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/*
* Copyright (C) 2022 Arm Limited or its affiliates.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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
*
* 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.
*/
/* ----------------------------------------------------------------------
* Project: CMSIS NN Library
* Title: arm_max_pool_s16.c
* Description: Pooling function implementations
*
* $Date: 24. January 2022
* $Revision: V.1.0.0
*
* Target Processor: Cortex-M CPUs
*
* -------------------------------------------------------------------- */
#include "arm_nnfunctions.h"
#include "arm_nnsupportfunctions.h"
static void compare_and_replace_if_larger(int16_t *base, const int16_t *target, int32_t length)
{
q15_t *dst = base;
const q15_t *src = target;
union arm_nnword ref_max;
union arm_nnword comp_max;
int32_t cnt = length >> 1;
while (cnt > 0l)
{
ref_max.word = arm_nn_read_q15x2(dst);
comp_max.word = arm_nn_read_q15x2_ia(&src);
if (comp_max.half_words[0] > ref_max.half_words[0])
{
ref_max.half_words[0] = comp_max.half_words[0];
}
if (comp_max.half_words[1] > ref_max.half_words[1])
{
ref_max.half_words[1] = comp_max.half_words[1];
}
arm_nn_write_q15x2_ia(&dst, ref_max.word);
cnt--;
}
if (length & 0x1)
{
if (*src > *dst)
{
*dst = *src;
}
}
}
static void clamp_output(int16_t *source, int32_t length, const int16_t act_min, const int16_t act_max)
{
union arm_nnword in;
int32_t cnt = length >> 1;
while (cnt > 0l)
{
in.word = arm_nn_read_q15x2(source);
in.half_words[0] = MAX(in.half_words[0], act_min);
in.half_words[0] = MIN(in.half_words[0], act_max);
in.half_words[1] = MAX(in.half_words[1], act_min);
in.half_words[1] = MIN(in.half_words[1], act_max);
arm_nn_write_q15x2_ia(&source, in.word);
cnt--;
}
if (length & 0x1)
{
int16_t comp = *source;
comp = MAX(comp, act_min);
comp = MIN(comp, act_max);
*source = comp;
}
}
/**
* @ingroup groupNN
*/
/**
* @addtogroup Pooling
* @{
*/
/*
* Optimized s16 max pooling function
*
* Refer to header file for details.
*
*/
arm_status arm_max_pool_s16(const cmsis_nn_context *ctx,
const cmsis_nn_pool_params *pool_params,
const cmsis_nn_dims *input_dims,
const int16_t *src,
const cmsis_nn_dims *filter_dims,
const cmsis_nn_dims *output_dims,
int16_t *dst)
{
const int32_t input_y = input_dims->h;
const int32_t input_x = input_dims->w;
const int32_t output_y = output_dims->h;
const int32_t output_x = output_dims->w;
const int32_t stride_y = pool_params->stride.h;
const int32_t stride_x = pool_params->stride.w;
const int32_t kernel_y = filter_dims->h;
const int32_t kernel_x = filter_dims->w;
const int32_t pad_y = pool_params->padding.h;
const int32_t pad_x = pool_params->padding.w;
const int16_t act_min = pool_params->activation.min;
const int16_t act_max = pool_params->activation.max;
const int32_t channel_in = input_dims->c;
(void)ctx;
int16_t *dst_base = dst;
for (int i_y = 0, base_idx_y = -pad_y; i_y < output_y; base_idx_y += stride_y, i_y++)
{
for (int i_x = 0, base_idx_x = -pad_x; i_x < output_x; base_idx_x += stride_x, i_x++)
{
/* Condition for kernel start dimension: (base_idx_<x,y> + kernel_<x,y>_start) >= 0 */
const int32_t ker_y_start = MAX(0, -base_idx_y);
const int32_t ker_x_start = MAX(0, -base_idx_x);
/* Condition for kernel end dimension: (base_idx_<x,y> + kernel_<x,y>_end) < dim_src_<width,height> */
const int32_t kernel_y_end = MIN(kernel_y, input_y - base_idx_y);
const int32_t kernel_x_end = MIN(kernel_x, input_x - base_idx_x);
int count = 0;
for (int k_y = ker_y_start; k_y < kernel_y_end; k_y++)
{
for (int k_x = ker_x_start; k_x < kernel_x_end; k_x++)
{
const int16_t *start = src + channel_in * (k_x + base_idx_x + (k_y + base_idx_y) * input_x);
if (count == 0)
{
memcpy(dst, start, channel_in * sizeof(int16_t));
count++;
}
else
{
compare_and_replace_if_larger(dst, start, channel_in);
}
}
}
/* 'count' is expected to be non-zero here. */
dst += channel_in;
}
}
clamp_output(dst_base, output_x * output_y * channel_in, act_min, act_max);
return ARM_MATH_SUCCESS;
}
/**
* @} end of Pooling group
*/
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