s_signbit.c 1.2 KB

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  1. /* Return nonzero value if number is negative.
  2. Copyright (C) 1997 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
  5. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Lesser General Public
  7. License as published by the Free Software Foundation; either
  8. version 2.1 of the License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; if not, write to the Free
  15. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  16. 02111-1307 USA. */
  17. #include <features.h>
  18. /* Prevent math.h from defining a colliding inline */
  19. #undef __USE_EXTERN_INLINES
  20. #include <math.h>
  21. #include "math_private.h"
  22. int
  23. __signbit (double x)
  24. {
  25. int32_t hx;
  26. GET_HIGH_WORD (hx, x);
  27. return hx & 0x80000000;
  28. }
  29. libm_hidden_def(__signbit)