megenginelite-sys 1.8.2

A safe megenginelite wrapper in Rust
Documentation 
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/**
 * \file dnn/src/arm_common/quantized_converter.h
 * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
 *
 * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.
 */
#pragma once

#include "megdnn/dtype.h"
#include "megdnn/oprs.h"
#include "src/common/utils.h"
#include "src/fallback/general_intrinsic/gi_float.h"
#include "src/fallback/general_intrinsic/gi_int.h"

namespace megdnn {
namespace fallback {

struct QConverterBase {
    inline static GI_INT32 vzero() { return GiBroadcastInt32(0); }

    inline static GI_FLOAT32 vfzero() { return GiBroadcastFloat32(0.f); }

    inline static GI_FLOAT32 vfhalf() { return GiBroadcastFloat32(0.5f); }

    inline static GI_FLOAT32 vfneg_half() { return GiBroadcastFloat32(-0.5f); }
};

struct QConverter {
    template <typename dst_type, typename... src_type>
    static inline dst_type convert(const src_type&... src);

    template <typename dst_type, typename... src_type>
    static inline dst_type round(const src_type&... src);
};

template <>
inline dt_qint8 QConverter::convert(const float& src) {
    return dt_qint8(saturate<int8_t, float>(std::round(src), -128, 127));
}

template <>
inline dt_quint8 QConverter::convert(const float& src, const uint8_t& zp) {
    return dt_quint8(saturate<uint8_t, float>(std::round(src) + zp, 0, 255));
}

template <>
inline dt_qint32 QConverter::convert(const float& src) {
    return dt_qint32(saturate<int32_t, float>(
            std::round(src), static_cast<float>(std::numeric_limits<int32_t>::min()),
            static_cast<float>(std::numeric_limits<int32_t>::max())));
}

template <>
inline GI_FLOAT32_V2 QConverter::convert(const GI_INT16& vsrc) {
    GI_INT32 vhi = GiMoveHighLongInt16(vsrc);
    GI_INT32 vlo = GiMoveLowLongInt16(vsrc);
    return {{GiCastToFloat32(vlo), GiCastToFloat32(vhi)}};
}

template <>
inline GI_INT8 QConverter::convert(const GI_FLOAT32_V2& vsrc) {
    return GiCvtFromFloat32V2ToInt8(vsrc);
}
template <>
inline GI_INT8 QConverter::convert(const GI_FLOAT32& src) {
    return GiCvtFromFloat32ToInt8(src);
}

template <>
inline GI_INT32 QConverter::round(const GI_FLOAT32& vsrc) {
    return GiRoundAsInt32(vsrc);
}
}  // namespace fallback
}  // namespace megdnn

// vim: syntax=cpp.doxygen