[Bug tree-optimization/18589] could optimize FP multiplies better

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18589

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |rguenth at gcc dot gnu.org,
                   |                            |wschmidt at gcc dot gnu.org

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-09 12:20:31 UTC ---
Yeah, reassoc does not canonicalize to pow () so the tree level optimal
expansion does not trigger [in reality reassoc should probably do both
on-the-fly - linearly expand existing pow()s to expose them to multiply
chains and sorting, combine them back and then emit them in optimal form].

Bill, something you want to tackle?

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