1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_negate_f64.c
 4   * Description:  Negates floating-point vectors
 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 BasicNegate
37    @{
38   */
39  
40  /**
41    @brief         Negates the elements of a floating-point vector.
42    @param[in]     pSrc       points to input vector.
43    @param[out]    pDst       points to output vector.
44    @param[in]     blockSize  number of samples in each vector.
45    @return        none
46   */
47  
48  void arm_negate_f64(
49    const float64_t * pSrc,
50          float64_t * pDst,
51          uint32_t blockSize)
52  {
53    uint32_t blkCnt;                               /* Loop counter */
54  
55    /* Initialize blkCnt with number of samples */
56    blkCnt = blockSize;
57  
58    while (blkCnt > 0U)
59    {
60      /* C = -A */
61  
62      /* Negate and store result in destination buffer. */
63      *pDst++ = -*pSrc++;
64  
65      /* Decrement loop counter */
66      blkCnt--;
67    }
68  
69  }
70  
71  /**
72    @} end of BasicNegate group
73   */