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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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