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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_mat_sub_f32.c
* Description: Floating-point matrix subtraction
*
* $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.
*/
#include "arm_math.h"
/**
* @ingroup groupMatrix
*/
/**
* @defgroup MatrixSub Matrix Subtraction
*
* Subtract two matrices.
* \image html MatrixSubtraction.gif "Subraction of two 3 x 3 matrices"
*
* The functions check to make sure that
* <code>pSrcA</code>, <code>pSrcB</code>, and <code>pDst</code> have the same
* number of rows and columns.
*/
/**
* @addtogroup MatrixSub
* @{
*/
/**
* @brief Floating-point matrix subtraction
* @param[in] *pSrcA points to the first input matrix structure
* @param[in] *pSrcB points to the second input matrix structure
* @param[out] *pDst points to output matrix structure
* @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_sub_f32(
const arm_matrix_instance_f32 * pSrcA,
const arm_matrix_instance_f32 * pSrcB,
arm_matrix_instance_f32 * pDst)
{
float32_t *pIn1 = pSrcA->pData; /* input data matrix pointer A */
float32_t *pIn2 = pSrcB->pData; /* input data matrix pointer B */
float32_t *pOut = pDst->pData; /* output data matrix pointer */
#if defined (ARM_MATH_DSP)
float32_t inA1, inA2, inB1, inB2, out1, out2; /* temporary variables */
#endif // #if defined (ARM_MATH_DSP)
uint32_t numSamples; /* total number of elements in the matrix */
uint32_t blkCnt; /* loop counters */
arm_status status; /* status of matrix subtraction */
#ifdef ARM_MATH_MATRIX_CHECK
/* Check for matrix mismatch condition */
if ((pSrcA->numRows != pSrcB->numRows) ||
(pSrcA->numCols != pSrcB->numCols) ||
(pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
{
/* Set status as ARM_MATH_SIZE_MISMATCH */
status = ARM_MATH_SIZE_MISMATCH;
}
else
#endif /* #ifdef ARM_MATH_MATRIX_CHECK */
{
/* Total number of samples in the input matrix */
numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
#if defined (ARM_MATH_DSP)
/* Run the below code for Cortex-M4 and Cortex-M3 */
/* Loop Unrolling */
blkCnt = numSamples >> 2U;
/* 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)
{
/* C(m,n) = A(m,n) - B(m,n) */
/* Subtract and then store the results in the destination buffer. */
/* Read values from source A */
inA1 = pIn1[0];
/* Read values from source B */
inB1 = pIn2[0];
/* Read values from source A */
inA2 = pIn1[1];
/* out = sourceA - sourceB */
out1 = inA1 - inB1;
/* Read values from source B */
inB2 = pIn2[1];
/* Read values from source A */
inA1 = pIn1[2];
/* out = sourceA - sourceB */
out2 = inA2 - inB2;
/* Read values from source B */
inB1 = pIn2[2];
/* Store result in destination */
pOut[0] = out1;
pOut[1] = out2;
/* Read values from source A */
inA2 = pIn1[3];
/* Read values from source B */
inB2 = pIn2[3];
/* out = sourceA - sourceB */
out1 = inA1 - inB1;
/* out = sourceA - sourceB */
out2 = inA2 - inB2;
/* Store result in destination */
pOut[2] = out1;
/* Store result in destination */
pOut[3] = out2;
/* update pointers to process next sampels */
pIn1 += 4U;
pIn2 += 4U;
pOut += 4U;
/* Decrement the loop counter */
blkCnt--;
}
/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
** No loop unrolling is used. */
blkCnt = numSamples % 0x4U;
#else
/* Run the below code for Cortex-M0 */
/* Initialize blkCnt with number of samples */
blkCnt = numSamples;
#endif /* #if defined (ARM_MATH_DSP) */
while (blkCnt > 0U)
{
/* C(m,n) = A(m,n) - B(m,n) */
/* Subtract and then store the results in the destination buffer. */
*pOut++ = (*pIn1++) - (*pIn2++);
/* Decrement the loop counter */
blkCnt--;
}
/* Set status as ARM_MATH_SUCCESS */
status = ARM_MATH_SUCCESS;
}
/* Return to application */
return (status);
}
/**
* @} end of MatrixSub group
*/
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