lib/libc/x86_64/_fpmath.h

   1 /*-
   2  * Copyright (c) 2002, 2003 David Schultz <das@FreeBSD.ORG>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/lib/libc/amd64/_fpmath.h,v 1.7 2008/01/17 16:39:06 bde Exp $
  27  */
  28
  29 union IEEEl2bits {
  30         long double     e;
  31         struct {
  32                 unsigned int    manl    :32;
  33                 unsigned int    manh    :32;
  34                 unsigned int    exp     :15;
  35                 unsigned int    sign    :1;
  36                 unsigned int    junkl   :16;
  37                 unsigned int    junkh   :32;
  38         } bits;
  39         struct {
  40                 unsigned long   man     :64;
  41                 unsigned int    expsign :16;
  42                 unsigned long   junk    :48;
  43         } xbits;
  44 };
  45
  46 #define LDBL_NBIT       0x80000000
  47 #define mask_nbit_l(u)  ((u).bits.manh &= ~LDBL_NBIT)
  48
  49 #define LDBL_MANH_SIZE  32
  50 #define LDBL_MANL_SIZE  32
  51
  52 #define LDBL_TO_ARRAY32(u, a) do {                      \
  53         (a)[0] = (uint32_t)(u).bits.manl;               \
  54         (a)[1] = (uint32_t)(u).bits.manh;               \
  55 } while (0)