mirror of
https://github.com/adtools/clib2.git
synced 2025-12-08 14:59:05 +00:00
7f0f7929ba
- Replaced ISO Latin 1 code #160 with a plain blank space (ASCII code #32) where necessary git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15305 87f5fb63-7c3d-0410-a384-fd976d0f7a62
91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
/*
|
|
* $Id: math_kernel_cos.c,v 1.3 2006-01-08 12:04:23 obarthel Exp $
|
|
*
|
|
* :ts=4
|
|
*
|
|
* Portable ISO 'C' (1994) runtime library for the Amiga computer
|
|
* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* - Neither the name of Olaf Barthel nor the names of contributors
|
|
* may be used to endorse or promote products derived from this
|
|
* software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*
|
|
* PowerPC math library based in part on work by Sun Microsystems
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _MATH_HEADERS_H
|
|
#include "math_headers.h"
|
|
#endif /* _MATH_HEADERS_H */
|
|
|
|
/****************************************************************************/
|
|
|
|
#if defined(FLOATING_POINT_SUPPORT) && defined(PPC_FLOATING_POINT_SUPPORT)
|
|
|
|
/****************************************************************************/
|
|
|
|
static const double
|
|
one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
|
|
C1 = 4.16666666666666019037e-02, /* 0x3FA55555, 0x5555554C */
|
|
C2 = -1.38888888888741095749e-03, /* 0xBF56C16C, 0x16C15177 */
|
|
C3 = 2.48015872894767294178e-05, /* 0x3EFA01A0, 0x19CB1590 */
|
|
C4 = -2.75573143513906633035e-07, /* 0xBE927E4F, 0x809C52AD */
|
|
C5 = 2.08757232129817482790e-09, /* 0x3E21EE9E, 0xBDB4B1C4 */
|
|
C6 = -1.13596475577881948265e-11; /* 0xBDA8FAE9, 0xBE8838D4 */
|
|
|
|
double __kernel_cos(double x, double y)
|
|
{
|
|
double a,hz,z,r,qx;
|
|
int ix;
|
|
|
|
GET_HIGH_WORD(ix,x);
|
|
ix &= 0x7fffffff; /* ix = |x|'s high word*/
|
|
if(ix<0x3e400000) { /* 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 < 0x3FD33333) /* if |x| < 0.3 */
|
|
return one - (0.5*z - (z*r - x*y));
|
|
else {
|
|
if(ix > 0x3fe90000) { /* x > 0.78125 */
|
|
qx = 0.28125;
|
|
} else {
|
|
INSERT_WORDS(qx,ix-0x00200000,0); /* x/4 */
|
|
}
|
|
hz = 0.5*z-qx;
|
|
a = one-qx;
|
|
return a - (hz - (z*r-x*y));
|
|
}
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
#endif /* FLOATING_POINT_SUPPORT && PPC_FLOATING_POINT_SUPPORT */
|