1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_abs_f64.c
 4   * Description:  Floating-point vector absolute value
 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  #include <math.h>
31  
32  /**
33    @ingroup groupMath
34   */
35  
36  /**
37    @addtogroup BasicAbs
38    @{
39   */
40  
41  /**
42    @brief         Floating-point vector absolute value.
43    @param[in]     pSrc       points to the input vector
44    @param[out]    pDst       points to the output vector
45    @param[in]     blockSize  number of samples in each vector
46    @return        none
47   */
48  
49  void arm_abs_f64(
50    const float64_t * pSrc,
51          float64_t * pDst,
52          uint32_t blockSize)
53  {
54    uint32_t blkCnt;                               /* Loop counter */
55  
56    /* Initialize blkCnt with number of samples */
57    blkCnt = blockSize;
58  
59    while (blkCnt > 0U)
60    {
61      /* C = |A| */
62  
63      /* Calculate absolute and store result in destination buffer. */
64      *pDst++ = fabs(*pSrc++);
65  
66      /* Decrement loop counter */
67      blkCnt--;
68    }
69  
70  }
71  
72  /**
73    @} end of BasicAbs group
74   */