/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_mat_trans_f32.c
* Description: Floating-point matrix transpose
*
* $Date: 18. March 2019
* $Revision: V1.6.0
*
* 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.
*/
#include "arm_math.h"
/**
@ingroup groupMatrix
*/
/**
@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"
*/
/**
@addtogroup MatrixTrans
@{
*/
/**
@brief Floating-point matrix transpose.
@param[in] pSrc points to input matrix
@param[out] pDst points to output matrix
@return execution status
- \ref ARM_MATH_SUCCESS : Operation successful
- \ref ARM_MATH_SIZE_MISMATCH : Matrix size check failed
*/
#if defined(ARM_MATH_NEON)
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 */
uint16_t blkCnt, rowCnt, 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 */
rowCnt = row >> 2;
while (rowCnt > 0U)
{
float32x4_t row0V,row1V,row2V,row3V;
float32x4x2_t ra0,ra1,rb0,rb1;
blkCnt = nColumns >> 2;
/* The pointer px is set to starting address of the column being processed */
px = pOut + i;
/* Compute 4 outputs at a time.
** a second loop below computes the remaining 1 to 3 samples. */
while (blkCnt > 0U) /* Column loop */
{
row0V = vld1q_f32(pIn);
row1V = vld1q_f32(pIn + 1 * nColumns);
row2V = vld1q_f32(pIn + 2 * nColumns);
row3V = vld1q_f32(pIn + 3 * nColumns);
pIn += 4;
ra0 = vzipq_f32(row0V,row2V);
ra1 = vzipq_f32(row1V,row3V);
rb0 = vzipq_f32(ra0.val[0],ra1.val[0]);
rb1 = vzipq_f32(ra0.val[1],ra1.val[1]);
vst1q_f32(px,rb0.val[0]);
px += nRows;
vst1q_f32(px,rb0.val[1]);
px += nRows;
vst1q_f32(px,rb1.val[0]);
px += nRows;
vst1q_f32(px,rb1.val[1]);
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;
*px++ = *(pIn + 1 * nColumns);
*px++ = *(pIn + 2 * nColumns);
*px++ = *(pIn + 3 * nColumns);
px += (nRows - 4);
pIn++;
/* Decrement the column loop counter */
blkCnt--;
}
i += 4;
pIn += 3 * nColumns;
/* Decrement the row loop counter */
rowCnt--;
} /* Row loop end */
rowCnt = row & 3;
while (rowCnt > 0U)
{
blkCnt = nColumns ;
/* The pointer px is set to starting address of the column being processed */
px = pOut + i;
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--;
}
i++;
rowCnt -- ;
}
/* Set status as ARM_MATH_SUCCESS */
status = ARM_MATH_SUCCESS;
}
/* Return to application */
return (status);
}
#else
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 nCols = pSrc->numCols; /* number of columns */
uint32_t col, row = nRows, i = 0U; /* 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
{
/* Pointer px is set to starting address of column being processed */
px = pOut + i;
#if defined (ARM_MATH_LOOPUNROLL)
/* Loop unrolling: Compute 4 outputs at a time */
col = nCols >> 2U;
while (col > 0U) /* column loop */
{
/* Read and store input element in destination */
*px = *pIn++;
/* Update pointer px to point to next row of transposed matrix */
px += nRows;
*px = *pIn++;
px += nRows;
*px = *pIn++;
px += nRows;
*px = *pIn++;
px += nRows;
/* Decrement column loop counter */
col--;
}
/* Loop unrolling: Compute remaining outputs */
col = nCols % 0x4U;
#else
/* Initialize col with number of samples */
col = nCols;
#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
while (col > 0U)
{
/* Read and store input element in destination */
*px = *pIn++;
/* Update pointer px to point to next row of transposed matrix */
px += nRows;
/* Decrement column loop counter */
col--;
}
i++;
/* Decrement 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);
}
#endif /* #if defined(ARM_MATH_NEON) */
/**
* @} end of MatrixTrans group
*/
