sysdeps/ieee754/ldbl-96/s_isinfl.c

   1 /*
   2  * Written by J.T. Conklin <jtc@netbsd.org>.
   3  * Change for long double by Ulrich Drepper <drepper@cygnus.com>.
   4  * Public domain.
   5  */
   6
   7 #if defined(LIBM_SCCS) && !defined(lint)
   8 static char rcsid[] = "$NetBSD: $";
   9 #endif
  10
  11 /*
  12  * isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0;
  13  * no branching!
  14  */
  15
  16 #include "math.h"
  17 #include "math_private.h"
  18
  19 int
  20 __isinfl (long double x)
  21 {
  22         int32_t se,hx,lx;
  23         GET_LDOUBLE_WORDS(se,hx,lx,x);
  24         lx |= (hx & 0x7fffffff) | ((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)