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/* See the import.pl script for potential modifications */
/* k_cosf.c -- Simple version of k_cos.c
* Conversion to Simple 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 1.4f 1995/05/10 20:46:23 jtc Exp $";
#endif
#include "SMath.h"
#include "math_private.h"
namespace streflop_libm {
#ifdef __STDC__
static const Simple
#else
static Simple
#endif
one = 1.0000000000e+00f, /* 0x3f800000 */
C1 = 4.1666667908e-02f, /* 0x3d2aaaab */
C2 = -1.3888889225e-03f, /* 0xbab60b61 */
C3 = 2.4801587642e-05f, /* 0x37d00d01 */
C4 = -2.7557314297e-07f, /* 0xb493f27c */
C5 = 2.0875723372e-09f, /* 0x310f74f6 */
C6 = -1.1359647598e-11f; /* 0xad47d74e */
#ifdef __STDC__
Simple __kernel_cosf(Simple x, Simple y)
#else
Simple __kernel_cosf(x, y)
Simple x,y;
#endif
{
Simple 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| < 0.3f */
return one - ((Simple)0.5f*z - (z*r - x*y));
else {
if(ix > 0x3f480000) { /* x > 0.78125f */
qx = (Simple)0.28125f;
} else {
SET_FLOAT_WORD(qx,ix-0x01000000); /* x/4 */
}
hz = (Simple)0.5f*z-qx;
a = one-qx;
return a - (hz - (z*r-x*y));
}
}
}
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