Subversion Repositories openrisc

//===========================================================================

//

//      w_scalb.c

//

//      Part of the standard mathematical function library

//

//===========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//===========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   jlarmour

// Contributors:  jlarmour

// Date:        1998-02-13

// Purpose:     

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

//===========================================================================

// CONFIGURATION

#include <pkgconf/libm.h>   // Configuration header

// Include the Math library?

#ifdef CYGPKG_LIBM     

// Derived from code with the following copyright

/* @(#)w_scalb.c 1.3 95/01/18 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunSoft, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

/*

 * wrapper scalb(double x, double fn) is provide for

 * passing various standard test suite. One

 * should use scalbn() instead.

 */

#include "mathincl/fdlibm.h"

#ifndef CYGSEM_LIBM_COMPAT_IEEE_ONLY

# include <errno.h>

#endif

#ifdef CYGFUN_LIBM_SVID3_scalb

        double scalb(double x, double fn)       /* wrapper scalb */

#else

        double scalb(double x, int fn)          /* wrapper scalb */

#endif

{

#ifdef CYGSEM_LIBM_COMPAT_IEEE_ONLY

        return __ieee754_scalb(x,fn);

#else

        double z;

        z = __ieee754_scalb(x,fn);

        if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_IEEE) return z;

        if(!(finite(z)||isnan(z))&&finite(x)) {

            return __kernel_standard(x,(double)fn,32); /* scalb overflow */

        }

        if(z==0.0&&z!=x) {

            return __kernel_standard(x,(double)fn,33); /* scalb underflow */

        }

#ifdef CYGFUN_LIBM_SVID3_scalb

        if(!finite(fn)) errno = ERANGE;

#endif

        return z;

#endif 

}

#endif // ifdef CYGPKG_LIBM     

// EOF w_scalb.c