| /* |
| * 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) |
| #ifndef IS_IN_libm |
| weak_alias (___isinfl, ____isinfl) |
| long_double_symbol (libc, ___isinfl, isinfl); |
| long_double_symbol (libc, ____isinfl, __isinfl); |
| #endif |
