/* k_cosf.c -- float version of k_cos.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: k_cosf.c,v 1.4 1995/05/10 20:46:23 jtc Exp $";

#endif

#include <math.h>

#include <math_private.h>

static const float

one =  1.0000000000e+00, /* 0x3f800000 */

C1  =  4.1666667908e-02, /* 0x3d2aaaab */

C2  = -1.3888889225e-03, /* 0xbab60b61 */

C3  =  2.4801587642e-05, /* 0x37d00d01 */

C4  = -2.7557314297e-07, /* 0xb493f27c */

C5  =  2.0875723372e-09, /* 0x310f74f6 */

C6  = -1.1359647598e-11; /* 0xad47d74e */

float __kernel_cosf(float x, float y)

{

	float a,hz,z,r,qx;

	int32_t ix;

	GET_FLOAT_WORD(ix,x);

	ix &= 0x7fffffff;			/* ix = |x|'s high word*/

	if(ix<0x32000000) {			/* if x < 2**27 */

	    if(((int)x)==0) return one;		/* generate inexact */

	}

	z  = x*x;

	r  = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*C6)))));

	if(ix < 0x3e99999a) 			/* if |x| < 0.3 */

	    return one - ((float)0.5*z - (z*r - x*y));

	else {

	    if(ix > 0x3f480000) {		/* x > 0.78125 */

		qx = (float)0.28125;

	    } else {

	        SET_FLOAT_WORD(qx,ix-0x01000000);	/* x/4 */

	    }

	    hz = (float)0.5*z-qx;

	    a  = one-qx;

	    return a - (hz - (z*r-x*y));

	}

}