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04277e02 | 1 | /* Copyright (C) 2000-2019 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by Richard Henderson. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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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. | |
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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 | |
3214b89b | 13 | Lesser General Public License for more details. |
9dc874df | 14 | |
3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff | 16 | License along with the GNU C Library. If not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
9dc874df | 18 | |
f29b6f17 | 19 | #define NO_MATH_REDIRECT |
9dc874df | 20 | #include <math.h> |
92ed9d7a | 21 | #include <math_ldbl_opt.h> |
5de60638 | 22 | #include <libm-alias-double.h> |
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23 | |
24 | ||
25 | double | |
26 | __rint (double x) | |
27 | { | |
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28 | if (isnan (x)) |
29 | return x + x; | |
30 | ||
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31 | if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */ |
32 | { | |
33 | double tmp1, new_x; | |
7fd8e5a4 | 34 | __asm ("cvttq/svid %2,%1\n\t" |
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35 | "cvtqt/d %1,%0\n\t" |
36 | : "=f"(new_x), "=&f"(tmp1) | |
37 | : "f"(x)); | |
38 | ||
39 | /* rint(-0.1) == -0, and in general we'll always have the same | |
40 | sign as our input. */ | |
41 | x = copysign(new_x, x); | |
42 | } | |
43 | return x; | |
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44 | } |
45 | ||
5de60638 | 46 | libm_alias_double (__rint, rint) |