ftestexcept.c 1.3 KB

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  1. /* Test exception in current environment.
  2. Copyright (C) 1997, 2003, 2004 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 <fenv.h>
  18. #include <unistd.h>
  19. int
  20. fetestexcept (int excepts)
  21. {
  22. short temp;
  23. int xtemp = 0;
  24. /* Get current exceptions. */
  25. __asm__ ("fnstsw %0" : "=a" (temp));
  26. #if 0
  27. /* If the CPU supports SSE we test the MXCSR as well. */
  28. if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
  29. __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
  30. #endif
  31. return (temp | xtemp) & excepts & FE_ALL_EXCEPT;
  32. }