arch/powerpc/math-emu/fsub.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 fsub(void *frD, void *frA, void *frB)
  10 {
  11         FP_DECL_D(A);
  12         FP_DECL_D(B);
  13         FP_DECL_D(R);
  14         int ret = 0;
  15
  16 #ifdef DEBUG
  17         printk("%s: %p %p %p\n", __func__, frD, frA, frB);
  18 #endif
  19
  20         __FP_UNPACK_D(A, frA);
  21         __FP_UNPACK_D(B, frB);
  22
  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 #endif
  27
  28         if (B_c != FP_CLS_NAN)
  29                 B_s ^= 1;
  30
  31         if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  32                 ret |= EFLAG_VXISI;
  33
  34         FP_ADD_D(R, A, B);
  35
  36 #ifdef DEBUG
  37         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  38 #endif
  39
  40         return (ret | __FP_PACK_D(frD, R));
  41 }