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  1. /* ----------------------------------------------------------------------
  2.  * Project:      CMSIS DSP Library
  3.  * Title:        arm_mat_add_q15.c
  4.  * Description:  Q15 matrix addition
  5.  *
  6.  * $Date:        27. January 2017
  7.  * $Revision:    V.1.5.1
  8.  *
  9.  * Target Processor: Cortex-M cores
  10.  * -------------------------------------------------------------------- */
  11. /*
  12.  * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
  13.  *
  14.  * SPDX-License-Identifier: Apache-2.0
  15.  *
  16.  * Licensed under the Apache License, Version 2.0 (the License); you may
  17.  * not use this file except in compliance with the License.
  18.  * You may obtain a copy of the License at
  19.  *
  20.  * www.apache.org/licenses/LICENSE-2.0
  21.  *
  22.  * Unless required by applicable law or agreed to in writing, software
  23.  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
  24.  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  25.  * See the License for the specific language governing permissions and
  26.  * limitations under the License.
  27.  */
  28.  
  29. #include "arm_math.h"
  30.  
  31. /**
  32.  * @ingroup groupMatrix
  33.  */
  34.  
  35. /**
  36.  * @addtogroup MatrixAdd
  37.  * @{
  38.  */
  39.  
  40. /**
  41.  * @brief Q15 matrix addition.
  42.  * @param[in]       *pSrcA points to the first input matrix structure
  43.  * @param[in]       *pSrcB points to the second input matrix structure
  44.  * @param[out]      *pDst points to output matrix structure
  45.  * @return              The function returns either
  46.  * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
  47.  *
  48.  * <b>Scaling and Overflow Behavior:</b>
  49.  * \par
  50.  * The function uses saturating arithmetic.
  51.  * Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated.
  52.  */
  53.  
  54. arm_status arm_mat_add_q15(
  55.   const arm_matrix_instance_q15 * pSrcA,
  56.   const arm_matrix_instance_q15 * pSrcB,
  57.   arm_matrix_instance_q15 * pDst)
  58. {
  59.   q15_t *pInA = pSrcA->pData;                    /* input data matrix pointer A  */
  60.   q15_t *pInB = pSrcB->pData;                    /* input data matrix pointer B */
  61.   q15_t *pOut = pDst->pData;                     /* output data matrix pointer */
  62.   uint16_t numSamples;                           /* total number of elements in the matrix  */
  63.   uint32_t blkCnt;                               /* loop counters  */
  64.   arm_status status;                             /* status of matrix addition  */
  65.  
  66. #ifdef ARM_MATH_MATRIX_CHECK
  67.  
  68.  
  69.   /* Check for matrix mismatch condition */
  70.   if ((pSrcA->numRows != pSrcB->numRows) ||
  71.      (pSrcA->numCols != pSrcB->numCols) ||
  72.      (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
  73.   {
  74.     /* Set status as ARM_MATH_SIZE_MISMATCH */
  75.     status = ARM_MATH_SIZE_MISMATCH;
  76.   }
  77.   else
  78. #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
  79.  
  80.   {
  81.     /* Total number of samples in the input matrix */
  82.     numSamples = (uint16_t) (pSrcA->numRows * pSrcA->numCols);
  83.  
  84. #if defined (ARM_MATH_DSP)
  85.  
  86.     /* Run the below code for Cortex-M4 and Cortex-M3 */
  87.  
  88.     /* Loop unrolling */
  89.     blkCnt = (uint32_t) numSamples >> 2U;
  90.  
  91.     /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  92.      ** a second loop below computes the remaining 1 to 3 samples. */
  93.     while (blkCnt > 0U)
  94.     {
  95.       /* C(m,n) = A(m,n) + B(m,n) */
  96.       /* Add, Saturate and then store the results in the destination buffer. */
  97.       *__SIMD32(pOut)++ = __QADD16(*__SIMD32(pInA)++, *__SIMD32(pInB)++);
  98.       *__SIMD32(pOut)++ = __QADD16(*__SIMD32(pInA)++, *__SIMD32(pInB)++);
  99.  
  100.       /* Decrement the loop counter */
  101.       blkCnt--;
  102.     }
  103.  
  104.     /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  105.      ** No loop unrolling is used. */
  106.     blkCnt = (uint32_t) numSamples % 0x4U;
  107.  
  108.     /* q15 pointers of input and output are initialized */
  109.  
  110.     while (blkCnt > 0U)
  111.     {
  112.       /* C(m,n) = A(m,n) + B(m,n) */
  113.       /* Add, Saturate and then store the results in the destination buffer. */
  114.       *pOut++ = (q15_t) __QADD16(*pInA++, *pInB++);
  115.  
  116.       /* Decrement the loop counter */
  117.       blkCnt--;
  118.     }
  119.  
  120. #else
  121.  
  122.     /* Run the below code for Cortex-M0 */
  123.  
  124.     /* Initialize blkCnt with number of samples */
  125.     blkCnt = (uint32_t) numSamples;
  126.  
  127.  
  128.     /* q15 pointers of input and output are initialized */
  129.     while (blkCnt > 0U)
  130.     {
  131.       /* C(m,n) = A(m,n) + B(m,n) */
  132.       /* Add, Saturate and then store the results in the destination buffer. */
  133.       *pOut++ = (q15_t) __SSAT(((q31_t) * pInA++ + *pInB++), 16);
  134.  
  135.       /* Decrement the loop counter */
  136.       blkCnt--;
  137.     }
  138.  
  139. #endif /* #if defined (ARM_MATH_DSP) */
  140.  
  141.     /* set status as ARM_MATH_SUCCESS */
  142.     status = ARM_MATH_SUCCESS;
  143.   }
  144.  
  145.   /* Return to application */
  146.   return (status);
  147. }
  148.  
  149. /**
  150.  * @} end of MatrixAdd group
  151.  */
  152.