gcc 4.7: -march=corei7-avx bug?

Thu, 29 Mar 2012 00:54:21 -0700 

        I tried to compile Firefox 11 with gcc 4.7 optimized with:

-O3 -march=corei7-avx (I have a core i7 2700k)

        But Firefox segfaults (backtrace provided, although it seems
not very useful):

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52762

        If I compile with -march=corei7 it runs perfectly.

        Maybe a gcc bug?

        How can I help you to debug this?

        Thanks!

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Linux 3.3.0: Saber-toothed Squirrel
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