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# arm_dot_prod_f32.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_dot_prod_f32.c
    00009 *
    00010 * Description:  Floating-point dot product.
    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 * Version 0.0.7  2010/06/10
    00030 *    Misra-C changes done
    00031 * ---------------------------------------------------------------------------- */
    00032
    00033 #include "arm_math.h"
    00034
    00062 void arm_dot_prod_f32(
    00063   float32_t * pSrcA,
    00064   float32_t * pSrcB,
    00065   uint32_t blockSize,
    00066   float32_t * result)
    00067 {
    00068   float32_t sum = 0.0f;                          /* Temporary result storage */
    00069   uint32_t blkCnt;                               /* loop counter */
    00070
    00071
    00072 #ifndef ARM_MATH_CM0
    00073
    00074 /* Run the below code for Cortex-M4 and Cortex-M3 */
    00075   /*loop Unrolling */
    00076   blkCnt = blockSize >> 2u;
    00077
    00078   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00079    ** a second loop below computes the remaining 1 to 3 samples. */
    00080   while(blkCnt > 0u)
    00081   {
    00082     /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
    00083     /* Calculate dot product and then store the result in a temporary buffer */
    00084     sum += (*pSrcA++) * (*pSrcB++);
    00085     sum += (*pSrcA++) * (*pSrcB++);
    00086     sum += (*pSrcA++) * (*pSrcB++);
    00087     sum += (*pSrcA++) * (*pSrcB++);
    00088
    00089     /* Decrement the loop counter */
    00090     blkCnt--;
    00091   }
    00092
    00093   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00094    ** No loop unrolling is used. */
    00095   blkCnt = blockSize % 0x4u;
    00096
    00097 #else
    00098
    00099   /* Run the below code for Cortex-M0 */
    00100
    00101   /* Initialize blkCnt with number of samples */
    00102   blkCnt = blockSize;
    00103
    00104 #endif /* #ifndef ARM_MATH_CM0 */
    00105
    00106
    00107   while(blkCnt > 0u)
    00108   {
    00109     /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
    00110     /* Calculate dot product and then store the result in a temporary buffer. */
    00111     sum += (*pSrcA++) * (*pSrcB++);
    00112
    00113     /* Decrement the loop counter */
    00114     blkCnt--;
    00115   }
    00116   /* Store the result back in the destination buffer */
    00117   *result = sum;
    00118 }
    00119

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