2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
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36 #ifndef _LIBKERN_QUAD_H_
37 #define _LIBKERN_QUAD_H_
42 * This library makes the following assumptions:
44 * - The type long long (aka quad_t) exists.
46 * - A quad variable is exactly twice as long as `long'.
48 * - The machine's arithmetic is two's complement.
50 * This library can provide 128-bit arithmetic on a machine with 128-bit
51 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
55 #include <sys/types.h>
56 #include <sys/limits.h>
57 #include <sys/syslimits.h>
60 * Depending on the desired operation, we view a `long long' (aka quad_t) in
61 * one or more of the following formats.
64 quad_t q; /* as a (signed) quad */
65 quad_t uq; /* as an unsigned quad */
66 long sl[2]; /* as two signed longs */
67 u_long ul[2]; /* as two unsigned longs */
71 * Define high and low longwords.
73 #define H _QUAD_HIGHWORD
74 #define L _QUAD_LOWWORD
77 * Total number of bits in a quad_t and in the pieces that make it up.
78 * These are used for shifting, and also below for halfword extraction
81 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
82 #define LONG_BITS (sizeof(long) * CHAR_BIT)
83 #define HALF_BITS (sizeof(long) * CHAR_BIT / 2)
86 * Extract high and low shortwords from longword, and move low shortword of
87 * longword to upper half of long, i.e., produce the upper longword of
88 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
90 * These are used in the multiply code, to split a longword into upper
91 * and lower halves, and to reassemble a product as a quad_t, shifted left
92 * (sizeof(long)*CHAR_BIT/2).
94 #define HHALF(x) ((x) >> HALF_BITS)
95 #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
96 #define LHUP(x) ((x) << HALF_BITS)
98 typedef unsigned int qshift_t;
100 quad_t __ashldi3(quad_t, qshift_t);
101 quad_t __ashrdi3(quad_t, qshift_t);
102 int __cmpdi2(quad_t a, quad_t b);
103 quad_t __divdi3(quad_t a, quad_t b);
104 quad_t __divmoddi4(quad_t a, quad_t b, quad_t *rem);
105 quad_t __lshrdi3(quad_t, qshift_t);
106 quad_t __moddi3(quad_t a, quad_t b);
107 u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
108 u_quad_t __udivdi3(u_quad_t a, u_quad_t b);
109 u_quad_t __udivmoddi4(u_quad_t a, u_quad_t b, u_quad_t *rem);
110 u_quad_t __umoddi3(u_quad_t a, u_quad_t b);
111 int __ucmpdi2(u_quad_t a, u_quad_t b);
113 /* ARM EABI support functions. */
115 int __aeabi_ulcmp(unsigned long long, unsigned long long);
118 #endif /* !_LIBKERN_QUAD_H_ */