1 /*
2 * Copyright (c) 2017-2019 Arm Limited.
3 *
4 * SPDX-License-Identifier: MIT
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25 #include "arm_compute/core/Rounding.h"
26
27 #include "arm_compute/core/Error.h"
28 #include "support/ToolchainSupport.h"
29
30 #include <cmath>
31
32 using namespace arm_compute;
33 using namespace std;
34
round(float x,RoundingPolicy rounding_policy)35 int arm_compute::round(float x, RoundingPolicy rounding_policy)
36 {
37 using namespace std;
38 int rounded = 0;
39 switch(rounding_policy)
40 {
41 case RoundingPolicy::TO_ZERO:
42 {
43 rounded = static_cast<int>(x);
44 break;
45 }
46 case RoundingPolicy::TO_NEAREST_UP:
47 {
48 rounded = static_cast<int>(support::cpp11::round(x));
49 break;
50 }
51 case RoundingPolicy::TO_NEAREST_EVEN:
52 {
53 #ifdef __aarch64__
54 asm("fcvtns %x[res], %s[value]"
55 : [res] "=r"(rounded)
56 : [value] "w"(x));
57 #else // __aarch64__
58 ARM_COMPUTE_ERROR("TO_NEAREST_EVEN rounding policy is not supported.");
59 #endif // __aarch64__
60 break;
61 }
62 default:
63 {
64 ARM_COMPUTE_ERROR("Unsupported rounding policy.");
65 break;
66 }
67 }
68
69 return rounded;
70 }
71