s_finite.c 839 B

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  1. /* @(#)s_finite.c 5.1 93/09/24 */
  2. /*
  3. * ====================================================
  4. * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  5. *
  6. * Developed at SunPro, a Sun Microsystems, Inc. business.
  7. * Permission to use, copy, modify, and distribute this
  8. * software is freely granted, provided that this notice
  9. * is preserved.
  10. * ====================================================
  11. */
  12. #if defined(LIBM_SCCS) && !defined(lint)
  13. static char rcsid[] = "$NetBSD: s_finite.c,v 1.8 1995/05/10 20:47:17 jtc Exp $";
  14. #endif
  15. /*
  16. * finite(x) returns 1 is x is finite, else 0;
  17. * no branching!
  18. */
  19. #include "math.h"
  20. #include "math_private.h"
  21. #ifdef __STDC__
  22. int finite(double x)
  23. #else
  24. int finite(x)
  25. double x;
  26. #endif
  27. {
  28. int32_t hx;
  29. GET_HIGH_WORD(hx,x);
  30. return (int)((u_int32_t)((hx&0x7fffffff)-0x7ff00000)>>31);
  31. }