fegetenv.c 1.2 KB

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  1. /* Store current floating-point environment.
  2. Copyright (C) 1997,1999,2000,2001,2003 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, see
  15. <http://www.gnu.org/licenses/>. */
  16. #include <fenv.h>
  17. int
  18. fegetenv (fenv_t *envp)
  19. {
  20. __asm__ ("fnstenv %0" : "=m" (*envp));
  21. /* And load it right back since the processor changes the mask.
  22. Intel thought this opcode to be used in interrupt handlers which
  23. would block all exceptions. */
  24. __asm__ ("fldenv %0" : : "m" (*envp));
  25. /* Success. */
  26. return 0;
  27. }