From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from www.linux.org.uk (parcelfarce.linux.theplanet.co.uk [195.92.249.252]) by dsl2.external.hp.com (Postfix) with ESMTP id 2E11F48A4 for ; Tue, 19 Aug 2003 07:42:10 -0600 (MDT) Received: from willy by www.linux.org.uk with local (Exim 4.14) id 19p6kQ-0007Z1-Eh; Tue, 19 Aug 2003 14:42:06 +0100 Date: Tue, 19 Aug 2003 14:42:06 +0100 From: Matthew Wilcox To: Joel Soete Cc: parisc-linux@lists.parisc-linux.org, Matthew Wilcox Subject: Re: [parisc-linux] itlb miss handler optimizations! Message-ID: <20030819134206.GD19630@parcelfarce.linux.theplanet.co.uk> References: <3F2E54A800001F32@ocpmta8.freegates.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <3F2E54A800001F32@ocpmta8.freegates.net> Sender: parisc-linux-admin@lists.parisc-linux.org Errors-To: parisc-linux-admin@lists.parisc-linux.org List-Help: List-Post: List-Subscribe: , List-Id: parisc-linux developers list List-Unsubscribe: , List-Archive: On Tue, Aug 19, 2003 at 02:33:04PM +0200, Joel Soete wrote: > >On Thu, Aug 14, 2003 at 08:02:04AM +0200, Joel Soete wrote: > >> btw is it for that reason (interlock) that in your patch we can read: > >> [...] > >> cmpb,= %r0,t0,itlb_miss_... > >> nop > >> [...] > >> I am alway asking why the 'nop'. > > > >To fill the delayed branch slot (a silly idea, but ...) > > Would it be the same 'by setting the "nullify" bit' (ie cmpb,=,n ...) Only if you know which direction the branch is going. See the cmpb description. -- "It's not Hollywood. War is real, war is primarily not about defeat or victory, it is about death. I've seen thousands and thousands of dead bodies. Do you think I want to have an academic debate on this subject?" -- Robert Fisk