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| [1] | 1 | |
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| 2 | /* @(#)s_finite.c 5.1 93/09/24 */ |
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| 3 | /* |
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| 4 | * ==================================================== |
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 6 | * |
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 8 | * Permission to use, copy, modify, and distribute this |
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| 9 | * software is freely granted, provided that this notice |
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| 10 | * is preserved. |
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| 11 | * ==================================================== |
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| 12 | */ |
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| 13 | |
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| 14 | /* |
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| 15 | * finite(x) returns 1 is x is finite, else 0; |
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| 16 | * no branching! |
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| 17 | */ |
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| 18 | |
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| 19 | #include <libm/fdlibm.h> |
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| 20 | |
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| 21 | #ifdef __STDC__ |
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| 22 | static const double one = 1.0; |
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| 23 | #else |
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| 24 | static double one = 1.0; |
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| 25 | #endif |
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| 26 | |
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| 27 | #ifdef __STDC__ |
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| 28 | int finite(double x) |
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| 29 | #else |
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| 30 | int finite(x) |
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| 31 | double x; |
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| 32 | #endif |
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| 33 | { |
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| 34 | int n0,hx; |
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| 35 | n0 = ((*(int*)&one)>>29)^1; |
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| 36 | hx = *(n0+(int*)&x); |
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| 37 | return (unsigned)((hx&0x7fffffff)-0x7ff00000)>>31; |
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| 38 | } |
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