linux-kernel - Re: kernel + gcc 4.1 = several problems

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Date:	Wed, 3 Jan 2007 22:48:38 +0100
From:	Denis Vlasenko <vda.linux@...glemail.com>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Grzegorz Kulewski <kangur@...com.net>,
	Alan <alan@...rguk.ukuu.org.uk>,
	Mikael Pettersson <mikpe@...uu.se>, s0348365@....ed.ac.uk,
	76306.1226@...puserve.com, akpm@...l.org, bunk@...sta.de,
	greg@...ah.com, linux-kernel@...r.kernel.org,
	yanmin_zhang@...ux.intel.com
Subject: Re: kernel + gcc 4.1 = several problems

On Wednesday 03 January 2007 21:38, Linus Torvalds wrote:
> On Wed, 3 Jan 2007, Denis Vlasenko wrote:
> > 
> > Why CPU people do not internally convert cmov into jmp,mov pair?
> 
...
> It really all boils down to: there's simply no real reason to use cmov. 
> It's not horrible either, so go ahead and use it if you want to, but don't 
> expect your code to really magically run any faster.

IOW: yet another slot in instruction opcode matrix and thousands of
transistors in instruction decoders are wasted because of this
"clever invention", eh?
--
vda
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