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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:        15. July 2011
    00005 * $Revision:    V1.0.10
    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/Cortex-M0
    00013 *
    00014 * Version 1.0.10 2011/7/15
    00015 *    Big Endian support added and Merged M0 and M3/M4 Source code.
    00016 *
    00017 * Version 1.0.3 2010/11/29
    00018 *    Re-organized the CMSIS folders and updated documentation.
    00019 *
    00020 * Version 1.0.2 2010/11/11
    00021 *    Documentation updated.
    00022 *
    00023 * Version 1.0.1 2010/10/05
    00024 *    Production release and review comments incorporated.
    00025 *
    00026 * Version 1.0.0 2010/09/20
    00027 *    Production release and review comments incorporated.
    00028 * ---------------------------------------------------------------------------- */
    00029
    00030 #include "arm_math.h"
    00031
    00053 void arm_cmplx_mag_squared_q15(
    00054   q15_t * pSrc,
    00055   q15_t * pDst,
    00056   uint32_t numSamples)
    00057 {
    00058   q15_t real, imag;                              /* Temporary variables to store real and imaginary values */
    00059   q31_t acc0, acc1;                              /* Accumulators */
    00060
    00061 #ifndef ARM_MATH_CM0
    00062
    00063   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00064   uint32_t blkCnt;                               /* loop counter */
    00065
    00066   /*loop Unrolling */
    00067   blkCnt = numSamples >> 2u;
    00068
    00069   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00070    ** a second loop below computes the remaining 1 to 3 samples. */
    00071   while(blkCnt > 0u)
    00072   {
    00073     /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
    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     real = *pSrc++;
    00096     imag = *pSrc++;
    00097     acc0 = __SMUAD(real, real);
    00098     acc1 = __SMUAD(imag, imag);
    00099     /* store the result in 3.13 format in the destination buffer. */
    00100     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00101
    00102     /* Decrement the loop counter */
    00103     blkCnt--;
    00104   }
    00105
    00106   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00107    ** No loop unrolling is used. */
    00108   blkCnt = numSamples % 0x4u;
    00109
    00110   while(blkCnt > 0u)
    00111   {
    00112     /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
    00113     real = *pSrc++;
    00114     imag = *pSrc++;
    00115     acc0 = __SMUAD(real, real);
    00116     acc1 = __SMUAD(imag, imag);
    00117     /* store the result in 3.13 format in the destination buffer. */
    00118     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00119
    00120     /* Decrement the loop counter */
    00121     blkCnt--;
    00122   }
    00123
    00124 #else
    00125
    00126   /* Run the below code for Cortex-M0 */
    00127
    00128   while(numSamples > 0u)
    00129   {
    00130     /* out = ((real * real) + (imag * imag)) */
    00131     real = *pSrc++;
    00132     imag = *pSrc++;
    00133     acc0 = (real * real);
    00134     acc1 = (imag * imag);
    00135     /* store the result in 3.13 format in the destination buffer. */
    00136     *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17);
    00137
    00138     /* Decrement the loop counter */
    00139     numSamples--;
    00140   }
    00141
    00142 #endif /* #ifndef ARM_MATH_CM0 */
    00143
    00144 }
    00145

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