1 /* rint().  RISC-V version.
2    Copyright (C) 2017-2022 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 #define NO_MATH_REDIRECT
20 #include <math.h>
21 #include <stdbool.h>
22 #include <libm-alias-double.h>
23 #include <stdint.h>
24 
25 double
__rint(double x)26 __rint (double x)
27 {
28   bool nan;
29   double mag;
30 
31   nan = isnan (x);
32   mag = fabs (x);
33 
34   if (nan)
35     return x + x;
36 
37   if (mag < (1ULL << __DBL_MANT_DIG__))
38     {
39       int64_t i;
40       double new_x;
41 
42       asm ("fcvt.l.d %0, %1" : "=r" (i) : "f" (x));
43       asm ("fcvt.d.l %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 = copysign (new_x, x);
48     }
49 
50   return x;
51 }
52 
53 libm_alias_double (__rint, rint)
54