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d4697bc9 | 1 | /* Copyright (C) 2007-2014 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 | ||
21 | ||
22 | float | |
23 | __roundf (float x) | |
24 | { | |
25 | const float almost_half = 0x1.fffffep-2; | |
26 | const float two23 = 0x1.0p23; | |
27 | float r, tmp; | |
5556231d | 28 | |
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29 | __asm ( |
30 | #ifdef _IEEE_FP_INEXACT | |
31 | "adds/suic %2, %3, %1\n\tsubs/suic %1, %3, %0" | |
32 | #else | |
33 | "adds/suc %2, %3, %1\n\tsubs/suc %1, %3, %0" | |
34 | #endif | |
35 | : "=&f"(r), "=&f"(tmp) | |
36 | : "f"(fabsf (x) + almost_half), "f"(two23)); | |
37 | ||
38 | /* round(-0) == -0, and in general we'll always have the same | |
39 | sign as our input. */ | |
40 | return copysignf (r, x); | |
41 | } | |
42 | ||
43 | weak_alias (__roundf, roundf) |