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Date: Thu, 01 Sep 2005 00:54:00 -0000
From: "kst at mib dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20050901005347.23665.kst@mib.org>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c/23665] New: ICE in convert_move with -O3 (ok at -O2)
X-Bugzilla-Reason: CC
X-SW-Source: 2005-09/txt/msg00003.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

Note that the following code invokes undefined behavior.  I haven't been
able to reproduce this bug on platforms other than Cygwin.

% cat gcc-bug.c
double func();

int main(void)
{
    double d = func(42);
    return 0;
}

double func(double arg)
{
    return arg * 2.0;
}
% uname -a
CYGWIN_NT-5.1 sedna 1.5.18(0.132/4/2) 2005-07-02 20:30 i686 unknown unknown 
Cygwin
% gcc --version
gcc (GCC) 3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

% gcc -c -O2 gcc-bug.c
% gcc -c -O3 gcc-bug.c
gcc-bug.c: In function `main':
gcc-bug.c:10: internal compiler error: in convert_move, at expr.c:563
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

-- 
           Summary: ICE in convert_move with -O3 (ok at -O2)
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kst at mib dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-cygwin
  GCC host triplet: i686-pc-cygwin
GCC target triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23665