usr/src/lib/libc/port/fp/quadint.h

   1 /*
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This software was developed by the Computer Systems Engineering group
   6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   7  * contributed to Berkeley.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      @(#)quad.h      8.1 (Berkeley) 6/4/93
  38  */
  39
  40 /*
  41  * Quad arithmetic.
  42  *
  43  * This library makes the following assumptions:
  44  *
  45  *  - The type long long aka longlong_t exists.
  46  *
  47  *  - A quad variable is exactly twice as long as `long'.
  48  *
  49  *  - The machine's arithmetic is two's complement.
  50  *
  51  * This library can provide 128-bit arithmetic on a machine with 128-bit
  52  * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
  53  * with 48-bit longs.
  54  */
  55
  56 #ifndef __QUADINT_H
  57 #define __QUADINT_H
  58
  59 #pragma ident   "%Z%%M% %I%     %E% SMI"
  60
  61 #include <sys/isa_defs.h>
  62 #include <sys/types.h>
  63 #include <limits.h>
  64
  65 #ifdef __cplusplus
  66 extern "C" {
  67 #endif
  68
  69 /*
  70  * Define the order of 32-bit words in 64-bit words.
  71  */
  72 #ifdef _LONG_LONG_LTOH
  73 #define _QUAD_HIGHWORD 1
  74 #define _QUAD_LOWWORD 0
  75 #else
  76 #define _QUAD_HIGHWORD 0
  77 #define _QUAD_LOWWORD 1
  78 #endif
  79
  80 /*
  81  * Depending on the desired operation, we view a `long long' in
  82  * one or more of the following formats.
  83  */
  84 union uu {
  85         longlong_t      q;              /* as a (signed) quad */
  86         u_longlong_t    uq;             /* as an unsigned quad */
  87         long            sl[2];          /* as two signed longs */
  88         ulong_t         ul[2];          /* as two unsigned longs */
  89 };
  90
  91 /*
  92  * Define high and low longwords.
  93  */
  94 #define H               _QUAD_HIGHWORD
  95 #define L               _QUAD_LOWWORD
  96
  97 /*
  98  * Total number of bits in a longlong_t and in the pieces that make it up.
  99  * These are used for shifting, and also below for halfword extraction
 100  * and assembly.
 101  */
 102 #define QUAD_BITS       (sizeof (u_longlong_t) * CHAR_BIT)
 103 #define LONG_BITS       (sizeof (long) * CHAR_BIT)
 104 #define HALF_BITS       (sizeof (long) * CHAR_BIT / 2)
 105
 106 /*
 107  * Extract high and low shortwords from longword, and move low shortword of
 108  * longword to upper half of long, i.e., produce the upper longword of
 109  * ((longlong_t)(x) << (number_of_bits_in_long/2)).
 110  * (`x' must actually be ulong_t.)
 111  *
 112  * These are used in the multiply code, to split a longword into upper
 113  * and lower halves, and to reassemble a product as a longlong_t, shifted left
 114  * (sizeof(long)*CHAR_BIT/2).
 115  */
 116 #define HHALF(x)        ((x) >> HALF_BITS)
 117 #define LHALF(x)        ((x) & ((1 << HALF_BITS) - 1))
 118 #define LHUP(x)         ((x) << HALF_BITS)
 119
 120 longlong_t      ___divdi3(longlong_t a, longlong_t b);
 121 longlong_t      ___moddi3(longlong_t a, longlong_t b);
 122 u_longlong_t    ___qdivrem(u_longlong_t u, u_longlong_t v, u_longlong_t *rem);
 123 u_longlong_t    ___udivdi3(u_longlong_t a, u_longlong_t b);
 124 u_longlong_t    ___umoddi3(u_longlong_t a, u_longlong_t b);
 125
 126 typedef unsigned int    qshift_t;
 127
 128 #ifdef __cplusplus
 129 }
 130 #endif
 131
 132 #endif  /* !__QUADINT_H */