Re: bug with -O2 in g++ Debian 4.0.2-9 ?
#include
using namespace std;
class Rational
{
int numerator;
int denominator;
public:
int GetNum ()
{
return numerator;
}
int GetDen ()
{
return denominator;
}
void setNum (int numer)
{
numerator = numer;
}
void setDen (int den)
{
denominator = den;
}
int gcd (int i1, int i2)
{
if (i2 == 0)
return i1;
else
return gcd (i2, i1 % i2);
}
public :
Rational (float f)
{
int denom = 1;
while (((int) f - f)!= 0)
{
f *= 10;
denom *= 10;
}
int Gcd = gcd (int (f), denom);
numerator = f / Gcd;
cout < Here is the faulty program (this kind of code is generated by
> http://www.swig.org):
>
> /// Start ///
> #include
>
> int main(void)
> {
> long long a = 0xL;
> long long b = 0;
> void ** aa=(void **)(void *)&a;
> void ** ab=(void **)(void *)&b;
> *ab = *aa;
> printf("in: %llX, out: %llX\n", a, b);
> return 0;
> }
> /// End ///
>
> The output for the following version is:
> (Debian 1:3.3.6-12) g++ in: , out:
> (Debian 1:3.3.6-12) g++ -O1 in: , out:
> (Debian 1:3.3.6-12) g++ -O2 in: , out:
> (Debian 4.0.2-9) g++in: , out:
> (Debian 4.0.2-9) g++ -O1in: , out:
> (Debian 4.0.2-9) g++ -O2in: , out: 0
>
> So there is something wrong with g++ -O2 (Debian 4.0.2-9). Is this program
> wrong
> or is this a bug ?
>
> Regards,
>
> Jerome
--
Thanks and Regards
Digvijoy Chatterjee
Please Visit http://indra/LiMS and start your Linux Journey
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Re: bug with -O2 in g++ Debian 4.0.2-9 ?
I am using g++ 4.0.2 on Suse-10
On Thu, 2006-02-23 at 15:50 +0530, Digvijoy Chatterjee wrote:
> #include
>
> using namespace std;
> class Rational
> {
>
> int numerator;
> int denominator;
> public:
> int GetNum ()
> {
> return numerator;
> }
> int GetDen ()
> {
> return denominator;
> }
> void setNum (int numer)
> {
> numerator = numer;
> }
>
> void setDen (int den)
> {
> denominator = den;
> }
>
> int gcd (int i1, int i2)
> {
> if (i2 == 0)
> return i1;
> else
> return gcd (i2, i1 % i2);
> }
> public :
> Rational (float f)
> {
> int denom = 1;
> while (((int) f - f)!= 0)
> {
> f *= 10;
> denom *= 10;
> }
> int Gcd = gcd (int (f), denom);
> numerator = f / Gcd;
> cout < denominator = denom / Gcd;
> cout<<"-"< cout < }
>
> };
>
> int
> main (int argc, char **argv)
> {
> Rational r1 = Rational (.4537f);
> }
>
>
> -
> This runs successfully with:
> g++ without any optimization ,
> but with -O or -02 or -03 the executable just hangs forever
>
>
> On Thu, 2006-02-23 at 10:56 +0100, Jerome Robert wrote:
> > Here is the faulty program (this kind of code is generated by
> > http://www.swig.org):
> >
> > /// Start ///
> > #include
> >
> > int main(void)
> > {
> > long long a = 0xL;
> > long long b = 0;
> > void ** aa=(void **)(void *)&a;
> > void ** ab=(void **)(void *)&b;
> > *ab = *aa;
> > printf("in: %llX, out: %llX\n", a, b);
> > return 0;
> > }
> > /// End ///
> >
> > The output for the following version is:
> > (Debian 1:3.3.6-12) g++ in: , out:
> > (Debian 1:3.3.6-12) g++ -O1 in: , out:
> > (Debian 1:3.3.6-12) g++ -O2 in: 7777, out:
> > (Debian 4.0.2-9) g++in: , out:
> > (Debian 4.0.2-9) g++ -O1in: , out:
> > (Debian 4.0.2-9) g++ -O2in: , out: 0
> >
> > So there is something wrong with g++ -O2 (Debian 4.0.2-9). Is this program
> > wrong
> > or is this a bug ?
> >
> > Regards,
> >
> > Jerome
--
Thanks and Regards
Digvijoy Chatterjee
Please Visit http://indra/LiMS and start your Linux Journey
CAUTION - Disclaimer *
This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely
for the use of the addressee(s). If you are not the intended recipient, please
notify the sender by e-mail and delete the original message. Further, you are
not to copy, disclose, or distribute this e-mail or its contents to any other
person and any such actions are unlawful. This e-mail may contain viruses.
Infosys has taken every reasonable precaution to minimize this risk, but is not
liable for any damage you may sustain as a result of any virus in this e-mail.
You should carry out your own virus checks before opening the e-mail or
attachment. Infosys reserves the right to monitor and review the content of all
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***INFOSYS End of Disclaimer INFOSYS***
Re: bug with -O2 in g++ Debian 4.0.2-9 ?
On Thu, 2006-02-23 at 13:54 +0100, Richard Guenther wrote: > > This runs successfully with: > > g++ without any optimization , > > but with -O or -02 or -03 the executable just hangs forever > > See PR323 - this is expected behavior. > > Richard. > What is PR323 ,is it some page in the manual /or gcc info ? Please articulate -- Thanks and Regards Digvijoy Chatterjee Please Visit http://indra/LiMS and start your Linux Journey CAUTION - Disclaimer * This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS End of Disclaimer INFOSYS***
