lib/libc/amd64/_fpmath.h

   1 /*-
   2  * Copyright (c) 2002, 2003 David Schultz <dschultz@uclink.Berkeley.EDU>
   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 1.4 2004/01/18 07:57:01 das Exp $
  27  * $DragonFly: src/lib/libc/amd64/_fpmath.h,v 1.1 2004/02/02 05:43:14 dillon Exp $
  28  */
  29
  30 union IEEEl2bits {
  31         long double     e;
  32         struct {
  33                 unsigned int    manl    :32;
  34                 unsigned int    manh    :32;
  35                 unsigned int    exp     :15;
  36                 unsigned int    sign    :1;
  37                 unsigned int    junkl   :16;
  38                 unsigned int    junkh   :32;
  39         } bits;
  40 };
  41
  42 #define mask_nbit_l(u)  ((u).bits.manh &= 0x7fffffff)
  43
  44 #define LDBL_MANH_SIZE  32
  45 #define LDBL_MANL_SIZE  32
  46
  47 #define LDBL_TO_ARRAY32(u, a) do {                      \
  48         (a)[0] = (uint32_t)(u).bits.manl;               \
  49         (a)[1] = (uint32_t)(u).bits.manh;               \
  50 } while(0)