[PATCH] Use __builtin_bswap32/64 in __bswap_32/64 for GCC >= 4.2

[H.J. Lu]

On Fri, Apr 6, 2012 at 3:53 PM, Roland McGrath <roland@hack.frob.com> wrote:
> Please clean the file up to use __GNUC_PREREQ everywhere.
> That's much easier to follow.
>
> You're not just changing the behavior for GCC >= 4.2, which is what the log
> entry says.  You're also dropping the existing code for 2.0 <= GCC < 4.2.
> That seems questionable.  Please explain what effects this has on user code
> compiled with e.g. GCC 4.1.
>

Here is the updated patch.  I restored the code for GCC < 4.2. The patch
is also available at:

http://sourceware.org/git/?p=glibc.git;a=patch;h=9904dc47c88d9592ec66e5990754369bfde84c02

OK to install?

Thanks.

-- 
H.J.
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