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//========================================================================
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//
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// w_pow.c
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//
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// Part of the standard mathematical function library
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//
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//========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): jlarmour
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// Contributors: jlarmour
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// Date: 1998-02-13
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// Purpose:
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// Description:
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// Usage:
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//
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//####DESCRIPTIONEND####
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//
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//========================================================================
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// CONFIGURATION
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#include <pkgconf/libm.h> // Configuration header
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// Include the Math library?
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#ifdef CYGPKG_LIBM
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// Derived from code with the following copyright
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/* @(#)w_pow.c 1.3 95/01/18 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunSoft, 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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/*
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* wrapper pow(x,y) return x**y
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*/
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#include "mathincl/fdlibm.h"
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double pow(double x, double y) /* wrapper pow */
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{
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#ifdef CYGSEM_LIBM_COMPAT_IEEE_ONLY
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return __ieee754_pow(x,y);
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#else
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double z;
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z=__ieee754_pow(x,y);
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if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_IEEE||
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isnan(y))
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return z;
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if(isnan(x)) {
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if(y==0.0)
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return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
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else
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return z;
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}
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if(x==0.0){
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if(y==0.0)
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return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
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if(finite(y)&&y<0.0)
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return __kernel_standard(x,y,23); /* pow(0.0,negative) */
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return z;
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}
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if(!finite(z)) {
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if(finite(x)&&finite(y)) {
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if(isnan(z))
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return __kernel_standard(x,y,24);/* pow neg**non-int */
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else
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return __kernel_standard(x,y,21); /* pow overflow */
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}
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}
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if(z==0.0&&finite(x)&&finite(y))
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return __kernel_standard(x,y,22); /* pow underflow */
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return z;
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#endif
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}
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#endif // ifdef CYGPKG_LIBM
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// EOF w_pow.c
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