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

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Message-ID: <4F972321.4010009@zytor.com>
Date:	Tue, 24 Apr 2012 15:03:13 -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 03:00 PM, Peter Zijlstra wrote:
> 
> I haven't been able to make add_u128 generate sane code using __int128,
> the conversion between my struct and the __int128 layout makes a horrid
> mess.
> 

Use a union, or define your type simply as __int128 if you're on a
suitable platform?

	-hpa

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