CMSIS DSP Lib
Fork of mbed-dsp by
cmsis_dsp/MatrixFunctions/arm_mat_add_q15.c
- Committer:
- emilmont
- Date:
- 2013-05-30
- Revision:
- 2:da51fb522205
- Parent:
- 1:fdd22bb7aa52
- Child:
- 3:7a284390b0ce
File content as of revision 2:da51fb522205:
/* ---------------------------------------------------------------------- * Copyright (C) 2010 ARM Limited. All rights reserved. * * $Date: 15. February 2012 * $Revision: V1.1.0 * * Project: CMSIS DSP Library * Title: arm_mat_add_q15.c * * Description: Q15 matrix addition * * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 * * Version 1.1.0 2012/02/15 * Updated with more optimizations, bug fixes and minor API changes. * * 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 MatrixAdd * @{ */ /** * @brief Q15 matrix addition. * @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_add_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 */ uint16_t numSamples; /* total number of elements in the matrix */ uint32_t blkCnt; /* loop counters */ arm_status status; /* status of matrix addition */ #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 = (uint16_t) (pSrcA->numRows * pSrcA->numCols); #ifndef ARM_MATH_CM0 /* Run the below code for Cortex-M4 and Cortex-M3 */ /* Loop unrolling */ blkCnt = (uint32_t) 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) */ /* Add, Saturate and then store the results in the destination buffer. */ *__SIMD32(pOut)++ = __QADD16(*__SIMD32(pInA)++, *__SIMD32(pInB)++); *__SIMD32(pOut)++ = __QADD16(*__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 = (uint32_t) numSamples % 0x4u; /* q15 pointers of input and output are initialized */ while(blkCnt > 0u) { /* C(m,n) = A(m,n) + B(m,n) */ /* Add, Saturate and then store the results in the destination buffer. */ *pOut++ = (q15_t) __QADD16(*pInA++, *pInB++); /* Decrement the loop counter */ blkCnt--; } #else /* Run the below code for Cortex-M0 */ /* Initialize blkCnt with number of samples */ blkCnt = (uint32_t) numSamples; /* q15 pointers of input and output are initialized */ while(blkCnt > 0u) { /* C(m,n) = A(m,n) + B(m,n) */ /* Add, Saturate 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 MatrixAdd group */