149 lines
3.9 KiB
C++
149 lines
3.9 KiB
C++
/* Copyright 2019-2020 Canaan Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "../datatypes.h"
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namespace nncase
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{
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namespace runtime
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{
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inline size_t get_bytes(datatype_t type)
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{
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size_t element_size;
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switch (type)
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{
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case dt_float32:
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element_size = 4;
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break;
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case dt_uint8:
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element_size = 1;
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break;
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default:
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NNCASE_THROW(std::runtime_error, "Not supported data type");
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}
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return element_size;
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}
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template <int32_t Bits, class T>
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uint8_t count_leading_zeros(T value)
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{
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uint8_t num_zeroes = 0;
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for (int32_t i = Bits - 1; i >= 0; i--)
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{
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if ((value & (1ULL << i)) == 0)
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++num_zeroes;
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else
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break;
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}
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return num_zeroes;
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}
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template <class T = uint64_t>
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inline T bit_mask(uint8_t shift)
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{
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return (T(1) << shift) - 1;
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}
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template <class T, bool Banker = false>
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T carry_shift(T value, uint8_t shift)
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{
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if (shift > 0)
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{
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if constexpr (Banker)
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{
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T result;
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// Sign | Int (T - shift - 1 bits) | Frac (shift bits)
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// S IIII FFF
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auto integral = value >> shift;
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auto fractional = value & bit_mask(shift);
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auto sign = value < 0 ? -1 : 1;
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auto half = 1 << (shift - 1);
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// frac < 0.5
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if (fractional < half)
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{
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return integral;
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}
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// frac > 0.5
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else if (fractional > half)
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{
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return integral + sign;
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}
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// frac == 0.5
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else
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{
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// odd
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if (integral & 1)
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return integral + sign;
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// even
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else
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return integral;
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}
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return result;
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}
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else
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{
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value += T(1) << (shift - 1);
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value >>= shift;
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}
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}
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else if (shift < 0)
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{
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value = value << (-shift);
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}
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return value;
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}
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template <bool Banker = false>
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inline int32_t mul_and_carry_shift(int32_t value, int32_t mul, uint8_t shift)
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{
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return (int32_t)carry_shift<int64_t, Banker>((int64_t)value * mul, shift);
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}
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template <uint8_t Bits>
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inline int32_t clamp(int32_t value)
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{
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auto min = std::numeric_limits<int32_t>::lowest() >> (32 - Bits);
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auto max = std::numeric_limits<int32_t>::max() >> (32 - Bits);
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return std::clamp(value, min, max);
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}
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template <class T>
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struct to_datatype
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{
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};
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template <>
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struct to_datatype<float>
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{
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static constexpr datatype_t type = dt_float32;
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};
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template <>
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struct to_datatype<uint8_t>
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{
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static constexpr datatype_t type = dt_uint8;
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};
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template <class T>
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inline constexpr datatype_t to_datatype_v = to_datatype<T>::type;
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}
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}
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