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/* ----------------------------------------------------------------------
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* Copyright (C) 2010 ARM Limited. All rights reserved.
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*
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* $Date: 29. November 2010
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* $Revision: V1.0.3
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*
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* Project: CMSIS DSP Library
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* Title: arm_cmplx_mult_cmplx_f32.c
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*
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* Description: Floating-point complex-by-complex multiplication
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*
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* Target Processor: Cortex-M4/Cortex-M3
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*
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* Version 1.0.3 2010/11/29
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* Re-organized the CMSIS folders and updated documentation.
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*
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* Version 1.0.2 2010/11/11
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* Documentation updated.
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*
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* Version 1.0.1 2010/10/05
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* Production release and review comments incorporated.
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*
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* Version 1.0.0 2010/09/20
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* Production release and review comments incorporated.
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* -------------------------------------------------------------------- */
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#include "arm_math.h"
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/**
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* @ingroup groupCmplxMath
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*/
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/**
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* @defgroup CmplxByCmplxMult Complex-by-Complex Multiplication
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*
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* Multiplies a complex vector by another complex vector and generates a complex result.
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* The data in the complex arrays is stored in an interleaved fashion
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* (real, imag, real, imag, ...).
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* The parameter <code>numSamples</code> represents the number of complex
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* samples processed. The complex arrays have a total of <code>2*numSamples</code>
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* real values.
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*
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* The underlying algorithm is used:
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*
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* <pre>
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* for(n=0; n<numSamples; n++) {
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* pDst[(2*n)+0] = pSrcA[(2*n)+0] * pSrcB[(2*n)+0] - pSrcA[(2*n)+1] * pSrcB[(2*n)+1];
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* pDst[(2*n)+1] = pSrcA[(2*n)+0] * pSrcB[(2*n)+1] + pSrcA[(2*n)+1] * pSrcB[(2*n)+0];
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* }
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* </pre>
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*
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* There are separate functions for floating-point, Q15, and Q31 data types.
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*/
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/**
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* @addtogroup CmplxByCmplxMult
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* @{
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*/
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/**
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* @brief Floating-point complex-by-complex multiplication
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* @param[in] *pSrcA points to the first input vector
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* @param[in] *pSrcB points to the second input vector
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* @param[out] *pDst points to the output vector
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* @param[in] numSamples number of complex samples in each vector
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* @return none.
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*/
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void arm_cmplx_mult_cmplx_f32(
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float32_t * pSrcA,
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float32_t * pSrcB,
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float32_t * pDst,
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uint32_t numSamples)
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{
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float32_t a, b, c, d; /* Temporary variables to store real and imaginary values */
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uint32_t blkCnt; /* loop counters */
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/* loop Unrolling */
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blkCnt = numSamples >> 2u;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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while(blkCnt > 0u)
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{
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/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
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/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
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a = *pSrcA++;
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b = *pSrcA++;
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c = *pSrcB++;
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d = *pSrcB++;
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/* store the result in the destination buffer. */
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*pDst++ = (a * c) - (b * d);
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*pDst++ = (a * d) + (b * c);
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a = *pSrcA++;
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b = *pSrcA++;
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c = *pSrcB++;
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d = *pSrcB++;
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*pDst++ = (a * c) - (b * d);
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*pDst++ = (a * d) + (b * c);
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a = *pSrcA++;
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b = *pSrcA++;
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c = *pSrcB++;
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d = *pSrcB++;
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*pDst++ = (a * c) - (b * d);
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*pDst++ = (a * d) + (b * c);
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a = *pSrcA++;
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b = *pSrcA++;
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c = *pSrcB++;
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d = *pSrcB++;
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*pDst++ = (a * c) - (b * d);
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*pDst++ = (a * d) + (b * c);
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/* Decrement the numSamples loop counter */
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blkCnt--;
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}
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/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = numSamples % 0x4u;
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while(blkCnt > 0u)
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{
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/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
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/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
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a = *pSrcA++;
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b = *pSrcA++;
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c = *pSrcB++;
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d = *pSrcB++;
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/* store the result in the destination buffer. */
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*pDst++ = (a * c) - (b * d);
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*pDst++ = (a * d) + (b * c);
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/* Decrement the numSamples loop counter */
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blkCnt--;
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}
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}
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/**
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* @} end of CmplxByCmplxMult group
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*/
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