compiler/stdc/math/s_isinf.c

   1 /*
   2  * Written by J.T. Conklin <jtc@NetBSD.org>.
   3  * Public domain.
   4  */
   5
   6 #if defined(LIBM_SCCS) && !defined(lint)
   7 __RCSID("$NetBSD: s_isinf.c,v 1.6 2003/07/26 19:25:05 salo Exp $");
   8 #endif
   9
  10 /*
  11  * isinf(x) returns 1 is x is inf, else 0;
  12  * no branching!
  13  */
  14
  15 #include "math.h"
  16 #include "math_private.h"
  17
  18 int
  19 __isinf(double x)
  20 {
  21         int32_t hx,lx;
  22         EXTRACT_WORDS(hx,lx,x);
  23         hx &= 0x7fffffff;
  24         hx ^= 0x7ff00000;
  25         hx |= lx;
  26         return (hx == 0);
  27 }