sysdeps/ieee754/ldbl-128ibm/s_isinfl.c

   1 /*
   2  * Written by J.T. Conklin <jtc@netbsd.org>.
   3  * Change for long double by Jakub Jelinek <jj@ultra.linux.cz>
   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 #include <math_ldbl_opt.h>
  19
  20 int
  21 ___isinfl (long double x)
  22 {
  23         int64_t hx,lx;
  24         GET_LDOUBLE_WORDS64(hx,lx,x);
  25         lx = (lx & 0x7fffffffffffffffLL);
  26         lx |= (hx & 0x7fffffffffffffffLL) ^ 0x7ff0000000000000LL;
  27         lx |= -lx;
  28         return ~(lx >> 63) & (hx >> 62);
  29 }
  30 hidden_ver (___isinfl, __isinfl)
  31 #ifndef IS_IN_libm
  32 weak_alias (___isinfl, ____isinfl)
  33 long_double_symbol (libc, ___isinfl, isinfl);
  34 long_double_symbol (libc, ____isinfl, __isinfl);
  35 #endif