/github/workspace/src/StatisticsFunctions/kernels/plp_std_q8s_rv32im.c

Functions

	Name
void	plp_std_q8s_rv32im(const int8_t restrict pSrc, uint32_t blockSize, uint32_t fracBits, int8_t restrict pRes) Standard deviation of a 8-bit fixed point vector for RV32IM extension.

Functions Documentation

function plp_std_q8s_rv32im

void plp_std_q8s_rv32im(
    const int8_t *__restrict__ pSrc,
    uint32_t blockSize,
    uint32_t fracBits,
    int8_t *__restrict__ pRes
)

Standard deviation of a 8-bit fixed point vector for RV32IM extension.

Parameters:

• pSrc points to the input vector
• blockSize number of samples in input vector
• pRes standard deviation returned here

Return: none

Statisical standard deviation of a 8-bit fixed point vector for RV32IM extension.

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_std_q8s_rv32im.c
 * Description:  Kernel to calculate the standard deviation of a 8-bit fixed point vector glue code
 *on RV32IM
 *
 * $Date:        30.06.2020
 *
 * Target Processor: PULP cores
 * ===================================================================== */
/*
 * Copyright (C) 2020 ETH Zurich and University of Bologna.
 *
 * Author: Moritz Scherer, ETH Zurich
 *
 * 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.
 */

#include "plp_math.h"

void plp_std_q8s_rv32im(const int8_t *__restrict__ pSrc,
                        uint32_t blockSize,
                        uint32_t fracBits,
                        int8_t *__restrict__ pRes) {

    int8_t variance;
    int16_t final;
    int16_t intermediate;

    plp_var_q8(pSrc, blockSize, fracBits, &variance);

    intermediate = variance;

    plp_sqrt_q16(&intermediate, fracBits, &final);

    *pRes = (int8_t) final;
}

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Updated on 2023-03-01 at 16:16:33 +0000