/github/workspace/src/StatisticsFunctions/kernels/plp_var_f32s_xpulpv2.c

Functions

	Name
void	plp_var_f32s_xpulpv2(const float restrict pSrc, uint32_t blockSize, float restrict pRes) Variance value of a 32-bit float vector for XPULPV2 extension.

Functions Documentation

function plp_var_f32s_xpulpv2

void plp_var_f32s_xpulpv2(
    const float *__restrict__ pSrc,
    uint32_t blockSize,
    float *__restrict__ pRes
)

Variance value of a 32-bit float vector for XPULPV2 extension.

Parameters:

• pSrc points to the input vector
• blockSize number of samples in input vector
• pRes variance value returned here

Return: none

Kernel for Statisical variance of a 32-bit float vector.

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_var_f32s_xpulpv2.c
 * Description:  Kernel to calculate the variance of a 32-bit floating point vector on XPULPV2
 *
 * $Date:        29.06.2020
 *
 * 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"
#include <float.h>

void plp_var_f32s_xpulpv2(const float *__restrict__ pSrc,
                          uint32_t blockSize,
                          float *__restrict__ pRes) {

    float square_of_mean;
    float square_of_values;

    plp_mean_f32(pSrc, blockSize, &square_of_mean);
    square_of_mean *= square_of_mean;

    plp_power_f32(pSrc, blockSize, &square_of_values);

    *pRes = (square_of_values / blockSize - square_of_mean);
}

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