1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_max_no_idx_f64.c
4 * Description: Maximum value of a floating-point vector without returning the index
5 *
6 * $Date: 10 August 2022
7 * $Revision: V1.10.1
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/statistics_functions.h"
30
31 /**
32 @ingroup groupStats
33 */
34
35
36 /**
37 @addtogroup Max
38 @{
39 */
40
41 /**
42 @brief Maximum value of a floating-point vector.
43 @param[in] pSrc points to the input vector
44 @param[in] blockSize number of samples in input vector
45 @param[out] pResult maximum value returned here
46 */
47 #if defined(ARM_MATH_NEON) && defined(__aarch64__)
arm_max_no_idx_f64(const float64_t * pSrc,uint32_t blockSize,float64_t * pResult)48 ARM_DSP_ATTRIBUTE void arm_max_no_idx_f64(
49 const float64_t * pSrc,
50 uint32_t blockSize,
51 float64_t * pResult)
52 {
53 float64_t maxVal , in; /* Temporary variables to store the output value. */
54 uint32_t blkCnt; /* Loop counter */
55
56 float64x2_t maxV;
57 float64x2_t pSrcV ;
58 pSrcV = vld1q_f64(pSrc);
59 pSrc += 2 ;
60 maxV = pSrcV;
61
62
63
64
65 /* Load first input value that act as reference value for comparision */
66
67
68 /* Initialize blkCnt with number of samples */
69 blkCnt = (blockSize - 2U) >> 1U;
70
71 while (blkCnt > 0U)
72 {
73 /* Initialize maxVal to the next consecutive values one by one */
74 pSrcV = vld1q_f64(pSrc);
75 maxV = vmaxq_f64(maxV, pSrcV);
76
77 pSrc += 2 ;
78
79 /* Decrement loop counter */
80 blkCnt--;
81 }
82 maxVal =vgetq_lane_f64(maxV, 0);
83 if(maxVal < vgetq_lane_f64(maxV, 1))
84 {
85 maxVal = vgetq_lane_f64(maxV, 1);
86 }
87 blkCnt = (blockSize - 2U) & 1;
88
89 while (blkCnt > 0U)
90 {
91 /* Initialize maxVal to the next consecutive values one by one */
92 in = *pSrc++;
93
94 /* compare for the maximum value */
95 if (maxVal < in)
96 {
97 /* Update the maximum value and it's index */
98 maxVal = in;
99 }
100
101 /* Decrement loop counter */
102 blkCnt--;
103 }
104 *pResult = maxVal;
105
106
107 /* Store the maximum value and it's index into destination pointers */
108
109 }
110 #else
arm_max_no_idx_f64(const float64_t * pSrc,uint32_t blockSize,float64_t * pResult)111 ARM_DSP_ATTRIBUTE void arm_max_no_idx_f64(
112 const float64_t *pSrc,
113 uint32_t blockSize,
114 float64_t *pResult)
115 {
116 float64_t maxValue = F64_MIN;
117 float64_t newVal;
118
119 while (blockSize > 0U)
120 {
121 newVal = *pSrc++;
122
123 /* compare for the maximum value */
124 if (maxValue < newVal)
125 {
126 /* Update the maximum value and it's index */
127 maxValue = newVal;
128 }
129
130 blockSize --;
131 }
132
133 *pResult = maxValue;
134 }
135 #endif
136
137 /**
138 @} end of Max group
139 */
140
