[Bug target/60847] [4.9/4.10 Regression] x86 BMI intrinsics not recognized

[spatel at rotateright dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60847

--- Comment #10 from Sanjay Patel <spatel at rotateright dot com> ---
Ah - thank you for the explanation! I found the original checkin from AMD:
http://gcc.gnu.org/ml/gcc-patches/2010-10/msg01356.html

Strangely, I can't find any documentation for those double-underscores from AMD
though.