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[Bug tree-optimization/33604] [4.3 Regression] Revision 119502 causes significantly slower results with 4.3 compared to 4.2
- From: "paolo dot bonzini at lu dot unisi dot ch" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Nov 2007 06:12:08 -0000
- Subject: [Bug tree-optimization/33604] [4.3 Regression] Revision 119502 causes significantly slower results with 4.3 compared to 4.2
- References: <bug-33604-15171@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #22 from paolo dot bonzini at lu dot unisi dot ch 2007-11-08 06:12 -------
Subject: Re: [4.3 Regression] Revision 119502
causes significantly slower results with 4.3 compared to 4.2
jacob at math dot jussieu dot fr wrote:
> ------- Comment #21 from jacob at math dot jussieu dot fr 2007-11-07 20:58 -------
> Hi, I'm the guy behind Eigen, from which the initial testcase is taken.
>
> Would it help the compiler if I removed most of the "const" keywords in my
> code?
I'm not the expert on expression templates, but I don't think so.
"const"'s are mostly ignored by the compiler for optimization purposes,
but removing those would be bad for the users, I think.
Paolo
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604