From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-219604-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 24344 invoked by alias); 28 May 2007 07:22:09 -0000
Received: (qmail 23747 invoked by uid 48); 28 May 2007 07:21:44 -0000
Date: Mon, 28 May 2007 07:22:00 -0000
Subject: [Bug tree-optimization/32120]  New: missed PRE/FRE of a*2+4 and (a+2)*2
X-Bugzilla-Reason: CC
Message-ID: <bug-32120-6528@http.gcc.gnu.org/bugzilla/>
Reply-To: gcc-bugzilla@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org
From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2007-05/txt/msg02469.txt.bz2

A testcase which we should optimize all the way to return true:
int f(int a, int b)
{
  int c = a+2;
  int d = c*2;
  int e = a*2;
  int f = e+4;
  return d == f;
}


-- 
           Summary: missed PRE/FRE of a*2+4 and (a+2)*2
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32120