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[Bug target/38824] [4.4 Regression] performance regression of sse code from 4.2/4.3
- From: "hubicka at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Feb 2009 12:36:39 -0000
- Subject: [Bug target/38824] [4.4 Regression] performance regression of sse code from 4.2/4.3
- References: <bug-38824-12873@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #15 from hubicka at gcc dot gnu dot org 2009-02-08 12:36 -------
I tested the patch on SPECfp and core and there is not much difference. I
guess without somehow tweaking regalloc there is not much to do about this
problem. Xuepeng, if the testcase is core2-variant sensitive, perhaps it is not
related to uops count at all? It seems to me that the bottleneck should lie
elsewhere anyway, as the testcase should be memory bound after all...
Honza
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38824