1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_dot_prod_f64.c
 4   * Description:  Floating-point dot product
 5   *
 6   * $Date:        13 September 2021
 7   * $Revision:    V1.10.0
 8   *
 9   * Target Processor: Cortex-M and Cortex-A cores
10   * -------------------------------------------------------------------- */
11  /*
12   * Copyright (C) 2010-2021 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 "dsp/basic_math_functions.h"
30  
31  /**
32    @ingroup groupMath
33   */
34  
35  /**
36    @addtogroup BasicDotProd
37    @{
38   */
39  
40  /**
41    @brief         Dot product of floating-point vectors.
42    @param[in]     pSrcA      points to the first input vector.
43    @param[in]     pSrcB      points to the second input vector.
44    @param[in]     blockSize  number of samples in each vector.
45    @param[out]    result     output result returned here.
46    @return        none
47   */
48  
49  void arm_dot_prod_f64(
50    const float64_t * pSrcA,
51    const float64_t * pSrcB,
52          uint32_t blockSize,
53          float64_t * result)
54  {
55    uint32_t blkCnt;                               /* Loop counter */
56    float64_t sum = 0.;                            /* Temporary return variable */
57  
58    /* Initialize blkCnt with number of samples */
59    blkCnt = blockSize;
60  
61    while (blkCnt > 0U)
62    {
63      /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
64  
65      /* Calculate dot product and store result in a temporary buffer. */
66      sum += (*pSrcA++) * (*pSrcB++);
67  
68      /* Decrement loop counter */
69      blkCnt--;
70    }
71  
72    /* Store result in destination buffer */
73    *result = sum;
74  }
75  
76  /**
77    @} end of BasicDotProd group
78   */