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Julien Chevalley
206
Drivers/CMSIS/DSP/Source/MatrixFunctions/arm_mat_trans_f32.c
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206
Drivers/CMSIS/DSP/Source/MatrixFunctions/arm_mat_trans_f32.c
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mat_trans_f32.c
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* Description: Floating-point matrix transpose
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*
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* $Date: 27. January 2017
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* $Revision: V.1.5.1
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*
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* Target Processor: Cortex-M cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @defgroup MatrixTrans Matrix Transpose
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*
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* Tranposes a matrix.
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* Transposing an <code>M x N</code> matrix flips it around the center diagonal and results in an <code>N x M</code> matrix.
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* \image html MatrixTranspose.gif "Transpose of a 3 x 3 matrix"
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*/
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#include "arm_math.h"
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/**
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* @ingroup groupMatrix
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*/
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/**
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* @addtogroup MatrixTrans
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* @{
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*/
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/**
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* @brief Floating-point matrix transpose.
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* @param[in] *pSrc points to the input matrix
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* @param[out] *pDst points to the output matrix
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* @return The function returns either <code>ARM_MATH_SIZE_MISMATCH</code>
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* or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
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*/
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arm_status arm_mat_trans_f32(
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const arm_matrix_instance_f32 * pSrc,
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arm_matrix_instance_f32 * pDst)
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{
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float32_t *pIn = pSrc->pData; /* input data matrix pointer */
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float32_t *pOut = pDst->pData; /* output data matrix pointer */
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float32_t *px; /* Temporary output data matrix pointer */
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uint16_t nRows = pSrc->numRows; /* number of rows */
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uint16_t nColumns = pSrc->numCols; /* number of columns */
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#if defined (ARM_MATH_DSP)
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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uint16_t blkCnt, i = 0U, row = nRows; /* loop counters */
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arm_status status; /* status of matrix transpose */
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#ifdef ARM_MATH_MATRIX_CHECK
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/* Check for matrix mismatch condition */
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if ((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
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{
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/* Set status as ARM_MATH_SIZE_MISMATCH */
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status = ARM_MATH_SIZE_MISMATCH;
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}
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else
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#endif /* #ifdef ARM_MATH_MATRIX_CHECK */
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{
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/* Matrix transpose by exchanging the rows with columns */
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/* row loop */
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do
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{
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/* Loop Unrolling */
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blkCnt = nColumns >> 2;
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/* The pointer px is set to starting address of the column being processed */
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px = pOut + i;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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while (blkCnt > 0U) /* column loop */
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{
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/* Read and store the input element in the destination */
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*px = *pIn++;
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/* Update the pointer px to point to the next row of the transposed matrix */
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px += nRows;
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/* Read and store the input element in the destination */
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*px = *pIn++;
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/* Update the pointer px to point to the next row of the transposed matrix */
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px += nRows;
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/* Read and store the input element in the destination */
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*px = *pIn++;
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/* Update the pointer px to point to the next row of the transposed matrix */
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px += nRows;
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/* Read and store the input element in the destination */
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*px = *pIn++;
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/* Update the pointer px to point to the next row of the transposed matrix */
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px += nRows;
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/* Decrement the column loop counter */
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blkCnt--;
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}
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/* Perform matrix transpose for last 3 samples here. */
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blkCnt = nColumns % 0x4U;
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while (blkCnt > 0U)
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{
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/* Read and store the input element in the destination */
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*px = *pIn++;
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/* Update the pointer px to point to the next row of the transposed matrix */
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px += nRows;
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/* Decrement the column loop counter */
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blkCnt--;
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}
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#else
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/* Run the below code for Cortex-M0 */
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uint16_t col, i = 0U, row = nRows; /* loop counters */
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arm_status status; /* status of matrix transpose */
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#ifdef ARM_MATH_MATRIX_CHECK
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/* Check for matrix mismatch condition */
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if ((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows))
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{
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/* Set status as ARM_MATH_SIZE_MISMATCH */
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status = ARM_MATH_SIZE_MISMATCH;
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}
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else
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#endif /* #ifdef ARM_MATH_MATRIX_CHECK */
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{
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/* Matrix transpose by exchanging the rows with columns */
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/* row loop */
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do
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{
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/* The pointer px is set to starting address of the column being processed */
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px = pOut + i;
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/* Initialize column loop counter */
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col = nColumns;
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while (col > 0U)
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{
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/* Read and store the input element in the destination */
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*px = *pIn++;
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/* Update the pointer px to point to the next row of the transposed matrix */
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px += nRows;
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/* Decrement the column loop counter */
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col--;
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}
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#endif /* #if defined (ARM_MATH_DSP) */
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i++;
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/* Decrement the row loop counter */
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row--;
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} while (row > 0U); /* row loop end */
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/* Set status as ARM_MATH_SUCCESS */
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status = ARM_MATH_SUCCESS;
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}
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/* Return to application */
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return (status);
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}
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/**
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* @} end of MatrixTrans group
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*/
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