The CMSIS DSP 5 library
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functions/MatrixFunctions/arm_mat_trans_f32.c
- Committer:
- xorjoep
- Date:
- 2018-06-21
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
File content as of revision 3:4098b9d3d571:
/* ---------------------------------------------------------------------- * 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 */