Jordan Delong
363d1bb20f
This change is mostly for FB internal organizational reasons. Building is not effected beyond the fact that the target now lands in hphp/hhvm/hhvm rather than src/hhvm/hhvm.
67 linhas
2.2 KiB
C++
67 linhas
2.2 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010- Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#ifndef __BITS_H__
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#define __BITS_H__
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namespace HPHP {
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct BitInfo {
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static const T NumBits = sizeof(T) * 8;
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static const T HighMask = 0x1 << (NumBits - 1);
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};
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template <unsigned int i, unsigned int m>
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struct BitCountImpl {
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enum { value = ((i & m) ? 1 : 0) + BitCountImpl< i, (m >> 1) >::value };
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};
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template <unsigned int i>
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struct BitCountImpl<i, 0> {
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enum { value = 0 };
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};
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template <unsigned int i>
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struct BitCount: public BitCountImpl<i,
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BitInfo<unsigned int>::HighMask>
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{};
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template <unsigned int i, bool p, unsigned int m>
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struct BitPhaseImpl {
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enum {
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value = ((i & m) ? (p ? 0 : 1) : (p ? 1 : 0)) +
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BitPhaseImpl<i, i & m, (m >> 1)>::value
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};
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};
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template <unsigned int i, bool p>
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struct BitPhaseImpl<i, p, 0> {
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enum { value = 0 };
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};
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template <unsigned int i>
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struct BitPhase : public BitPhaseImpl<i,
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i & BitInfo<unsigned int>::HighMask,
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BitInfo<unsigned int>::HighMask>
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{};
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///////////////////////////////////////////////////////////////////////////////
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}
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#endif // __BITS_H__
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