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# arm_mean_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_mean_f32.c
    00009 *
    00010 * Description:  Mean value of two floating point arrays.
    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
    00061 void arm_mean_f32(
    00062   float32_t * pSrc,
    00063   uint32_t blockSize,
    00064   float32_t * pResult)
    00065 {
    00066   float32_t sum = 0.0f;                          /* Temporary result storage */
    00067   uint32_t blkCnt;                               /* loop counter */
    00068
    00069   /*loop Unrolling */
    00070   blkCnt = blockSize >> 2u;
    00071
    00072   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00073    ** a second loop below computes the remaining 1 to 3 samples. */
    00074   while(blkCnt > 0u)
    00075   {
    00076     /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
    00077     sum += *pSrc++;
    00078     sum += *pSrc++;
    00079     sum += *pSrc++;
    00080     sum += *pSrc++;
    00081
    00082     /* Decrement the loop counter */
    00083     blkCnt--;
    00084   }
    00085
    00086   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00087    ** No loop unrolling is used. */
    00088   blkCnt = blockSize % 0x4u;
    00089
    00090   while(blkCnt > 0u)
    00091   {
    00092     /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
    00093     sum += *pSrc++;
    00094
    00095     /* Decrement the loop counter */
    00096     blkCnt--;
    00097   }
    00098
    00099   /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize  */
    00100   /* Store the result to the destination */
    00101   *pResult = sum / (float32_t) blockSize;
    00102 }
    00103

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