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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: 15. July 2011
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* $Revision: V1.0.10
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*
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* Project: CMSIS DSP Library
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* Title: arm_mat_sub_q15.c
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*
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* Description: Q15 Matrix subtraction
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*
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*
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* Version 1.0.10 2011/7/15
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* Big Endian support added and Merged M0 and M3/M4 Source code.
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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 MatrixSub
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* @{
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*/
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/**
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* @brief Q15 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 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_sub_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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uint32_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 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) || (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 = (uint32_t) pSrcA->numRows * pSrcA->numCols;
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#ifndef ARM_MATH_CM0
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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/* Apply loop unrolling */
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blkCnt = 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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/* Subtract, Saturate and then store the results in the destination buffer. */
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*__SIMD32(pOut)++ = __QSUB16(*__SIMD32(pInA)++, *__SIMD32(pInB)++);
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*__SIMD32(pOut)++ = __QSUB16(*__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 = numSamples % 0x4u;
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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 then store the results in the destination buffer. */
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*pOut++ = (q15_t) __QSUB16(*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 = numSamples;
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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 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 /* #ifndef ARM_MATH_CM0 */
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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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