fmsub.c 1.1 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455
  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. fmsub(void *frD, void *frA, void *frB, void *frC)
  10. {
  11. FP_DECL_D(R);
  12. FP_DECL_D(A);
  13. FP_DECL_D(B);
  14. FP_DECL_D(C);
  15. FP_DECL_D(T);
  16. FP_DECL_EX;
  17. #ifdef DEBUG
  18. printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
  19. #endif
  20. FP_UNPACK_DP(A, frA);
  21. FP_UNPACK_DP(B, frB);
  22. FP_UNPACK_DP(C, frC);
  23. #ifdef DEBUG
  24. printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  25. printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  26. printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
  27. #endif
  28. if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
  29. (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
  30. FP_SET_EXCEPTION(EFLAG_VXIMZ);
  31. FP_MUL_D(T, A, C);
  32. if (B_c != FP_CLS_NAN)
  33. B_s ^= 1;
  34. if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  35. FP_SET_EXCEPTION(EFLAG_VXISI);
  36. FP_ADD_D(R, T, B);
  37. #ifdef DEBUG
  38. printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  39. #endif
  40. __FP_PACK_D(frD, R);
  41. return FP_CUR_EXCEPTIONS;
  42. }