linux-kernel - Re: [RFC][PATCH 0/3] gcc work-around and math128

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Message-ID: <4F96E154.2060100@zytor.com>
Date:	Tue, 24 Apr 2012 10:22:28 -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>
Subject: Re: [RFC][PATCH 0/3] gcc work-around and math128

On 04/24/2012 09:10 AM, Peter Zijlstra wrote:
> 
> So far its just mult, add and cmp for u128, no divisions quite yet. I realize
> that on 32bit archs mult_u128 will result in like 8 multiplication
> instructions that's still nowhere near the most expensive thing ever.
> 

Please add shifts, at the very least.

	-hpa

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