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Functions

Name
void plp_cmplx_mult_cmplx_q8_xpulpv2(const int8_t restrict pSrcA, const int8_t restrict pSrcB, int8_t *restrict pDst, uint32_t deciPoint, uint32_t numSamples)
16-bit integer complex-by-complex multiplication

Functions Documentation

function plp_cmplx_mult_cmplx_q8_xpulpv2

void plp_cmplx_mult_cmplx_q8_xpulpv2(
    const int8_t *__restrict__ pSrcA,
    const int8_t *__restrict__ pSrcB,
    int8_t *__restrict__ pDst,
    uint32_t deciPoint,
    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
  • deciPoint decimal point for right shift
  • numSamples number of samples in each vector

Return: none

8-bit fixed-point complex multiplied by complex.

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_cmplx_mult_cmplx_f32_xpulpv2.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_q8_xpulpv2(const int8_t *__restrict__ pSrcA,
                                     const int8_t *__restrict__ pSrcB,
                                     int8_t *__restrict__ pDst,
                                     uint32_t deciPoint,
                                     uint32_t numSamples) {
    uint32_t blkCnt;   /* Loop counter */
    int8_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++ = __ROUNDNORM_REG((a * c), deciPoint) - __ROUNDNORM_REG((b * d), deciPoint);
        *pDst++ = __ROUNDNORM_REG((a * d), deciPoint) + __ROUNDNORM_REG((b * c), deciPoint);

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

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