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144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mat_sub_f64.c
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* Description: Floating-point matrix subtraction
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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 MatrixSub Matrix Subtraction
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Subtract two matrices.
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\image html MatrixSubtraction.gif "Subraction of two 3 x 3 matrices"
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The functions check to make sure that
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<code>pSrcA</code>, <code>pSrcB</code>, and <code>pDst</code> have the same
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number of rows and columns.
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*/
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/**
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@addtogroup MatrixSub
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@{
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*/
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/**
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@brief Floating-point matrix subtraction.
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@param[in] pSrcA points to the first input matrix structure
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@param[in] pSrcB points to the second input matrix structure
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@param[out] pDst points to output matrix structure
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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_sub_f64(
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const arm_matrix_instance_f64 * pSrcA,
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const arm_matrix_instance_f64 * pSrcB,
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arm_matrix_instance_f64 * pDst)
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{
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float64_t *pInA = pSrcA->pData; /* input data matrix pointer A */
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float64_t *pInB = pSrcB->pData; /* input data matrix pointer B */
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float64_t *pOut = pDst->pData; /* output data matrix pointer */
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uint64_t numSamples; /* total number of elements in the matrix */
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uint64_t blkCnt; /* loop counters */
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arm_status status; /* status of matrix subtraction */
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#ifdef ARM_MATH_MATRIX_CHECK
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/* Check for matrix mismatch condition */
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if ((pSrcA->numRows != pSrcB->numRows) ||
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(pSrcA->numCols != pSrcB->numCols) ||
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(pSrcA->numRows != pDst->numRows) ||
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(pSrcA->numCols != pDst->numCols) )
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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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/* Total number of samples in input matrix */
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numSamples = (uint64_t) pSrcA->numRows * pSrcA->numCols;
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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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blkCnt = numSamples >> 2U;
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while (blkCnt > 0U)
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{
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/* C(m,n) = A(m,n) - B(m,n) */
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/* Subtract and store result in destination buffer. */
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*pOut++ = (*pInA++) - (*pInB++);
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*pOut++ = (*pInA++) - (*pInB++);
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*pOut++ = (*pInA++) - (*pInB++);
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*pOut++ = (*pInA++) - (*pInB++);
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Loop unrolling: Compute remaining outputs */
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blkCnt = numSamples % 0x4U;
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#else
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/* Initialize blkCnt with number of samples */
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blkCnt = numSamples;
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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while (blkCnt > 0U)
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{
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/* C(m,n) = A(m,n) - B(m,n) */
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/* Subtract and store result in destination buffer. */
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*pOut++ = (*pInA++) - (*pInB++);
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/* Decrement loop counter */
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blkCnt--;
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}
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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 MatrixSub group
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*/
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