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# arm_cmplx_mag_f32.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_f32.c
    00009 *
    00010 * Description:  Floating-point complex magnitude.
    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
    00070 void arm_cmplx_mag_f32(
    00071   float32_t * pSrc,
    00072   float32_t * pDst,
    00073   uint32_t numSamples)
    00074 {
    00075   uint32_t blkCnt;                               /* loop counter */
    00076   float32_t realIn, imagIn;                      /* Temporary variables to hold input values */
    00077
    00078
    00079   /*loop Unrolling */
    00080   blkCnt = numSamples >> 2u;
    00081
    00082   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00083    ** a second loop below computes the remaining 1 to 3 samples. */
    00084   while(blkCnt > 0u)
    00085   {
    00086
    00087     /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
    00088     realIn = *pSrc++;
    00089     imagIn = *pSrc++;
    00090     /* store the result in the destination buffer. */
    00091     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00092
    00093     realIn = *pSrc++;
    00094     imagIn = *pSrc++;
    00095     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00096
    00097     realIn = *pSrc++;
    00098     imagIn = *pSrc++;
    00099     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00100
    00101     realIn = *pSrc++;
    00102     imagIn = *pSrc++;
    00103     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00104
    00105
    00106     /* Decrement the loop counter */
    00107     blkCnt--;
    00108   }
    00109
    00110   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00111    ** No loop unrolling is used. */
    00112   blkCnt = numSamples % 0x4u;
    00113
    00114   while(blkCnt > 0u)
    00115   {
    00116     /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
    00117     realIn = *pSrc++;
    00118     imagIn = *pSrc++;
    00119     /* store the result in the destination buffer. */
    00120     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00121
    00122     /* Decrement the loop counter */
    00123     blkCnt--;
    00124   }
    00125 }
    00126

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