Visual C++ 2003 optimization bug

[Andrew Burlak]

This piece of code prints "Hello, World!" only once if optimizations are
enabled.
It is expected to print "Hello, World!" 2^32 times.

Optimizations: /O2
Compiler version: 13.10.3077 (VS.Net 2003)

= = = = = = = = =

#include <stdio.h>

void main(void)
{
unsigned i = 0;
do
{
printf ("Hello, World!\n");
++i;
}
while (i != 0);
}

= = = = = = = = =
Best regards,
Andrew Burlak.

[David Lowndes]

Re: Visual C++ 2003 optimization bug

>This piece of code prints "Hello, World!" only once if optimizations are[color=blue]
>enabled.
>It is expected to print "Hello, World!" 2^32 times.[/color]

Andrew,

I can repro this incorrect optimization with VS2003, but it appears to
be resolved with the current Whidbey alpha compiler.

Merry Christmas
Dave
--
MVP VC++ FAQ: http://www.mvps.org/vcfaq

[Andrew Burlak]

Re: Visual C++ 2003 optimization bug

David,
Thank you for reply.

I found that this bug was reported in VS.Net 2002:

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=%23nznY%23KDCHA.1108%40tkmsftngp04&rnum=10&prev=/groups%3Fq%3Dloop%2Boptimizer%2Bbug%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26selm%3D%2523nznY%2523KDCHA.1108%2540tkmsftngp04%26rnum%3D10

It's good news that it is already fixed in Whidbey.

"David Lowndes" <davidl@mvps.or g> wrote in message
news:90gmuvsrg6 cp7l6ob5mm0kqj0 0a71obbhs@4ax.c om...[color=blue][color=green]
> >This piece of code prints "Hello, World!" only once if optimizations are
> >enabled.
> >It is expected to print "Hello, World!" 2^32 times.[/color]
>
> Andrew,
>
> I can repro this incorrect optimization with VS2003, but it appears to
> be resolved with the current Whidbey alpha compiler.
>
> Merry Christmas
> Dave
> --
> MVP VC++ FAQ: http://www.mvps.org/vcfaq[/color]