ppc/gen/fp.h

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /* Copyright (c) 1992, NeXT Computer, Inc.  All rights reserved.
  24  *
  25  *      File:   libc/m98k/gen/fp.h
  26  *      Author: Derek B Clegg, NeXT Computer, Inc.
  27  *
  28  * HISTORY
  29  *  11-Nov-92  Derek B Clegg (dclegg@next.com)
  30  *      Created.
  31  *
  32  * Common definitions for floating-point numbers.
  33  */
  34
  35 /* The following definitions for for double precision IEEE format numbers. */
  36
  37 #define EXPONENT_BIAS 1023
  38
  39 #define SIGN_BITS 1
  40 #define EXPONENT_BITS 11
  41 #define FRACTION_BITS 52
  42 #define HI_FRACTION_BITS 20
  43 #define LO_FRACTION_BITS 32
  44
  45 struct double_format {
  46     unsigned sign: SIGN_BITS;
  47     unsigned exponent: EXPONENT_BITS;
  48     unsigned hi_fraction: HI_FRACTION_BITS;
  49     unsigned lo_fraction: LO_FRACTION_BITS;
  50 };
  51
  52 union dbl {
  53     struct double_format s;
  54     unsigned int u[2];
  55     double value;
  56 };
  57
  58 #define PlusInfinity    (1.0/0.0)
  59 #define MinusInfinity   (-1.0/0.0)
  60
  61 #define not_a_number(x)         ((x) != (x))
  62 #define positive_infinity(x)    ((x) == PlusInfinity)
  63 #define negative_infinity(x)    ((x) == MinusInfinity)