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* [Bug math/13940] New: acos returns wrong value
@ 2012-04-03 5:28 michael.blumenkrantz at gmail dot com
2012-04-03 7:38 ` [Bug math/13940] " aj at suse dot de
2014-06-25 11:23 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: michael.blumenkrantz at gmail dot com @ 2012-04-03 5:28 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13940
Bug #: 13940
Summary: acos returns wrong value
Product: glibc
Version: 2.14
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: michael.blumenkrantz@gmail.com
Classification: Unclassified
acos(-1) should return pi, but on my system it returns 0.
This is the same bug as in
http://sourceware.org/ml/libc-help/2008-09/msg00031.html
my version of glibc is 2.14.1
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* [Bug math/13940] acos returns wrong value
2012-04-03 5:28 [Bug math/13940] New: acos returns wrong value michael.blumenkrantz at gmail dot com
@ 2012-04-03 7:38 ` aj at suse dot de
2014-06-25 11:23 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: aj at suse dot de @ 2012-04-03 7:38 UTC (permalink / raw)
To: glibc-bugs
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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* [Bug math/13940] acos returns wrong value
2012-04-03 5:28 [Bug math/13940] New: acos returns wrong value michael.blumenkrantz at gmail dot com
2012-04-03 7:38 ` [Bug math/13940] " aj at suse dot de
@ 2014-06-25 11:23 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-25 11:23 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=13940
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2012-04-03 5:28 [Bug math/13940] New: acos returns wrong value michael.blumenkrantz at gmail dot com
2012-04-03 7:38 ` [Bug math/13940] " aj at suse dot de
2014-06-25 11:23 ` fweimer at redhat dot com
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