File content as of revision 2:da51fb522205:

/* ----------------------------------------------------------------------    
* Copyright (C) 2010 ARM Limited. All rights reserved.    
*    
* $Date:        15. February 2012  
* $Revision: 	V1.1.0  
*    
* Project: 	    CMSIS DSP Library    
* Title:		arm_cmplx_mag_f32.c    
*    
* Description:	Floating-point complex magnitude.    
*    
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*  
* Version 1.1.0 2012/02/15 
*    Updated with more optimizations, bug fixes and minor API changes.  
*   
* 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 Complex Magnitude    
 *    
 * Computes the magnitude 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] = sqrt(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    
 * @{    
 */
/**    
 * @brief Floating-point complex magnitude.    
 * @param[in]       *pSrc points to complex input buffer    
 * @param[out]      *pDst points to real output buffer    
 * @param[in]       numSamples number of complex samples in the input vector    
 * @return none.    
 *    
 */


void arm_cmplx_mag_f32(
  float32_t * pSrc,
  float32_t * pDst,
  uint32_t numSamples)
{
  float32_t realIn, imagIn;                      /* Temporary variables to hold input 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] = sqrt(A[0] * A[0] + A[1] * A[1]) */
    realIn = *pSrc++;
    imagIn = *pSrc++;
    /* store the result in the destination buffer. */
    arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

    realIn = *pSrc++;
    imagIn = *pSrc++;
    arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

    realIn = *pSrc++;
    imagIn = *pSrc++;
    arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

    realIn = *pSrc++;
    imagIn = *pSrc++;
    arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);


    /* 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] = sqrt(A[0] * A[0] + A[1] * A[1]) */
    realIn = *pSrc++;
    imagIn = *pSrc++;
    /* store the result in the destination buffer. */
    arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

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

#else

  /* Run the below code for Cortex-M0 */

  while(numSamples > 0u)
  {
    /* out = sqrt((real * real) + (imag * imag)) */
    realIn = *pSrc++;
    imagIn = *pSrc++;
    /* store the result in the destination buffer. */
    arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);

    /* Decrement the loop counter */
    numSamples--;
  }

#endif /* #ifndef ARM_MATH_CM0 */

}

/**    
 * @} end of cmplx_mag group    
 */