| /* |
| * Written by J.T. Conklin <jtc@netbsd.org>. |
| * Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>. |
| * Public domain. |
| */ |
| |
| /* |
| * isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0; |
| * no branching! |
| */ |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| int |
| __isinf (double x) |
| { |
| int64_t ix; |
| EXTRACT_WORDS64(ix,x); |
| int64_t t = ix & UINT64_C(0x7fffffffffffffff); |
| t ^= UINT64_C(0x7ff0000000000000); |
| t |= -t; |
| return ~(t >> 63) & (ix >> 62); |
| } |
| hidden_def (__isinf) |
| weak_alias (__isinf, isinf) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__isinf, __isinfl) |
| weak_alias (__isinf, isinfl) |
| #endif |
