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34 lines
696 B
C
34 lines
696 B
C
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
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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, -1 if 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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lx |= (hx & 0x7fffffff) ^ 0x7ff00000;
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lx |= -lx;
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return ~(lx >> 31) & (hx >> 30);
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}
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hidden_def (__isinf)
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weak_alias (__isinf, isinf)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__isinf, __isinfl)
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weak_alias (__isinf, isinfl)
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#endif
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