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d4697bc9 | 1 | /* Copyright (C) 2000-2014 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 | |
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 | |
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16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <math.h> | |
20 | #include <math_ldbl_opt.h> | |
21 | ||
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22 | |
23 | double | |
24 | __nearbyint (double x) | |
25 | { | |
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26 | if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */ |
27 | { | |
28 | double tmp1, new_x; | |
29 | __asm ("cvttq/svd %2,%1\n\t" | |
30 | "cvtqt/d %1,%0\n\t" | |
31 | : "=f"(new_x), "=&f"(tmp1) | |
32 | : "f"(x)); | |
33 | ||
34 | /* nearbyint(-0.1) == -0, and in general we'll always have the same | |
35 | sign as our input. */ | |
36 | x = copysign(new_x, x); | |
37 | } | |
38 | return x; | |
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39 | } |
40 | ||
41 | weak_alias (__nearbyint, nearbyint) | |
42 | #ifdef NO_LONG_DOUBLE | |
43 | strong_alias (__nearbyint, __nearbyintl) | |
44 | weak_alias (__nearbyint, nearbyintl) | |
45 | #endif | |
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46 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) |
47 | compat_symbol (libm, __nearbyint, nearbyintl, GLIBC_2_1); | |
bebc4903 | 48 | #endif |