1 /*
2 * SPDX-FileCopyrightText: Copyright 2010-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Licensed under the Apache License, Version 2.0 (the License); you may
7 * not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
14 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 /* ----------------------------------------------------------------------
20 * Project: CMSIS NN Library
21 * Title: arm_relu_q15.c
22 * Description: Q15 version of ReLU
23 *
24 * $Date: 31 January 2023
25 * $Revision: V.1.1.1
26 *
27 * Target : Arm(R) M-Profile Architecture
28 *
29 * -------------------------------------------------------------------- */
30
31 #include "arm_nnfunctions.h"
32 #include "arm_nnsupportfunctions.h"
33
34 /**
35 * @ingroup Public
36 */
37
38 /**
39 * @addtogroup Acti
40 * @{
41 */
42
43 /*
44 * Q15 ReLu function
45 *
46 * Refer header file for details.
47 *
48 */
49
arm_relu_q15(int16_t * data,uint16_t size)50 void arm_relu_q15(int16_t *data, uint16_t size)
51 {
52
53 #if defined(ARM_MATH_DSP) && !defined(ARM_MATH_MVEI)
54 /* Run the following code for M cores with DSP extension */
55
56 uint16_t i = size >> 1;
57 int16_t *input = data;
58 int16_t *output = data;
59 int32_t in;
60 int32_t buf;
61 int32_t mask;
62
63 while (i)
64 {
65 in = arm_nn_read_q15x2_ia((const int16_t **)&input);
66
67 /* extract the first bit */
68 buf = ROR(in & 0x80008000, 15);
69
70 /* if MSB=1, mask will be 0xFF, 0x0 otherwise */
71 mask = QSUB16(0x00000000, buf);
72
73 arm_nn_write_q15x2_ia(&output, in & (~mask));
74 i--;
75 }
76
77 if (size & 0x1)
78 {
79 if (*input < 0)
80 {
81 *input = 0;
82 }
83 input++;
84 }
85 #else
86 /* Run the following code as reference implementation for M cores without DSP extension */
87 uint16_t i;
88
89 for (i = 0; i < size; i++)
90 {
91 if (data[i] < 0)
92 data[i] = 0;
93 }
94
95 #endif /* ARM_MATH_DSP */
96 }
97
98 /**
99 * @} end of Acti group
100 */
101
