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/* ----------------------------------------------------------------------    

* Copyright (C) 2010-2014 ARM Limited. All rights reserved.    

*    

* $Date:        19. March 2015

* $Revision:    V.1.4.5

*    

* Project:          CMSIS DSP Library    

* Title:            arm_mat_trans_q15.c    

*    

* Description:  Q15 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.  

* -------------------------------------------------------------------- */

#include "arm_math.h"

/**    

 * @ingroup groupMatrix    

 */

/**    

 * @addtogroup MatrixTrans    

 * @{    

 */

/*    

 * @brief Q15 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_q15(

  const arm_matrix_instance_q15 * pSrc,

  arm_matrix_instance_q15 * pDst)

{

  q15_t *pSrcA = pSrc->pData;                    /* input data matrix pointer */

  q15_t *pOut = pDst->pData;                     /* output data matrix pointer */

  uint16_t nRows = pSrc->numRows;                /* number of nRows */

  uint16_t nColumns = pSrc->numCols;             /* number of nColumns */

  uint16_t col, row = nRows, i = 0u;             /* row and column loop counters */

  arm_status status;                             /* status of matrix transpose */

#ifndef ARM_MATH_CM0_FAMILY

  /* Run the below code for Cortex-M4 and Cortex-M3 */

#ifndef UNALIGNED_SUPPORT_DISABLE

  q31_t in;                                      /* variable to hold temporary output  */

#else

  q15_t in;

#endif  /*      #ifndef UNALIGNED_SUPPORT_DISABLE       */

#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

    {

      /* Apply loop unrolling and exchange the columns with row elements */

      col = nColumns >> 2u;

      /* The pointer pOut is set to starting address of the column being processed */

      pOut = pDst->pData + 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(col > 0u)

      {

#ifndef UNALIGNED_SUPPORT_DISABLE

        /* Read two elements from the row */

        in = *__SIMD32(pSrcA)++;

        /* Unpack and store one element in the destination */

#ifndef ARM_MATH_BIG_ENDIAN

        *pOut = (q15_t) in;

#else

        *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);

#endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */

        /* Update the pointer pOut to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Unpack and store the second element in the destination */

#ifndef ARM_MATH_BIG_ENDIAN

        *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);

#else

        *pOut = (q15_t) in;

#endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */

        /* Update the pointer pOut to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Read two elements from the row */

#ifndef ARM_MATH_BIG_ENDIAN

        in = *__SIMD32(pSrcA)++;

#else

        in = *__SIMD32(pSrcA)++;

#endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */

        /* Unpack and store one element in the destination */

#ifndef ARM_MATH_BIG_ENDIAN

        *pOut = (q15_t) in;

#else

        *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);

#endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */

        /* Update the pointer pOut to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Unpack and store the second element in the destination */

#ifndef ARM_MATH_BIG_ENDIAN

        *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);

#else

        *pOut = (q15_t) in;

#endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */

#else    

        /* Read one element from the row */

        in = *pSrcA++;

        /* Store one element in the destination */

        *pOut = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Read one element from the row */

        in = *pSrcA++;

        /* Store one element in the destination */

        *pOut = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Read one element from the row */

        in = *pSrcA++;

        /* Store one element in the destination */

        *pOut = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Read one element from the row */

        in = *pSrcA++;

        /* Store one element in the destination */

        *pOut = in;

#endif  /*      #ifndef UNALIGNED_SUPPORT_DISABLE       */

        /* Update the pointer pOut to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Decrement the column loop counter */

        col--;

      }

      /* Perform matrix transpose for last 3 samples here. */

      col = nColumns % 0x4u;

#else

  /* Run the below code for Cortex-M0 */

#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 pOut is set to starting address of the column being processed */

      pOut = pDst->pData + i;

      /* Initialize column loop counter */

      col = nColumns;

#endif /* #ifndef ARM_MATH_CM0_FAMILY */

      while(col > 0u)

      {

        /* Read and store the input element in the destination */

        *pOut = *pSrcA++;

        /* Update the pointer pOut to point to the next row of the transposed matrix */

        pOut += nRows;

        /* Decrement the column loop counter */

        col--;

      }

      i++;

      /* Decrement the row loop counter */

      row--;

    } while(row > 0u);

    /* set status as ARM_MATH_SUCCESS */

    status = ARM_MATH_SUCCESS;

  }

  /* Return to application */

  return (status);

}

/**    

 * @} end of MatrixTrans group    

 */