Imported Genode release 11.11

base/include/util/misc_math.h

@@ -0,0 +1,72 @@
+/*
+ * \brief  Commonly used math functions
+ * \author Norman Feske
+ * \date   2006-04-12
+ */
+
+/*
+ * Copyright (C) 2006-2011 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__UTIL__MISC_MATH_H_
+#define _INCLUDE__UTIL__MISC_MATH_H_
+
+namespace Genode {
+
+	template <typename T>
+	T max(T v1, T v2) { return v1 > v2 ? v1 : v2; }
+
+	template <typename T>
+	T min(T v1, T v2) { return v1 < v2 ? v1 : v2; }
+
+	template <typename T>
+	T abs(T value) { return value >= 0 ? value : -value; }
+
+
+	/**
+	 * Alignment to the power of two
+	 */
+	template <typename T>
+	static inline T _align_mask(T align) {
+		return ~((1 << align) - 1); }
+
+	template <typename T>
+	static inline T _align_offset(T align) {
+		return   (1 << align) - 1;  }
+
+	template <typename T>
+	static inline T align_addr(T addr, int align) {
+		return (addr + _align_offset(align)) & _align_mask(align); }
+
+
+	/**
+	 * LOG2
+	 *
+	 * Scan for most-significant set bit.
+	 */
+	template <typename T>
+	static inline T log2(T value)
+	{
+		if (!value) return -1;
+		for (int i = 8 * sizeof(value) - 1; i >= 0; --i)
+			if ((1 << i) & value) return i;
+
+		return -1;
+	}
+
+
+	/**
+	 * Align value to next machine-word boundary
+	 */
+	template <typename T>
+	inline T align_natural(T value)
+	{
+		T mask = sizeof(long) - 1;
+		return (value + mask) & ~mask;
+	}
+}
+
+#endif /* _INCLUDE__UTIL__MISC_MATH_H_ */