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