152 lines
4.6 KiB
C
152 lines
4.6 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mat_add_q15.c
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* Description: Q15 matrix addition
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*
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* $Date: 27. January 2017
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* $Revision: V.1.5.1
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*
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* Target Processor: Cortex-M cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2017 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 "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 MatrixAdd
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* @{
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*/
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/**
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* @brief Q15 matrix addition.
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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 The function returns either
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* <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
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*
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* <b>Scaling and Overflow Behavior:</b>
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* \par
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* The function uses saturating arithmetic.
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* Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated.
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*/
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arm_status arm_mat_add_q15(
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const arm_matrix_instance_q15 * pSrcA,
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const arm_matrix_instance_q15 * pSrcB,
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arm_matrix_instance_q15 * pDst)
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{
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q15_t *pInA = pSrcA->pData; /* input data matrix pointer A */
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q15_t *pInB = pSrcB->pData; /* input data matrix pointer B */
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q15_t *pOut = pDst->pData; /* output data matrix pointer */
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uint16_t numSamples; /* total number of elements in the matrix */
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uint32_t blkCnt; /* loop counters */
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arm_status status; /* status of matrix addition */
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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) || (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 the input matrix */
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numSamples = (uint16_t) (pSrcA->numRows * pSrcA->numCols);
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#if defined (ARM_MATH_DSP)
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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/* Loop unrolling */
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blkCnt = (uint32_t) numSamples >> 2U;
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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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/* C(m,n) = A(m,n) + B(m,n) */
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/* Add, Saturate and then store the results in the destination buffer. */
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*__SIMD32(pOut)++ = __QADD16(*__SIMD32(pInA)++, *__SIMD32(pInB)++);
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*__SIMD32(pOut)++ = __QADD16(*__SIMD32(pInA)++, *__SIMD32(pInB)++);
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = (uint32_t) numSamples % 0x4U;
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/* q15 pointers of input and output are initialized */
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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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/* Add, Saturate and then store the results in the destination buffer. */
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*pOut++ = (q15_t) __QADD16(*pInA++, *pInB++);
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/* Decrement the loop counter */
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blkCnt--;
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}
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#else
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/* Run the below code for Cortex-M0 */
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/* Initialize blkCnt with number of samples */
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blkCnt = (uint32_t) numSamples;
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/* q15 pointers of input and output are initialized */
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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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/* Add, Saturate and then store the results in the destination buffer. */
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*pOut++ = (q15_t) __SSAT(((q31_t) * pInA++ + *pInB++), 16);
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/* Decrement the loop counter */
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blkCnt--;
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}
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#endif /* #if defined (ARM_MATH_DSP) */
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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 MatrixAdd group
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*/
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