gcc 4.7: -march=corei7-avx bug?

[Dâniel Fraga]

	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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