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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/63661] [4.9/5 Regression] -O2 miscompiles on OSX 10.10 Yosemite
Date: Fri, 31 Oct 2014 10:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63661

--- Comment #18 from Martin Jambor <jamborm at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #14)
> Started with r204698 , you can use -O2 -fpic -mtune=corei7 in compilers that
> don't grok -mtune=nehalem.

So it's probably mine.  I will take a look but please be patient, it
may take a week or probably two.