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# arm_cmplx_mag_squared_q15.c

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    00001 /* ----------------------------------------------------------------------
    00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
    00003 *
    00004 * $Date:        29. November 2010
    00005 * $Revision:    V1.0.3
    00006 *
    00007 * Project:      CMSIS DSP Library
    00008 * Title:        arm_cmplx_mag_squared_q15.c
    00009 *
    00010 * Description:  Q15 complex magnitude squared.
    00011 *
    00012 * Target Processor: Cortex-M4/Cortex-M3
    00013 *
    00014 * Version 1.0.3 2010/11/29
    00015 *    Re-organized the CMSIS folders and updated documentation.
    00016 *
    00017 * Version 1.0.2 2010/11/11
    00018 *    Documentation updated.
    00019 *
    00020 * Version 1.0.1 2010/10/05
    00021 *    Production release and review comments incorporated.
    00022 *
    00023 * Version 1.0.0 2010/09/20
    00024 *    Production release and review comments incorporated.
    00025 * ---------------------------------------------------------------------------- */
    00026
    00027 #include "arm_math.h"
    00028
    00050 void arm_cmplx_mag_squared_q15(
    00051   q15_t * pSrc,
    00052   q15_t * pDst,
    00053   uint32_t numSamples)
    00054 {
    00055   q15_t real, imag;                              /* Temporary variables to store real and imaginary values */
    00056   q31_t acc0, acc1;                              /* Accumulators */
    00057   uint32_t blkCnt;                               /* loop counter */
    00058
    00059   /*loop Unrolling */
    00060   blkCnt = numSamples >> 2u;
    00061
    00062   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00063    ** a second loop below computes the remaining 1 to 3 samples. */
    00064   while(blkCnt > 0u)
    00065   {
    00066     /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
    00067     real = *pSrc++;
    00068     imag = *pSrc++;
    00069     acc0 = __SMUAD(real, real);
    00070     acc1 = __SMUAD(imag, imag);
    00071     /* store the result in 3.13 format in the destination buffer. */
    00072     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00073
    00074     real = *pSrc++;
    00075     imag = *pSrc++;
    00076     acc0 = __SMUAD(real, real);
    00077     acc1 = __SMUAD(imag, imag);
    00078     /* store the result in 3.13 format in the destination buffer. */
    00079     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00080
    00081     real = *pSrc++;
    00082     imag = *pSrc++;
    00083     acc0 = __SMUAD(real, real);
    00084     acc1 = __SMUAD(imag, imag);
    00085     /* store the result in 3.13 format in the destination buffer. */
    00086     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00087
    00088     real = *pSrc++;
    00089     imag = *pSrc++;
    00090     acc0 = __SMUAD(real, real);
    00091     acc1 = __SMUAD(imag, imag);
    00092     /* store the result in 3.13 format in the destination buffer. */
    00093     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00094
    00095     /* Decrement the loop counter */
    00096     blkCnt--;
    00097   }
    00098
    00099   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00100    ** No loop unrolling is used. */
    00101   blkCnt = numSamples % 0x4u;
    00102
    00103   while(blkCnt > 0u)
    00104   {
    00105     /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
    00106     real = *pSrc++;
    00107     imag = *pSrc++;
    00108     acc0 = __SMUAD(real, real);
    00109     acc1 = __SMUAD(imag, imag);
    00110     /* store the result in 3.13 format in the destination buffer. */
    00111     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00112
    00113     /* Decrement the loop counter */
    00114     blkCnt--;
    00115   }
    00116 }
    00117

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