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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_cmplx_mult_cmplx_f64.c
* Description: Floating-point complex-by-complex multiplication
*
* $Date: 13 September 2021
* $Revision: V1.10.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* 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 "dsp/complex_math_functions.h"
/**
@ingroup groupCmplxMath
*/
/**
@addtogroup CmplxByCmplxMult
@{
*/
/**
@brief Floating-point complex-by-complex multiplication.
@param[in] pSrcA points to first input vector
@param[in] pSrcB points to second input vector
@param[out] pDst points to output vector
@param[in] numSamples number of samples in each vector
@return none
*/
void arm_cmplx_mult_cmplx_f64(
const float64_t * pSrcA,
const float64_t * pSrcB,
float64_t * pDst,
uint32_t numSamples)
{
uint32_t blkCnt; /* Loop counter */
float64_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--;
}
}
/**
@} end of CmplxByCmplxMult group
*/
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