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# arm_mat_trans_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_trans_q31.c
    00009 *
    00010 * Description:  Q31 matrix transpose.
    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
    00047 /*
    00048   * @brief Q31 matrix transpose.
    00049   * @param[in]  *pSrc points to the input matrix
    00050   * @param[out] *pDst points to the output matrix
    00051   * @return     The function returns either  <code>ARM_MATH_SIZE_MISMATCH</code>
    00052   * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
    00053  */
    00054
    00055 arm_status arm_mat_trans_q31(
    00056   const arm_matrix_instance_q31 * pSrc,
    00057   arm_matrix_instance_q31 * pDst)
    00058 {
    00059   q31_t *pIn = pSrc->pData;                      /* input data matrix pointer  */
    00060   q31_t *pOut = pDst->pData;                     /* output data matrix pointer  */
    00061   q31_t *px;                                     /* Temporary output data matrix pointer */
    00062   uint16_t nRows = pSrc->numRows;                /* number of nRows */
    00063   uint16_t nColumns = pSrc->numCols;             /* number of nColumns  */
    00064
    00065 #ifndef ARM_MATH_CM0
    00066
    00067   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00068
    00069   uint16_t blkCnt, i = 0u, row = nRows;          /* loop counters */
    00070   arm_status status;                             /* status of matrix transpose */
    00071
    00072
    00073 #ifdef ARM_MATH_MATRIX_CHECK
    00074
    00075
    00076   /* Check for matrix mismatch condition */
    00077   if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
    00078   {
    00079     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00080     status = ARM_MATH_SIZE_MISMATCH;
    00081   }
    00082   else
    00083 #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
    00084
    00085   {
    00086     /* Matrix transpose by exchanging the rows with columns */
    00087     /* row loop     */
    00088     do
    00089     {
    00090       /* Apply loop unrolling and exchange the columns with row elements */
    00091       blkCnt = nColumns >> 2u;
    00092
    00093       /* The pointer px is set to starting address of the column being processed */
    00094       px = pOut + i;
    00095
    00096       /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00097        ** a second loop below computes the remaining 1 to 3 samples. */
    00098       while(blkCnt > 0u)
    00099       {
    00100         /* Read and store the input element in the destination */
    00101         *px = *pIn++;
    00102
    00103         /* Update the pointer px to point to the next row of the transposed matrix */
    00104         px += nRows;
    00105
    00106         /* Read and store the input element in the destination */
    00107         *px = *pIn++;
    00108
    00109         /* Update the pointer px to point to the next row of the transposed matrix */
    00110         px += nRows;
    00111
    00112         /* Read and store the input element in the destination */
    00113         *px = *pIn++;
    00114
    00115         /* Update the pointer px to point to the next row of the transposed matrix */
    00116         px += nRows;
    00117
    00118         /* Read and store the input element in the destination */
    00119         *px = *pIn++;
    00120
    00121         /* Update the pointer px to point to the next row of the transposed matrix */
    00122         px += nRows;
    00123
    00124         /* Decrement the column loop counter */
    00125         blkCnt--;
    00126       }
    00127
    00128       /* Perform matrix transpose for last 3 samples here. */
    00129       blkCnt = nColumns % 0x4u;
    00130
    00131       while(blkCnt > 0u)
    00132       {
    00133         /* Read and store the input element in the destination */
    00134         *px = *pIn++;
    00135
    00136         /* Update the pointer px to point to the next row of the transposed matrix */
    00137         px += nRows;
    00138
    00139         /* Decrement the column loop counter */
    00140         blkCnt--;
    00141       }
    00142
    00143 #else
    00144
    00145   /* Run the below code for Cortex-M0 */
    00146
    00147   uint16_t col, i = 0u, row = nRows;             /* loop counters */
    00148   arm_status status;                             /* status of matrix transpose */
    00149
    00150
    00151 #ifdef ARM_MATH_MATRIX_CHECK
    00152
    00153   /* Check for matrix mismatch condition */
    00154   if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
    00155   {
    00156     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00157     status = ARM_MATH_SIZE_MISMATCH;
    00158   }
    00159   else
    00160 #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
    00161
    00162   {
    00163     /* Matrix transpose by exchanging the rows with columns */
    00164     /* row loop     */
    00165     do
    00166     {
    00167       /* The pointer px is set to starting address of the column being processed */
    00168       px = pOut + i;
    00169
    00170       /* Initialize column loop counter */
    00171       col = nColumns;
    00172
    00173       while(col > 0u)
    00174       {
    00175         /* Read and store the input element in the destination */
    00176         *px = *pIn++;
    00177
    00178         /* Update the pointer px to point to the next row of the transposed matrix */
    00179         px += nRows;
    00180
    00181         /* Decrement the column loop counter */
    00182         col--;
    00183       }
    00184
    00185 #endif /* #ifndef ARM_MATH_CM0 */
    00186
    00187       i++;
    00188
    00189       /* Decrement the row loop counter */
    00190       row--;
    00191
    00192     }
    00193     while(row > 0u);            /* row loop end */
    00194
    00195     /* set status as ARM_MATH_SUCCESS */
    00196     status = ARM_MATH_SUCCESS;
    00197   }
    00198
    00199   /* Return to application */
    00200   return (status);
    00201 }
    00202

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