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From: "keefeg at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/46460] New: shifting producing incorrect result
Date: Sat, 13 Nov 2010 05:32:00 -0000 [thread overview]
Message-ID: <bug-46460-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46460
Summary: shifting producing incorrect result
Product: gcc
Version: 4.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: keefeg@gmail.com
% cat bug.c
#include <stdio.h>
int main(void) {
unsigned int ShouldBeZero;
int cnt = 32;
ShouldBeZero = 0xFFFFFFFF >> cnt;
printf("Should print 0 here: %u\n", ShouldBeZero);
return 0;
}
% cc -o bug bug.c
% ./bug
Should print 0 here: 4294967295
% cc -o bug -O3 bug.c
% ./bug
Should print 0 here: 0
% gcc -v
Using built-in specs.
Target: amd64-undermydesk-freebsd
Configured with: FreeBSD/amd64 system compiler
Thread model: posix
gcc version 4.2.1 20070719 [FreeBSD]
% sysctl -a | grep 'hw\.model'
hw.model: AMD Phenom(tm) II X4 955 Processor
next reply other threads:[~2010-11-13 1:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-13 5:32 keefeg at gmail dot com [this message]
2010-11-13 6:53 ` [Bug c/46460] " pinskia at gcc dot gnu.org
2010-11-13 15:10 ` [Bug c/46460] warn for shifting more than the bits in the (promoted) type is undefined manu at gcc dot gnu.org
2010-11-17 9:45 ` schwab@linux-m68k.org
2014-04-29 13:06 ` mpolacek at gcc dot gnu.org
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