From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-111019-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 14251 invoked by alias); 20 Sep 2004 12:23:53 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
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
Received: (qmail 14093 invoked by uid 48); 20 Sep 2004 12:23:44 -0000
Date: Mon, 20 Sep 2004 12:23:00 -0000
From: "anlauf at hep dot tu-darmstadt dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20040920122341.17568.anlauf@hep.tu-darmstadt.de>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug fortran/17568] New: ISHFT intrinsic: bogus overflow error
X-Bugzilla-Reason: CC
X-SW-Source: 2004-09/txt/msg02245.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

Hi,

the following code

program gfcbug9
  implicit none
  integer, parameter :: nbits = bit_size (1)
  integer            :: res
  res = ishft (1, nbits-1)
  print *, res
end program gfcbug9


fails to compile with the error message:


 In file gfcbug9.f90:5

  res = ishft (1, nbits-1)
              1
Error: Result of ISHFT overflows its kind at (1)


This is a bug.  AFAIK all bits that drop out left or right just
should get lost.  The only constraint (abs(shift) < bit_size) is
satisfied.

Cheers,
-ha

-- 
           Summary: ISHFT intrinsic: bogus overflow error
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: anlauf at hep dot tu-darmstadt dot de
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17568