29 lines
457 B
C
29 lines
457 B
C
/*
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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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#include <sys/cdefs.h>
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#if defined(LIBM_SCCS) && !defined(lint)
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__RCSID("$NetBSD: s_isinf.c,v 1.6 2003/07/26 19:25:05 salo 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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int
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isinf(double x)
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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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