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[Bug tree-optimization/38785] huge performance regression on EEMBC bitmnp01
- From: "Joey dot ye at intel dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Jan 2009 10:08:29 -0000
- Subject: [Bug tree-optimization/38785] huge performance regression on EEMBC bitmnp01
- References: <bug-38785-5394@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from Joey dot ye at intel dot com 2009-01-14 10:08 -------
(In reply to comment #5)
> Joern, re. comment #4, Richi refers to my patch to enable PRE at -Os, see [1].
> An extension to this patch that we tested on x86 machines, is to disable PRE
> for scalar integer registers, via SMALL_REGISTER_CLASSES. I changed
> SMALL_REGISTER_CLASSES into a target hook for this purpose, see [2]. You could
> play with this, see if you can use this to cure your problem...
> [1] http://gcc.gnu.org/ml/gcc-patches/2008-12/msg00199.html
> [2] http://gcc.gnu.org/ml/gcc-patches/2008-12/msg00590.html
Reproduced on x86. But I fail to build with patch [2] on x86_64, anything
wrong?
../../src/gcc/target-def.h:476:1: error: unterminated #ifndef
../../src/gcc/c-common.c:8197: error: 'TARGETCM_INITIALIZER' undeclared here
(not in a function)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38785