/github/workspace/src/MatrixFunctions/mat_mult_cmplx/kernels/plp_mat_mult_cmplx_q16p_xpulpv2.c

Functions

	Name
void	plp_mat_mult_cmplx_q16p_xpulpv2(void * args) parallel matrix matrix multiplication for complex 16-bit fix-point on XpulpV2

Defines

	Name
	BASIC_VERSION

Functions Documentation

function plp_mat_mult_cmplx_q16p_xpulpv2

void plp_mat_mult_cmplx_q16p_xpulpv2(
    void * args
)

parallel matrix matrix multiplication for complex 16-bit fix-point on XpulpV2

Parameters:

• args pointer to plp_mat_mat_mult_cmplx_instance_q16 struct initialized by plp_mat_mult_cmplx_q16_parallel

Return: none

Par:

• Fix-Point

Fix-Point and Shifting The result will be shifted by the parameter shift to the right (which corresponds to a multiplication by 2^-shift). Assume that matrix A is represente as pSrcA * 2^-x and matrix B as pSrcB * 2^-y (which means that A has x, and B has y bits after the binary point). Then, the output matrix C is represented as pDstC * 2^-(x + y - shift). The output matrix is also stored with the same number of bits as the inputs. Set the shift parameter such that no overflow occurrs. * Exploiting SIMD instructions

The 16 bit values are packed two each into 32 bit vectors and then the two dot products are performed on 32 bit vectors, with 32 bit accumulator.

Macros Documentation

define BASIC_VERSION

#define BASIC_VERSION 

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_mat_mult_cmplx_q16p_xpulpv2.c
 * Description:  parallel 16-bit fix-point complex matrix matrix multiplication 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_mult_cmplx_q16p_xpulpv2(void *args) {

    int core_id = hal_core_id();

    plp_mat_mult_cmplx_instance_q16 *a = (plp_mat_mult_cmplx_instance_q16 *)args;

    const int16_t *__restrict__ pSrcA = a->pSrcA;
    const int16_t *__restrict__ pSrcB = a->pSrcB;
    uint32_t M = a->M;
    uint32_t N = a->N;
    uint32_t O = a->O;
    uint32_t shift = a->shift;
    uint32_t nPE = a->nPE;
    int16_t *__restrict__ pDstC = a->pDstC;

#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 o = 0; o < O; o++) {
            int32_t sum_re = 0;
            int32_t sum_im = 0;
            for (int n = 0; n < N; n++) {
                int32_t a_re = (int32_t)pSrcA[(m * N + n) * 2 + 0];
                int32_t a_im = (int32_t)pSrcA[(m * N + n) * 2 + 1];
                int32_t b_re = (int32_t)pSrcB[(n * O + o) * 2 + 0];
                int32_t b_im = (int32_t)pSrcB[(n * O + o) * 2 + 1];
                sum_re += __ROUNDNORM_REG(a_re * b_re - a_im * b_im, shift);
                sum_im += __ROUNDNORM_REG(a_re * b_im + a_im * b_re, shift);
            }
            pDstC[(m * O + o) * 2 + 0] = (int16_t)sum_re;
            pDstC[(m * O + o) * 2 + 1] = (int16_t)sum_im;
        }
    }

#else

    // TODO: Hackathon

#endif
#undef BASIC_VERSION
}

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