progminer zano miner fork https://github.com/hyle-team/progminer

zano/libethash/kiss99.hpp

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+/* ethash: C/C++ implementation of Ethash, the Ethereum Proof of Work algorithm.
+ * Copyright 2018 Pawel Bylica.
+ * Licensed under the Apache License, Version 2.0. See the LICENSE file.
+ */
+
+#pragma once
+
+#include "support/attributes.h"
+#include <stdint.h>
+
+/**
+ * KISS PRNG by the spec from 1999.
+ *
+ * The implementation of KISS pseudo-random number generator
+ * by the specification published on 21 Jan 1999 in
+ * http://www.cse.yorku.ca/~oz/marsaglia-rng.html.
+ * The KISS is not versioned so here we are using `kiss99` prefix to indicate
+ * the version from 1999.
+ *
+ * The specification uses `unsigned long` type with the intention for 32-bit
+ * values. Because in GCC/clang for 64-bit architectures `unsigned long` is
+ * 64-bit size type, here the explicit `uint32_t` type is used.
+ *
+ * @defgroup kiss99 KISS99
+ * @{
+ */
+
+/**
+ * The KISS generator.
+ */
+class kiss99
+{
+    uint32_t z = 362436069;
+    uint32_t w = 521288629;
+    uint32_t jsr = 123456789;
+    uint32_t jcong = 380116160;
+
+public:
+    /** Creates KISS generator state with default values provided by the specification. */
+    kiss99() noexcept = default;
+
+    /** Creates KISS generator state with provided init values.*/
+    kiss99(uint32_t z, uint32_t w, uint32_t jsr, uint32_t jcong) noexcept
+      : z{z}, w{w}, jsr{jsr}, jcong{jcong}
+    {}
+
+    /** Generates next number from the KISS generator. */
+    NO_SANITIZE("unsigned-integer-overflow")
+    uint32_t operator()() noexcept
+    {
+        z = 36969 * (z & 0xffff) + (z >> 16);
+        w = 18000 * (w & 0xffff) + (w >> 16);
+
+        jcong = 69069 * jcong + 1234567;
+
+        jsr ^= (jsr << 17);
+        jsr ^= (jsr >> 13);
+        jsr ^= (jsr << 5);
+
+        return (((z << 16) + w) ^ jcong) + jsr;
+    }
+};
+
+/** @} */