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

zano/libethash/bit_manipulation.h

@@ -0,0 +1,81 @@
+/* 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 "builtins.h"
+#include "support/attributes.h"
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline uint32_t rotl32(uint32_t n, unsigned int c)
+{
+    const unsigned int mask = 31;
+
+    c &= mask;
+    unsigned int neg_c = (unsigned int)(-(int)c);
+    return (n << c) | (n >> (neg_c & mask));
+}
+
+static inline uint32_t rotr32(uint32_t n, unsigned int c)
+{
+    const unsigned int mask = 31;
+
+    c &= mask;
+    unsigned int neg_c = (unsigned int)(-(int)c);
+    return (n >> c) | (n << (neg_c & mask));
+}
+
+static inline uint32_t clz32(uint32_t x)
+{
+    return x ? (uint32_t)__builtin_clz(x) : 32;
+}
+
+static inline uint32_t popcount32(uint32_t x)
+{
+    return (uint32_t)__builtin_popcount(x);
+}
+
+static inline uint32_t mul_hi32(uint32_t x, uint32_t y)
+{
+    return (uint32_t)(((uint64_t)x * (uint64_t)y) >> 32);
+}
+
+
+/** FNV 32-bit prime. */
+static const uint32_t fnv_prime = 0x01000193;
+
+/** FNV 32-bit offset basis. */
+static const uint32_t fnv_offset_basis = 0x811c9dc5;
+
+/**
+ * The implementation of FNV-1 hash.
+ *
+ * See https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function#FNV-1_hash.
+ */
+NO_SANITIZE("unsigned-integer-overflow")
+static inline uint32_t fnv1(uint32_t u, uint32_t v) noexcept
+{
+    return (u * fnv_prime) ^ v;
+}
+
+/**
+ * The implementation of FNV-1a hash.
+ *
+ * See https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function#FNV-1a_hash.
+ */
+NO_SANITIZE("unsigned-integer-overflow")
+static inline uint32_t fnv1a(uint32_t u, uint32_t v) noexcept
+{
+    return (u ^ v) * fnv_prime;
+}
+
+#ifdef __cplusplus
+}
+#endif