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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_mag_squared_f32.c
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*
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* Description: Floating-point complex magnitude squared.
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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 cmplx_mag_squared Complex Magnitude Squared
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*
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* Computes the magnitude squared of the elements of a complex data vector.
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*
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* The <code>pSrc</code> points to the source data and
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* <code>pDst</code> points to the where the result should be written.
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* <code>numSamples</code> specifies the number of complex samples
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* in the input array and the data is stored in an interleaved fashion
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* (real, imag, real, imag, ...).
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* The input array has a total of <code>2*numSamples</code> values;
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* the output array has a total of <code>numSamples</code> 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[n] = pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2;
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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 cmplx_mag_squared
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* @{
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*/
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/**
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* @brief Floating-point complex magnitude squared
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* @param[in] *pSrc points to the complex input vector
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* @param[out] *pDst points to the real output vector
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* @param[in] numSamples number of complex samples in the input vector
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* @return none.
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*/
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void arm_cmplx_mag_squared_f32(
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float32_t * pSrc,
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float32_t * pDst,
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uint32_t numSamples)
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{
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float32_t real, imag; /* Temporary variables to store real and imaginary values */
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uint32_t blkCnt; /* loop counter */
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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[0] = (A[0] * A[0] + A[1] * A[1]) */
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real = *pSrc++;
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imag = *pSrc++;
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/* store the result in the destination buffer. */
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*pDst++ = (real * real) + (imag * imag);
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real = *pSrc++;
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imag = *pSrc++;
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*pDst++ = (real * real) + (imag * imag);
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real = *pSrc++;
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imag = *pSrc++;
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*pDst++ = (real * real) + (imag * imag);
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real = *pSrc++;
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imag = *pSrc++;
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*pDst++ = (real * real) + (imag * imag);
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/* Decrement the 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[0] = (A[0] * A[0] + A[1] * A[1]) */
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real = *pSrc++;
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imag = *pSrc++;
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/* store the result in the destination buffer. */
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*pDst++ = (real * real) + (imag * imag);
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/* Decrement the 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 cmplx_mag_squared group
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*/
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