s_tanf.s

glibc 2.9,最新版的C语言库函数

/*
 * Written by J.T. Conklin <[e-mail]>.
 * Public domain.
 */

#include <machine/asm.h>

RCSID("$NetBSD: s_tanf.S,v 1.3 1995/05/09 00:31:09 jtc Exp $")

ENTRY(__tanf)
	flds	4(%esp)
	fptan
	fnstsw	%ax
	testl	$0x400,%eax
	jnz	1f
	fstp	%st(0)
	ret
1:	fldpi
	fadd	%st(0)
	fxch	%st(1)
2:	fprem1
	fstsw	%ax
	testl	$0x400,%eax
	jnz	2b
	fstp	%st(1)
	fptan
	fstp	%st(0)
	ret
END (__tanf)
weak_alias (__tanf, tanf)