OpenBSD-4.6/lib/libm/arch/amd64/s_tan.S

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/*	$OpenBSD: s_tan.S,v 1.2 2005/08/02 11:17:31 espie Exp $ */
/*
 * Written by J.T. Conklin <jtc@NetBSD.org>.
 * Public domain.
 */

#include <machine/asm.h>

#include "abi.h"

ENTRY(tan)
	XMM_ONE_ARG_DOUBLE_PROLOGUE
	fldl	ARG_DOUBLE_ONE
	fptan
	fnstsw	%ax
	andw	$0x400,%ax
	jnz	1f
	fstp	%st(0)
	XMM_DOUBLE_EPILOGUE
	ret
1:	fldpi
	fadd	%st(0)
	fxch	%st(1)
2:	fprem1
	fstsw	%ax
	andw	$0x400,%ax
	jnz	2b
	fstp	%st(1)
	fptan
	fstp	%st(0)
	XMM_DOUBLE_EPILOGUE
	ret