fsub.c 869 B

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <linux/types.h>
  3. #include <linux/errno.h>
  4. #include <linux/uaccess.h>
  5. #include <asm/sfp-machine.h>
  6. #include <math-emu/soft-fp.h>
  7. #include <math-emu/double.h>
  8. int
  9. fsub(void *frD, void *frA, void *frB)
  10. {
  11. FP_DECL_D(A);
  12. FP_DECL_D(B);
  13. FP_DECL_D(R);
  14. FP_DECL_EX;
  15. #ifdef DEBUG
  16. printk("%s: %p %p %p\n", __func__, frD, frA, frB);
  17. #endif
  18. FP_UNPACK_DP(A, frA);
  19. FP_UNPACK_DP(B, frB);
  20. #ifdef DEBUG
  21. printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  22. printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  23. #endif
  24. if (B_c != FP_CLS_NAN)
  25. B_s ^= 1;
  26. if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  27. FP_SET_EXCEPTION(EFLAG_VXISI);
  28. FP_ADD_D(R, A, B);
  29. #ifdef DEBUG
  30. printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  31. #endif
  32. __FP_PACK_D(frD, R);
  33. return FP_CUR_EXCEPTIONS;
  34. }