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Re: [PATCH] Detect i586 and i686 features at run-time

From: Mike Frysinger <vapier at gentoo dot org>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: Joseph Myers <joseph at codesourcery dot com>, GNU C Library <libc-alpha at sourceware dot org>
Date: Wed, 19 Aug 2015 00:20:11 -0400
Subject: Re: [PATCH] Detect i586 and i686 features at run-time
Authentication-results: sourceware.org; auth=none
References: <CAMe9rOqG_SVzgUrO2DjkRZWKJfFFGE6rYqCsmUxb3dPPti=8uw at mail dot gmail dot com>

On 18 Aug 2015 11:25, H.J. Lu wrote:
> We detect i586 and i686 features at run-time by checking CX8 and CMOV
> CPUID features bits.  We can use these information to select the best
> implementation in ix86 multiarch.

there are i686's w/out cmov.  shouldn't multiarch implementations that use
certain insns be tied to those rather than a big knob like "i686" ?
-mike

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