* Copyright (c) 2025 Huawei Technologies Co., Ltd.
* This program is free software, you can redistribute it and/or modify it under the terms and conditions of
* CANN Open Software License Agreement Version 2.0 (the "License").
* Please refer to the License for details. You may not use this file except in compliance with the License.
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
* See LICENSE in the root of the software repository for the full text of the License.
*/
* \file kernel_hif8.h
* \brief
*/
#ifndef ASCENDC_HIF8_H
#define ASCENDC_HIF8_H
#include <cstdint>
namespace hifloat8 {
* @ingroup Hif8T
Type Algo Coding Value
S D E M Sv Ev Mv
subnormal Sv * 2^(Mv - 23) 0 ~ 1 0000 - 000 ~ 111 ±1 - [0,7]
----------------------------------------------------------------------------------------
normal 0 ~ 1 0001 - 000 ~ 111 ±1 0 [0/8,7/8]
-------------------------------------------------------
Sv * 2^Ev*(1 + Mv) 0 ~ 1 001 0 ~ 1 000 ~ 111 ±1 ±1 [0/8,7/8]
-------------------------------------------------------
0 ~ 1 01 00 ~ 11 000 ~ 111 ±1 ±[2,3] [0/8,7/8]
-------------------------------------------------------
0 ~ 1 10 000 ~ 111 00 ~ 11 ±1 ±[4,7] [0/4,3/4]
--------------------------------------------------------
0 ~ 1 11 0000 ~ 1111 0 ~ 1 ±1 ±[8,15] [0/2,1/2]
-----------------------------------------------------------------------------------------
*/
struct Hif8T {
int8_t val;
public:
Hif8T() = default;
Hif8T(const Hif8T& fp8) : val(fp8.val) {}
Hif8T(const float src) : val(FloatToHif8(src)) {}
Hif8T& operator=(const Hif8T& fp8)
{
if (this != &fp8) {
this->val = fp8.val;
}
return *this;
}
int8_t FloatToHif8(const float src) const;
operator float() const;
float ToFloat() const;
};
}
using hifloat8_t = hifloat8::Hif8T;
#endif
