arm_mat_sub_q15.c
155 lines
| 4.7 KiB
| text/x-c
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CLexer
r71 | /* ---------------------------------------------------------------------- | |||
* Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
* | ||||
* $Date: 15. July 2011 | ||||
* $Revision: V1.0.10 | ||||
* | ||||
* Project: CMSIS DSP Library | ||||
* Title: arm_mat_sub_q15.c | ||||
* | ||||
* Description: Q15 Matrix subtraction | ||||
* | ||||
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 | ||||
* | ||||
* Version 1.0.10 2011/7/15 | ||||
* Big Endian support added and Merged M0 and M3/M4 Source code. | ||||
* | ||||
* Version 1.0.3 2010/11/29 | ||||
* Re-organized the CMSIS folders and updated documentation. | ||||
* | ||||
* Version 1.0.2 2010/11/11 | ||||
* Documentation updated. | ||||
* | ||||
* Version 1.0.1 2010/10/05 | ||||
* Production release and review comments incorporated. | ||||
* | ||||
* Version 1.0.0 2010/09/20 | ||||
* Production release and review comments incorporated. | ||||
* | ||||
* Version 0.0.5 2010/04/26 | ||||
* incorporated review comments and updated with latest CMSIS layer | ||||
* | ||||
* Version 0.0.3 2010/03/10 | ||||
* Initial version | ||||
* -------------------------------------------------------------------- */ | ||||
#include "arm_math.h" | ||||
/** | ||||
* @ingroup groupMatrix | ||||
*/ | ||||
/** | ||||
* @addtogroup MatrixSub | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Q15 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. | ||||
* | ||||
* <b>Scaling and Overflow Behavior:</b> | ||||
* \par | ||||
* The function uses saturating arithmetic. | ||||
* Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated. | ||||
*/ | ||||
arm_status arm_mat_sub_q15( | ||||
const arm_matrix_instance_q15 * pSrcA, | ||||
const arm_matrix_instance_q15 * pSrcB, | ||||
arm_matrix_instance_q15 * pDst) | ||||
{ | ||||
q15_t *pInA = pSrcA->pData; /* input data matrix pointer A */ | ||||
q15_t *pInB = pSrcB->pData; /* input data matrix pointer B */ | ||||
q15_t *pOut = pDst->pData; /* output data matrix pointer */ | ||||
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; | ||||
#ifndef ARM_MATH_CM0 | ||||
/* Run the below code for Cortex-M4 and Cortex-M3 */ | ||||
/* Apply 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, Saturate and then store the results in the destination buffer. */ | ||||
*__SIMD32(pOut)++ = __QSUB16(*__SIMD32(pInA)++, *__SIMD32(pInB)++); | ||||
*__SIMD32(pOut)++ = __QSUB16(*__SIMD32(pInA)++, *__SIMD32(pInB)++); | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
/* If the blockSize is not a multiple of 4, compute any remaining output samples here. | ||||
** No loop unrolling is used. */ | ||||
blkCnt = numSamples % 0x4u; | ||||
while(blkCnt > 0u) | ||||
{ | ||||
/* C(m,n) = A(m,n) - B(m,n) */ | ||||
/* Subtract and then store the results in the destination buffer. */ | ||||
*pOut++ = (q15_t) __QSUB16(*pInA++, *pInB++); | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
#else | ||||
/* Run the below code for Cortex-M0 */ | ||||
/* Initialize blkCnt with number of samples */ | ||||
blkCnt = numSamples; | ||||
while(blkCnt > 0u) | ||||
{ | ||||
/* C(m,n) = A(m,n) - B(m,n) */ | ||||
/* Subtract and then store the results in the destination buffer. */ | ||||
*pOut++ = (q15_t) __SSAT(((q31_t) * pInA++ - *pInB++), 16); | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
#endif /* #ifndef ARM_MATH_CM0 */ | ||||
/* Set status as ARM_MATH_SUCCESS */ | ||||
status = ARM_MATH_SUCCESS; | ||||
} | ||||
/* Return to application */ | ||||
return (status); | ||||
} | ||||
/** | ||||
* @} end of MatrixSub group | ||||
*/ | ||||