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Date: Fri, 19 Aug 2005 00:09:05 GMT
From: Haejoong Lee <haepal@gmail.com>
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Subject: i386/85101: nearbyint always returns nan
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>Number:         85101
>Category:       i386
>Synopsis:       nearbyint always returns nan
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Aug 19 00:10:15 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Haejoong Lee
>Release:        5.4-RELEASE, 5.4-RC4
>Organization:
Linguistic Data Consortium
>Environment:
FreeBSD mayor.ldc.upenn.edu 5.4-RELEASE FreeBSD 5.4-RELEASE #0: Sun May  8 10:21:06 UTC 2005     root@harlow.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
FreeBSD katz.ldc.upenn.edu 5.4-RC4 FreeBSD 5.4-RC4 #0: Tue May  3 21:41:34 EDT 2005     root@katz.ldc.upenn.edu:/usr/src/sys/i386/compile/DEVSMP  i386

>Description:
The following program prints out "nan"'s instead of some numbers.

#include <stdio.h>
#include <math.h>

int main()
{
  double x = -100.0;
  for (; x < 100.0; x+= 0.1)
    printf("%f\n", nearbyint(x));
}


I also saw this happening on 5.3-STABLE, but it didn't happen 5.4-STABLE amd64.

>How-To-Repeat:
Compile the program above and run it.
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: