1 | /* |
2 | * ==================================================== |
3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
4 | * |
5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
6 | * Permission to use, copy, modify, and distribute this |
7 | * software is freely granted, provided that this notice |
8 | * is preserved. |
9 | * ==================================================== |
10 | */ |
11 | |
12 | /* |
13 | * finite(x) returns 1 is x is finite, else 0; |
14 | * no branching! |
15 | */ |
16 | |
17 | #include <math.h> |
18 | #include <math_private.h> |
19 | #include <ldbl-classify-compat.h> |
20 | #include <shlib-compat.h> |
21 | #include <stdint.h> |
22 | |
23 | int |
24 | __finite (double x) |
25 | { |
26 | int64_t lx; |
27 | EXTRACT_WORDS64 (lx,x); |
28 | return (int)((uint64_t)((lx & INT64_C(0x7ff0000000000000)) |
29 | - INT64_C (0x7ff0000000000000)) >> 63); |
30 | } |
31 | hidden_def (__finite) |
32 | weak_alias (__finite, finite) |
33 | #ifdef NO_LONG_DOUBLE |
34 | # if LDBL_CLASSIFY_COMPAT |
35 | # if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23) |
36 | compat_symbol (libc, __finite, __finitel, GLIBC_2_0); |
37 | # endif |
38 | # if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_23) |
39 | compat_symbol (libm, __finite, __finitel, GLIBC_2_1); |
40 | # endif |
41 | # endif |
42 | weak_alias (__finite, finitel) |
43 | #endif |
44 | |