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# arm_dot_prod_q7.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_q7.c
    00009 *
    00010 * Description:  Q7 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
    00061 void arm_dot_prod_q7(
    00062   q7_t * pSrcA,
    00063   q7_t * pSrcB,
    00064   uint32_t blockSize,
    00065   q31_t * result)
    00066 {
    00067   uint32_t blkCnt;                               /* loop counter */
    00068
    00069   q31_t sum = 0;                                 /* Temporary variables to store output */
    00070
    00071 #ifndef ARM_MATH_CM0
    00072
    00073 /* Run the below code for Cortex-M4 and Cortex-M3 */
    00074
    00075   q31_t input1, input2;                          /* Temporary variables to store input */
    00076   q15_t in1, in2;                                /* Temporary variables to store input */
    00077
    00078
    00079
    00080   /*loop Unrolling */
    00081   blkCnt = blockSize >> 2u;
    00082
    00083   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00084    ** a second loop below computes the remaining 1 to 3 samples. */
    00085   while(blkCnt > 0u)
    00086   {
    00087     /* Reading two inputs of SrcA buffer and packing */
    00088     in1 = (q15_t) * pSrcA++;
    00089     in2 = (q15_t) * pSrcA++;
    00090     input1 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16);
    00091
    00092     /* Reading two inputs of SrcB buffer and packing */
    00093     in1 = (q15_t) * pSrcB++;
    00094     in2 = (q15_t) * pSrcB++;
    00095     input2 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16);
    00096
    00097     /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
    00098     /* Perform Dot product of 2 packed inputs using SMLALD and store the result in a temporary variable. */
    00099     sum = __SMLAD(input1, input2, sum);
    00100
    00101     /* Reading two inputs of SrcA buffer and packing */
    00102     in1 = (q15_t) * pSrcA++;
    00103     in2 = (q15_t) * pSrcA++;
    00104     input1 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16);
    00105
    00106     /* Reading two inputs of SrcB buffer and packing */
    00107     in1 = (q15_t) * pSrcB++;
    00108     in2 = (q15_t) * pSrcB++;
    00109     input2 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16);
    00110
    00111     /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
    00112     /* Perform Dot product of 2 packed inputs using SMLALD and store the result in a temporary variable. */
    00113     sum = __SMLAD(input1, input2, sum);
    00114
    00115
    00116
    00117     /* Decrement the loop counter */
    00118     blkCnt--;
    00119   }
    00120
    00121   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00122    ** No loop unrolling is used. */
    00123   blkCnt = blockSize % 0x4u;
    00124
    00125   while(blkCnt > 0u)
    00126   {
    00127     /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
    00128     /* Dot product and then store the results in a temporary buffer. */
    00129     sum = __SMLAD(*pSrcA++, *pSrcB++, sum);
    00130
    00131     /* Decrement the loop counter */
    00132     blkCnt--;
    00133   }
    00134
    00135 #else
    00136
    00137   /* Run the below code for Cortex-M0 */
    00138
    00139
    00140
    00141   /* Initialize blkCnt with number of samples */
    00142   blkCnt = blockSize;
    00143
    00144   while(blkCnt > 0u)
    00145   {
    00146     /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
    00147     /* Dot product and then store the results in a temporary buffer. */
    00148     sum += (q31_t) ((q15_t) * pSrcA++ * *pSrcB++);
    00149
    00150     /* Decrement the loop counter */
    00151     blkCnt--;
    00152   }
    00153
    00154 #endif /* #ifndef ARM_MATH_CM0 */
    00155
    00156
    00157   /* Store the result in the destination buffer in 18.14 format */
    00158   *result = sum;
    00159 }
    00160

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