/github/workspace/src/ComplexMathFunctions/kernels/plp_cmplx_mult_cmplx_i16_rv32im.c

Functions

	Name
void	plp_cmplx_mult_cmplx_i16_rv32im(const int16_t restrict pSrcA, const int16_t restrict pSrcB, int16_t *restrict pDst, uint32_t numSamples) 16-bit integer complex-by-complex multiplication

Functions Documentation

function plp_cmplx_mult_cmplx_i16_rv32im

void plp_cmplx_mult_cmplx_i16_rv32im(
    const int16_t *__restrict__ pSrcA,
    const int16_t *__restrict__ pSrcB,
    int16_t *__restrict__ pDst,
    uint32_t numSamples
)

16-bit integer complex-by-complex multiplication

Parameters:

• pSrcA points to first input vector
• pSrcB points to second input vector
• pDst points to output vector
• numSamples number of samples in each vector

Return: none

16-bit integer complex multiplied by complex.

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_cmplx_mult_cmplx_i16_rv32im.c
 * Description:  16-bit integer complex-by-complex multiplication glue code
 *
 * $Date:        29. June 2020
 * $Revision:    V0
 *
 * Target Processor: PULP cores
 * ===================================================================== */
/*
 * Copyright (C) 2019 ETH Zurich and Ubiversity of Bologna.
 *
 * Author: Hanna Mueller, 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.
 *
 * Notice: project inspired by ARM CMSIS DSP and parts of source code
  ported and adopted for RISC-V PULP platform from ARM CMSIS DSP
 released under Copyright (C) 2010-2019 ARM Limited or its affiliates
  with Apache-2.0.
 */

#include "plp_math.h"

void plp_cmplx_mult_cmplx_i16_rv32im(const int16_t *__restrict__ pSrcA,
                                     const int16_t *__restrict__ pSrcB,
                                     int16_t *__restrict__ pDst,
                                     uint32_t numSamples) {
    uint32_t blkCnt;    /* Loop counter */
    int16_t a, b, c, d; /* Temporary variables to store real and imaginary values */

    /* Initialize blkCnt with number of samples */
    blkCnt = numSamples;
    while (blkCnt > 0U) {
        /* C[2 * i    ] = A[2 * i] * B[2 * i    ] - A[2 * i + 1] * B[2 * i + 1]. */
        /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i    ]. */

        a = *pSrcA++;
        b = *pSrcA++;
        c = *pSrcB++;
        d = *pSrcB++;

        /* store result in destination buffer. */
        *pDst++ = (a * c) - (b * d);
        *pDst++ = (a * d) + (b * c);

        /* Decrement loop counter */
        blkCnt--;
    }
}

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Updated on 2023-03-01 at 16:16:32 +0000