33 lines
587 B
C
33 lines
587 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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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: s_isinff.c,v 1.3 1995/05/11 23:20:21 jtc Exp $";
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#endif
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/*
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* isinff(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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#ifdef __STDC__
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int __isinff(float x)
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#else
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int __isinff(x)
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float x;
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#endif
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{
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int32_t ix,t;
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GET_FLOAT_WORD(ix,x);
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t = ix & 0x7fffffff;
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t ^= 0x7f800000;
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t |= -t;
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return ~(t >> 31) & (1 - ((ix & 0x80000000) >> 30));
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}
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weak_alias (__isinff, isinff)
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