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 */
46
arm_negate_f64(const float64_t * pSrc,float64_t * pDst,uint32_t blockSize)47 ARM_DSP_ATTRIBUTE void arm_negate_f64(
48 const float64_t * pSrc,
49 float64_t * pDst,
50 uint32_t blockSize)
51 {
52 uint32_t blkCnt; /* Loop counter */
53
54 /* Initialize blkCnt with number of samples */
55 blkCnt = blockSize;
56
57 while (blkCnt > 0U)
58 {
59 /* C = -A */
60
61 /* Negate and store result in destination buffer. */
62 *pDst++ = -*pSrc++;
63
64 /* Decrement loop counter */
65 blkCnt--;
66 }
67
68 }
69
70 /**
71 @} end of BasicNegate group
72 */
73
