]> git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/alpha/fpu/s_rintf.c
Update copyright dates with scripts/update-copyrights.
[thirdparty/glibc.git] / sysdeps / alpha / fpu / s_rintf.c
1 /* Copyright (C) 2000-2015 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 #include <math.h>
20
21
22 float
23 __rintf (float x)
24 {
25 if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */
26 {
27 /* Note that Alpha S_Floating is stored in registers in a
28 restricted T_Floating format, so we don't even need to
29 convert back to S_Floating in the end. The initial
30 conversion to T_Floating is needed to handle denormals. */
31
32 float tmp1, tmp2, new_x;
33
34 __asm ("cvtst/s %3,%2\n\t"
35 "cvttq/svid %2,%1\n\t"
36 "cvtqt/d %1,%0\n\t"
37 : "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2)
38 : "f"(x));
39
40 /* rint(-0.1) == -0, and in general we'll always have the same
41 sign as our input. */
42 x = copysignf(new_x, x);
43 }
44 return x;
45 }
46
47 weak_alias (__rintf, rintf)