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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> |
f433d0b3 | 21 | #include <libm-alias-float.h> |
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22 | |
23 | ||
24 | float | |
25 | __rintf (float x) | |
26 | { | |
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27 | if (isnanf (x)) |
28 | return x + x; | |
29 | ||
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30 | if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */ |
31 | { | |
32 | /* Note that Alpha S_Floating is stored in registers in a | |
33 | restricted T_Floating format, so we don't even need to | |
34 | convert back to S_Floating in the end. The initial | |
35 | conversion to T_Floating is needed to handle denormals. */ | |
36 | ||
37 | float tmp1, tmp2, new_x; | |
38 | ||
39 | __asm ("cvtst/s %3,%2\n\t" | |
116ff9ad | 40 | "cvttq/svid %2,%1\n\t" |
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41 | "cvtqt/d %1,%0\n\t" |
42 | : "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2) | |
43 | : "f"(x)); | |
44 | ||
45 | /* rint(-0.1) == -0, and in general we'll always have the same | |
46 | sign as our input. */ | |
47 | x = copysignf(new_x, x); | |
48 | } | |
49 | return x; | |
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50 | } |
51 | ||
f433d0b3 | 52 | libm_alias_float (__rint, rint) |