| /* |
| * 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 */ |
