* Copyright (c) 1992 The Regents of the University of California.
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
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* documentation and/or other materials provided with the distribution.
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* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
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* may be used to endorse or promote products derived from this software
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* @(#)quad.h 5.9 (Berkeley) 7/28/92
* This library makes the following assumptions:
* - The type long long (aka quad_t) exists.
* - A quad variable is exactly twice as long as `long'.
* - The machine's arithmetic is two's complement.
* This library can provide 128-bit arithmetic on a machine with 128-bit
* quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
#include <machine/endian.h>
* Depending on the desired operation, we view a `long long' (aka quad_t) in
* one or more of the following formats.
quad_t q
; /* as a (signed) quad */
quad_t uq
; /* as an unsigned quad */
long sl
[2]; /* as two signed longs */
u_long ul
[2]; /* as two unsigned longs */
* Define high and low longwords.
* Total number of bits in a quad_t and in the pieces that make it up.
* These are used for shifting, and also below for halfword extraction
#define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
#define LONG_BITS (sizeof(long) * CHAR_BIT)
#define HALF_BITS (sizeof(long) * CHAR_BIT / 2)
* Extract high and low shortwords from longword, and move low shortword of
* longword to upper half of long, i.e., produce the upper longword of
* ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
* These are used in the multiply code, to split a longword into upper
* and lower halves, and to reassemble a product as a quad_t, shifted left
* (sizeof(long)*CHAR_BIT/2).
#define HHALF(x) ((x) >> HALF_BITS)
#define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
#define LHUP(x) ((x) << HALF_BITS)
extern u_quad_t __qdivrem
__P((u_quad_t u
, u_quad_t v
, u_quad_t
*rem
));
* Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
* as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
typedef unsigned int qshift_t
;
typedef u_quad_t qshift_t
;