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1/* Copyright (C) 2000-2019 Free Software Foundation, Inc.
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
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
18
19#define NO_MATH_REDIRECT
20#include <math.h>
21#include <libm-alias-float.h>
22
23
24float
25__rintf (float x)
26{
27 if (isnanf (x))
28 return x + x;
29
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"
40 "cvttq/svid %2,%1\n\t"
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;
50}
51
52libm_alias_float (__rint, rint)
53

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