1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_vlog_f64.c
 4   * Description:  Fast vectorized log
 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/fast_math_functions.h"
30  #include "arm_common_tables.h"
31  
32  void arm_vexp_f64(
33    const float64_t * pSrc,
34          float64_t * pDst,
35          uint32_t blockSize)
36  {
37     uint32_t blkCnt; 
38  
39     blkCnt = blockSize;
40  
41     while (blkCnt > 0U)
42     {
43        /* C = log(A) */
44    
45        /* Calculate log and store result in destination buffer. */
46        *pDst++ = exp(*pSrc++);
47    
48        /* Decrement loop counter */
49        blkCnt--;
50     }
51  }