26 lines
716 B
C
26 lines
716 B
C
/* Copyright (C) 2015 by Red Hat, Incorporated. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software
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* is freely granted, provided that this notice is preserved.
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*/
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/* finitel(x) returns 1 is x is finite, else 0; */
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#include <math.h>
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int
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finitel (long double x)
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{
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#ifdef _LDBL_EQ_DBL
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return finite (x);
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#else
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/* Let the compiler do this for us.
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Note - we do not know how many bits there are in a long double.
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Some architectures for example have an 80-bit long double whereas
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others use 128-bits. We use macros and comiler builtin functions
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to avoid specific knowledge of the long double format. */
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return __builtin_isinf_sign (x) == 0;
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#endif
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}
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