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From: "aj at suse dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug math/13940] acos returns wrong value
Date: Tue, 03 Apr 2012 07:38:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13940

Andreas Jaeger <aj at suse dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |aj at suse dot de
         Resolution|                            |WORKSFORME

--- Comment #1 from Andreas Jaeger <aj at suse dot de> 2012-04-03 07:37:58 UTC ---
I just wrote a short test program to confirm that the test we have in the math
testsuite for acos(-1) is working:

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

int
main (void)
{
  float f;
  double d;
  long double ld;

  f = acosf (-1.0f);
  d = acos (-1.0);
  ld = acosl (-1.0);

  printf ("float %f\n", f);
  printf ("double %f\n", d);
  printf ("long double %Lf\n", ld);

  return 0;
}

It returns on my glibc 2.15 system:

aj@byrd:/tmp> gcc -Wall -lm t.c
aj@byrd:/tmp> ./a.out 
float 3.141593
double 3.141593
long double 3.141593

So, everything is fine.

If it does not work for you, please attach a short selfcontained test case and
example output.

Closing as WORKSFORME - feel free to reopen if you have additional data.

The issue mentioned in libc-help is something different and as Carlos said, it
needs a separate bug report.

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