arm_mat_trans_q31.c

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_mat_trans_q31.c  
00009 *  
00010 * Description:  Q31 matrix transpose.  
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 * Version 0.0.5  2010/04/26   
00027 *    incorporated review comments and updated with latest CMSIS layer  
00028 *  
00029 * Version 0.0.3  2010/03/10   
00030 *    Initial version  
00031 * -------------------------------------------------------------------- */ 
00032  
00033 #include "arm_math.h" 
00034  
00035 /**  
00036  * @ingroup groupMatrix  
00037  */ 
00038  
00039 /**  
00040  * @addtogroup MatrixTrans  
00041  * @{  
00042  */ 
00043  
00044 /*  
00045   * @brief Q31 matrix transpose.  
00046   * @param[in]  *pSrc points to the input matrix  
00047   * @param[out] *pDst points to the output matrix  
00048   * @return     The function returns either  <code>ARM_MATH_SIZE_MISMATCH</code>  
00049   * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.  
00050  */ 
00051  
00052 arm_status arm_mat_trans_q31( 
00053   const arm_matrix_instance_q31 * pSrc, 
00054   arm_matrix_instance_q31 * pDst) 
00055 { 
00056   q31_t *pIn = pSrc->pData;                      /* input data matrix pointer  */ 
00057   q31_t *pOut = pDst->pData;                     /* output data matrix pointer  */ 
00058   q31_t *px;                                     /* Temporary output data matrix pointer */ 
00059   uint16_t nRows = pSrc->numRows;                /* number of nRows */ 
00060   uint16_t nColumns = pSrc->numCols;             /* number of nColumns  */ 
00061   uint16_t blkCnt, i = 0u, row = nRows;          /* loop counters */ 
00062   arm_status status;                             /* status of matrix transpose */ 
00063  
00064  
00065 #ifdef ARM_MATH_MATRIX_CHECK 
00066   /* Check for matrix mismatch condition */ 
00067   if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows)) 
00068   { 
00069     /* Set status as ARM_MATH_SIZE_MISMATCH */ 
00070     status = ARM_MATH_SIZE_MISMATCH; 
00071   } 
00072   else 
00073 #endif 
00074   { 
00075     /* Matrix transpose by exchanging the rows with columns */ 
00076     /* row loop     */ 
00077     do 
00078     { 
00079       /* Apply loop unrolling and exchange the columns with row elements */ 
00080       blkCnt = nColumns >> 2u; 
00081  
00082       /* The pointer px is set to starting address of the column being processed */ 
00083       px = pOut + i; 
00084  
00085       /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.  
00086        ** a second loop below computes the remaining 1 to 3 samples. */ 
00087       while(blkCnt > 0u) 
00088       { 
00089         /* Read and store the input element in the destination */ 
00090         *px = *pIn++; 
00091  
00092         /* Update the pointer px to point to the next row of the transposed matrix */ 
00093         px += nRows; 
00094  
00095         /* Read and store the input element in the destination */ 
00096         *px = *pIn++; 
00097  
00098         /* Update the pointer px to point to the next row of the transposed matrix */ 
00099         px += nRows; 
00100  
00101         /* Read and store the input element in the destination */ 
00102         *px = *pIn++; 
00103  
00104         /* Update the pointer px to point to the next row of the transposed matrix */ 
00105         px += nRows; 
00106  
00107         /* Read and store the input element in the destination */ 
00108         *px = *pIn++; 
00109  
00110         /* Update the pointer px to point to the next row of the transposed matrix */ 
00111         px += nRows; 
00112  
00113         /* Decrement the column loop counter */ 
00114         blkCnt--; 
00115       } 
00116  
00117       /* Perform matrix transpose for last 3 samples here. */ 
00118       blkCnt = nColumns % 0x4u; 
00119  
00120       while(blkCnt > 0u) 
00121       { 
00122         /* Read and store the input element in the destination */ 
00123         *px = *pIn++; 
00124  
00125         /* Update the pointer px to point to the next row of the transposed matrix */ 
00126         px += nRows; 
00127  
00128         /* Decrement the column loop counter */ 
00129         blkCnt--; 
00130       } 
00131  
00132       i++; 
00133  
00134       /* Decrement the row loop counter */ 
00135       row--; 
00136  
00137     } 
00138     while(row > 0u);            /* row loop end */ 
00139  
00140     /* set status as ARM_MATH_SUCCESS */ 
00141     status = ARM_MATH_SUCCESS; 
00142   } 
00143  
00144   /* Return to application */ 
00145   return (status); 
00146 } 
00147  
00148 /**  
00149  * @} end of MatrixTrans group  
00150  */