/github/workspace/src/MatrixFunctionsStride/mat_copy_stride/kernels/plp_mat_copy_stride_i8p_xpulpv2.c

Functions

	Name
void	plp_mat_copy_stride_i8p_xpulpv2(void * args) Copy an MxN strided 8-bit integers matrix on XpulpV2 in parallel.

Functions Documentation

function plp_mat_copy_stride_i8p_xpulpv2

void plp_mat_copy_stride_i8p_xpulpv2(
    void * args
)

Copy an MxN strided 8-bit integers matrix on XpulpV2 in parallel.

Parameters:

• args pointer to plp_mat_mat_copy_stride_instance_i8 struct initialized by plp_mat_copy_stride_i8_parallel

Return: none

Par: Exploiting SIMD instructions

The 8 bit values are packed four each into 32 bit vectors and then the four dot products are performed on 32 bit vectors, with 32 bit accumulator.

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_mat_copy_stride_i8p_xpulpv2.c
 * Description:  parallel 8-bit integer strided matrix copy for XPULPV2
 *
 * $Date:        17. July 2020
 * $Revision:    V0
 *
 * Target Processor: PULP cores
 * ===================================================================== */
/*
 * Copyright (C) 2020 ETH Zurich and Ubiversity of Bologna. All rights reserved.
 *
 * 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_copy_stride_i8p_xpulpv2(void *args) {

    int core_id = hal_core_id();

    plp_mat_copy_stride_instance_i8 *a = (plp_mat_copy_stride_instance_i8 *)args;

    const int8_t *__restrict__ pSrc = a->pSrc;
    uint32_t M = a->M;
    uint32_t N = a->N;
    uint32_t strideSrc = a->strideSrc;
    uint32_t strideDst = a->strideDst;
    uint32_t nPE = a->nPE;
    int8_t *__restrict__ pDst = a->pDst;

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

    for (int m = core_id; m < M; m += nPE) {
        for (int n = 0; n < N; n++) {
            pDst[m * strideDst + n] = pSrc[m * strideSrc + n];
        }
    }

#else

    unsigned int m;
    unsigned int n;

    unsigned int n_iter = N >> 2;
    unsigned int n_rem = N & 0x00000003;

    pSrc = pSrc + strideSrc * core_id;
    pDst = pDst + strideDst * core_id;

    unsigned int src_offset = (strideSrc * nPE) - N;
    unsigned int dst_offset = (strideDst * nPE) - N;

    for (m = core_id; m < M; m += nPE) {
        for (n = 0; n < n_iter; n++) {
            *((int32_t *)pDst) = *((int32_t *)pSrc);
            pDst += 4;
            pSrc += 4;
        }
        for (n = 0; n < n_rem; n++) {
            *pDst++ = *pSrc++;
        }
        pSrc += src_offset;
        pDst += dst_offset;
    }

#endif
    //#undef BASIC_VERSION
}

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