arm_cmplx_mag_squared_f32.c
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| text/x-c
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CLexer
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r41 | /* ---------------------------------------------------------------------- | ||
* Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
* | ||||
* $Date: 15. July 2011 | ||||
* $Revision: V1.0.10 | ||||
* | ||||
* Project: CMSIS DSP Library | ||||
* Title: arm_cmplx_mag_squared_f32.c | ||||
* | ||||
* Description: Floating-point complex magnitude squared. | ||||
* | ||||
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 | ||||
* | ||||
* Version 1.0.10 2011/7/15 | ||||
* Big Endian support added and Merged M0 and M3/M4 Source code. | ||||
* | ||||
* Version 1.0.3 2010/11/29 | ||||
* Re-organized the CMSIS folders and updated documentation. | ||||
* | ||||
* Version 1.0.2 2010/11/11 | ||||
* Documentation updated. | ||||
* | ||||
* Version 1.0.1 2010/10/05 | ||||
* Production release and review comments incorporated. | ||||
* | ||||
* Version 1.0.0 2010/09/20 | ||||
* Production release and review comments incorporated. | ||||
* ---------------------------------------------------------------------------- */ | ||||
#include "arm_math.h" | ||||
/** | ||||
* @ingroup groupCmplxMath | ||||
*/ | ||||
/** | ||||
* @defgroup cmplx_mag_squared Complex Magnitude Squared | ||||
* | ||||
* Computes the magnitude squared of the elements of a complex data vector. | ||||
* | ||||
* The <code>pSrc</code> points to the source data and | ||||
* <code>pDst</code> points to the where the result should be written. | ||||
* <code>numSamples</code> specifies the number of complex samples | ||||
* in the input array and the data is stored in an interleaved fashion | ||||
* (real, imag, real, imag, ...). | ||||
* The input array has a total of <code>2*numSamples</code> values; | ||||
* the output array has a total of <code>numSamples</code> values. | ||||
* | ||||
* The underlying algorithm is used: | ||||
* | ||||
* <pre> | ||||
* for(n=0; n<numSamples; n++) { | ||||
* pDst[n] = pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2; | ||||
* } | ||||
* </pre> | ||||
* | ||||
* There are separate functions for floating-point, Q15, and Q31 data types. | ||||
*/ | ||||
/** | ||||
* @addtogroup cmplx_mag_squared | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Floating-point complex magnitude squared | ||||
* @param[in] *pSrc points to the complex input vector | ||||
* @param[out] *pDst points to the real output vector | ||||
* @param[in] numSamples number of complex samples in the input vector | ||||
* @return none. | ||||
*/ | ||||
void arm_cmplx_mag_squared_f32( | ||||
float32_t * pSrc, | ||||
float32_t * pDst, | ||||
uint32_t numSamples) | ||||
{ | ||||
float32_t real, imag; /* Temporary variables to store real and imaginary values */ | ||||
#ifndef ARM_MATH_CM0 | ||||
/* Run the below code for Cortex-M4 and Cortex-M3 */ | ||||
uint32_t blkCnt; /* loop counter */ | ||||
/*loop Unrolling */ | ||||
blkCnt = numSamples >> 2u; | ||||
/* First part of the processing with loop unrolling. Compute 4 outputs at a time. | ||||
** a second loop below computes the remaining 1 to 3 samples. */ | ||||
while(blkCnt > 0u) | ||||
{ | ||||
/* C[0] = (A[0] * A[0] + A[1] * A[1]) */ | ||||
real = *pSrc++; | ||||
imag = *pSrc++; | ||||
/* store the result in the destination buffer. */ | ||||
*pDst++ = (real * real) + (imag * imag); | ||||
real = *pSrc++; | ||||
imag = *pSrc++; | ||||
*pDst++ = (real * real) + (imag * imag); | ||||
real = *pSrc++; | ||||
imag = *pSrc++; | ||||
*pDst++ = (real * real) + (imag * imag); | ||||
real = *pSrc++; | ||||
imag = *pSrc++; | ||||
*pDst++ = (real * real) + (imag * imag); | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
/* If the numSamples is not a multiple of 4, compute any remaining output samples here. | ||||
** No loop unrolling is used. */ | ||||
blkCnt = numSamples % 0x4u; | ||||
while(blkCnt > 0u) | ||||
{ | ||||
/* C[0] = (A[0] * A[0] + A[1] * A[1]) */ | ||||
real = *pSrc++; | ||||
imag = *pSrc++; | ||||
/* store the result in the destination buffer. */ | ||||
*pDst++ = (real * real) + (imag * imag); | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
#else | ||||
/* Run the below code for Cortex-M0 */ | ||||
while(numSamples > 0u) | ||||
{ | ||||
/* reading real and imaginary values */ | ||||
real = *pSrc++; | ||||
imag = *pSrc++; | ||||
/* out = (real * real) + (imag * imag) */ | ||||
/* store the result in the destination buffer. */ | ||||
*pDst++ = (real * real) + (imag * imag); | ||||
/* Decrement the loop counter */ | ||||
numSamples--; | ||||
} | ||||
#endif /* #ifndef ARM_MATH_CM0 */ | ||||
} | ||||
/** | ||||
* @} end of cmplx_mag_squared group | ||||
*/ | ||||