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33 lines
770 B
C
33 lines
770 B
C
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Change for long double by Ulrich Drepper <drepper@cygnus.com>.
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* Intel i387 specific version.
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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: $";
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#endif
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/*
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* isinfl(x) returns 1 if 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 __isinfl(long double x)
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{
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int32_t se,hx,lx;
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GET_LDOUBLE_WORDS(se,hx,lx,x);
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/* This additional ^ 0x80000000 is necessary because in Intel's
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internal representation of the implicit one is explicit. */
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lx |= (hx ^ 0x80000000) | ((se & 0x7fff) ^ 0x7fff);
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lx |= -lx;
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se &= 0x8000;
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return ~(lx >> 31) & (1 - (se >> 14));
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}
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hidden_def (__isinfl)
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weak_alias (__isinfl, isinfl)
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