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  1. /* ----------------------------------------------------------------------
  2.  * Project:      CMSIS DSP Library
  3.  * Title:        arm_mat_trans_q15.c
  4.  * Description:  Q15 matrix transpose
  5.  *
  6.  * $Date:        27. January 2017
  7.  * $Revision:    V.1.5.1
  8.  *
  9.  * Target Processor: Cortex-M cores
  10.  * -------------------------------------------------------------------- */
  11. /*
  12.  * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
  13.  *
  14.  * SPDX-License-Identifier: Apache-2.0
  15.  *
  16.  * Licensed under the Apache License, Version 2.0 (the License); you may
  17.  * not use this file except in compliance with the License.
  18.  * You may obtain a copy of the License at
  19.  *
  20.  * www.apache.org/licenses/LICENSE-2.0
  21.  *
  22.  * Unless required by applicable law or agreed to in writing, software
  23.  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
  24.  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  25.  * See the License for the specific language governing permissions and
  26.  * limitations under the License.
  27.  */
  28.  
  29. #include "arm_math.h"
  30.  
  31. /**
  32.  * @ingroup groupMatrix
  33.  */
  34.  
  35. /**
  36.  * @addtogroup MatrixTrans
  37.  * @{
  38.  */
  39.  
  40. /*
  41.  * @brief Q15 matrix transpose.
  42.  * @param[in]  *pSrc points to the input matrix
  43.  * @param[out] *pDst points to the output matrix
  44.  * @return      The function returns either  <code>ARM_MATH_SIZE_MISMATCH</code>
  45.  * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
  46.  */
  47.  
  48. arm_status arm_mat_trans_q15(
  49.   const arm_matrix_instance_q15 * pSrc,
  50.   arm_matrix_instance_q15 * pDst)
  51. {
  52.   q15_t *pSrcA = pSrc->pData;                    /* input data matrix pointer */
  53.   q15_t *pOut = pDst->pData;                     /* output data matrix pointer */
  54.   uint16_t nRows = pSrc->numRows;                /* number of nRows */
  55.   uint16_t nColumns = pSrc->numCols;             /* number of nColumns */
  56.   uint16_t col, row = nRows, i = 0U;             /* row and column loop counters */
  57.   arm_status status;                             /* status of matrix transpose */
  58.  
  59. #if defined (ARM_MATH_DSP)
  60.  
  61.   /* Run the below code for Cortex-M4 and Cortex-M3 */
  62. #ifndef UNALIGNED_SUPPORT_DISABLE
  63.  
  64.   q31_t in;                                      /* variable to hold temporary output  */
  65.  
  66. #else
  67.  
  68.   q15_t in;
  69.  
  70. #endif  /*      #ifndef UNALIGNED_SUPPORT_DISABLE       */
  71.  
  72. #ifdef ARM_MATH_MATRIX_CHECK
  73.  
  74.  
  75.   /* Check for matrix mismatch condition */
  76.   if ((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
  77.   {
  78.     /* Set status as ARM_MATH_SIZE_MISMATCH */
  79.     status = ARM_MATH_SIZE_MISMATCH;
  80.   }
  81.   else
  82. #endif /*      #ifdef ARM_MATH_MATRIX_CHECK    */
  83.  
  84.   {
  85.     /* Matrix transpose by exchanging the rows with columns */
  86.     /* row loop     */
  87.     do
  88.     {
  89.  
  90.       /* Apply loop unrolling and exchange the columns with row elements */
  91.       col = nColumns >> 2U;
  92.  
  93.       /* The pointer pOut is set to starting address of the column being processed */
  94.       pOut = pDst->pData + i;
  95.  
  96.       /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  97.        ** a second loop below computes the remaining 1 to 3 samples. */
  98.       while (col > 0U)
  99.       {
  100. #ifndef UNALIGNED_SUPPORT_DISABLE
  101.  
  102.         /* Read two elements from the row */
  103.         in = *__SIMD32(pSrcA)++;
  104.  
  105.         /* Unpack and store one element in the destination */
  106. #ifndef ARM_MATH_BIG_ENDIAN
  107.  
  108.         *pOut = (q15_t) in;
  109.  
  110. #else
  111.  
  112.         *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);
  113.  
  114. #endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */
  115.  
  116.         /* Update the pointer pOut to point to the next row of the transposed matrix */
  117.         pOut += nRows;
  118.  
  119.         /* Unpack and store the second element in the destination */
  120.  
  121. #ifndef ARM_MATH_BIG_ENDIAN
  122.  
  123.         *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);
  124.  
  125. #else
  126.  
  127.         *pOut = (q15_t) in;
  128.  
  129. #endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */
  130.  
  131.         /* Update the pointer pOut to point to the next row of the transposed matrix */
  132.         pOut += nRows;
  133.  
  134.         /* Read two elements from the row */
  135. #ifndef ARM_MATH_BIG_ENDIAN
  136.  
  137.         in = *__SIMD32(pSrcA)++;
  138.  
  139. #else
  140.  
  141.         in = *__SIMD32(pSrcA)++;
  142.  
  143. #endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */
  144.  
  145.         /* Unpack and store one element in the destination */
  146. #ifndef ARM_MATH_BIG_ENDIAN
  147.  
  148.         *pOut = (q15_t) in;
  149.  
  150. #else
  151.  
  152.         *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);
  153.  
  154. #endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */
  155.  
  156.         /* Update the pointer pOut to point to the next row of the transposed matrix */
  157.         pOut += nRows;
  158.  
  159.         /* Unpack and store the second element in the destination */
  160. #ifndef ARM_MATH_BIG_ENDIAN
  161.  
  162.         *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16);
  163.  
  164. #else
  165.  
  166.         *pOut = (q15_t) in;
  167.  
  168. #endif /*    #ifndef ARM_MATH_BIG_ENDIAN    */
  169.  
  170. #else
  171.         /* Read one element from the row */
  172.         in = *pSrcA++;
  173.  
  174.         /* Store one element in the destination */
  175.         *pOut = in;
  176.  
  177.         /* Update the pointer px to point to the next row of the transposed matrix */
  178.         pOut += nRows;
  179.  
  180.         /* Read one element from the row */
  181.         in = *pSrcA++;
  182.  
  183.         /* Store one element in the destination */
  184.         *pOut = in;
  185.  
  186.         /* Update the pointer px to point to the next row of the transposed matrix */
  187.         pOut += nRows;
  188.  
  189.         /* Read one element from the row */
  190.         in = *pSrcA++;
  191.  
  192.         /* Store one element in the destination */
  193.         *pOut = in;
  194.  
  195.         /* Update the pointer px to point to the next row of the transposed matrix */
  196.         pOut += nRows;
  197.  
  198.         /* Read one element from the row */
  199.         in = *pSrcA++;
  200.  
  201.         /* Store one element in the destination */
  202.         *pOut = in;
  203.  
  204. #endif  /*      #ifndef UNALIGNED_SUPPORT_DISABLE       */
  205.  
  206.         /* Update the pointer pOut to point to the next row of the transposed matrix */
  207.         pOut += nRows;
  208.  
  209.         /* Decrement the column loop counter */
  210.         col--;
  211.       }
  212.  
  213.       /* Perform matrix transpose for last 3 samples here. */
  214.       col = nColumns % 0x4U;
  215.  
  216. #else
  217.  
  218.   /* Run the below code for Cortex-M0 */
  219.  
  220. #ifdef ARM_MATH_MATRIX_CHECK
  221.  
  222.   /* Check for matrix mismatch condition */
  223.   if ((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
  224.   {
  225.     /* Set status as ARM_MATH_SIZE_MISMATCH */
  226.     status = ARM_MATH_SIZE_MISMATCH;
  227.   }
  228.   else
  229. #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
  230.  
  231.   {
  232.     /* Matrix transpose by exchanging the rows with columns */
  233.     /* row loop     */
  234.     do
  235.     {
  236.       /* The pointer pOut is set to starting address of the column being processed */
  237.       pOut = pDst->pData + i;
  238.  
  239.       /* Initialize column loop counter */
  240.       col = nColumns;
  241.  
  242. #endif /* #if defined (ARM_MATH_DSP) */
  243.  
  244.       while (col > 0U)
  245.       {
  246.         /* Read and store the input element in the destination */
  247.         *pOut = *pSrcA++;
  248.  
  249.         /* Update the pointer pOut to point to the next row of the transposed matrix */
  250.         pOut += nRows;
  251.  
  252.         /* Decrement the column loop counter */
  253.         col--;
  254.       }
  255.  
  256.       i++;
  257.  
  258.       /* Decrement the row loop counter */
  259.       row--;
  260.  
  261.     } while (row > 0U);
  262.  
  263.     /* set status as ARM_MATH_SUCCESS */
  264.     status = ARM_MATH_SUCCESS;
  265.   }
  266.   /* Return to application */
  267.   return (status);
  268. }
  269.  
  270. /**
  271.  * @} end of MatrixTrans group
  272.  */
  273.