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/*
* Copyright (C) 2010-2021 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_relu_q15.c
* Description: Q15 version of ReLU
*
* $Date: 20. July 2021
* $Revision: V.1.0.2
*
* Target Processor: Cortex-M cores
*
* -------------------------------------------------------------------- */
#include "arm_nnfunctions.h"
#include "arm_nnsupportfunctions.h"
/**
* @ingroup groupNN
*/
/**
* @addtogroup Acti
* @{
*/
/**
* @brief Q15 RELU function
* @param[in,out] data pointer to input
* @param[in] size number of elements
*
* @details
*
* Optimized relu with QSUB instructions.
*
*/
void arm_relu_q15(q15_t *data, uint16_t size)
{
#if defined(ARM_MATH_DSP) && !defined(ARM_MATH_MVEI)
/* Run the following code for M cores with DSP extension */
uint16_t i = size >> 1;
q15_t *input = data;
q15_t *output = data;
q31_t in;
q31_t buf;
q31_t mask;
while (i)
{
in = arm_nn_read_q15x2_ia((const q15_t **)&input);
/* extract the first bit */
buf = __ROR(in & 0x80008000, 15);
/* if MSB=1, mask will be 0xFF, 0x0 otherwise */
mask = __QSUB16(0x00000000, buf);
arm_nn_write_q15x2_ia(&output, in & (~mask));
i--;
}
if (size & 0x1)
{
if (*input < 0)
{
*input = 0;
}
input++;
}
#else
/* Run the following code as reference implementation for M cores without DSP extension */
uint16_t i;
for (i = 0; i < size; i++)
{
if (data[i] < 0)
data[i] = 0;
}
#endif /* ARM_MATH_DSP */
}
/**
* @} end of Acti group
*/
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