s_tan.S revision 1.2 
1/*	$OpenBSD: s_tan.S,v 1.2 2005/08/02 11:17:31 espie Exp $ */
2/*
3 * Written by J.T. Conklin <jtc@netbsd.org>.
4 * Public domain.
5 */
6
7#include <machine/asm.h>
8
9ENTRY(tan)
10	fldl	4(%esp)
11	fptan
12	fnstsw	%ax
13	andw	$0x400,%ax
14	jnz	1f
15	fstp	%st(0)
16	ret
171:	fldpi
18	fadd	%st(0)
19	fxch	%st(1)
202:	fprem1
21	fstsw	%ax
22	andw	$0x400,%ax
23	jnz	2b
24	fstp	%st(1)
25	fptan
26	fstp	%st(0)
27	ret
28