fsub.c 831 B

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  1. #include <linux/types.h>
  2. #include <linux/errno.h>
  3. #include <asm/uaccess.h>
  4. #include <asm/sfp-machine.h>
  5. #include <math-emu/soft-fp.h>
  6. #include <math-emu/double.h>
  7. int
  8. fsub(void *frD, void *frA, void *frB)
  9. {
  10. FP_DECL_D(A);
  11. FP_DECL_D(B);
  12. FP_DECL_D(R);
  13. FP_DECL_EX;
  14. #ifdef DEBUG
  15. printk("%s: %p %p %p\n", __func__, frD, frA, frB);
  16. #endif
  17. FP_UNPACK_DP(A, frA);
  18. FP_UNPACK_DP(B, frB);
  19. #ifdef DEBUG
  20. printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  21. printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  22. #endif
  23. if (B_c != FP_CLS_NAN)
  24. B_s ^= 1;
  25. if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  26. FP_SET_EXCEPTION(EFLAG_VXISI);
  27. FP_ADD_D(R, A, B);
  28. #ifdef DEBUG
  29. printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  30. #endif
  31. __FP_PACK_D(frD, R);
  32. return FP_CUR_EXCEPTIONS;
  33. }