fesetround.c 1.1 KB

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  1. /* Set current rounding direction.
  2. Copyright (C) 2004, 2006 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. Contributed by Aldy Hernandez <aldyh@redhat.com>, 2004.
  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, see
  15. <http://www.gnu.org/licenses/>. */
  16. #include "fenv_libc.h"
  17. int
  18. fesetround (int round)
  19. {
  20. unsigned long fpescr;
  21. if ((unsigned int) round > 3)
  22. return 1;
  23. fpescr = fegetenv_register ();
  24. fpescr = (fpescr & ~SPEFSCR_FRMC) | (round & 3);
  25. fesetenv_register (fpescr);
  26. return 0;
  27. }
  28. libm_hidden_def (fesetround)