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# arm_mat_add_q31.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_mat_add_q31.c
    00009 *
    00010 * Description:  Q31 matrix addition
    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 0.0.5  2010/04/26
    00030 *    incorporated review comments and updated with latest CMSIS layer
    00031 *
    00032 * Version 0.0.3  2010/03/10
    00033 *    Initial version
    00034 * -------------------------------------------------------------------- */
    00035
    00036 #include "arm_math.h"
    00037
    00061 arm_status arm_mat_add_q31(
    00062   const arm_matrix_instance_q31 * pSrcA,
    00063   const arm_matrix_instance_q31 * pSrcB,
    00064   arm_matrix_instance_q31 * pDst)
    00065 {
    00066   q31_t *pIn1 = pSrcA->pData;                    /* input data matrix pointer A */
    00067   q31_t *pIn2 = pSrcB->pData;                    /* input data matrix pointer B */
    00068   q31_t *pOut = pDst->pData;                     /* output data matrix pointer */
    00069   uint32_t numSamples;                           /* total number of elements in the matrix  */
    00070   uint32_t blkCnt;                               /* loop counters */
    00071   arm_status status;                             /* status of matrix addition */
    00072
    00073 #ifdef ARM_MATH_MATRIX_CHECK
    00074
    00075
    00076   /* Check for matrix mismatch condition */
    00077   if((pSrcA->numRows != pSrcB->numRows) ||
    00078      (pSrcA->numCols != pSrcB->numCols) ||
    00079      (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
    00080   {
    00081     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00082     status = ARM_MATH_SIZE_MISMATCH;
    00083   }
    00084   else
    00085 #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
    00086
    00087   {
    00088     /* Total number of samples in the input matrix */
    00089     numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
    00090
    00091 #ifndef ARM_MATH_CM0
    00092
    00093     /* Run the below code for Cortex-M4 and Cortex-M3 */
    00094
    00095     /* Loop Unrolling */
    00096     blkCnt = numSamples >> 2u;
    00097
    00098
    00099     /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00100      ** a second loop below computes the remaining 1 to 3 samples. */
    00101     while(blkCnt > 0u)
    00102     {
    00103       /* C(m,n) = A(m,n) + B(m,n) */
    00104       /* Add, saturate and then store the results in the destination buffer. */
    00105       *pOut++ = __QADD(*pIn1++, *pIn2++);
    00106       *pOut++ = __QADD(*pIn1++, *pIn2++);
    00107       *pOut++ = __QADD(*pIn1++, *pIn2++);
    00108       *pOut++ = __QADD(*pIn1++, *pIn2++);
    00109
    00110       /* Decrement the loop counter */
    00111       blkCnt--;
    00112     }
    00113
    00114     /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00115      ** No loop unrolling is used. */
    00116     blkCnt = numSamples % 0x4u;
    00117
    00118     while(blkCnt > 0u)
    00119     {
    00120       /* C(m,n) = A(m,n) + B(m,n) */
    00121       /* Add, saturate and then store the results in the destination buffer. */
    00122       *pOut++ = __QADD(*pIn1++, *pIn2++);
    00123
    00124       /* Decrement the loop counter */
    00125       blkCnt--;
    00126     }
    00127
    00128 #else
    00129
    00130     /* Run the below code for Cortex-M0 */
    00131
    00132     /* Initialize blkCnt with number of samples */
    00133     blkCnt = numSamples;
    00134
    00135     while(blkCnt > 0u)
    00136     {
    00137       /* C(m,n) = A(m,n) + B(m,n) */
    00138       /* Add, saturate and then store the results in the destination buffer. */
    00139       *pOut++ = clip_q63_to_q31(((q63_t) (*pIn1++)) + (*pIn2++));
    00140
    00141       /* Decrement the loop counter */
    00142       blkCnt--;
    00143     }
    00144
    00145 #endif /* #ifndef ARM_MATH_CM0 */
    00146
    00147     /* set status as ARM_MATH_SUCCESS */
    00148     status = ARM_MATH_SUCCESS;
    00149   }
    00150
    00151   /* Return to application */
    00152   return (status);
    00153 }
    00154

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