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/* ----------------------------------------------------------------------
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* Copyright (C) 2010 ARM Limited. All rights reserved.
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*
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* $Date: 29. November 2010
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* $Revision: V1.0.3
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*
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* Project: CMSIS DSP Library
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* Title: arm_mat_trans_q31.c
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*
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* Description: Q31 matrix transpose.
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*
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* Target Processor: Cortex-M4/Cortex-M3
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*
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* Version 1.0.3 2010/11/29
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* Re-organized the CMSIS folders and updated documentation.
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*
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* Version 1.0.2 2010/11/11
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* Documentation updated.
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*
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* Version 1.0.1 2010/10/05
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* Production release and review comments incorporated.
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*
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* Version 1.0.0 2010/09/20
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* Production release and review comments incorporated.
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*
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* Version 0.0.5 2010/04/26
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* incorporated review comments and updated with latest CMSIS layer
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*
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* Version 0.0.3 2010/03/10
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* Initial version
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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 Q31 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_q31(
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const arm_matrix_instance_q31 * pSrc,
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arm_matrix_instance_q31 * pDst)
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{
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q31_t *pIn = pSrc->pData; /* input data matrix pointer */
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q31_t *pOut = pDst->pData; /* output data matrix pointer */
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q31_t *px; /* Temporary output data matrix pointer */
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uint16_t nRows = pSrc->numRows; /* number of nRows */
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uint16_t nColumns = pSrc->numCols; /* number of nColumns */
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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
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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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/* Apply loop unrolling and exchange the columns with row elements */
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blkCnt = nColumns >> 2u;
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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)
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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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i++;
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/* Decrement the row loop counter */
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row--;
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}
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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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