1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_sub_f64.c
 4   * Description:  Floating-point vector subtraction
 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 BasicSub
37    @{
38   */
39  
40  /**
41    @brief         Floating-point vector subtraction.
42    @param[in]     pSrcA      points to the first input vector
43    @param[in]     pSrcB      points to the second 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_sub_f64(
50    const float64_t * pSrcA,
51    const float64_t * pSrcB,
52          float64_t * pDst,
53          uint32_t blockSize)
54  {
55    uint32_t blkCnt;                               /* Loop counter */
56  
57    /* Initialize blkCnt with number of samples */
58    blkCnt = blockSize;
59  
60    while (blkCnt > 0U)
61    {
62      /* C = A - B */
63  
64      /* Subtract and store result in destination buffer. */
65      *pDst++ = (*pSrcA++) - (*pSrcB++);
66  
67      /* Decrement loop counter */
68      blkCnt--;
69    }
70  
71  }
72  
73  /**
74    @} end of BasicSub group
75   */