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[Bug tree-optimization/42286] October 23rd change to tree-ssa-pre.c breaks calculix on powerpc with -ffast-math
- 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: 5 Jan 2010 15:50:20 -0000
- Subject: [Bug tree-optimization/42286] October 23rd change to tree-ssa-pre.c breaks calculix on powerpc with -ffast-math
- References: <bug-42286-15150@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #6 from rguenth at gcc dot gnu dot org 2010-01-05 15:50 -------
IIRC the problem is that using fma causes the -0 argument for fsqrt (which
behaves 100% correct). Thus a more sensible fix would be to do the 0+ on
the fma result.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42286