[PATCH] D14748: bmiintrin.h: Allow using the tzcnt intrinsics for non-BMI targets

[Nico Weber via cfe-commits]

thakis added a comment.

Looks good. The reasoning is that without this, projects will put in an `#if __clang__ no tzcnt` path (e.g. http://ffmpeg.org/pipermail/ffmpeg-devel/2015-November/183408.html), and with this patch they won't and in a few years when people use build flags that allow BMI instructions, we'll magically start doing the fast thing.

(This is Eric's thing, but he sounded fine with this approach on IRC yesterday.)


http://reviews.llvm.org/D14748