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Date: Thu, 9 Sep 2010 19:43:22 -0400
From: Brian Gerst <brgerst@...il.com>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, penberg@...nel.org
Subject: Re: [PATCH 07/12] x86-64: Simplify constraints for fxsave/fxtstor
On Thu, Sep 9, 2010 at 5:22 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 09/03/2010 06:17 PM, Brian Gerst wrote:
>> Use the "R" constraint (legacy register) instead of listing all the
>> possible registers. Clean up the comments as well.
>>
>> Signed-off-by: Brian Gerst <brgerst@...il.com>
>
> Hi Brian,
>
> Have you tested this on *old* versions of gcc? Since the whole point of
> that butt-ugly code sequence is to support now-historic versions of
> binutils, we need to make sure that "R" was supposed on the
> corresponding gcc versions...
It's documented as far back as the GCC 3.1.1 manual. Whether it
actually works or not on older compilers I have no way of testing.
--
Brian Gerst
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