fesetround.c 1.3 KB

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  1. /* Set current rounding direction.
  2. Copyright (C) 2013 Imagination Technologies Ltd.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <fenv.h>
  17. #include <unistd.h>
  18. int
  19. fesetround (int round)
  20. {
  21. unsigned int txmode;
  22. if ((round & ~0x3) != 0)
  23. /* ROUND is no valid rounding mode. */
  24. return 1;
  25. __asm__ ("MOV %0,TXMODE" : "=r" (txmode));
  26. txmode &= ~(0x3 << 16);
  27. /* Write rounding mode and guard bit. */
  28. txmode |= (0x1 << 18 ) | (round << 16);
  29. __asm__ ("MOV TXMODE,%0" : : "r" (txmode));
  30. return 0;
  31. }