arm_mat_trans_q15.c

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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;
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.  
* -------------------------------------------------------------------- */

#include "arm_math.h"

/*    
 * @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);
}