler70/ia32/lib; time y)" X422 = 469.196 23.871u 0.011s 0:24.13 98.9% 0+0k 0+0io 178pf+0w [whc@juno testcase]$ > > -- > What |Removed |Added > ---------------------------------------------------------------------------- > GCC build triplet|??? | > GCC host triplet|DELL, Pentium4, Linux RedHat| > |7.3 | > GCC target triplet|??? |i686-pc-linux-gnu > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712 > > ------- You are receiving this mail because: ------- > You reported the bug, or are watching the reporter. > -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712
next prev parent reply other threads:[~2004-01-29 16:27 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-01-16 21:11 [Bug c++/13712] New: " william dot crocker at analog dot com 2004-01-16 22:54 ` [Bug c++/13712] " pinskia at gcc dot gnu dot org 2004-01-22 19:42 ` william dot crocker at analog dot com 2004-01-22 19:45 ` [Bug optimization/13712] " pinskia at gcc dot gnu dot org 2004-01-22 19:48 ` bangerth at dealii dot org 2004-01-29 13:10 ` william dot crocker at analog dot com 2004-01-29 13:16 ` falk dot hueffner at student dot uni-tuebingen dot de 2004-01-29 13:29 ` william dot crocker at analog dot com 2004-01-29 16:01 ` falk at debian dot org 2004-01-29 16:27 ` william dot crocker at analog dot com [this message] 2004-01-29 16:48 ` falk at debian dot org 2004-02-03 21:34 ` william dot crocker at analog dot com 2004-02-16 14:55 ` uros at kss-loka dot si 2005-01-23 18:39 ` [Bug rtl-optimization/13712] " steven at gcc dot gnu dot org 2005-01-24 11:16 ` uros at kss-loka dot si 2005-04-24 14:18 ` steven at gcc dot gnu dot org 2005-05-07 15:27 ` steven at gcc dot gnu dot org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20040129162757.30646.qmail@sources.redhat.com \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).