| // Copyright (c) Facebook, Inc. and its affiliates. |
| // All rights reserved. |
| // |
| // Copyright 2019 Google LLC |
| // |
| // This source code is licensed under the BSD-style license found in the |
| // LICENSE file in the root directory of this source tree. |
| |
| #pragma once |
| |
| #if defined(__cplusplus) && (__cplusplus >= 201103L) |
| #include <cstdint> |
| #include <cstddef> |
| #include <cassert> |
| #include <cmath> |
| #else |
| #include <stdint.h> |
| #include <stddef.h> |
| #include <assert.h> |
| #include <math.h> |
| #endif |
| |
| #include <fp16.h> |
| |
| #include <xnnpack/common.h> |
| #include <xnnpack/params.h> |
| #include <xnnpack/scalar-utils.h> |
| |
| |
| static inline uint8_t xnn_q31_requantize( |
| int32_t n, |
| union xnn_q31_requantization_params params) |
| { |
| const int64_t product = (int64_t) n * (int64_t) params.scalar.multiplier; |
| const int32_t q31product = (int32_t) (uint32_t) ((uint64_t) (product + INT64_C(0x40000000)) >> 31); |
| const int32_t remainder = (q31product & params.scalar.remainder_mask) - (int32_t) (n < 0); |
| n = asr_s32(q31product, params.scalar.shift) + (int32_t) (remainder > params.scalar.remainder_threshold); |
| if (n < params.scalar.min_less_zero_point) { |
| n = params.scalar.min_less_zero_point; |
| } |
| if (n > params.scalar.max_less_zero_point) { |
| n = params.scalar.max_less_zero_point; |
| } |
| |
| return (uint8_t) (n + params.scalar.zero_point); |
| } |
| |
| static inline uint8_t xnn_avgpool_quantize( |
| int32_t n, |
| union xnn_q8_avgpool_params params) |
| { |
| const int64_t product = (int64_t) n * (int64_t) params.scalar.multiplier; |
| const int64_t adjusted_product = product - (int64_t) (n < 0); |
| |
| n = (int32_t) asr_s64(adjusted_product + params.scalar.rounding, params.scalar.right_shift); |
| if (n < params.scalar.output_min_less_zero_point) { |
| n = params.scalar.output_min_less_zero_point; |
| } |
| if (n > params.scalar.output_max_less_zero_point) { |
| n = params.scalar.output_max_less_zero_point; |
| } |
| |
| return (uint8_t) (n + params.scalar.output_zero_point); |
| } |
| |
| static inline uint8_t xnn_add_quantize( |
| uint8_t a, uint8_t b, |
| union xnn_q8_add_params params) |
| { |
| // Multiply by factors and accumulate products. |
| int32_t acc = params.scalar.zero_point_product + |
| (int32_t) ((uint32_t) a * params.scalar.a_multiplier) + |
| (int32_t) ((uint32_t) b * params.scalar.b_multiplier); |
| |
| // Shift right and round. |
| const int32_t rem = (acc & params.scalar.remainder_mask) - (int32_t) (acc < 0); |
| acc = asr_s32(acc, params.scalar.shift) + (int32_t) (rem > params.scalar.remainder_threshold); |
| |
| // Clamp and add output zero point. |
| int32_t y = acc + params.scalar.y_zero_point; |
| if (y >= params.scalar.y_max) { |
| y = params.scalar.y_max; |
| } |
| if (y <= params.scalar.y_min) { |
| y = params.scalar.y_min; |
| } |
| return (uint8_t) y; |
| } |