1 /* ----------------------------------------------------------------------
2  * Project:      CMSIS DSP Library
3  * Title:        arm_vlog_f32.c
4  * Description:  Fast vectorized log
5  *
6  * $Date:        23 April 2021
7  * $Revision:    V1.9.0
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/fast_math_functions.h"
30 #include "arm_common_tables.h"
31 
32 #if (defined(ARM_MATH_MVEF) || defined(ARM_MATH_HELIUM) || defined(ARM_MATH_NEON) || defined(ARM_MATH_NEON_EXPERIMENTAL)) && !defined(ARM_MATH_AUTOVECTORIZE)
33 #include "arm_vec_math.h"
34 #endif
35 
arm_vlog_f32(const float32_t * pSrc,float32_t * pDst,uint32_t blockSize)36 void arm_vlog_f32(
37   const float32_t * pSrc,
38         float32_t * pDst,
39         uint32_t blockSize)
40 {
41    uint32_t blkCnt;
42 
43 #if (defined(ARM_MATH_MVEF) || defined(ARM_MATH_HELIUM)) && !defined(ARM_MATH_AUTOVECTORIZE)
44    f32x4_t src;
45    f32x4_t dst;
46 
47    blkCnt = blockSize >> 2;
48 
49    while (blkCnt > 0U)
50    {
51       src = vld1q(pSrc);
52       dst = vlogq_f32(src);
53       vst1q(pDst, dst);
54 
55       pSrc += 4;
56       pDst += 4;
57       /* Decrement loop counter */
58       blkCnt--;
59    }
60 
61    blkCnt = blockSize & 3;
62 #else
63 #if (defined(ARM_MATH_NEON) || defined(ARM_MATH_NEON_EXPERIMENTAL)) && !defined(ARM_MATH_AUTOVECTORIZE)
64    f32x4_t src;
65    f32x4_t dst;
66 
67    blkCnt = blockSize >> 2;
68 
69    while (blkCnt > 0U)
70    {
71       src = vld1q_f32(pSrc);
72       dst = vlogq_f32(src);
73       vst1q_f32(pDst, dst);
74 
75       pSrc += 4;
76       pDst += 4;
77       /* Decrement loop counter */
78       blkCnt--;
79    }
80 
81    blkCnt = blockSize & 3;
82 #else
83    blkCnt = blockSize;
84 #endif
85 #endif
86 
87    while (blkCnt > 0U)
88    {
89       /* C = log(A) */
90 
91       /* Calculate log and store result in destination buffer. */
92       *pDst++ = logf(*pSrc++);
93 
94       /* Decrement loop counter */
95       blkCnt--;
96    }
97 }
98