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95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/*
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* $Id: math_kernel_cosf.c,v 1.2 2006-01-08 12:04:23 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* PowerPC math library based in part on work by Sun Microsystems
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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*
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*
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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#ifndef _MATH_HEADERS_H
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#include "math_headers.h"
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#endif /* _MATH_HEADERS_H */
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/****************************************************************************/
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#if defined(FLOATING_POINT_SUPPORT)
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/****************************************************************************/
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static const float
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one = 1.0000000000e+00, /* 0x3f800000 */
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C1 = 4.1666667908e-02, /* 0x3d2aaaab */
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C2 = -1.3888889225e-03, /* 0xbab60b61 */
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C3 = 2.4801587642e-05, /* 0x37d00d01 */
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C4 = -2.7557314297e-07, /* 0xb493f27c */
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C5 = 2.0875723372e-09, /* 0x310f74f6 */
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C6 = -1.1359647598e-11; /* 0xad47d74e */
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float
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__kernel_cosf(float x, float y)
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{
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volatile float hz; /* prevent optimizing out of existence */
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float a,z,r,qx;
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LONG ix;
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GET_FLOAT_WORD(ix,x);
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ix &= 0x7fffffff; /* ix = |x|'s high word*/
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if(ix<0x32000000) { /* if x < 2**27 */
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if(((int)x)==0) return one; /* generate inexact */
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}
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z = x*x;
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r = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*C6)))));
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if(ix < 0x3e99999a) /* if |x| < 0.3 */
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return one - ((float)0.5*z - (z*r - x*y));
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else {
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if(ix > 0x3f480000) { /* x > 0.78125 */
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qx = (float)0.28125;
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} else {
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SET_FLOAT_WORD(qx,ix-0x01000000); /* x/4 */
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}
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hz = (float)0.5*z-qx;
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a = one-qx;
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return a - (hz - (z*r-x*y));
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}
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}
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/****************************************************************************/
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#endif /* FLOATING_POINT_SUPPORT */
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