arch/powerpc/math-emu/fnmsub.c

   1 #include <linux/types.h>
   2 #include <linux/errno.h>
   3 #include <asm/uaccess.h>
   4
   5 #include "soft-fp.h"
   6 #include "double.h"
   7
   8 int
   9 fnmsub(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         int ret = 0;
  17
  18 #ifdef DEBUG
  19         printk("%s: %p %p %p %p\n", __FUNCTION__, frD, frA, frB, frC);
  20 #endif
  21
  22         __FP_UNPACK_D(A, frA);
  23         __FP_UNPACK_D(B, frB);
  24         __FP_UNPACK_D(C, frC);
  25
  26 #ifdef DEBUG
  27         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  28         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  29         printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
  30 #endif
  31
  32         if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
  33             (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
  34                 ret |= EFLAG_VXIMZ;
  35
  36         FP_MUL_D(T, A, C);
  37
  38         if (B_c != FP_CLS_NAN)
  39                 B_s ^= 1;
  40
  41         if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  42                 ret |= EFLAG_VXISI;
  43
  44         FP_ADD_D(R, T, B);
  45
  46         if (R_c != FP_CLS_NAN)
  47                 R_s ^= 1;
  48
  49 #ifdef DEBUG
  50         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  51 #endif
  52
  53         return (ret | __FP_PACK_D(frD, R));
  54 }