_fpmath-i386.h

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00001 /*-
00002  * Copyright (c) 2002, 2003 David Schultz <das@FreeBSD.ORG>
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  *
00014  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
00015  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00016  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00017  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
00018  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00019  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00020  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00021  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00022  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00023  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00024  * SUCH DAMAGE.
00025  *
00026  * $FreeBSD: src/lib/libc/i386/_fpmath.h,v 1.5 2005/03/07 04:55:22 das Exp $
00027  */
00028 
00029 union IEEEl2bits {
00030         long double     e;
00031         struct {
00032                 unsigned int    manl    :32;
00033                 unsigned int    manh    :32;
00034                 unsigned int    exp     :15;
00035                 unsigned int    sign    :1;
00036                 unsigned int    junk    :16;
00037         } bits;
00038 };
00039 
00040 #define LDBL_NBIT       0x80000000
00041 #define mask_nbit_l(u)  ((u).bits.manh &= ~LDBL_NBIT)
00042 
00043 #define LDBL_MANH_SIZE  32
00044 #define LDBL_MANL_SIZE  32
00045 
00046 #define LDBL_TO_ARRAY32(u, a) do {                      \
00047         (a)[0] = (uint32_t)(u).bits.manl;               \
00048         (a)[1] = (uint32_t)(u).bits.manh;               \
00049 } while(0)

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