[Bug tree-optimization/33604] [4.3 Regression] Revision 119502 causes significantly slower results with 4.3 compared to 4.2

[jacob at math dot jussieu dot fr]

------- 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).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604