1.5.24: sin() bug

[Dmitry Karasik <dmitry at karasik dot eu dot org>]

Hello,

I'd like to submit a bug in cygwin implementation of sin().
The following simple program demonstrates this:


#include <math.h>
#include <stdio.h>
int main( int argc, char ** argv)
{
	double g = (double) 3.1415926535897900074;
	printf("sin(%.10g)=%.10g\n", g, sin(g));
}

output is :

sin(3.141592654)=3.231089149e-15

whereas all other sin() implementation I could find ( freebsd, linux, msvc)
report this:

sin(3.141592654)=3.231085104e-015

the difference is in 7th digit, and is significant for double precision.

Please find attached cygcheck.out .


-- 
Sincerely,
	Dmitry Karasik

Attachment: cygcheck.out
Description: Text document

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