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/*
* Copyright (c) 2017 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef ARM_COMPUTE_HELPERS_ASYMM_H
#define ARM_COMPUTE_HELPERS_ASYMM_H
#include "helpers.h"
/** Correctly-rounded-to-nearest division by a power-of-two.
*
* @param[in] size Size of vector.
*
* @return Correctly-rounded-to-nearest division by a power-of-two.
*/
#define ASYMM_ROUNDING_DIVIDE_BY_POW2_IMPL(size) \
inline VEC_DATA_TYPE(int, size) asymm_rounding_divide_by_POW2_##size(VEC_DATA_TYPE(int, size) x, int exponent) \
{ \
VEC_DATA_TYPE(int, size) \
mask = (1 << exponent) - 1; \
const VEC_DATA_TYPE(int, size) zero = 0; \
const VEC_DATA_TYPE(int, size) one = 1; \
VEC_DATA_TYPE(int, size) \
threshold = (mask >> 1) + select(zero, one, x < 0); \
return (x >> exponent) + select(zero, one, (x & mask) > threshold); \
}
ASYMM_ROUNDING_DIVIDE_BY_POW2_IMPL(2)
ASYMM_ROUNDING_DIVIDE_BY_POW2_IMPL(8)
ASYMM_ROUNDING_DIVIDE_BY_POW2_IMPL(16)
#define ASYMM_ROUNDING_DIVIDE_BY_POW2(x, exponent, size) asymm_rounding_divide_by_POW2_##size(x, exponent)
/** Product of two numbers, interpreting them as fixed-point values in the interval [-1, 1),
* rounding to the nearest value, and saturating -1 * -1 to the maximum value.
*
* @param[in] size Size of vector.
*
* @return Product of two fixed-point numbers.
*/
#define ASYMM_MULT_IMP(size) \
inline VEC_DATA_TYPE(int, size) asymm_mult##size(VEC_DATA_TYPE(int, size) a, VEC_DATA_TYPE(int, size) b) \
{ \
VEC_DATA_TYPE(int, size) \
overflow = a == b && a == INT_MIN; \
VEC_DATA_TYPE(long, size) \
a_64 = convert_long##size(a); \
VEC_DATA_TYPE(long, size) \
b_64 = convert_long##size(b); \
VEC_DATA_TYPE(long, size) \
ab_64 = a_64 * b_64; \
VEC_DATA_TYPE(long, size) \
mask1 = 1 << 30; \
VEC_DATA_TYPE(long, size) \
mask2 = 1 - (1 << 30); \
VEC_DATA_TYPE(long, size) \
nudge = select(mask2, mask1, ab_64 >= 0); \
VEC_DATA_TYPE(long, size) \
mask = 1ll << 31; \
VEC_DATA_TYPE(int, size) \
ab_x2_high32 = convert_int##size((ab_64 + nudge) / mask); \
return select(ab_x2_high32, INT_MAX, overflow); \
}
ASYMM_MULT_IMP(2)
ASYMM_MULT_IMP(8)
ASYMM_MULT_IMP(16)
#define ASYMM_MULT(a, b, size) asymm_mult##size(a, b)
#define ASYMM_MULT_BY_QUANT_MULTIPLIER_LESS_THAN_ONE(x, quantized_multiplier, right_shift, size) \
ASYMM_ROUNDING_DIVIDE_BY_POW2(ASYMM_MULT(x, quantized_multiplier, size), right_shift, size)
#endif // ARM_COMPUTE_HELPERS_ASYMM_H
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