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_vexp_f32(const float32_t * pSrc,float32_t * pDst,uint32_t blockSize)36 void arm_vexp_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 = vexpq_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 = vexpq_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++ = expf(*pSrc++);
93
94 /* Decrement loop counter */
95 blkCnt--;
96 }
97 }
98
