1  /*
       2   * Intel i387 specific version.
       3   * Public domain.
       4   */
       5  
       6  #if defined(LIBM_SCCS) && !defined(lint)
       7  static char rcsid[] = "$NetBSD: $";
       8  #endif
       9  
      10  /*
      11   * isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0;
      12   * no branching!
      13   */
      14  
      15  #include <math.h>
      16  #include <math_private.h>
      17  
      18  int __isinfl(long double x)
      19  {
      20  	int32_t se,hx,lx;
      21  	GET_LDOUBLE_WORDS(se,hx,lx,x);
      22  	/* This additional ^ 0x80000000 is necessary because in Intel's
      23  	   internal representation of the implicit one is explicit.  */
      24  	lx |= (hx ^ 0x80000000) | ((se & 0x7fff) ^ 0x7fff);
      25  	lx |= -lx;
      26  	se &= 0x8000;
      27  	return ~(lx >> 31) & (1 - (se >> 14));
      28  }
      29  hidden_def (__isinfl)
      30  weak_alias (__isinfl, isinfl)