]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/powerpc/powerpc32/fpu/s_llroundf.c
1 /* Round float value to long long int.
2 Copyright (C) 1997-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <https://www.gnu.org/licenses/>. */
20 #include <math_private.h>
22 #include <libm-alias-float.h>
24 /* Round to the nearest integer, with values exactly on a 0.5 boundary
25 rounded away from zero, regardless of the current rounding mode.
26 If (long long)x, when x is out of range of a long long, clips at
27 LLONG_MAX or LLONG_MIN, then this implementation also clips. */
38 /* Avoid incorrect exceptions from libgcc conversions (as of GCC
39 5): <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59412>. */
41 xr
= (long long int) (long int) x
;
42 else if (!(ax
< 0x1p
55f
))
43 xr
= (long long int) (long int) (x
* 0x1p
-32f
) << 32;
47 GET_FLOAT_WORD (i0
, x
);
48 int exponent
= ((i0
>> 23) & 0xff) - 0x7f;
49 unsigned long long int mant
= (i0
& 0x7fffff) | 0x800000;
50 mant
<<= exponent
- 23;
51 xr
= (long long int) ((i0
& 0x80000000) != 0 ? -mant
: mant
);
54 /* Avoid spurious "inexact" converting LLONG_MAX to float, and from
55 subtraction when the result is out of range, by returning early
56 for arguments large enough that no rounding is needed. */
57 if (!(fabsf (x
) < 0x1p
23f
))
59 float xrf
= (float) xr
;
64 xr
+= (long long) ((unsigned long long) xr
+ 1) > 0;
69 xr
-= (long long) ((unsigned long long) xr
- 1) < 0;
73 libm_alias_float (__llround
, llround
)