提交 291318e5 编写于 作者: L liaogang 提交者: Yu Yang

delete Bits.h and move its func into utils/Util.h

Change-Id: Ib7f7d3c65c9850b8420f9a4799835a7ea03572bd
上级 4866c995
Utils Utils
======= =======
Bits
-------
.. doxygenfile:: paddle/math/Bits.h
Memory Handle Memory Handle
-------------- --------------
.. doxygenfile:: paddle/math/MemoryHandle.h .. doxygenfile:: paddle/math/MemoryHandle.h
......
...@@ -14,8 +14,7 @@ limitations under the License. */ ...@@ -14,8 +14,7 @@ limitations under the License. */
#include "HierarchicalSigmoidLayer.h" #include "HierarchicalSigmoidLayer.h"
#include "paddle/utils/Util.h"
#include "paddle/math/Bits.h"
namespace paddle { namespace paddle {
......
/* Copyright (c) 2016 Baidu, Inc. All Rights Reserve.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. */
#pragma once
#include <type_traits>
namespace paddle {
/**
* From Facebook folly:
* https://github.com/facebook/folly/blob/master/folly/Bits.h
*
* findLastSet: return the 1-based index of the highest bit set
*
* for x > 0:
* \f[
* findLastSet(x) = 1 + \floor*{\log_{2}x}
* \f]
*/
template <class T>
inline constexpr typename std::enable_if<(std::is_integral<T>::value &&
std::is_unsigned<T>::value &&
sizeof(T) <= sizeof(unsigned int)),
unsigned int>::type
findLastSet(T x) {
return x ? 8 * sizeof(unsigned int) - __builtin_clz(x) : 0;
}
template <class T>
inline constexpr
typename std::enable_if<(std::is_integral<T>::value &&
std::is_unsigned<T>::value &&
sizeof(T) > sizeof(unsigned int) &&
sizeof(T) <= sizeof(unsigned long)), // NOLINT
unsigned int>::type
findLastSet(T x) {
return x ? 8 * sizeof(unsigned long) - __builtin_clzl(x) : 0; // NOLINT
}
} // namespace paddle
...@@ -14,7 +14,7 @@ limitations under the License. */ ...@@ -14,7 +14,7 @@ limitations under the License. */
#include "paddle/utils/Logging.h" #include "paddle/utils/Logging.h"
#include "Bits.h" #include "paddle/utils/Util.h"
#include "Matrix.h" #include "Matrix.h"
#include "hl_gpu.h" #include "hl_gpu.h"
......
...@@ -63,6 +63,18 @@ limitations under the License. */ ...@@ -63,6 +63,18 @@ limitations under the License. */
namespace paddle { namespace paddle {
/**
* return the 1-based index of the highest bit set
*
* for x > 0:
* \f[
* findLastSet(x) = 1 + \floor*{\log_{2}x}
* \f]
*/
inline constexpr size_t findLastSet(size_t x) {
return x ? 8 * sizeof(unsigned long) - __builtin_clzl(x) : 0; // NOLINT
}
/** /**
* calculate the non-negative remainder of a/b * calculate the non-negative remainder of a/b
* @param[in] a * @param[in] a
......
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