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/* ----------------------------------------------------------------------
* 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 "arm_math.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
*/
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