From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5550 invoked by alias); 17 Jan 2003 22:33:33 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 5543 invoked from network); 17 Jan 2003 22:33:30 -0000 Received: from unknown (HELO igw2.watson.ibm.com) (129.34.20.6) by sources.redhat.com with SMTP; 17 Jan 2003 22:33:30 -0000 Received: from sp1n293en1.watson.ibm.com (sp1n293en1.watson.ibm.com [9.2.112.57]) by igw2.watson.ibm.com (8.11.4/8.11.4) with ESMTP id h0HMXLc18496; Fri, 17 Jan 2003 17:33:21 -0500 Received: from makai.watson.ibm.com (makai.watson.ibm.com [9.2.216.144]) by sp1n293en1.watson.ibm.com (8.11.4/8.11.4) with ESMTP id h0HMXL619384; Fri, 17 Jan 2003 17:33:21 -0500 Received: from watson.ibm.com (localhost [127.0.0.1]) by makai.watson.ibm.com (AIX4.3/8.9.3/8.9.3/09-18-2002) with ESMTP id RAA21978; Fri, 17 Jan 2003 17:33:20 -0500 Message-Id: <200301172233.RAA21978@makai.watson.ibm.com> To: Roger Sayle cc: gcc-patches@gcc.gnu.org Subject: Re: [PATCH] Fix RTL sharing problem in CSE References: Date: Fri, 17 Jan 2003 22:33:00 -0000 From: David Edelsohn X-SW-Source: 2003-01/txt/msg01259.txt.bz2 >>>>> Roger Sayle writes: > I believe that the problems on hppa64 and powerpc will turn out to > be more latent bugs in the existing GCSE or CSE constant propagation > code, just like the one in cse_insn that it has already uncovered > on H8300. This does appear to be the case for the PowerPC segfault. After further investigation, I can construct a simplified testcase which fails with or without the jump bypass patch. The jump bypass patch simply causes the latent bug to occur in the complete version of the function that appears in the benchmark. David