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[Bug middle-end/42694] Compiler could optimize pow (x, 0.75) into sqrt (x) * sqrt (sqrt (x))
- From: "rguenth 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 09:57:30 -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 #4 from rguenth at gcc dot gnu dot org 2010-01-26 09:57 -------
Ugh, I don't like more switches. Instead I would say that using two sqrt
calls instead of one pow call is always profitable if not optimizing for size
and the target has an optab for sqrt.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42694