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From: "spatel at rotateright dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/60847] x86 BMI intrinsics not recognized
Date: Tue, 15 Apr 2014 16:17:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60847

Sanjay Patel <spatel at rotateright dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |c

--- Comment #3 from Sanjay Patel <spatel at rotateright dot com> ---
Here's the evidence of the extra leading underscore being the cause of the bug:

$ cat bmi.c
#include <x86intrin.h>
int foo(int a) { return __blsmsk_u32(a); }
int foo2(int a) { return __blsr_u32(a); }

$ gcc -O1 bmi.c -mbmi -S -o -
    .text
    .globl _foo
_foo:
LFB2449:
    blsmsk    %edi, %eax
    ret
LFE2449:
    .globl _foo2
_foo2:
LFB2450:
    blsr    %edi, %eax
    ret


Thanks to Craig Topper for noticing the underscore problem. Corresponding bug
in LLVM where this was first noted is here:
http://llvm.org/bugs/show_bug.cgi?id=19431