1 //========================================================================
5 // Part of the standard mathematical function library
7 //========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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 version.
17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 // You should have received a copy of the GNU General Public License along
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 // As a special exception, if other files instantiate templates or use macros
27 // or inline functions from this file, or you compile this file and link it
28 // with other works to produce a work based on this file, this file does not
29 // by itself cause the resulting work to be covered by the GNU General Public
30 // License. However the source code for this file must still be made available
31 // in accordance with section (3) of the GNU General Public License.
33 // This exception does not invalidate any other reasons why a work based on
34 // this file might be covered by the GNU General Public License.
36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37 // at http://sources.redhat.com/ecos/ecos-license/
38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //========================================================================
41 //#####DESCRIPTIONBEGIN####
43 // Author(s): jlarmour
44 // Contributors: jlarmour
50 //####DESCRIPTIONEND####
52 //========================================================================
56 #include <pkgconf/libm.h> // Configuration header
58 // Include the Math library?
61 // Derived from code with the following copyright
65 /* @(#)w_pow.c 1.3 95/01/18 */
67 * ====================================================
68 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
70 * Developed at SunSoft, a Sun Microsystems, Inc. business.
71 * Permission to use, copy, modify, and distribute this
72 * software is freely granted, provided that this notice
74 * ====================================================
78 * wrapper pow(x,y) return x**y
81 #include "mathincl/fdlibm.h"
84 double pow(double x, double y) /* wrapper pow */
86 #ifdef CYGSEM_LIBM_COMPAT_IEEE_ONLY
87 return __ieee754_pow(x,y);
91 if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_IEEE||
96 return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
102 return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
104 return __kernel_standard(x,y,23); /* pow(0.0,negative) */
108 if(finite(x)&&finite(y)) {
110 return __kernel_standard(x,y,24);/* pow neg**non-int */
112 return __kernel_standard(x,y,21); /* pow overflow */
115 if(z==0.0&&finite(x)&&finite(y))
116 return __kernel_standard(x,y,22); /* pow underflow */
121 #endif // ifdef CYGPKG_LIBM