Coverage for /opt/cloud/slavespace/usr1/096471637100f3de0fcfc01072822a80/ut/utils/show_kernel_debug_data/show_kernel_debug_data/data_converter.py: 100%

1#!/usr/bin/python 

2# -*- coding: utf-8 -*- 

3# ---------------------------------------------------------------------------------------------------------- 

4# Copyright (c) 2025 Huawei Technologies Co., Ltd. 

5# This program is free software, you can redistribute it and/or modify it under the terms and conditions of 

6# CANN Open Software License Agreement Version 2.0 (the "License"). 

7# Please refer to the License for details. You may not use this file except in compliance with the License. 

8# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, 

9# INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. 

10# See LICENSE in the root of the software repository for the full text of the License. 

11# ---------------------------------------------------------------------------------------------------------- 

12 

13EXPONENT_BIAS_BF16 = 127 

14 

15 

16def decode_bfloat16(num : int) -> float: 

17 if num == 0: 

18 return 0 

19 elif num == 0xFF80: 

20 return float("-inf") 

21 elif num == 0x7F80: 

22 return float("inf") 

23 if num >= 0x8000: 

24 signal_val = -1 

25 else: 

26 signal_val = 1 

27 exponent_val = (num % 0x8000 // 0x0080) 

28 mantissa_val = (num % 0x8000 % 0x0080) / 0x0080 

29 if exponent_val == 0xFF and mantissa_val > 0: 

30 return float("nan") 

31 if exponent_val == 0: 

32 return signal_val * 2 ** (-EXPONENT_BIAS_BF16 + 1) * mantissa_val 

33 else: 

34 return signal_val * 2 ** (exponent_val - EXPONENT_BIAS_BF16) * (1 + mantissa_val)