219 lines
7.7 KiB
C++
219 lines
7.7 KiB
C++
/*
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* Copyright (c) 2018-2020 Arm Limited.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H
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#define ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H
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#include "arm_compute/core/utils/misc/Traits.h"
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#include "arm_compute/core/utils/misc/Utility.h"
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#include "support/Rounding.h"
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namespace arm_compute
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{
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namespace utils
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{
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namespace cast
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{
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// *INDENT-OFF*
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// clang-format off
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// same type
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template<typename T,
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typename U,
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typename std::enable_if<std::is_same<T, U>::value, int >::type = 0 >
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T saturate_cast(U v)
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{
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return v;
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}
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// signed -> signed widening/same_width
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_signed<U>() &&
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std::is_signed<T>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) >= sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(v);
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}
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// signed -> signed narrowing
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_signed<U>() &&
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std::is_signed<T>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) < sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(utility::clamp<U>(v, std::numeric_limits<T>::lowest(), std::numeric_limits<T>::max()));
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}
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// unsigned -> signed widening
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_unsigned<U>() &&
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std::is_signed<T>() &&
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!std::is_same<T, U>::value &&
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(sizeof(T) > sizeof(U)),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(v);
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}
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// unsigned -> signed narrowing
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_unsigned<U>() &&
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std::is_signed<T>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) < sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(std::min<U>(v, std::numeric_limits<T>::max()));
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}
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// unsigned -> signed same_width
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_unsigned<U>() &&
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std::is_signed<T>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) == sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(std::min<U>(v, std::numeric_limits<T>::max()));
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}
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// signed -> unsigned widening/same width
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_signed<U>() &&
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std::is_unsigned<T>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) >= sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(std::max<U>(0, v));
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}
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// signed -> unsigned narrowing
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_signed<U>() &&
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std::is_unsigned<T>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) < sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(utility::clamp<U>(v, 0, std::numeric_limits<T>::max()));
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}
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// unsigned -> unsigned widening/same width
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_unsigned<T>() &&
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std::is_unsigned<U>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) >= sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(v);
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}
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// unsigned -> unsigned narrowing
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_integral<U>::value &&
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std::is_unsigned<T>() &&
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std::is_unsigned<U>() &&
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!std::is_same<T, U>::value &&
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sizeof(T) < sizeof(U),
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(utility::clamp<U>(v, std::numeric_limits<T>::lowest(), std::numeric_limits<T>::max()));
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}
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// float -> int
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template<typename T,
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typename U,
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typename std::enable_if<std::is_integral<T>::value &&
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traits::is_floating_point<U>::value,
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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int32_t vi = utils::rounding::round_half_away_from_zero(v);
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return saturate_cast<T>(vi);
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}
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// int -> float
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template<typename T,
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typename U,
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typename std::enable_if<traits::is_floating_point<T>::value &&
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std::is_integral<U>::value,
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(v);
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}
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// float -> float
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template<typename T,
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typename U,
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typename std::enable_if<traits::is_floating_point<T>::value &&
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traits::is_floating_point<U>::value,
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int >::type = 0 >
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inline T saturate_cast(U v)
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{
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return static_cast<T>(v);
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}
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// clang-format on
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// *INDENT-ON*
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} // namespace cast
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} // namespace utils
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} // namespace arm_compute
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#endif /* ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H */
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