Georgios Pinitas | 303f0db | 2018-11-19 11:56:51 +0000 | [diff] [blame] | 1 | /* |
Sang-Hoon Park | 68dd25f | 2020-10-19 16:00:11 +0100 | [diff] [blame] | 2 | * Copyright (c) 2018-2020 Arm Limited. |
Georgios Pinitas | 303f0db | 2018-11-19 11:56:51 +0000 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to |
| 8 | * deal in the Software without restriction, including without limitation the |
| 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 10 | * sell copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all |
| 14 | * copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
Michalis Spyrou | f464337 | 2019-11-29 16:17:13 +0000 | [diff] [blame] | 24 | #ifndef ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H |
| 25 | #define ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H |
Georgios Pinitas | 303f0db | 2018-11-19 11:56:51 +0000 | [diff] [blame] | 26 | |
Georgios Pinitas | 303f0db | 2018-11-19 11:56:51 +0000 | [diff] [blame] | 27 | #include "arm_compute/core/utils/misc/Traits.h" |
| 28 | #include "arm_compute/core/utils/misc/Utility.h" |
Sang-Hoon Park | 68dd25f | 2020-10-19 16:00:11 +0100 | [diff] [blame] | 29 | #include "support/Rounding.h" |
Georgios Pinitas | 303f0db | 2018-11-19 11:56:51 +0000 | [diff] [blame] | 30 | |
| 31 | namespace arm_compute |
| 32 | { |
| 33 | namespace utils |
| 34 | { |
| 35 | namespace cast |
| 36 | { |
| 37 | // *INDENT-OFF* |
| 38 | // clang-format off |
| 39 | // same type |
| 40 | template<typename T, |
| 41 | typename U, |
| 42 | typename std::enable_if<std::is_same<T, U>::value, int >::type = 0 > |
| 43 | T saturate_cast(U v) |
| 44 | { |
| 45 | return v; |
| 46 | } |
| 47 | |
| 48 | // signed -> signed widening/same_width |
| 49 | template<typename T, |
| 50 | typename U, |
| 51 | typename std::enable_if<std::is_integral<T>::value && |
| 52 | std::is_integral<U>::value && |
| 53 | std::is_signed<U>() && |
| 54 | std::is_signed<T>() && |
| 55 | !std::is_same<T, U>::value && |
| 56 | sizeof(T) >= sizeof(U), |
| 57 | int >::type = 0 > |
| 58 | inline T saturate_cast(U v) |
| 59 | { |
| 60 | return static_cast<T>(v); |
| 61 | } |
| 62 | // signed -> signed narrowing |
| 63 | template<typename T, |
| 64 | typename U, |
| 65 | typename std::enable_if<std::is_integral<T>::value && |
| 66 | std::is_integral<U>::value && |
| 67 | std::is_signed<U>() && |
| 68 | std::is_signed<T>() && |
| 69 | !std::is_same<T, U>::value && |
| 70 | sizeof(T) < sizeof(U), |
| 71 | int >::type = 0 > |
| 72 | inline T saturate_cast(U v) |
| 73 | { |
| 74 | return static_cast<T>(utility::clamp<U>(v, std::numeric_limits<T>::lowest(), std::numeric_limits<T>::max())); |
| 75 | } |
| 76 | |
| 77 | // unsigned -> signed widening |
| 78 | template<typename T, |
| 79 | typename U, |
| 80 | typename std::enable_if<std::is_integral<T>::value && |
| 81 | std::is_integral<U>::value && |
| 82 | std::is_unsigned<U>() && |
| 83 | std::is_signed<T>() && |
| 84 | !std::is_same<T, U>::value && |
| 85 | (sizeof(T) > sizeof(U)), |
| 86 | int >::type = 0 > |
| 87 | inline T saturate_cast(U v) |
| 88 | { |
| 89 | return static_cast<T>(v); |
| 90 | } |
| 91 | // unsigned -> signed narrowing |
| 92 | template<typename T, |
| 93 | typename U, |
| 94 | typename std::enable_if<std::is_integral<T>::value && |
| 95 | std::is_integral<U>::value && |
| 96 | std::is_unsigned<U>() && |
| 97 | std::is_signed<T>() && |
| 98 | !std::is_same<T, U>::value && |
| 99 | sizeof(T) < sizeof(U), |
| 100 | int >::type = 0 > |
| 101 | inline T saturate_cast(U v) |
| 102 | { |
| 103 | return static_cast<T>(std::min<U>(v, std::numeric_limits<T>::max())); |
| 104 | } |
| 105 | // unsigned -> signed same_width |
| 106 | template<typename T, |
| 107 | typename U, |
| 108 | typename std::enable_if<std::is_integral<T>::value && |
| 109 | std::is_integral<U>::value && |
| 110 | std::is_unsigned<U>() && |
| 111 | std::is_signed<T>() && |
| 112 | !std::is_same<T, U>::value && |
| 113 | sizeof(T) == sizeof(U), |
| 114 | int >::type = 0 > |
| 115 | inline T saturate_cast(U v) |
| 116 | { |
| 117 | return static_cast<T>(std::min<U>(v, std::numeric_limits<T>::max())); |
| 118 | } |
| 119 | |
| 120 | // signed -> unsigned widening/same width |
| 121 | template<typename T, |
| 122 | typename U, |
| 123 | typename std::enable_if<std::is_integral<T>::value && |
| 124 | std::is_integral<U>::value && |
| 125 | std::is_signed<U>() && |
| 126 | std::is_unsigned<T>() && |
| 127 | !std::is_same<T, U>::value && |
| 128 | sizeof(T) >= sizeof(U), |
| 129 | int >::type = 0 > |
| 130 | inline T saturate_cast(U v) |
| 131 | { |
| 132 | return static_cast<T>(std::max<U>(0, v)); |
| 133 | } |
| 134 | |
| 135 | // signed -> unsigned narrowing |
| 136 | template<typename T, |
| 137 | typename U, |
| 138 | typename std::enable_if<std::is_integral<T>::value && |
| 139 | std::is_integral<U>::value && |
| 140 | std::is_signed<U>() && |
| 141 | std::is_unsigned<T>() && |
| 142 | !std::is_same<T, U>::value && |
| 143 | sizeof(T) < sizeof(U), |
| 144 | int >::type = 0 > |
| 145 | inline T saturate_cast(U v) |
| 146 | { |
| 147 | return static_cast<T>(utility::clamp<U>(v, 0, std::numeric_limits<T>::max())); |
| 148 | } |
| 149 | |
| 150 | // unsigned -> unsigned widening/same width |
| 151 | template<typename T, |
| 152 | typename U, |
| 153 | typename std::enable_if<std::is_integral<T>::value && |
| 154 | std::is_integral<U>::value && |
| 155 | std::is_unsigned<T>() && |
| 156 | std::is_unsigned<U>() && |
| 157 | !std::is_same<T, U>::value && |
| 158 | sizeof(T) >= sizeof(U), |
| 159 | int >::type = 0 > |
| 160 | inline T saturate_cast(U v) |
| 161 | { |
| 162 | return static_cast<T>(v); |
| 163 | } |
| 164 | |
| 165 | // unsigned -> unsigned narrowing |
| 166 | template<typename T, |
| 167 | typename U, |
| 168 | typename std::enable_if<std::is_integral<T>::value && |
| 169 | std::is_integral<U>::value && |
| 170 | std::is_unsigned<T>() && |
| 171 | std::is_unsigned<U>() && |
| 172 | !std::is_same<T, U>::value && |
| 173 | sizeof(T) < sizeof(U), |
| 174 | int >::type = 0 > |
| 175 | inline T saturate_cast(U v) |
| 176 | { |
| 177 | return static_cast<T>(utility::clamp<U>(v, std::numeric_limits<T>::lowest(), std::numeric_limits<T>::max())); |
| 178 | } |
| 179 | |
| 180 | // float -> int |
| 181 | template<typename T, |
| 182 | typename U, |
| 183 | typename std::enable_if<std::is_integral<T>::value && |
| 184 | traits::is_floating_point<U>::value, |
| 185 | int >::type = 0 > |
| 186 | inline T saturate_cast(U v) |
| 187 | { |
| 188 | int32_t vi = utils::rounding::round_half_away_from_zero(v); |
| 189 | return saturate_cast<T>(vi); |
| 190 | } |
| 191 | |
| 192 | // int -> float |
| 193 | template<typename T, |
| 194 | typename U, |
| 195 | typename std::enable_if<traits::is_floating_point<T>::value && |
| 196 | std::is_integral<U>::value, |
| 197 | int >::type = 0 > |
| 198 | inline T saturate_cast(U v) |
| 199 | { |
| 200 | return static_cast<T>(v); |
| 201 | } |
| 202 | |
| 203 | // float -> float |
| 204 | template<typename T, |
| 205 | typename U, |
| 206 | typename std::enable_if<traits::is_floating_point<T>::value && |
| 207 | traits::is_floating_point<U>::value, |
| 208 | int >::type = 0 > |
| 209 | inline T saturate_cast(U v) |
| 210 | { |
| 211 | return static_cast<T>(v); |
| 212 | } |
| 213 | // clang-format on |
| 214 | // *INDENT-ON* |
| 215 | } // namespace cast |
| 216 | } // namespace utils |
| 217 | } // namespace arm_compute |
Michalis Spyrou | f464337 | 2019-11-29 16:17:13 +0000 | [diff] [blame] | 218 | #endif /* ARM_COMPUTE_UTILS_CAST_SATURATE_CAST_H */ |