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

zano/libethash/builtins.h

@@ -0,0 +1,43 @@
+/* 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.
+ */
+
+/**
+ * @file
+ * Implementation of GCC/clang builtins for MSVC compiler.
+ */
+
+#pragma once
+
+#ifdef _MSC_VER
+#include <intrin.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Returns the number of leading 0-bits in `x`, starting at the most significant bit position.
+ * If `x` is 0, the result is undefined.
+ */
+static inline int __builtin_clz(unsigned int x)
+{
+    unsigned long most_significant_bit;
+    _BitScanReverse(&most_significant_bit, x);
+    return 31 - (int)most_significant_bit;
+}
+
+/**
+ * Returns the number of 1-bits in `x`.
+ */
+static inline int __builtin_popcount(unsigned int x)
+{
+    return (int)__popcnt(x);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif