2 * SPDX-License-Identifier: BSD-3-Clause
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35 * @(#)quad.h 8.1 (Berkeley) 6/4/93
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>
59 * Depending on the desired operation, we view a `long long' (aka quad_t) in
60 * one or more of the following formats.
63 quad_t q; /* as a (signed) quad */
64 quad_t uq; /* as an unsigned quad */
65 long sl[2]; /* as two signed longs */
66 u_long ul[2]; /* as two unsigned longs */
70 * Define high and low longwords.
72 #define H _QUAD_HIGHWORD
73 #define L _QUAD_LOWWORD
76 * Total number of bits in a quad_t and in the pieces that make it up.
77 * These are used for shifting, and also below for halfword extraction
80 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
81 #define LONG_BITS (sizeof(long) * CHAR_BIT)
82 #define HALF_BITS (sizeof(long) * CHAR_BIT / 2)
85 * Extract high and low shortwords from longword, and move low shortword of
86 * longword to upper half of long, i.e., produce the upper longword of
87 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
89 * These are used in the multiply code, to split a longword into upper
90 * and lower halves, and to reassemble a product as a quad_t, shifted left
91 * (sizeof(long)*CHAR_BIT/2).
93 #define HHALF(x) ((x) >> HALF_BITS)
94 #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
95 #define LHUP(x) ((x) << HALF_BITS)
97 int __cmpdi2(quad_t a, quad_t b);
98 quad_t __divdi3(quad_t a, quad_t b);
99 quad_t __moddi3(quad_t a, quad_t b);
100 u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem);
101 int __ucmpdi2(u_quad_t a, u_quad_t b);
102 u_quad_t __udivdi3(u_quad_t a, u_quad_t b);
103 u_quad_t __umoddi3(u_quad_t a, u_quad_t b);
105 typedef unsigned int qshift_t;