1/*
2 * Written by J.T. Conklin <jtc@netbsd.org>.
3 * Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
4 * Public domain.
5 */
6
7/*
8 * isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
9 * no branching!
10 */
11
12#include <math.h>
13#include <math_private.h>
14#include <shlib-compat.h>
15
16int
17__isinf (double x)
18{
19 int64_t ix;
20 EXTRACT_WORDS64(ix,x);
21 int64_t t = ix & UINT64_C(0x7fffffffffffffff);
22 t ^= UINT64_C(0x7ff0000000000000);
23 t |= -t;
24 return ~(t >> 63) & (ix >> 62);
25}
26hidden_def (__isinf)
27weak_alias (__isinf, isinf)
28#ifdef NO_LONG_DOUBLE
29# if defined LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
30compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
31# endif
32weak_alias (__isinf, isinfl)
33#endif
34