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[Bug target/37367] [4.4/4.5 Regression] gcc-4.4/4.5 speed regression
- From: "jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 22 Mar 2010 10:47:31 -0000
- Subject: [Bug target/37367] [4.4/4.5 Regression] gcc-4.4/4.5 speed regression
- References: <bug-37367-12873@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from jakub at gcc dot gnu dot org 2010-03-22 10:47 -------
>From the numbers Vladimir posted for SPEC2k, x86_64 -mtune=generic vs.
-mtune=core2 has the same rate for SPECint, with core2 slightly smaller code
size, for SPECfp -mtune=core2 has 0.4% worse rate due to 10% drop on facerec
(otherwise it would be 0.4% win) with slightly smaller code for -mtune=core2.
On x86 SPECint is slightly worse with -mtune=core2 and even code size is
slightly larger, SPECfp on the other side has both slightly better rate and
code size with -mtune=core2. So using generic tuning for core2 is possible.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37367