From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 7762 invoked by alias); 14 Feb 2006 16:39:23 -0000 Received: (qmail 7754 invoked by uid 22791); 14 Feb 2006 16:39:23 -0000 X-Spam-Check-By: sourceware.org Received: from sibelius.xs4all.nl (HELO sibelius.xs4all.nl) (82.92.89.47) by sourceware.org (qpsmtpd/0.31) with ESMTP; Tue, 14 Feb 2006 16:39:22 +0000 Received: from elgar.sibelius.xs4all.nl (root@elgar.sibelius.xs4all.nl [192.168.0.2]) by sibelius.xs4all.nl (8.13.4/8.13.4) with ESMTP id k1EGclbd027774; Tue, 14 Feb 2006 17:38:47 +0100 (CET) Received: from elgar.sibelius.xs4all.nl (kettenis@localhost.sibelius.xs4all.nl [127.0.0.1]) by elgar.sibelius.xs4all.nl (8.13.4/8.13.3) with ESMTP id k1EGckNQ003888; Tue, 14 Feb 2006 17:38:46 +0100 (CET) Received: (from kettenis@localhost) by elgar.sibelius.xs4all.nl (8.13.4/8.13.4/Submit) id k1EGckea012314; Tue, 14 Feb 2006 17:38:46 +0100 (CET) Date: Tue, 14 Feb 2006 16:39:00 -0000 Message-Id: <200602141638.k1EGckea012314@elgar.sibelius.xs4all.nl> From: Mark Kettenis To: drow@false.org CC: mark.kettenis@xs4all.nl, gdb-patches@sourceware.org, fnf@specifix.com In-reply-to: <20060214155232.GA23947@nevyn.them.org> (message from Daniel Jacobowitz on Tue, 14 Feb 2006 10:52:32 -0500) Subject: Re: Fix PR breakpoints/2080 References: <200602141545.k1EFjeGb005665@elgar.sibelius.xs4all.nl> <20060214155232.GA23947@nevyn.them.org> Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2006-02/txt/msg00304.txt.bz2 > X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on > elgar.sibelius.xs4all.nl > X-Spam-Level: > X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=no > version=3.1.0 > Date: Tue, 14 Feb 2006 10:52:32 -0500 > From: Daniel Jacobowitz > Cc: gdb-patches@sourceware.org, fnf@specifix.com > Mail-Followup-To: Mark Kettenis , > gdb-patches@sourceware.org, fnf@specifix.com > Content-Disposition: inline > X-XS4ALL-DNSBL-Checked: mxdrop9.xs4all.nl checked 66.93.172.17 against DNS blacklists > X-Virus-Scanned: by XS4ALL Virus Scanner > X-XS4ALL-Spam-Score: 0 () > X-XS4ALL-Spam: NO > Envelope-To: mark.kettenis@xs4all.nl > X-UIDL: 1139932355._smtp.mxdrop9.54361,S=1797 > > On Tue, Feb 14, 2006 at 04:45:40PM +0100, Mark Kettenis wrote: > > This fixes the testcase I checked in yesterday, so I committed it. > > FYI, GCC generates this sequence as RTL rather than text, which means > it can be scheduled and optimized. Fortunately the scheduler doesn't have a lot of room to do this. I'm pretty sure the first three instructions (which are the most important ones) are pretty much fixed with the current GCC implementation of the stack alignment. > Of course in optimized code we don't expect the prologue skipper to > work very well, and we use dwarf2 to bypass the prologue analyzer, > so this may not be a big deal. But I'm somewhat curious to see if > we could make this extremely sophisticated i386 prologue analyzer > use Jim's prologue-value.[ch] interface... Well, writing that prologue analyzer will be hell of a lot more difficult for CISC than it is for RISC; even with Jim's prologue-value.[ch]. Mark