linux-kernel - Re: ASM flags in general

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Message-ID: <EF5E805C-FBEE-48CB-97D1-571DC6D9BDE1@zytor.com>
Date:	Mon, 27 Jul 2015 17:35:43 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Andy Lutomirski <luto@...nel.org>,
	Uros Bizjak <uros_bizjak1@....net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Uros Bizjak <ubizjak@...il.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: ASM flags in general

However... perhaps we can do the flags stuff first?  There are certainly a ton of changes we ought to do.

On July 27, 2015 4:58:29 PM PDT, Andy Lutomirski <luto@...capital.net> wrote:
>On Mon, Jul 27, 2015 at 4:56 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> Sure... but now you have to wrap things in stac/clac.  I'm not sure I
>see the point since the code is already pretty much optimal.
>
>Ick.  I forgot about that.
>
>It would benefit all the users who aren't using the _ex functions,
>though.  And, if there are enough of those, it just might be worth
>trying to postprocess object files to collapse adjacent stac and clac
>instances, or just to teach the alternatives code to nop them out if
>they're redundant.
>
>--Andy

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