qp_cmp.c 1.5 KB

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  1. /* Software floating-point emulation.
  2. Compare (*a) and (*b), return float condition code.
  3. Copyright (C) 1997-2017 Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. Contributed by Richard Henderson (rth@cygnus.com) and
  6. Jakub Jelinek (jj@ultra.linux.cz).
  7. The GNU C Library is free software; you can redistribute it and/or
  8. modify it under the terms of the GNU Lesser General Public
  9. License as published by the Free Software Foundation; either
  10. version 2.1 of the License, or (at your option) any later version.
  11. The GNU C Library is distributed in the hope that it will be useful,
  12. but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14. Lesser General Public License for more details.
  15. You should have received a copy of the GNU Lesser General Public
  16. License along with the GNU C Library; if not, see
  17. <http://www.gnu.org/licenses/>. */
  18. #include "soft-fp.h"
  19. #include "quad.h"
  20. int _Qp_cmp(const long double *a, const long double *b)
  21. {
  22. FP_DECL_EX;
  23. FP_DECL_Q(A); FP_DECL_Q(B);
  24. int r;
  25. FP_INIT_ROUNDMODE;
  26. FP_UNPACK_RAW_QP(A, a);
  27. FP_UNPACK_RAW_QP(B, b);
  28. FP_CMP_Q(r, B, A, 3, 1);
  29. if (r == -1) r = 2;
  30. QP_HANDLE_EXCEPTIONS(
  31. __asm (
  32. " ldd [%0], %%f52\n"
  33. " ldd [%0+8], %%f54\n"
  34. " ldd [%1], %%f56\n"
  35. " ldd [%1+8], %%f58\n"
  36. " fcmpq %%fcc3, %%f52, %%f56\n"
  37. " " : : "r" (a), "r" (b) : QP_CLOBBER_CC);
  38. _FPU_GETCW(_fcw);
  39. r = ((_fcw >> 36) & 3));
  40. return r;
  41. }