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b2cb5e02 PD |
1 | /* floor(). RISC-V version. |
2 | Copyright (C) 2017-2018 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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
e44acb20 | 19 | #define NO_MATH_REDIRECT |
b2cb5e02 PD |
20 | #include <math.h> |
21 | #include <math_private.h> | |
70e2ba33 | 22 | #include <fenv_private.h> |
b2cb5e02 PD |
23 | #include <libm-alias-double.h> |
24 | #include <stdint.h> | |
25 | ||
26 | double | |
27 | __floor (double x) | |
28 | { | |
29 | int flags = riscv_getflags (); | |
30 | bool nan = isnan (x); | |
31 | double mag = fabs (x); | |
32 | ||
33 | if (nan) | |
34 | return x + x; | |
35 | ||
36 | if (mag < (1ULL << __DBL_MANT_DIG__)) | |
37 | { | |
38 | int64_t i; | |
39 | double new_x; | |
40 | ||
41 | asm volatile ("fcvt.l.d %0, %1, rdn" : "=r" (i) : "f" (x)); | |
42 | asm volatile ("fcvt.d.l %0, %1, rdn" : "=f" (new_x) : "r" (i)); | |
43 | ||
44 | /* floor(-0) == -0, and in general we'll always have the same | |
45 | sign as our input. */ | |
46 | x = copysign (new_x, x); | |
47 | ||
48 | riscv_setflags (flags); | |
49 | } | |
50 | ||
51 | return x; | |
52 | } | |
53 | ||
54 | libm_alias_double (__floor, floor) |