1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_logsumexp_f32.c
 4   * Description:  LogSumExp
 5   *
 6   * $Date:        23 April 2021
 7   * $Revision:    V1.9.0
 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/statistics_functions.h"
30  #include <limits.h>
31  #include <math.h>
32  
33  
34  /**
35   * @addtogroup LogSumExp
36   * @{
37   */
38  
39  
40  /**
41   * @brief Dot product with log arithmetic
42   *
43   * Vectors are containing the log of the samples
44   *
45   * @param[in]       *pSrcA points to the first input vector
46   * @param[in]       *pSrcB points to the second input vector
47   * @param[in]       blockSize number of samples in each vector
48   * @param[in]       *pTmpBuffer temporary buffer of length blockSize
49   * @return The log of the dot product.
50   *
51   */
52  
53  
54  float32_t arm_logsumexp_dot_prod_f32(const float32_t * pSrcA,
55    const float32_t * pSrcB,
56    uint32_t blockSize,
57    float32_t *pTmpBuffer)
58  {
59      float32_t result;
60      arm_add_f32((float32_t*)pSrcA, (float32_t*)pSrcB, pTmpBuffer, blockSize);
61  
62      result = arm_logsumexp_f32(pTmpBuffer, blockSize);
63      return(result);
64  }
65  
66  /**
67   * @} end of LogSumExp group
68   */