From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 19933 invoked by alias); 25 Jul 2002 17:36:01 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 19912 invoked by uid 71); 25 Jul 2002 17:36:00 -0000 Resent-Date: 25 Jul 2002 17:36:00 -0000 Resent-Message-ID: <20020725173600.19911.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-To: nobody@gcc.gnu.org Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org, mark@codesourcery.com, uweigand@de.ibm.com Resent-Reply-To: gcc-gnats@gcc.gnu.org, hpenner@de.ibm.com Received: (qmail 15952 invoked by uid 61); 25 Jul 2002 17:29:35 -0000 Message-Id: <20020725172935.15951.qmail@sources.redhat.com> Date: Thu, 25 Jul 2002 10:36:00 -0000 From: hpenner@de.ibm.com Reply-To: hpenner@de.ibm.com To: gcc-gnats@gcc.gnu.org Cc: mark@codesourcery.com, uweigand@de.ibm.com X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31) X-GNATS-Notify: mark@codesourcery.com uweigand@de.ibm.com Subject: optimization/7409: loop optimization X-SW-Source: 2002-07/txt/msg00692.txt.bz2 List-Id: >Number: 7409 >Category: optimization >Synopsis: loop optimization >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Thu Jul 25 10:36:00 PDT 2002 >Closed-Date: >Last-Modified: >Originator: hpenner@de.ibm.com >Release: 3.1.1 20020725 (prerelease) >Organization: >Environment: s390x-linux-gnu >Description: loop_optimize deletes an insn, which should not be deleted. This leads to a abort of an application (tcl). Scenario: (set (reg 128) (plus (reg fp) (const_int 176))) (set (reg 6) (reg 128)) (set (reg 2) call () (expr_list (use (reg 6)))) (set (reg 96) (reg 6)) Loop optimizer thinks register 6 is in single usage, and hence delete the insn which sets register 6. This is done, since register 6 is call-saved and a parameter. Delete code in loop.c:876-909. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted: