From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 13092 invoked by alias); 19 Feb 2003 17:06:00 -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 13044 invoked by uid 71); 19 Feb 2003 17:06:00 -0000 Resent-Date: 19 Feb 2003 17:06:00 -0000 Resent-Message-ID: <20030219170600.13040.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, lac@rgai.hu Received: (qmail 9826 invoked by uid 48); 19 Feb 2003 16:58:33 -0000 Message-Id: <20030219165833.9825.qmail@sources.redhat.com> Date: Wed, 19 Feb 2003 17:06:00 -0000 From: lac@rgai.hu Reply-To: lac@rgai.hu To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: middle-end/9759: Combine cannot do its job due to arithmetic expression evaluation order X-SW-Source: 2003-02/txt/msg00943.txt.bz2 List-Id: >Number: 9759 >Category: middle-end >Synopsis: Combine cannot do its job due to arithmetic expression evaluation order >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: pessimizes-code >Submitter-Id: net >Arrival-Date: Wed Feb 19 17:06:00 UTC 2003 >Closed-Date: >Last-Modified: >Originator: László Vidács >Release: gcc version 3.3 20030217 (prerelease) >Organization: >Environment: BUILD & HOST: Linux 2.4.20 i686 unknown TARGET: arm-unknown-elf >Description: Combine cannot combine a shift and arithmetic insn into one insn in ARM target, because there is a function call between them. Intelligent change in the evaluation order would enable Combine algorithm to produce better code. In the example the ior expression has two operands (shift expr. and function call). >How-To-Repeat: gcc -Os -S 01.c // 01.c int func2(int d) { return 12*d; } int func(int d) { return 23*func2(d); } int main() { int u; u = 0; u = (u << 8) | func(7); u = (u << 8) | func(8); return u; } >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/x-gzip; name="combine-shift.tar.gz" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="combine-shift.tar.gz" H4sIAPy2Uz4AA+2WXWvbMBSGc+tA/sNZwiApqZFkNy5tNwa96F3vdl2UWA5itmwku6zr+t8n+bNp sxbGkl3sPBAsHb2W5Nc5OibUl6MDQyghqxUZEUJodBa6K6Fhc3WE7GxEohULoyBgUeT0oZUBOfTG HJUpuQYYbYUu8+z3Op6KzTH2c2RmQGFKqL+ZTsZ1+2pdybQ8lepzH9nkWcZVDKlUoo+290hVQlKp DZu7VryYjB8nYwAtykoroOwkvpyMnwbdXhkLTpo54sWgzrhU804I4ELVZdN2VPAJyIv+vIKrKzhf wM9mrWjxjuC8E7QbqZrl//VLOSL2NZrDr/Fm/jNCuvxnZyQgdf6HK8z/Y+D5iUyF16Wz55fie+mu PJVb5THX3Kb5mqdenaK15KEQTW8JH921lLmajOvIhRV8Aa63xuXnEgqbWcKeHXUn0TwTrlmL6t6d EiIW7XhlhLnjKlcPWV7ZVjtLrbaHzzebpltpSqHB8HsBIpWZVLwUsW8lPI49bSfpftykMKN2IMvv vZ0gaybU0K6d5NruM0/zbSVafbFZWoF7WCN/9A/rn/Ye7Ldnx51X5vy5N/Qtb9x+ZbEEU9iOKbMk 9kzxYQmPiQ26gVTbtTZPbrRae110FtrAenittX/BHv+0WQ/GBu1AYAfSOBO8nq9eyhTdMoNpnWf7 LXNHfG+Z6+xY5gLHtkyHdtpXtnX/oFn0hoedLnROPb/p/PlI2PhXK4Ybc6374Z2bdbjrc7e/l143 5vmnnaMyFqr0pjfX1xcwv7n9uoDAD8CetAFhNIK59VGLVHAjFtP/qt4huxB6l+WxTKQ9RA/1IfBO /adRRPr6TwNm9SxgFOv/McD6j/Uf6//B6/+eUk+Gr4HhEwFLPoIgCIIgCIIgCIIgCIIgCPJX+AXu PFR5ACgAAA==