libm/fpmath.h

/*-
 * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
 * Copyright (c) 2002 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.
 *
 * $FreeBSD$
 */

// ANDROID changed:
// - keep only little endian variants as they're the only one supported.
// - add long double structures here instead of _fpmath.h.
// - android uses 128 bits long doubles for LP64, so the structure and macros
//   were reworked for the quad precision ieee representation.

#pragma once

#include <endian.h>

union IEEEf2bits {
  float f;
  struct {
    unsigned int man   :23;
    unsigned int exp   :8;
    unsigned int sign  :1;
  } bits;
};

#define DBL_MANH_SIZE  20
#define DBL_MANL_SIZE  32

union IEEEd2bits {
  double  d;
  struct {
    unsigned int manl  :32;
    unsigned int manh  :20;
    unsigned int exp   :11;
    unsigned int sign  :1;
  } bits;
};

#ifdef __LP64__

union IEEEl2bits {
  long double e;
  struct {
    unsigned long manl  :64;
    unsigned long manh  :48;
    unsigned int  exp   :15;
    unsigned int  sign  :1;
  } bits;
  struct {
    unsigned long manl     :64;
    unsigned long manh     :48;
    unsigned int  expsign  :16;
  } xbits;
};

#define LDBL_NBIT  0
#define LDBL_IMPLICIT_NBIT
#define mask_nbit_l(u)  ((void)0)

#define LDBL_MANH_SIZE  48
#define LDBL_MANL_SIZE  64

#define LDBL_TO_ARRAY32(u, a) do {           \
  (a)[0] = (uint32_t)(u).bits.manl;          \
  (a)[1] = (uint32_t)((u).bits.manl >> 32);  \
  (a)[2] = (uint32_t)(u).bits.manh;          \
  (a)[3] = (uint32_t)((u).bits.manh >> 32);  \
} while(0)

#endif // __LP64__