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
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35 * @(#)quad.h 8.1 (Berkeley) 6/4/93
38 #ifndef _LIBKERN_QUAD_H_
39 #define _LIBKERN_QUAD_H_
44 * This library makes the following assumptions:
46 * - The type long long (aka quad_t) exists.
48 * - A quad variable is exactly twice as long as `long'.
50 * - The machine's arithmetic is two's complement.
52 * This library can provide 128-bit arithmetic on a machine with 128-bit
53 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
57 #include <sys/cdefs.h>
58 #include <sys/types.h>
59 #include <sys/limits.h>
60 #include <sys/syslimits.h>
63 * Depending on the desired operation, we view a `long long' (aka quad_t) in
64 * one or more of the following formats.
67 quad_t q; /* as a (signed) quad */
68 quad_t uq; /* as an unsigned quad */
69 long sl[2]; /* as two signed longs */
70 u_long ul[2]; /* as two unsigned longs */
74 * Define high and low longwords.
76 #define H _QUAD_HIGHWORD
77 #define L _QUAD_LOWWORD
80 * Total number of bits in a quad_t and in the pieces that make it up.
81 * These are used for shifting, and also below for halfword extraction
84 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
85 #define LONG_BITS (sizeof(long) * CHAR_BIT)
86 #define HALF_BITS (sizeof(long) * CHAR_BIT / 2)
89 * Extract high and low shortwords from longword, and move low shortword of
90 * longword to upper half of long, i.e., produce the upper longword of
91 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
93 * These are used in the multiply code, to split a longword into upper
94 * and lower halves, and to reassemble a product as a quad_t, shifted left
95 * (sizeof(long)*CHAR_BIT/2).
97 #define HHALF(x) ((x) >> HALF_BITS)
98 #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
99 #define LHUP(x) ((x) << HALF_BITS)
101 typedef unsigned int qshift_t;
103 quad_t __ashldi3(quad_t, qshift_t);
104 quad_t __ashrdi3(quad_t, qshift_t);
105 int __cmpdi2(quad_t a, quad_t b);
106 quad_t __divdi3(quad_t a, quad_t b);
107 quad_t __divmoddi4(quad_t a, quad_t b, quad_t *rem);
108 quad_t __lshrdi3(quad_t, qshift_t);
109 quad_t __moddi3(quad_t a, quad_t b);
110 u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
111 u_quad_t __udivdi3(u_quad_t a, u_quad_t b);
112 u_quad_t __udivmoddi4(u_quad_t a, u_quad_t b, u_quad_t *rem);
113 u_quad_t __umoddi3(u_quad_t a, u_quad_t b);
114 int __ucmpdi2(u_quad_t a, u_quad_t b);
116 /* ARM EABI support functions. */
118 int __aeabi_ulcmp(unsigned long long, unsigned long long);
121 #endif /* !_LIBKERN_QUAD_H_ */