[Bug middle-end/42961] [4.5 regression] IRA register preferencing bug

[hubicka at ucw dot cz]

------- Comment #2 from hubicka at ucw dot cz  2010-02-10 09:26 -------
Subject: Re:   New: [4.5 regression] IRA register
        preferencing bug

Hi,
note that it is related to way we compute cost through alternatives.
I had very old patch for this
http://www.x86-64.org/pipermail/patches/2001-February/001071.html
that would eventually help to remove the '#' constraints on all FP operations
that are there
to avoid RA from mixing integer and FP classes. Perhaps IRA can now do
something similar
and actually propagate the info?

Honza


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42961