linux-kernel - Re: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicate code

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Date:	Fri, 15 Jul 2011 16:06:50 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	"H.J. Lu" <hjl.tools@...il.com>
Subject: Re: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicate
 code

On 07/15/2011 10:24 AM, Jeremy Fitzhardinge wrote:
> 
> I posted a bug about gcc not generating cmp %ah, %al in this case, but the general consensus was that
> it's not a good choice on current Intel chips, because it causes a partial word stall, and that the
> current generated code is better.  (And gcc can generate "cmp %Xh, %Xl" if it wants to - see below.)
> 

Which version of gcc is this, and also, do you have the gcc bug report
number?  I was talking to H.J. and he said he thought it sounded strange.

	-hpa
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