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25 lines
477 B
C
25 lines
477 B
C
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#include "SDL_internal.h"
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/*
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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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/*
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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 __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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libm_hidden_def(__isinf)
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