1/* Truncate argument to nearest integral value not larger than the argument.
2 Copyright (C) 1997-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#define NO_MATH_REDIRECT
21#include <math.h>
22
23#include <math_private.h>
24#include <libm-alias-float.h>
25
26
27float
28__truncf (float x)
29{
30 int32_t i0, j0;
31 int sx;
32
33 GET_FLOAT_WORD (i0, x);
34 sx = i0 & 0x80000000;
35 j0 = ((i0 >> 23) & 0xff) - 0x7f;
36 if (j0 < 23)
37 {
38 if (j0 < 0)
39 /* The magnitude of the number is < 1 so the result is +-0. */
40 SET_FLOAT_WORD (x, sx);
41 else
42 SET_FLOAT_WORD (x, sx | (i0 & ~(0x007fffff >> j0)));
43 }
44 else
45 {
46 if (j0 == 0x80)
47 /* x is inf or NaN. */
48 return x + x;
49 }
50
51 return x;
52}
53#ifndef __truncf
54libm_alias_float (__trunc, trunc)
55#endif
56