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Diffstat (limited to 'support/SaturateCast.h')
| -rw-r--r-- | support/SaturateCast.h | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/support/SaturateCast.h b/support/SaturateCast.h new file mode 100644 index 0000000000..7af9f983ed --- /dev/null +++ b/support/SaturateCast.h @@ -0,0 +1,219 @@ +/* + * Copyright (c) 2018-2020 Arm Limited. + * + * SPDX-License-Identifier: MIT + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#ifndef ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H +#define ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H + +#include "arm_compute/core/utils/misc/Traits.h" +#include "arm_compute/core/utils/misc/Utility.h" + +#include "support/Rounding.h" + +namespace arm_compute +{ +namespace utils +{ +namespace cast +{ +// *INDENT-OFF* +// clang-format off +// same type +template<typename T, + typename U, + typename std::enable_if<std::is_same<T, U>::value, int >::type = 0 > +T saturate_cast(U v) +{ + return v; +} + +// signed -> signed widening/same_width +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_signed<U>() && + std::is_signed<T>() && + !std::is_same<T, U>::value && + sizeof(T) >= sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(v); +} +// signed -> signed narrowing +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_signed<U>() && + std::is_signed<T>() && + !std::is_same<T, U>::value && + sizeof(T) < sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(utility::clamp<U>(v, std::numeric_limits<T>::lowest(), std::numeric_limits<T>::max())); +} + +// unsigned -> signed widening +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_unsigned<U>() && + std::is_signed<T>() && + !std::is_same<T, U>::value && + (sizeof(T) > sizeof(U)), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(v); +} +// unsigned -> signed narrowing +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_unsigned<U>() && + std::is_signed<T>() && + !std::is_same<T, U>::value && + sizeof(T) < sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(std::min<U>(v, std::numeric_limits<T>::max())); +} +// unsigned -> signed same_width +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_unsigned<U>() && + std::is_signed<T>() && + !std::is_same<T, U>::value && + sizeof(T) == sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(std::min<U>(v, std::numeric_limits<T>::max())); +} + +// signed -> unsigned widening/same width +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_signed<U>() && + std::is_unsigned<T>() && + !std::is_same<T, U>::value && + sizeof(T) >= sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(std::max<U>(0, v)); +} + +// signed -> unsigned narrowing +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_signed<U>() && + std::is_unsigned<T>() && + !std::is_same<T, U>::value && + sizeof(T) < sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(utility::clamp<U>(v, 0, std::numeric_limits<T>::max())); +} + +// unsigned -> unsigned widening/same width +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_unsigned<T>() && + std::is_unsigned<U>() && + !std::is_same<T, U>::value && + sizeof(T) >= sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(v); +} + +// unsigned -> unsigned narrowing +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + std::is_integral<U>::value && + std::is_unsigned<T>() && + std::is_unsigned<U>() && + !std::is_same<T, U>::value && + sizeof(T) < sizeof(U), + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(utility::clamp<U>(v, std::numeric_limits<T>::lowest(), std::numeric_limits<T>::max())); +} + +// float -> int +template<typename T, + typename U, + typename std::enable_if<std::is_integral<T>::value && + traits::is_floating_point<U>::value, + int >::type = 0 > +inline T saturate_cast(U v) +{ + int32_t vi = utils::rounding::round_half_away_from_zero(v); + return saturate_cast<T>(vi); +} + +// int -> float +template<typename T, + typename U, + typename std::enable_if<traits::is_floating_point<T>::value && + std::is_integral<U>::value, + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(v); +} + +// float -> float +template<typename T, + typename U, + typename std::enable_if<traits::is_floating_point<T>::value && + traits::is_floating_point<U>::value, + int >::type = 0 > +inline T saturate_cast(U v) +{ + return static_cast<T>(v); +} +// clang-format on +// *INDENT-ON* +} // namespace cast +} // namespace utils +} // namespace arm_compute +#endif /* ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H */ |