/github/workspace/src/MatrixFunctionsStride/mat_sub_stride/kernels/plp_mat_sub_stride_i8s_xpulpv2.c

Functions

	Name
void	plp_mat_sub_stride_i8s_xpulpv2(const int8_t restrict pSrcA, const int8_t restrict pSrcB, uint32_t M, uint32_t N, uint32_t strideA, uint32_t strideB, uint32_t strideY, int8_t *restrict pDst) strided matrix subtraction of 8-bit integer matrices kernel for XPULPV2 extension.

Functions Documentation

function plp_mat_sub_stride_i8s_xpulpv2

void plp_mat_sub_stride_i8s_xpulpv2(
    const int8_t *__restrict__ pSrcA,
    const int8_t *__restrict__ pSrcB,
    uint32_t M,
    uint32_t N,
    uint32_t strideA,
    uint32_t strideB,
    uint32_t strideY,
    int8_t *__restrict__ pDst
)

strided matrix subtraction of 8-bit integer matrices kernel for XPULPV2 extension.

Parameters:

• pSrcA Points to the first input matrix
• pSrcB Points to the second input matrix
• M Height of all matrices
• N Width of all matrices
• strideA Stride of matrix A (elements between each row)
• strideB Stride of matrid B (elements between each row)
• strideY Stride of output matrix (elements between each row)
• pDst Points to the output matrix

Return: none

matrix subtraction of a 8-bit integer matrices for XPULPV2 extension.

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_mat_sub_stride_i8s_xpulpv2.c
 * Description:  8-bit integer strided matrix subtraction for XPULPV2
 *
 * $Date:        1. July 2020
 * $Revision:    V0
 *
 * Target Processor: PULP cores
 * ===================================================================== */
/*
 * Copyright (C) 2020 ETH Zurich and University of Bologna.
 *
 * Author: Tibor Schneider, 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_mat_sub_stride_i8s_xpulpv2(const int8_t *__restrict__ pSrcA,
                                    const int8_t *__restrict__ pSrcB,
                                    uint32_t M,
                                    uint32_t N,
                                    uint32_t strideA,
                                    uint32_t strideB,
                                    uint32_t strideY,
                                    int8_t *__restrict__ pDst) {

//#define BASIC_VERSION // if used don't forget to also use the undefine at end of file
#ifdef BASIC_VERSION

    uint32_t m, n; // loop counters

    for (m = 0; m < M; m++) {
        for (n = 0; n < N; n++) {
            pDst[m * strideY + n] = pSrcA[m * strideA + n] - pSrcB[m * strideB + n];
        }
    }

#else

    uint32_t m, n; // loop counters

    const int8_t *__restrict__ pSrcA2 = pSrcA + strideA;
    const int8_t *__restrict__ pSrcB2 = pSrcB + strideB;
    int8_t *__restrict__ pDst2 = pDst + strideY;

    unsigned int m_iter = M >> 1;
    unsigned int m_rem = M & 0x1;

    unsigned int n_iter = N >> 2;
    unsigned int n_rem = N & 0x3;

    unsigned int step_a = strideA * 2 - N;
    unsigned int step_b = strideB * 2 - N;
    unsigned int step_y = strideY * 2 - N;

    for (m = 0; m < m_iter; m++) {
        for (n = 0; n < n_iter; n++) {
            v4s a1 = *((v4s *)pSrcA);
            v4s b1 = *((v4s *)pSrcB);
            v4s a2 = *((v4s *)pSrcA2);
            v4s b2 = *((v4s *)pSrcB2);
            *((v4s *)pDst) = __SUB4(a1, b1);
            *((v4s *)pDst2) = __SUB4(a2, b2);
            pSrcA += 4;
            pSrcB += 4;
            pDst += 4;
            pSrcA2 += 4;
            pSrcB2 += 4;
            pDst2 += 4;
        }
        for (n = 0; n < n_rem; n++) {
            *pDst++ = *pSrcA++ - *pSrcB++;
            *pDst2++ = *pSrcA2++ - *pSrcB2++;
        }
        pSrcA += step_a;
        pSrcB += step_b;
        pDst += step_y;
        pSrcA2 += step_a;
        pSrcB2 += step_b;
        pDst2 += step_y;
    }

    if (m_rem) {
        for (n = 0; n < n_iter; n++) {
            v4s a = *((v4s *)pSrcA);
            v4s b = *((v4s *)pSrcB);
            *((v4s *)pDst) = __SUB4(a, b);
            pSrcA += 4;
            pSrcB += 4;
            pDst += 4;
        }
        for (n = 0; n < n_rem; n++) {
            *pDst++ = *pSrcA++ - *pSrcB++;
        }
        pSrcA += step_a;
        pSrcB += step_b;
        pDst += step_y;
    }

#endif
    //#undef BASIC_VERSION
}

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