From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-382688-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 3794 invoked by alias); 6 Feb 2012 18:20:51 -0000
Received: (qmail 3778 invoked by uid 22791); 6 Feb 2012 18:20:49 -0000
X-SWARE-Spam-Status: No, hits=-2.8 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,TW_FC
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 06 Feb 2012 18:20:37 +0000
From: "gonnet at maths dot ox.ac.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/52138] New: Operations on complex values are not inlined, even with -O3
Date: Mon, 06 Feb 2012 18:20:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Keywords:
X-Bugzilla-Severity: major
X-Bugzilla-Who: gonnet at maths dot ox.ac.uk
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-52138-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
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: 2012-02/txt/msg00622.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52138

             Bug #: 52138
           Summary: Operations on complex values are not inlined, even
                    with -O3
    Classification: Unclassified
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gonnet@maths.ox.ac.uk


Irrespective of the optimization level selected, multiplying or dividing two
complex doubles generates a call to __muldc3 or __divdc3 respectively.

Using the "-fcx-limited-range" flag inlines the operations, but then the range
may be limited.

Strangely enough, in the gfortran frontend, complex arithmetic is inlined even
with no optimization (-O0).