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[Bug regression/35671] GCC 4.4.x vs. 4.2.x performance regression
- From: "hjl dot tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 Apr 2009 02:24:42 -0000
- Subject: [Bug regression/35671] GCC 4.4.x vs. 4.2.x performance regression
- References: <bug-35671-5637@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from hjl dot tools at gmail dot com 2009-04-18 02:24 -------
(In reply to comment #4)
> Test configuration:
>
> Software: Linux kernel 2.6.28.9 x86, GCC 4.2.4, GCC 4.4.0 RC,
> http://www.rarlab.com/rar/unrarsrc-3.8.5.tar.gz
>
> Hardware: AMD64 Dual Core CPU 5600, 1MB x 2 level 2 cache
> RAM: DDR2 800MHz 4GB
>
> unrarsrc-3.8.5.tar.gz compiled binary (compilation flags: -march=pentium2 -O2
> -ftree-vectorize):
>
Why do you use -march=pentium2 on AMD64 Dual Core CPU 5600? Remove
-march=pentium2 and report what you get.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35671