/* s_tanf.c -- float version of s_tan.c.

 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.

 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

#if defined(LIBM_SCCS) && !defined(lint)

static char rcsid[] = "$NetBSD: s_tanf.c,v 1.4 1995/05/10 20:48:20 jtc Exp $";

#endif

#include <errno.h>

#include <math.h>

#include <math_private.h>

#include <libm-alias-float.h>

float __tanf(float x)

{

	float y[2],z=0.0;

	int32_t n, ix;

	GET_FLOAT_WORD(ix,x);

    /* |x| ~< pi/4 */

	ix &= 0x7fffffff;

	if(ix <= 0x3f490fda) return __kernel_tanf(x,z,1);

    /* tan(Inf or NaN) is NaN */

	else if (ix>=0x7f800000) {

	  if (ix==0x7f800000)

	    __set_errno (EDOM);

	  return x-x;		/* NaN */

	}

    /* argument reduction needed */

	else {

	    n = __ieee754_rem_pio2f(x,y);

	    return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /*   1 -- n even

							      -1 -- n odd */

	}

}

libm_alias_float (__tan, tan)