text: /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_mat_trans_f32.c
   * Description:  Floating-point matrix transpose
   *
   * $Date:        27. January 2017
   * $Revision:    V.1.5.1
   *
   * Target Processor: Cortex-M cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * Licensed under the Apache License, Version 2.0 (the License); you may
   * not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /**
   * @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 "CMSIS_DSP/cmsis_dsp.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 */
  
  #if defined (ARM_MATH_DSP)
  
    /* 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 /* #if defined (ARM_MATH_DSP) */
  
        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
   */
  