[PATCH, libatomic]: Add config/x86/fenv.c

[Uros Bizjak <ubizjak at gmail dot com>]

On Fri, Nov 8, 2013 at 2:13 PM, Joseph S. Myers <joseph@codesourcery.com> wrote:

>> Can we introduce a target-dependant source here, in the same way as
>
> Sure, that seems a reasonable thing to do.  I think putting a file fenv.c
> in an appropriate subdirectory of libatomic/config will result in it being
> found automatically by the existing search path logic, but you'll need to
> test that.

Attached is the x86 optimized implementation of fenv.c. The source
depends as little as possible on fenv.h definitions - these are
defined by hardware, and for sure won't change soon in
hardware-dependant file.

2013-11-08  Uros Bizjak  <ubizjak@gmail.com>

    * config/x86/fenv.c: New file.

Bootstrapped and regression tested on x86_64-pc-linux-gnu {,-m32}. The
testing of atomics currently fails on 32bit target due to missing
__atomic_{load,store}_16 functions, so the patch is not adequately
tested yet.

Yes, I have tested that the libatomic's auto-configuration logic works ;)

Uros.

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