linux-kernel - Re: gcc feature request / RFC: extra clobbered regs

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Message-ID: <55930D24.4040105@zytor.com>
Date:	Tue, 30 Jun 2015 14:41:56 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jakub Jelinek <jakub@...hat.com>, Andy Lutomirski <luto@...nel.org>
CC:	gcc@....gnu.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vladimir Makarov <vmakarov@...hat.com>
Subject: Re: gcc feature request / RFC: extra clobbered regs

On 06/30/2015 02:37 PM, Jakub Jelinek wrote:
> I'd say the most natural API for this would be to allow
> f{fixed,call-{used,saved}}-REG in target attribute.

Either that or

	__attribute__((fixed(rbp,rcx),used(rax,rbx),saved(r11)))

... just to be shorter.  Either way, I would consider this to be
desirable -- I have myself used this to good effect in a past life
(*cough* Transmeta *cough*) -- but not a high priority feature.

	-hpa


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