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Date: Thu, 01 Sep 2005 01:42:00 -0000
From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20050901014208.23666.pinskia@gcc.gnu.org>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1)
X-Bugzilla-Reason: CC
X-SW-Source: 2005-09/txt/msg00012.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

The asm for the following two functions should be the same.
int f(int a)
{
  return 10 - ~a;
}
int f1(int a)
{
  return a + 11;
}


Found while reading LLVM's instruction combiner.

-- 
           Summary: Fold does not reduce C - ~a into a + (C+1)
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
OtherBugsDependingO 19987
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666