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b2cb5e02 | 1 | /* nearbyint(). RISC-V version. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
b2cb5e02 PD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library. If not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <math.h> | |
70e2ba33 | 20 | #include <fenv_private.h> |
b2cb5e02 PD |
21 | #include <libm-alias-double.h> |
22 | #include <stdint.h> | |
23 | ||
24 | double | |
25 | __nearbyint (double x) | |
26 | { | |
27 | int flags = riscv_getflags (); | |
28 | bool nan = isnan (x); | |
29 | double mag = fabs (x); | |
30 | ||
31 | if (nan) | |
32 | return x + x; | |
33 | ||
34 | if (mag < (1ULL << __DBL_MANT_DIG__)) | |
35 | { | |
36 | int64_t i; | |
37 | double new_x; | |
38 | ||
39 | asm volatile ("fcvt.l.d %0, %1" : "=r" (i) : "f" (x)); | |
40 | asm volatile ("fcvt.d.l %0, %1" : "=f" (new_x) : "r" (i)); | |
41 | ||
42 | /* nearbyint(-0) == -0, and in general we'll always have the same | |
43 | sign as our input. */ | |
44 | x = copysign (new_x, x); | |
45 | ||
46 | riscv_setflags (flags); | |
47 | } | |
48 | ||
49 | return x; | |
50 | } | |
51 | ||
52 | libm_alias_double (__nearbyint, nearbyint) |