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33 lines
533 B
C
33 lines
533 B
C
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/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:20:14 jtc Exp $";
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#endif
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/*
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* isinf(x) returns 1 is x is inf, else 0;
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* no branching!
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*/
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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int __isinf(double x)
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#else
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int __isinf(x)
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double x;
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#endif
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{
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int32_t hx,lx;
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EXTRACT_WORDS(hx,lx,x);
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hx &= 0x7fffffff;
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hx ^= 0x7ff00000;
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hx |= lx;
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return (hx == 0);
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}
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weak_alias (__isinf, isinf)
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