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58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
// Copyright (c) 2010-2012, Salvatore Sanfilippo <antirez at gmail dot com>
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// SPDX-FileCopyrightText: 2024 Redict Contributors
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// SPDX-FileCopyrightText: 2024 Salvatore Sanfilippo <antirez at gmail dot com>
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//
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// SPDX-License-Identifier: BSD-3-Clause
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// SPDX-License-Identifier: LGPL-3.0-only
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#include <stdint.h>
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#define N 16
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#define MASK ((1 << (N - 1)) + (1 << (N - 1)) - 1)
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#define LOW(x) ((unsigned)(x) & MASK)
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#define HIGH(x) LOW((x) >> N)
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#define MUL(x, y, z) { int32_t l = (long)(x) * (long)(y); \
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(z)[0] = LOW(l); (z)[1] = HIGH(l); }
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#define CARRY(x, y) ((int32_t)(x) + (long)(y) > MASK)
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#define ADDEQU(x, y, z) (z = CARRY(x, (y)), x = LOW(x + (y)))
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#define X0 0x330E
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#define X1 0xABCD
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#define X2 0x1234
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#define A0 0xE66D
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#define A1 0xDEEC
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#define A2 0x5
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#define C 0xB
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#define SET3(x, x0, x1, x2) ((x)[0] = (x0), (x)[1] = (x1), (x)[2] = (x2))
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#define SETLOW(x, y, n) SET3(x, LOW((y)[n]), LOW((y)[(n)+1]), LOW((y)[(n)+2]))
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#define SEED(x0, x1, x2) (SET3(x, x0, x1, x2), SET3(a, A0, A1, A2), c = C)
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#define REST(v) for (i = 0; i < 3; i++) { xsubi[i] = x[i]; x[i] = temp[i]; } \
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return (v);
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#define HI_BIT (1L << (2 * N - 1))
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static uint32_t x[3] = { X0, X1, X2 }, a[3] = { A0, A1, A2 }, c = C;
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static void next(void);
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int32_t redictLrand48(void) {
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next();
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return (((int32_t)x[2] << (N - 1)) + (x[1] >> 1));
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}
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void redictSrand48(int32_t seedval) {
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SEED(X0, LOW(seedval), HIGH(seedval));
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}
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static void next(void) {
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uint32_t p[2], q[2], r[2], carry0, carry1;
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MUL(a[0], x[0], p);
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ADDEQU(p[0], c, carry0);
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ADDEQU(p[1], carry0, carry1);
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MUL(a[0], x[1], q);
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ADDEQU(p[1], q[0], carry0);
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MUL(a[1], x[0], r);
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x[2] = LOW(carry0 + carry1 + CARRY(p[1], r[0]) + q[1] + r[1] +
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a[0] * x[2] + a[1] * x[1] + a[2] * x[0]);
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x[1] = LOW(p[1] + r[0]);
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x[0] = LOW(p[0]);
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}
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