gen.subproj/ppc.subproj/fp.h

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1992, NeXT Computer, Inc.  All rights reserved.
  23  *
  24  *      File:   libc/m98k/gen/fp.h
  25  *      Author: Derek B Clegg, NeXT Computer, Inc.
  26  *
  27  * HISTORY
  28  *  11-Nov-92  Derek B Clegg (dclegg@next.com)
  29  *      Created.
  30  *
  31  * Common definitions for floating-point numbers.
  32  */
  33
  34 /* The following definitions for for double precision IEEE format numbers. */
  35
  36 #define EXPONENT_BIAS 1023
  37
  38 #define SIGN_BITS 1
  39 #define EXPONENT_BITS 11
  40 #define FRACTION_BITS 52
  41 #define HI_FRACTION_BITS 20
  42 #define LO_FRACTION_BITS 32
  43
  44 struct double_format {
  45     unsigned sign: SIGN_BITS;
  46     unsigned exponent: EXPONENT_BITS;
  47     unsigned hi_fraction: HI_FRACTION_BITS;
  48     unsigned lo_fraction: LO_FRACTION_BITS;
  49 };
  50
  51 union dbl {
  52     struct double_format s;
  53     unsigned int u[2];
  54     double value;
  55 };
  56
  57 #define PlusInfinity    (1.0/0.0)
  58 #define MinusInfinity   (-1.0/0.0)
  59
  60 #define not_a_number(x)         ((x) != (x))
  61 #define positive_infinity(x)    ((x) == PlusInfinity)
  62 #define negative_infinity(x)    ((x) == MinusInfinity)