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b2cb5e02 | 1 | /* rintf(). RISC-V version. |
d614a753 | 2 | Copyright (C) 2017-2020 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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
b2cb5e02 | 18 | |
f29b6f17 | 19 | #define NO_MATH_REDIRECT |
b2cb5e02 | 20 | #include <math.h> |
c52944e8 | 21 | #include <stdbool.h> |
b2cb5e02 PD |
22 | #include <libm-alias-float.h> |
23 | #include <stdint.h> | |
24 | ||
25 | float | |
26 | __rintf (float x) | |
27 | { | |
28 | bool nan; | |
29 | float mag; | |
30 | ||
31 | nan = isnan (x); | |
32 | mag = fabsf (x); | |
33 | ||
34 | if (nan) | |
35 | return x + x; | |
36 | ||
37 | if (mag < (1 << __FLT_MANT_DIG__)) | |
38 | { | |
39 | int32_t i; | |
40 | float new_x; | |
41 | ||
42 | asm ("fcvt.w.s %0, %1" : "=r" (i) : "f" (x)); | |
43 | asm ("fcvt.s.w %0, %1" : "=f" (new_x) : "r" (i)); | |
44 | ||
45 | /* rint(-0) == -0, and in general we'll always have the same | |
46 | sign as our input. */ | |
47 | x = copysignf (new_x, x); | |
48 | } | |
49 | ||
50 | return x; | |
51 | } | |
52 | ||
53 | libm_alias_float (__rint, rint) |