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156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mat_trans_f64.c
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* Description: Floating-point matrix transpose
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 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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#include "dsp/matrix_functions.h"
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/**
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@ingroup groupMatrix
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*/
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/**
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@defgroup MatrixTrans Matrix Transpose
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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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/**
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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 input matrix
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@param[out] pDst points to output matrix
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_SIZE_MISMATCH : Matrix size check failed
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*/
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arm_status arm_mat_trans_f64(
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const arm_matrix_instance_f64 * pSrc,
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arm_matrix_instance_f64 * pDst)
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{
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float64_t *pIn = pSrc->pData; /* input data matrix pointer */
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float64_t *pOut = pDst->pData; /* output data matrix pointer */
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float64_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 nCols = pSrc->numCols; /* number of columns */
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uint64_t col, row = nRows, i = 0U; /* 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) ||
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(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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/* Pointer px is set to starting address of column being processed */
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px = pOut + i;
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#if defined (ARM_MATH_LOOPUNROLL)
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/* Loop unrolling: Compute 4 outputs at a time */
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col = nCols >> 2U;
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while (col > 0U) /* column loop */
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{
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/* Read and store input element in destination */
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*px = *pIn++;
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/* Update pointer px to point to next row of transposed matrix */
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px += nRows;
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*px = *pIn++;
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px += nRows;
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*px = *pIn++;
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px += nRows;
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*px = *pIn++;
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px += nRows;
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/* Decrement column loop counter */
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col--;
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}
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/* Loop unrolling: Compute remaining outputs */
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col = nCols % 0x4U;
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#else
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/* Initialize col with number of samples */
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col = nCols;
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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while (col > 0U)
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{
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/* Read and store input element in destination */
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*px = *pIn++;
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/* Update pointer px to point to next row of transposed matrix */
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px += nRows;
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/* Decrement column loop counter */
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col--;
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}
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i++;
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/* Decrement 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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