s_isinf.c

#include "SDL_internal.h"
/*
 * Written by J.T. Conklin <[email protected]>.
 * Changed to return -1 for -Inf by Ulrich Drepper <[email protected]>.
 * Public domain.
 */

/*
 * isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
 * no branching!
 */

#include "math.h"
#include "math_private.h"

int __isinf(double x)
{
	int32_t hx,lx;
	EXTRACT_WORDS(hx,lx,x);
	lx |= (hx & 0x7fffffff) ^ 0x7ff00000;
	lx |= -lx;
	return ~(lx >> 31) & (hx >> 30);
}
libm_hidden_def(__isinf)