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Date: Mon, 18 Jul 2005 17:22:00 -0000
From: "emailwastefilter-bugzillagccorg at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20050718171941.22551.emailwastefilter-bugzillagccorg@yahoo.com>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c++/22551] New: [ICE] in tree_low_cst, at tree.c:3843
X-Bugzilla-Reason: CC
X-SW-Source: 2005-07/txt/msg02248.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

This code was distilled from debian source pose_3.5-7.dsc (The Palm OS Emulator).

The bug manifests after a number of "warning: overflow in implicit constant
conversion" and then "internal compiler error: in tree_low_cst, at tree.c:3843".
 There must be at least 5 warnings or the ICE does not appear.

This Debian sid on an AMD64.  g++-3.4 (gcc version 3.4.5 20050706 (prerelease)
(Debian 3.4.4-5)) does NOT exhibit this bug.

command line:
$ g++-4.0 -c testcase.cpp

output:
testcase.cpp: In function 'int main(value_type)':
testcase.cpp:12: warning: overflow in implicit constant conversion
testcase.cpp:13: warning: overflow in implicit constant conversion
testcase.cpp:14: warning: overflow in implicit constant conversion
testcase.cpp:15: warning: overflow in implicit constant conversion
testcase.cpp:16: warning: overflow in implicit constant conversion
testcase.cpp:10: internal compiler error: in tree_low_cst, at tree.c:3843
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
For Debian GNU/Linux specific bug reporting instructions,
see <URL:file:///usr/share/doc/gcc-4.0/README.Bugs>.

--testcase.cpp--
typedef int value_type;
const value_type b = 0x80000000;
const value_type e1 = b + 1;
const value_type e2 = b + 2;
const value_type e3 = b + 3;
const value_type e4 = b + 4;
const value_type e5 = b + 5;
int main (value_type error)
{
  switch (error)
  {
   case e1: return 0;
   case e2: return 0;
   case e3: return 0;
   case e4: return 0;
   case e5: return 0;
 }
}
--testcase.cpp--

gcc -v:
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v
--enable-languages=c,c++,java,f95,objc,ada,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib --enable-nls
--without-included-gettext --enable-threads=posix --program-suffix=-4.0
--enable-__cxa_atexit --enable-libstdcxx-allocator=mt --enable-clocale=gnu
--enable-libstdcxx-debug --enable-java-gc=boehm --enable-java-awt=gtk-default
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-4.0-1.4.2.0/jre --enable-mpfr
--disable-werror --enable-checking=release x86_64-linux-gnu
Thread model: posix
gcc version 4.0.1 (Debian 4.0.1-2)

-- 
           Summary: [ICE] in tree_low_cst, at tree.c:3843
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: emailwastefilter-bugzillagccorg at yahoo dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22551