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[Bug tree-optimization/42286] October 23rd change to tree-ssa-pre.c breaks calculix on powerpc with -ffast-math
- From: "meissner at linux dot vnet dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Dec 2009 21:28:14 -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 #2 from meissner at linux dot vnet dot ibm dot com 2009-12-04 21:28 -------
Subject: Re: October 23rd change to tree-ssa-pre.c breaks calculix on powerpc
with -ffast-math
On Fri, Dec 04, 2009 at 09:18:45PM -0000, rguenth at gcc dot gnu dot org wrote:
>
>
> ------- Comment #1 from rguenth at gcc dot gnu dot org 2009-12-04 21:18 -------
> This change merely turns off PRE in cold code regions. So if -fno-tree-pre
> breaks calculix for you I'd guess some later optimization manages to
> miscompile it (my guess: the vectorizer).
>
> What options do you build calculix with?
-m32 -O3 -mcpu=power5 -ffast-math
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42286