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Re: RFC: Enable multi-arch support for i386

On Mon, Aug 17, 2015 at 8:06 AM, Joseph Myers <> wrote:
> On Mon, 17 Aug 2015, H.J. Lu wrote:
>> Since _dl_x86_cpu_features is available for i386 now, we can
>> move sysdeps/i386/i686/multiarch to sysdeps/i386/multiarch.
>> That means to make multi-arch available for i486 and i586.
>> Should I post a patch to do it?
> I think the principle of having it available there makes sense.  However,
> various files in sysdeps/i386/i686/multiarch include other files from ../
> (i.e. i686 versions) or ../i486/ or ../i586/.  So you'd need to make sure
> such a change doesn't pessimize things or use unavailable instructions in
> those fallback versions - the files should include the i686/ versions if
> __i686__ is defined, etc., making sure to include the best version
> applicable to the processor for which glibc is compiled (of course i486/
> versions are always OK to use since i386 isn't supported any more).

I will detect i586/i686 at run-time and select the best one for the hardware.


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