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[Bug middle-end/42694] Compiler could optimize pow (x, 0.75) into sqrt (x) * sqrt (sqrt (x))
- From: "meissner at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 26 Jan 2010 00:40:35 -0000
- Subject: [Bug middle-end/42694] Compiler could optimize pow (x, 0.75) into sqrt (x) * sqrt (sqrt (x))
- References: <bug-42694-15150@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from meissner at gcc dot gnu dot org 2010-01-26 00:40 -------
Created an attachment (id=19706)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19706&action=view)
Proposed patch to fix the problem
Patch to add 3 new switches to tune whether to use a combination of sqrt/cbrt
to replace pow.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42694