Line data    Source code

       1              : /**
       2              :  * Copyright (c) 2025 Huawei Technologies Co., Ltd.
       3              :  * This program is free software, you can redistribute it and/or modify it under the terms and conditions of
       4              :  * CANN Open Software License Agreement Version 2.0 (the "License").
       5              :  * Please refer to the License for details. You may not use this file except in compliance with the License.
       6              :  * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
       7              :  * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
       8              :  * See LICENSE in the root of the software repository for the full text of the License.
       9              :  */
      10              : #ifndef BFLOAT16_H
      11              : #define BFLOAT16_H
      12              : 
      13              : #include "hifloat.h"
      14              : 
      15              : namespace Adx {
      16              : constexpr int32_t BF16_EXPONENT_BIAS = 127U;
      17              : 
      18              : class BFloat16 {
      19              : public:
      20              :     explicit BFloat16(uint16_t v = 0) : val(v) {}
      21              : 
      22            8 :     float GetValue() const {
      23            8 :         if (val == 0xFF80) {
      24            1 :             return -std::numeric_limits<float>::infinity();
      25            7 :         } else if (val == 0x7F80) {
      26            1 :             return std::numeric_limits<float>::infinity();
      27              :         } else {
      28            6 :             int32_t symbol = val >= 0x8000 ? -1 : 1;
      29            6 :             int32_t exponentVal = (val % 0x8000 / 0x0080);
      30            6 :             float mantissaVal = (val % 0x8000 % 0x0080) / static_cast<float>(0x0080);
      31            6 :             if ((exponentVal == 0xFF) && (mantissaVal > 0)) {
      32            1 :                 return std::numeric_limits<float>::quiet_NaN();
      33              :             }
      34            5 :             float value = 0.0;
      35            5 :             if (exponentVal == 0) {
      36            1 :                 value = static_cast<float>(symbol * pow(BASE_NUM, 1 - BF16_EXPONENT_BIAS) * mantissaVal);
      37              :             } else {
      38            4 :                 value = static_cast<float>(symbol * pow(BASE_NUM, exponentVal - BF16_EXPONENT_BIAS) * (mantissaVal + 1));
      39              :             }
      40            5 :             return value;
      41              :         }
      42              :     }
      43              : 
      44              : private:
      45              :     uint16_t val;
      46              : };
      47              : } // namespace Adx
      48              : 
      49              : #endif // BFLOAT16_H