amd64_fpmath.h

Go to the documentation of this file.

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