text: /* ----------------------------------------------------------------------    
  * Copyright (C) 2010-2013 ARM Limited. All rights reserved.    
  *    
  * $Date:        17. January 2013 
  * $Revision: 	V1.4.1
  *    
  * Project: 	    CMSIS DSP Library    
  * Title:	    arm_mat_trans_f32.c    
  *    
  * Description:	Floating-point matrix transpose.    
  *    
  * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
  *  
  * Redistribution and use in source and binary forms, with or without 
  * modification, are permitted provided that the following conditions
  * are met:
  *   - Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *   - Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in
  *     the documentation and/or other materials provided with the 
  *     distribution.
  *   - Neither the name of ARM LIMITED nor the names of its contributors
  *     may be used to endorse or promote products derived from this
  *     software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.    
  * -------------------------------------------------------------------- */
  
  /**    
   * @defgroup MatrixTrans Matrix Transpose    
   *    
   * Tranposes a matrix.    
   * Transposing an <code>M x N</code> matrix flips it around the center diagonal and results in an <code>N x M</code> matrix.    
   * \image html MatrixTranspose.gif "Transpose of a 3 x 3 matrix"    
   */
  
  #include "arm_math.h"
  
  /**    
   * @ingroup groupMatrix    
   */
  
  /**    
   * @addtogroup MatrixTrans    
   * @{    
   */
  
  /**    
    * @brief Floating-point matrix transpose.    
    * @param[in]  *pSrc points to the input matrix    
    * @param[out] *pDst points to the output matrix    
    * @return 	The function returns either  <code>ARM_MATH_SIZE_MISMATCH</code>    
    * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.    
    */
  
  
  arm_status arm_mat_trans_f32(
    const arm_matrix_instance_f32 * pSrc,
    arm_matrix_instance_f32 * pDst)
  {
    float32_t *pIn = pSrc->pData;                  /* input data matrix pointer */
    float32_t *pOut = pDst->pData;                 /* output data matrix pointer */
    float32_t *px;                                 /* Temporary output data matrix pointer */
    uint16_t nRows = pSrc->numRows;                /* number of rows */
    uint16_t nColumns = pSrc->numCols;             /* number of columns */
  
  #ifndef ARM_MATH_CM0_FAMILY
  
    /* Run the below code for Cortex-M4 and Cortex-M3 */
  
    uint16_t blkCnt, i = 0u, row = nRows;          /* loop counters */
    arm_status status;                             /* status of matrix transpose  */
  
  
  #ifdef ARM_MATH_MATRIX_CHECK
  
  
    /* Check for matrix mismatch condition */
    if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
    {
      /* Set status as ARM_MATH_SIZE_MISMATCH */
      status = ARM_MATH_SIZE_MISMATCH;
    }
    else
  #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
  
    {
      /* Matrix transpose by exchanging the rows with columns */
      /* row loop     */
      do
      {
        /* Loop Unrolling */
        blkCnt = nColumns >> 2;
  
        /* The pointer px is set to starting address of the column being processed */
        px = pOut + i;
  
        /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
         ** a second loop below computes the remaining 1 to 3 samples. */
        while(blkCnt > 0u)        /* column loop */
        {
          /* Read and store the input element in the destination */
          *px = *pIn++;
  
          /* Update the pointer px to point to the next row of the transposed matrix */
          px += nRows;
  
          /* Read and store the input element in the destination */
          *px = *pIn++;
  
          /* Update the pointer px to point to the next row of the transposed matrix */
          px += nRows;
  
          /* Read and store the input element in the destination */
          *px = *pIn++;
  
          /* Update the pointer px to point to the next row of the transposed matrix */
          px += nRows;
  
          /* Read and store the input element in the destination */
          *px = *pIn++;
  
          /* Update the pointer px to point to the next row of the transposed matrix */
          px += nRows;
  
          /* Decrement the column loop counter */
          blkCnt--;
        }
  
        /* Perform matrix transpose for last 3 samples here. */
        blkCnt = nColumns % 0x4u;
  
        while(blkCnt > 0u)
        {
          /* Read and store the input element in the destination */
          *px = *pIn++;
  
          /* Update the pointer px to point to the next row of the transposed matrix */
          px += nRows;
  
          /* Decrement the column loop counter */
          blkCnt--;
        }
  
  #else
  
    /* Run the below code for Cortex-M0 */
  
    uint16_t col, i = 0u, row = nRows;             /* loop counters */
    arm_status status;                             /* status of matrix transpose  */
  
  
  #ifdef ARM_MATH_MATRIX_CHECK
  
    /* Check for matrix mismatch condition */
    if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
    {
      /* Set status as ARM_MATH_SIZE_MISMATCH */
      status = ARM_MATH_SIZE_MISMATCH;
    }
    else
  #endif /*      #ifdef ARM_MATH_MATRIX_CHECK    */
  
    {
      /* Matrix transpose by exchanging the rows with columns */
      /* row loop     */
      do
      {
        /* The pointer px is set to starting address of the column being processed */
        px = pOut + i;
  
        /* Initialize column loop counter */
        col = nColumns;
  
        while(col > 0u)
        {
          /* Read and store the input element in the destination */
          *px = *pIn++;
  
          /* Update the pointer px to point to the next row of the transposed matrix */
          px += nRows;
  
          /* Decrement the column loop counter */
          col--;
        }
  
  #endif /* #ifndef ARM_MATH_CM0_FAMILY */
  
        i++;
  
        /* Decrement the row loop counter */
        row--;
  
      } while(row > 0u);          /* row loop end  */
  
      /* Set status as ARM_MATH_SUCCESS */
      status = ARM_MATH_SUCCESS;
    }
  
    /* Return to application */
    return (status);
  }
  
  /**    
   * @} end of MatrixTrans group    
   */
  