This code is undefined as the value of 32 is outside the range of the
enum.
Sent from my iPhone
On Aug 29, 2008, at 9:29, "gmorin1 at bloomberg dot net" <[EMAIL PROTECTED]
> wrote:
This is a copy of a Debian report that I made (I thought I might as
well report
it directly here too): http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496965
g++ generates bad code for this program on an amd64 machine. It
works with
fine in 64-bit and with older versions of gcc.
#include <stdlib.h>
struct MyTypes {
enum Type {
NOVALUE = 1,
VALUE = 30,
VALUE2 = 31,
VALUE3 = -3
};
static bool isValue(MyTypes::Type value);
};
bool MyTypes::isValue(MyTypes::Type value)
{
switch (value) {
case MyTypes::VALUE:
case MyTypes::VALUE2:
case MyTypes::VALUE3: {
return true;
}
default: {
return false;
}
}
}
int main(int argc, char *argv[])
{
if (true == MyTypes::isValue(MyTypes::Type(32))) {
abort();
}
return 0;
}
[EMAIL PROTECTED]:~$ g++ -m32 -Wall -o e enumtest.cpp
[EMAIL PROTECTED]:~$ ./e
Aborted
[EMAIL PROTECTED]:~$ g++ -Wall -o e enumtest.cpp
[EMAIL PROTECTED]:~$ ./e
[EMAIL PROTECTED]:~$ g++-4.2 -m32 -Wall -o e enumtest.cpp
[EMAIL PROTECTED]:~$ ./e
[EMAIL PROTECTED]:~$ g++-4.1 -m32 -Wall -o e enumtest.cpp
[EMAIL PROTECTED]:~$ ./e
It works with -O2 though (not -O1):
[EMAIL PROTECTED]:~$ g++ -O2 -m32 -Wall -o e enumtest.cpp
[EMAIL PROTECTED]:~$ ./e
-- System Information:
Debian Release: lenny/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)
--
Summary: bad code generation with enum and -m32
Product: gcc
Version: 4.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gmorin1 at bloomberg dot net
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37281
