blob: 730aa4d8d1eba383543fddee8e00f3826e70d523 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Change for long double by Jakub Jelinek <jj@ultra.linux.cz>
* Public domain.
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif
/*
* isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0;
* no branching!
* slightly dodgy in relying on signed shift right copying sign bit
*/
#include <math.h>
#include <math_private.h>
#include <math_ldbl_opt.h>
int
___isinfl (long double x)
{
double xhi;
int64_t hx, mask;
xhi = ldbl_high (x);
EXTRACT_WORDS64 (hx, xhi);
mask = (hx & 0x7fffffffffffffffLL) ^ 0x7ff0000000000000LL;
mask |= -mask;
mask >>= 63;
return ~mask & (hx >> 62);
}
hidden_ver (___isinfl, __isinfl)
#if !IS_IN (libm)
weak_alias (___isinfl, ____isinfl)
long_double_symbol (libc, ___isinfl, isinfl);
long_double_symbol (libc, ____isinfl, __isinfl);
#endif
|
