1 | /* Round to int floating-point values. RISC-V version. |
2 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <math.h> |
20 | #include <fenv_private.h> |
21 | #include <libm-alias-float.h> |
22 | #include <stdint.h> |
23 | |
24 | float |
25 | __nearbyintf (float x) |
26 | { |
27 | int flags = riscv_getflags (); |
28 | bool nan = isnan (x); |
29 | float mag = fabsf (x: x); |
30 | |
31 | if (nan) |
32 | return x + x; |
33 | |
34 | if (mag < (1 << __FLT_MANT_DIG__)) |
35 | { |
36 | int32_t i; |
37 | float new_x; |
38 | |
39 | asm volatile ("fcvt.w.s %0, %1" : "=r" (i) : "f" (x)); |
40 | asm volatile ("fcvt.s.w %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 = copysignf (new_x, x); |
45 | |
46 | riscv_setflags (flags); |
47 | } |
48 | |
49 | return x; |
50 | } |
51 | |
52 | libm_alias_float (__nearbyint, nearbyint) |
53 | |