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//
// Copyright © 2024 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include <armnn/Exceptions.hpp>
#pragma once
inline void CreateRescaleTosaOperator(const std::string& inputName,
const std::string& outputName,
const std::vector<int32_t>& multipliers,
const std::vector<int32_t>& shifts,
int32_t input_zp,
int32_t output_zp,
bool double_round,
bool scale32,
bool per_channel,
TosaSerializationOperator** op)
{
if (!op)
{
throw armnn::Exception("CreateRescaleTosaOperator: nullptr op");
}
TosaRescaleAttribute attribute(input_zp,
output_zp,
multipliers,
shifts,
scale32,
double_round,
per_channel,
false, // input_unsigned
false); // output_unsigned
// op
*op = new TosaSerializationOperator(Op_RESCALE, Attribute_RescaleAttribute, &attribute, {inputName}, {outputName});
if (!(*op))
{
throw armnn::Exception("CreateRescaleTosaOperator: failed to created operator");
}
}
inline void CreateRescaleTosaOperator(const std::string& inputName,
const std::string& outputName,
int32_t scale_multiplier,
int32_t scale_shift,
int32_t input_zp,
int32_t output_zp,
bool double_round,
bool scale32,
bool per_channel,
TosaSerializationOperator** op)
{
const std::vector<int32_t> multipliers{scale_multiplier};
const std::vector<int32_t> shifts{scale_shift};
CreateRescaleTosaOperator(inputName, outputName, multipliers, shifts,
input_zp, output_zp, double_round, scale32, per_channel, op);
}
/// The following is taken from mlir/lib/Dialect/Tosa/Utils/QuantUtils.cpp in the LLVM project
/// From a scale value, generates multiplier and shift values where
/// mantissa is in [-1.0,-0.5] or [0.5, 1.0] such that
/// multiplier = mantissa*2^shift for 32-bit scaling.
static void ComputeMultiplierAndShiftTosaScale32(double scale,
int32_t &multiplier,
int32_t &shift)
{
const double mantissa = std::frexp(scale, &shift);
auto shiftedM = std::round(mantissa * (int64_t(1) << 31));
// Can't be greater than 1.0.
if (!(shiftedM <= (int64_t(1) << 31)))
{
throw armnn::Exception("Shifted mantissa exceeds 32 signed bits");
}
if (shiftedM == (int64_t(1) << 31))
{
shiftedM /= 2;
shift++;
}
// TOSA expects right shift to be positive, and embed (1 << 31) into right
// shift bits.
shift = (-shift) + 31;
if (!(shiftedM <= std::numeric_limits<int32_t>::max()))
{
throw armnn::Exception("Shifted mantissa exceeds 32-bit signed output type");
}
multiplier = static_cast<int32_t>(shiftedM);
// Shifting tops out at 62 bits. Right shift to make 62 bits the max.
// The limit of 62 on shift allows the shift to be decomposed as
// two right shifts of 31.
if (shift > 62)
{
// Shifting the multiplier by more than 32-bits is unnecessary.
multiplier = multiplier >> std::min<int32_t>(31, shift - 62);
shift = 62;
}
}
/// The following is taken from mlir/lib/Dialect/Tosa/Utils/QuantUtils.cpp in the LLVM project
/// From a scale value, generates multiplier and shift values where
/// mantissa is in [-1.0,-0.5] or [0.5, 1.0] such that
/// multiplier = mantissa*2^shift for 16-bit scaling.
static void ComputeMultiplierAndShiftTosaScale16(double scale,
int32_t &multiplier,
int32_t &shift)
{
const double mantissa = std::frexp(scale, &shift);
auto shiftedM = std::round(mantissa * (int64_t(1) << 15));
// Can't be greater than 1.0.
if (!(shiftedM <= (int64_t(1) << 15)))
{
throw armnn::Exception("Shifted mantissa exceeds 16 signed bits");
}
if (shiftedM == (int64_t(1) << 15))
{
shiftedM /= 2;
shift++;
}
// TOSA expects right shift to be positive and embed (1 << 15) into right
// shift bits.
shift = (-shift) + 15;
if (!(shiftedM <= std::numeric_limits<int32_t>::max()))
{
throw armnn::Exception("Shifted mantissa exceeds 32-bit signed output type");
}
multiplier = static_cast<int32_t>(shiftedM);
// Shifting tops out at 62 bits. Right shift to make 62 bits the max.
// The limit of 62 on shift allows the shift to be decomposed as
// two right shifts of 31.
if (shift > 62)
{
// Shifting the multiplier by more than 31-bits is unnecessary.
multiplier = multiplier >> std::min<int32_t>(31, shift - 62);
shift = 62;
}
}
inline void CreateRescaleTosaOperator(const std::string& inputName,
const std::string& outputName,
double scale,
int32_t input_zp,
int32_t output_zp,
bool double_round,
bool scale32,
TosaSerializationOperator** op)
{
int32_t multiplier;
int32_t shift;
if (scale32)
{
ComputeMultiplierAndShiftTosaScale32(scale, multiplier, shift);
}
else
{
ComputeMultiplierAndShiftTosaScale16(scale, multiplier, shift);
}
CreateRescaleTosaOperator(inputName, outputName, multiplier, shift,
input_zp, output_zp, double_round, scale32, false, op);
}
inline void CreateRescaleTosaOperatorPerChannel(const std::string& inputName,
const std::string& outputName,
int32_t input_zp,
int32_t output_zp,
bool double_round,
bool scale32,
double input_scale,
double output_scale,
const std::vector<float>& weight_scales,
TosaSerializationOperator** op)
{
std::vector<int32_t> op_tensor_multipliers;
std::vector<int32_t> op_tensor_shifts;
op_tensor_multipliers.reserve(weight_scales.size());
op_tensor_shifts.reserve(weight_scales.size());
for (const float& weight_scale : weight_scales)
{
double op_tensor_scale = (input_scale * weight_scale) / output_scale;
int32_t multiplier;
int32_t shift;
if (scale32)
{
ComputeMultiplierAndShiftTosaScale32(op_tensor_scale, multiplier, shift);
}
else
{
ComputeMultiplierAndShiftTosaScale16(op_tensor_scale, multiplier, shift);
}
op_tensor_multipliers.push_back(multiplier);
op_tensor_shifts.push_back(shift);
}
CreateRescaleTosaOperator(inputName, outputName, op_tensor_multipliers, op_tensor_shifts,
input_zp, output_zp, double_round, scale32, true, op);
}
inline void CreateFromInt32RescaleTosaOperator(const std::string& inputName,
const std::string& outputName,
double output_scale,
int32_t output_zp,
TosaSerializationOperator** op)
{
CreateRescaleTosaOperator(inputName, outputName, output_scale,
0, output_zp, true, true, op);
}
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