| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 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 <features.h> |
| 18 | /* Prevent math.h from defining a colliding inline */ |
| 19 | #undef __USE_EXTERN_INLINES |
| 20 | #include "math.h" |
| 21 | #include "math_private.h" |
| 22 | |
| 23 | int __finite(double x) |
| 24 | { |
| 25 | u_int32_t hx; |
| 26 | |
| 27 | GET_HIGH_WORD(hx, x); |
| 28 | /* Finite numbers have at least one zero bit in exponent. */ |
| 29 | /* All other numbers will result in 0xffffffff after OR: */ |
| 30 | return (hx | 0x800fffff) != 0xffffffff; |
| 31 | } |
| 32 | libm_hidden_def(__finite) |