linux-kernel - Re: [RFC][PATCH 3/3] math128, x86_64: Implement {mult,add}

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Message-ID: <4F96E0EB.7030904@zytor.com>
Date:	Tue, 24 Apr 2012 10:20:43 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Juri Lelli <juri.lelli@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 3/3] math128, x86_64: Implement {mult,add}_u128 in
 64bit asm

On 04/24/2012 10:19 AM, Peter Zijlstra wrote:
>>
>> Yes, but this is specific to x86-64.  If gcc can generate the code it
>> can also schedule the code, which it can't for assembly...
> 
> Ok, but are you sure unsigned __int128 works for all gcc versions we
> support?
> 

I have been told __int128 works for all versions of gcc which support
x86-64, but I haven't verified it myself, no.

	-hpa
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