| 1 |
786 |
skrzyp |
//===========================================================================
|
| 2 |
|
|
//
|
| 3 |
|
|
// s_ldexp.c
|
| 4 |
|
|
//
|
| 5 |
|
|
// Part of the standard mathematical function library
|
| 6 |
|
|
//
|
| 7 |
|
|
//===========================================================================
|
| 8 |
|
|
// ####ECOSGPLCOPYRIGHTBEGIN####
|
| 9 |
|
|
// -------------------------------------------
|
| 10 |
|
|
// This file is part of eCos, the Embedded Configurable Operating System.
|
| 11 |
|
|
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
|
| 12 |
|
|
//
|
| 13 |
|
|
// eCos is free software; you can redistribute it and/or modify it under
|
| 14 |
|
|
// the terms of the GNU General Public License as published by the Free
|
| 15 |
|
|
// Software Foundation; either version 2 or (at your option) any later
|
| 16 |
|
|
// version.
|
| 17 |
|
|
//
|
| 18 |
|
|
// eCos is distributed in the hope that it will be useful, but WITHOUT
|
| 19 |
|
|
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
| 20 |
|
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
| 21 |
|
|
// for more details.
|
| 22 |
|
|
//
|
| 23 |
|
|
// You should have received a copy of the GNU General Public License
|
| 24 |
|
|
// along with eCos; if not, write to the Free Software Foundation, Inc.,
|
| 25 |
|
|
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
| 26 |
|
|
//
|
| 27 |
|
|
// As a special exception, if other files instantiate templates or use
|
| 28 |
|
|
// macros or inline functions from this file, or you compile this file
|
| 29 |
|
|
// and link it with other works to produce a work based on this file,
|
| 30 |
|
|
// this file does not by itself cause the resulting work to be covered by
|
| 31 |
|
|
// the GNU General Public License. However the source code for this file
|
| 32 |
|
|
// must still be made available in accordance with section (3) of the GNU
|
| 33 |
|
|
// General Public License v2.
|
| 34 |
|
|
//
|
| 35 |
|
|
// This exception does not invalidate any other reasons why a work based
|
| 36 |
|
|
// on this file might be covered by the GNU General Public License.
|
| 37 |
|
|
// -------------------------------------------
|
| 38 |
|
|
// ####ECOSGPLCOPYRIGHTEND####
|
| 39 |
|
|
//===========================================================================
|
| 40 |
|
|
//#####DESCRIPTIONBEGIN####
|
| 41 |
|
|
//
|
| 42 |
|
|
// Author(s): jlarmour
|
| 43 |
|
|
// Contributors: jlarmour
|
| 44 |
|
|
// Date: 1998-02-13
|
| 45 |
|
|
// Purpose:
|
| 46 |
|
|
// Description:
|
| 47 |
|
|
// Usage:
|
| 48 |
|
|
//
|
| 49 |
|
|
//####DESCRIPTIONEND####
|
| 50 |
|
|
//
|
| 51 |
|
|
//===========================================================================
|
| 52 |
|
|
|
| 53 |
|
|
// CONFIGURATION
|
| 54 |
|
|
|
| 55 |
|
|
#include <pkgconf/libm.h> // Configuration header
|
| 56 |
|
|
|
| 57 |
|
|
// Include the Math library?
|
| 58 |
|
|
#ifdef CYGPKG_LIBM
|
| 59 |
|
|
|
| 60 |
|
|
// Derived from code with the following copyright
|
| 61 |
|
|
|
| 62 |
|
|
|
| 63 |
|
|
/* @(#)s_ldexp.c 1.3 95/01/18 */
|
| 64 |
|
|
/*
|
| 65 |
|
|
* ====================================================
|
| 66 |
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
| 67 |
|
|
*
|
| 68 |
|
|
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
| 69 |
|
|
* Permission to use, copy, modify, and distribute this
|
| 70 |
|
|
* software is freely granted, provided that this notice
|
| 71 |
|
|
* is preserved.
|
| 72 |
|
|
* ====================================================
|
| 73 |
|
|
*/
|
| 74 |
|
|
|
| 75 |
|
|
#include "mathincl/fdlibm.h"
|
| 76 |
|
|
|
| 77 |
|
|
double
|
| 78 |
|
|
ldexp(double x, int exp)
|
| 79 |
|
|
{
|
| 80 |
|
|
double z;
|
| 81 |
|
|
|
| 82 |
|
|
z = scalbn(x,exp);
|
| 83 |
|
|
|
| 84 |
|
|
#ifndef CYGSEM_LIBM_COMPAT_IEEE_ONLY
|
| 85 |
|
|
if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_IEEE) return z;
|
| 86 |
|
|
if(!(finite(z)||isnan(z))&&finite(x)) {
|
| 87 |
|
|
return __kernel_standard(x,(double)exp,43); /* ldexp overflow */
|
| 88 |
|
|
}
|
| 89 |
|
|
if(z==0.0&&z!=x) {
|
| 90 |
|
|
return __kernel_standard(x,(double)exp,44); /* ldexp underflow */
|
| 91 |
|
|
}
|
| 92 |
|
|
#endif
|
| 93 |
|
|
|
| 94 |
|
|
return z;
|
| 95 |
|
|
}
|
| 96 |
|
|
|
| 97 |
|
|
#endif // ifdef CYGPKG_LIBM
|
| 98 |
|
|
|
| 99 |
|
|
// EOF s_ldexp.c
|
