110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
/*
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* Copyright (C) 2010-2021 Arm Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* ----------------------------------------------------------------------
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* Project: CMSIS NN Library
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* Title: arm_relu_q7.c
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* Description: Q7 version of ReLU
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*
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* $Date: 20. July 2021
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* $Revision: V.1.1.3
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*
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* Target Processor: Cortex-M cores
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*
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* -------------------------------------------------------------------- */
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#include "arm_nnfunctions.h"
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#include "arm_nnsupportfunctions.h"
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/**
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* @ingroup groupNN
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*/
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/**
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* @addtogroup Acti
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* @{
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*/
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/**
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* @brief Q7 RELU function
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* @param[in,out] data pointer to input
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* @param[in] size number of elements
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*
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* @details
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*
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* Optimized relu with QSUB instructions.
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*
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*/
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void arm_relu_q7(q7_t *data, uint16_t size)
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{
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#if defined(ARM_MATH_DSP) && !defined(ARM_MATH_MVEI)
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/* Run the following code for M cores with DSP extension */
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uint16_t i = size >> 2;
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q7_t *input = data;
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q7_t *output = data;
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q31_t in;
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q31_t buf;
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q31_t mask;
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while (i)
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{
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in = arm_nn_read_q7x4_ia((const q7_t **)&input);
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/* extract the first bit */
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buf = (int32_t)__ROR((uint32_t)in & 0x80808080, 7);
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/* if MSB=1, mask will be 0xFF, 0x0 otherwise */
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mask = __QSUB8(0x00000000, buf);
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arm_nn_write_q7x4_ia(&output, in & (~mask));
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i--;
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}
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i = size & 0x3;
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while (i)
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{
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if (*input < 0)
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{
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*input = 0;
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}
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input++;
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i--;
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}
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#else
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/* Run the following code as reference implementation for cores without DSP extension */
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uint16_t i;
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for (i = 0; i < size; i++)
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{
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if (data[i] < 0)
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data[i] = 0;
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}
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#endif
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}
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/**
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* @} end of Acti group
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*/
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