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// Copyright (c) 2020-2021, ARM Limited.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef TOSA_REFERENCE_QUANT_UTIL_H
#define TOSA_REFERENCE_QUANT_UTIL_H
#include "arith_util.h"
#include "func_debug.h"
#include "ops/template_types.h"
#include "tosa_generated.h"
using namespace tosa;
namespace TosaReference
{
class QuantUtil
{
public:
static void reciprocal_scale(int32_t value,
// Output
int32_t& multiplier,
int32_t& shift)
{
ASSERT_MSG(value > 0, "AvgPool2d reciprocal_scale() error: # of elements should be > 1 but is %d", value);
uint32_t value_u32 = (uint32_t)value;
int32_t k = 32 - LEADING_ZEROS_32(value_u32 - 1); // (1<<k)/2 < value <= (1<<k)
int64_t numerator = ((1L << 30) + 1) << k;
multiplier = numerator / value; // (1<<30) <= multiplier < (1<<31)
shift = 30 + k;
}
static int32_t apply_scale_32(int32_t value, int32_t multiplier, int32_t shift, bool double_round = true)
{
if (multiplier < 0)
{
std::string desc = "apply_scale_32() error: multiplier should >= 0 but is " + std::to_string(multiplier);
throw desc;
}
if (shift < 2 || shift > 62)
{
std::string desc =
"apply_scale_32(): shift value should stay within [2, 62] but is " + std::to_string(shift);
throw desc;
}
int64_t low_val = -1L << (shift-2);
int64_t high_val = 1L << (shift-2);
if (value < low_val || value >= high_val)
{
std::string desc =
"apply_scale_32(): value should stay within [" +
std::to_string(low_val) + ", " + std::to_string(high_val-1) +
"] but is " + std::to_string(value) + " using shift of " + std::to_string(shift);
throw desc;
}
int64_t round = 1L << (shift - 1);
if (double_round)
{
if (shift > 31 && value >= 0)
round += (1L << 30);
if (shift > 31 && value < 0)
round -= (1L << 30);
}
int64_t result = (int64_t)value * multiplier + round;
result = result >> shift;
if (result < -(1L << 31) || result >= (1L << 31))
{
std::string desc = "apply_scale_32() error: scaled result exceeds int32 numeric range";
throw desc;
}
return static_cast<int32_t>(result);
}
static int32_t apply_scale_16(int64_t value, int16_t multiplier, int32_t shift)
{
if (multiplier < 0)
{
std::string desc = "apply_scale_16() error: multiplier should >= 0 but is " + std::to_string(multiplier);
throw desc;
}
if (shift < 2 || shift > 62)
{
std::string desc =
"apply_scale_16(): shift value should stay within [2, 62] but is " + std::to_string(shift);
throw desc;
}
int64_t round = 1L << (shift - 1);
int64_t result = value * (int64_t)multiplier + round;
result = result >> shift;
if (result < -(1L << 31) || result >= (1L << 31))
{
std::string desc = "apply_scale_16() error: scaled result exceeds int32 numeric range";
throw desc;
}
return static_cast<int32_t>(result);
}
};
class TypeChecker
{
public:
static bool is_integer(DType dtype)
{
if (dtype == DType_INT4 || dtype == DType_INT8 || dtype == DType_UINT8 || dtype == DType_INT16 ||
dtype == DType_INT32 || dtype == DType_INT48)
{
return true;
}
return false;
}
};
}; // namespace TosaReference
#endif
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