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
87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/*
|
|
* $Id: math_acoshf.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.
|
|
*
|
|
*
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
|
*/
|
|
|
|
#ifndef _MATH_HEADERS_H
|
|
#include "math_headers.h"
|
|
#endif /* _MATH_HEADERS_H */
|
|
|
|
/****************************************************************************/
|
|
|
|
#if defined(FLOATING_POINT_SUPPORT)
|
|
|
|
/****************************************************************************/
|
|
|
|
static const float
|
|
one = 1.0,
|
|
ln2 = 6.9314718246e-01; /* 0x3f317218 */
|
|
|
|
float
|
|
acoshf(float x)
|
|
{
|
|
float t;
|
|
LONG hx;
|
|
GET_FLOAT_WORD(hx,x);
|
|
if(hx<0x3f800000) { /* x < 1 */
|
|
return (x-x)/(x-x);
|
|
} else if(hx >=0x4d800000) { /* x > 2**28 */
|
|
if(hx >=0x7f800000) { /* x is inf of NaN */
|
|
return x+x;
|
|
} else
|
|
return logf(x)+ln2; /* acosh(huge)=log(2x) */
|
|
} else if (hx==0x3f800000) {
|
|
return 0.0; /* acosh(1) = 0 */
|
|
} else if (hx > 0x40000000) { /* 2**28 > x > 2 */
|
|
t=x*x;
|
|
return logf((float)2.0*x-one/(x+sqrtf(t-one)));
|
|
} else { /* 1<x<2 */
|
|
t = x-one;
|
|
return log1pf(t+sqrtf((float)2.0*t+t*t));
|
|
}
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
#endif /* FLOATING_POINT_SUPPORT */
|