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From: acme@us.ibm.com To: gcc-gnats@gcc.gnu.org Subject: c/8148: simple bit shifting does not work Date: Fri, 04 Oct 2002 12:26:00 -0000 [thread overview] Message-ID: <20021004191626.4492.qmail@sources.redhat.com> (raw) >Number: 8148 >Category: c >Synopsis: simple bit shifting does not work >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Fri Oct 04 12:26:00 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Bryan Hunt >Release: 3.2 >Organization: >Environment: System: Linux tritium.austin.ibm.com 2.4.9-34 #1 Sat Jun 1 06:25:16 EDT 2002 i686 unknown Architecture: i686 <machine, os, target, libraries (multiple lines)> host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: /home/bhunt/gcc-3.2/configure --enable-languages=c,c++ >Description: shifting a variable a number of bits greater or equal to its size produces incorrect results. This problem has been verified with both unsigned and unsigned long long. This problem has only been seen on x86 Linux. Both gcc 3.0.3 and xlC 5.0 on AIX 4.3 produces correct results. >How-To-Repeat: #include <iostream> using namespace std; int main(int argc, char* argv[]) { unsigned x = 0xffffffff; x = x << 32; if(x != 0) cout << "Bit shifting is broken: expected 0x0, but got: " << hex << x << endl; else cout << "Bit shifting works" << endl; return 0; } >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-10-04 19:26 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-10-04 12:26 acme [this message] 2002-10-04 16:05 rth
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