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/* ----------------------------------------------------------------------    
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* Copyright (C) 2010-2014 ARM Limited. All rights reserved.    
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*    
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* $Date:        19. March 2015
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* $Revision:    V.1.4.5
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*    
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* Project:          CMSIS DSP Library    
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* Title:            arm_mat_trans_f32.c    
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*    
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* Description:  Floating-point matrix transpose.    
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*    
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*  
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*   - Redistributions of source code must retain the above copyright
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*     notice, this list of conditions and the following disclaimer.
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*   - Redistributions in binary form must reproduce the above copyright
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*     notice, this list of conditions and the following disclaimer in
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*     the documentation and/or other materials provided with the
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*     distribution.
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*   - Neither the name of ARM LIMITED nor the names of its contributors
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*     may be used to endorse or promote products derived from this
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*     software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.    
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* -------------------------------------------------------------------- */
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/**    
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 * @defgroup MatrixTrans Matrix Transpose    
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 *    
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 * Tranposes a matrix.    
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 * Transposing an <code>M x N</code> matrix flips it around the center diagonal and results in an <code>N x M</code> matrix.    
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 * \image html MatrixTranspose.gif "Transpose of a 3 x 3 matrix"    
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 */
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#include "arm_math.h"
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/**    
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 * @ingroup groupMatrix    
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 */
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/**    
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 * @addtogroup MatrixTrans    
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 * @{    
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 */
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/**    
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  * @brief Floating-point matrix transpose.    
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  * @param[in]  *pSrc points to the input matrix    
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  * @param[out] *pDst points to the output matrix    
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  * @return     The function returns either  <code>ARM_MATH_SIZE_MISMATCH</code>    
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  * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.    
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  */
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arm_status arm_mat_trans_f32(
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  const arm_matrix_instance_f32 * pSrc,
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  arm_matrix_instance_f32 * pDst)
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{
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  float32_t *pIn = pSrc->pData;                  /* input data matrix pointer */
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  float32_t *pOut = pDst->pData;                 /* output data matrix pointer */
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  float32_t *px;                                 /* Temporary output data matrix pointer */
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  uint16_t nRows = pSrc->numRows;                /* number of rows */
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  uint16_t nColumns = pSrc->numCols;             /* number of columns */
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#ifndef ARM_MATH_CM0_FAMILY
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  /* Run the below code for Cortex-M4 and Cortex-M3 */
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  uint16_t blkCnt, i = 0u, row = nRows;          /* loop counters */
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  arm_status status;                             /* status of matrix transpose  */
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#ifdef ARM_MATH_MATRIX_CHECK
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  /* Check for matrix mismatch condition */
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  if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
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  {
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    /* Set status as ARM_MATH_SIZE_MISMATCH */
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    status = ARM_MATH_SIZE_MISMATCH;
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  }
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  else
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#endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
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  {
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    /* Matrix transpose by exchanging the rows with columns */
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    /* row loop     */
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    do
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    {
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      /* Loop Unrolling */
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      blkCnt = nColumns >> 2;
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      /* The pointer px is set to starting address of the column being processed */
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      px = pOut + i;
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      /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
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       ** a second loop below computes the remaining 1 to 3 samples. */
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      while(blkCnt > 0u)        /* column loop */
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      {
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        /* Read and store the input element in the destination */
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        *px = *pIn++;
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        /* Update the pointer px to point to the next row of the transposed matrix */
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        px += nRows;
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        /* Read and store the input element in the destination */
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        *px = *pIn++;
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        /* Update the pointer px to point to the next row of the transposed matrix */
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        px += nRows;
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        /* Read and store the input element in the destination */
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        *px = *pIn++;
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        /* Update the pointer px to point to the next row of the transposed matrix */
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        px += nRows;
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        /* Read and store the input element in the destination */
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        *px = *pIn++;
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        /* Update the pointer px to point to the next row of the transposed matrix */
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        px += nRows;
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        /* Decrement the column loop counter */
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        blkCnt--;
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      }
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      /* Perform matrix transpose for last 3 samples here. */
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      blkCnt = nColumns % 0x4u;
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      while(blkCnt > 0u)
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      {
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        /* Read and store the input element in the destination */
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        *px = *pIn++;
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        /* Update the pointer px to point to the next row of the transposed matrix */
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        px += nRows;
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        /* Decrement the column loop counter */
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        blkCnt--;
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      }
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#else
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  /* Run the below code for Cortex-M0 */
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  uint16_t col, i = 0u, row = nRows;             /* loop counters */
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  arm_status status;                             /* status of matrix transpose  */
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#ifdef ARM_MATH_MATRIX_CHECK
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  /* Check for matrix mismatch condition */
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  if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
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  {
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    /* Set status as ARM_MATH_SIZE_MISMATCH */
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    status = ARM_MATH_SIZE_MISMATCH;
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  }
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  else
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#endif /*      #ifdef ARM_MATH_MATRIX_CHECK    */
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  {
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    /* Matrix transpose by exchanging the rows with columns */
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    /* row loop     */
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    do
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    {
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      /* The pointer px is set to starting address of the column being processed */
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      px = pOut + i;
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      /* Initialize column loop counter */
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      col = nColumns;
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      while(col > 0u)
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      {
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        /* Read and store the input element in the destination */
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        *px = *pIn++;
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        /* Update the pointer px to point to the next row of the transposed matrix */
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        px += nRows;
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        /* Decrement the column loop counter */
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        col--;
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      }
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#endif /* #ifndef ARM_MATH_CM0_FAMILY */
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      i++;
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      /* Decrement the row loop counter */
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      row--;
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    } while(row > 0u);          /* row loop end  */
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    /* Set status as ARM_MATH_SUCCESS */
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    status = ARM_MATH_SUCCESS;
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  }
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  /* Return to application */
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  return (status);
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}
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/**    
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 * @} end of MatrixTrans group    
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 */