Re: Bug-glibc Digest, Vol 14, Issue 5

[RolloS]

Hi Bryn,

I tried your little test program:
>           double a=0.4;
>           double b=7.2;
>           printf("\nMax is %g, min is %g\n", fmax(a,b), fmin(a,b));

using Project Builder under Mac OS X (10.2.8, jaguar) and got the 
expected result:
Max is 7.2, min is 0.4

On Tuesday, Jan 6, 2004, at 02:49 America/Denver, 
address@hidden wrote:
[snip]
> ------------------------------
> Message: 8
> Date: Tue, 06 Jan 2004 17:03:28 +1100
> From: Bryn Jeffries <address@hidden>
> Subject:

>  and fmax odd behaviour
> To: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain
>
>
> Hi,
>
> I've had trouble using fmax and fmin. I cannot check the bugs database
> to check whether bugs have already been recorded for them as the server
> appeared to be down at the time of writing.
>
> Here is an example (fmaxtest.c):
>
>         #include <stdio.h>
>         #include <math.h>
>
>         int main(void)
>         {
>           double a=0.4;
>           double b=7.2;
>
>           printf("\nMax is %g, min is %g\n", fmax(a,b), fmin(a,b));
>
>           return 0;
>         }
>
> I am expecting to be told that Max is 7.2, min is 0.4. Instead:
>         % gcc fmaxtest.c -lm
>         % ./a.out
>
>         Max is -9.25597e+61, min is 6.64587e-316
>
> Clearly this is not what was expected. For what it's worth, I'm running
> a Fedora Core 1 system on an AMD Athlon machine. I have obtained 
> similar
> results for a Mandrake 9.2 system on another AMD Athlon system.
>         % gcc -v
>         Reading specs from
>         /usr/lib/gcc-lib/i386-redhat-linux/3.3.2/specs
>         Configured with: ../configure --prefix=/usr
>         --mandir=/usr/share/man --infodir=/usr/share/info
>         --enable-shared --enable-threads=posix --disable-checking
>         --with-system-zlib --enable-__cxa_atexit
>         --host=i386-redhat-linux
>         Thread model: posix
>         gcc version 3.3.2 20031022 (Red Hat Linux 3.3.2-1)
>
>         % rpm -q glibc
>         glibc-2.3.2-101.1
>
>         % rpm -q glibc-headers
>         glibc-headers-2.3.2-101.1
>
> Please let me know whether this is a known bug.
>
> Many thanks,
>
> Bryn
> --
> Bryn Jeffries
> Visiting Fellow
> Department of Physics
> Division of Information and Communication Sciences
> Macquarie University
> Sydney
> NSW 2109
> Australia
>
> Office: 315 E7A -=- Lab: 261 E7B
>
> Tel: +61-2-9850-7583
> Fax: +61-2-9850-8115
> ----------------------------