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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: "jacob at math dot jussieu dot fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Nov 2007 20:58:32 -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 #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 am asking because of the following. As Eigen has Lvalue expression
templates(*), it is very cumbersome to enforce constness as many methods have
to be written twice, once const-qualified and once not. Therefore I have given
up enforcing constness, and am doing const_cast's at several places. Therefore
many of the "const" keywords in Eigen are rather meaningless and could be
removed.
(*) for instance the following is allowed:
matrix.row(i) += a * matrix.row(j).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604