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5 * This software was developed by the Computer Systems Engineering group
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37 * @(#)quad.h 8.1 (Berkeley) 6/4/93
38 * $FreeBSD: src/lib/libc/quad/quad.h,v 1.5 1999/08/28 00:00:29 peter Exp $
39 * $DragonFly: src/lib/libc/quad/quad.h,v 1.3 2003/11/12 21:21:25 eirikn Exp $
45 * This library makes the following assumptions:
47 * - The type long long (aka quad_t) exists.
49 * - A quad variable is exactly twice as long as `long'.
51 * - The machine's arithmetic is two's complement.
53 * This library can provide 128-bit arithmetic on a machine with 128-bit
54 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
58 #include <sys/types.h>
62 * Depending on the desired operation, we view a `long long' (aka quad_t) in
63 * one or more of the following formats.
66 quad_t q
; /* as a (signed) quad */
67 quad_t uq
; /* as an unsigned quad */
68 long sl
[2]; /* as two signed longs */
69 u_long ul
[2]; /* as two unsigned longs */
73 * Define high and low longwords.
75 #define H _QUAD_HIGHWORD
76 #define L _QUAD_LOWWORD
79 * Total number of bits in a quad_t and in the pieces that make it up.
80 * These are used for shifting, and also below for halfword extraction
83 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
84 #define LONG_BITS (sizeof(long) * CHAR_BIT)
85 #define HALF_BITS (sizeof(long) * CHAR_BIT / 2)
88 * Extract high and low shortwords from longword, and move low shortword of
89 * longword to upper half of long, i.e., produce the upper longword of
90 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
92 * These are used in the multiply code, to split a longword into upper
93 * and lower halves, and to reassemble a product as a quad_t, shifted left
94 * (sizeof(long)*CHAR_BIT/2).
96 #define HHALF(x) ((x) >> HALF_BITS)
97 #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
98 #define LHUP(x) ((x) << HALF_BITS)
100 quad_t
__divdi3 (quad_t a
, quad_t b
);
101 quad_t
__moddi3 (quad_t a
, quad_t b
);
102 u_quad_t
__qdivrem (u_quad_t u
, u_quad_t v
, u_quad_t
*rem
);
103 u_quad_t
__udivdi3 (u_quad_t a
, u_quad_t b
);
104 u_quad_t
__umoddi3 (u_quad_t a
, u_quad_t b
);
108 * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
109 * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
113 typedef unsigned int qshift_t
;
115 typedef u_quad_t qshift_t
;