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/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
 * Public domain.
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:20:14 jtc Exp $";
#endif

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

#include <math.h>
#include <math_private.h>
#include <ldbl-classify-compat.h>
#include <shlib-compat.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);
}
hidden_def (__isinf)
weak_alias (__isinf, isinf)
#ifdef NO_LONG_DOUBLE
# if LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
# endif
weak_alias (__isinf, isinfl)
#endif