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/*
* Copyright (C) 2010-2018 Arm Limited or its affiliates. All rights reserved.
*
* 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_nn_add_q7.c
* Description: Non saturating addition of elements of a q7 vector.
*
* $Date: 20. July 2021
* $Revision: V.1.1.1
*
* Target Processor: Cortex-M cores
*
* -------------------------------------------------------------------- */
#include "arm_nn_tables.h"
#include "arm_nnsupportfunctions.h"
/**
* @ingroup groupSupport
*/
/**
* @addtogroup NNBasicMath
* @{
*/
void arm_nn_add_q7(const q7_t *input, q31_t *output, uint32_t block_size)
{
uint32_t block_count;
q31_t result = 0;
#if defined(ARM_MATH_DSP) && !defined(ARM_MATH_MVEI)
/* Loop unrolling: Compute 4 outputs at a time */
block_count = block_size >> 2U;
while (block_count > 0U)
{
const int32_t mult_q15x2 = (1UL << 16) | 1UL;
q31_t in_q7x4 = arm_nn_read_q7x4_ia(&input);
q31_t temp_q15x2 = __SXTAB16(__SXTB16(in_q7x4), __ROR((uint32_t)in_q7x4, 8));
result = __SMLAD(temp_q15x2, mult_q15x2, result);
/* Decrement loop counter */
block_count--;
}
/* Loop unrolling: Compute remaining outputs */
block_count = block_size & 0x3;
#else
block_count = block_size;
#endif
while (block_count > 0U)
{
/* Add and store result in destination buffer. */
result += *input++;
/* Decrement loop counter */
block_count--;
}
*output = result;
}
/**
* @} end of NNBasicMath group
*/
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