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)

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#include <stdio.h>

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

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Best regards,
Andrew Burlak.

[David Lowndes]

>This piece of code prints "Hello, World!" only once if optimizations are

enabled.
It is expected to print "Hello, World!" 2^32 times.

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]

David,
Thank you for reply.

I found that this bug was reported in VS.Net 2002:
http://groups.google.com/groups?hl=e...04%26rnum%3D10

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

"David Lowndes" <da****@mvps.org> wrote in message
news:90********************************@4ax.com...

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

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