/*
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/

 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.

 * The Original Code is Rhino code, released
 * May 6, 1999.

 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1997-1999 Netscape Communications Corporation. All
 * Rights Reserved.

 * Contributor(s): 

 * Alternatively, the contents of this file may be used under the
 * terms of the GNU Public License (the "GPL"), in which case the
 * provisions of the GPL are applicable instead of those above.
 * If you wish to allow use of your version of this file only
 * under the terms of the GPL and not to allow others to use your
 * version of this file under the NPL, indicate your decision by
 * deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL.  If you do not delete
 * the provisions above, a recipient may use your version of this
 * file under either the NPL or the GPL.
 */
#ifndef _JS_FP_CLASS_H_
#define _JS_FP_CLASS_H_

#include "js-types.h"

#ifdef TARGET_OS_LINUX
#undef isnan
#endif

/* Classes */
class JSFpClass {
    public:
        static const uint32_t   HI32_SIGNBIT = 0x80000000;
        static const uint32_t   HI32_EXPMASK = 0x7ff00000;
        static const uint32_t   HI32_MANTMASK = 0x000fffff;

    public:
        static uint32_t HI32(double d) {
            return ((uint32_t *) &d)[0];
        }
        static uint32_t LO32(double d) {
            return ((uint32_t *) &d)[1];
        }
        static int finite(double d) {
            return ((HI32(d) & HI32_EXPMASK) != HI32_EXPMASK);
        }
        static int isnan(double d) {
            return (
                (HI32(d) & HI32_EXPMASK) == HI32_EXPMASK
                && (LO32(d) || (HI32(d) & HI32_MANTMASK))
            ) ;
        }
        static  int isinfinite(double d) {
            return  ((HI32(d) & ~HI32_SIGNBIT) == HI32_EXPMASK && LO32(d) == 0);
        }
        static  int isnegzero(double d) {
            return  (HI32(d) == HI32_SIGNBIT && LO32(d) == 0);
        }
} ;

/* Macros */
#define finite(d)       JSFpClass::finite(d)
#define isnan(d)        JSFpClass::isnan(d)

#endif /* _JS_FP_CLASS_H_ */

