[Bug middle-end/29256] [4.3/4.4/4.5/4.6 regression] loop performance regression

[sandra at codesourcery dot com]

------- Comment #37 from sandra at codesourcery dot com  2010-07-21 04:21 -------
It seems like the change was introduced by my patch for PR42505 in r161844. 
But, it is correctly choosing the lower-cost candidate set -- the problem is in
the cost model, which was unchanged from r161843.  Take a look at the
"Use-candidate costs" section of the dump.  Those costs with negative values
(like -7) look very suspicious to me.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29256