arch/powerpc/math-emu/fnmsub.c

   1 #include <linux/types.h>
   2 #include <linux/errno.h>
   3 #include <linux/uaccess.h>
   4
   5 #include <asm/sfp-machine.h>
   6 #include <math-emu/soft-fp.h>
   7 #include <math-emu/double.h>
   8
   9 int
  10 fnmsub(void *frD, void *frA, void *frB, void *frC)
  11 {
  12         FP_DECL_D(R);
  13         FP_DECL_D(A);
  14         FP_DECL_D(B);
  15         FP_DECL_D(C);
  16         FP_DECL_D(T);
  17         FP_DECL_EX;
  18
  19 #ifdef DEBUG
  20         printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
  21 #endif
  22
  23         FP_UNPACK_DP(A, frA);
  24         FP_UNPACK_DP(B, frB);
  25         FP_UNPACK_DP(C, frC);
  26
  27 #ifdef DEBUG
  28         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  29         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  30         printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
  31 #endif
  32
  33         if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
  34             (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
  35                 FP_SET_EXCEPTION(EFLAG_VXIMZ);
  36
  37         FP_MUL_D(T, A, C);
  38
  39         if (B_c != FP_CLS_NAN)
  40                 B_s ^= 1;
  41
  42         if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  43                 FP_SET_EXCEPTION(EFLAG_VXISI);
  44
  45         FP_ADD_D(R, T, B);
  46
  47         if (R_c != FP_CLS_NAN)
  48                 R_s ^= 1;
  49
  50 #ifdef DEBUG
  51         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  52 #endif
  53
  54         __FP_PACK_D(frD, R);
  55
  56         return FP_CUR_EXCEPTIONS;
  57 }