arch/ppc/math-emu/fsubs.c

   1 /* $Id: fsubs.c,v 1.1 1999/08/23 19:00:07 cort Exp $
   2  */
   3
   4 #include <linux/types.h>
   5 #include <linux/errno.h>
   6 #include <asm/uaccess.h>
   7
   8 #include "soft-fp.h"
   9 #include "double.h"
  10 #include "single.h"
  11
  12 int
  13 fsubs(void *frD, void *frA, void *frB)
  14 {
  15         FP_DECL_D(A);
  16         FP_DECL_D(B);
  17         FP_DECL_D(R);
  18         int ret = 0;
  19
  20 #ifdef DEBUG
  21         printk("%s: %p %p %p\n", __FUNCTION__, frD, frA, frB);
  22 #endif
  23
  24         __FP_UNPACK_D(A, frA);
  25         __FP_UNPACK_D(B, frB);
  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 #endif
  31
  32         if (B_c != FP_CLS_NAN)
  33                 B_s ^= 1;
  34
  35         if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  36                 ret |= EFLAG_VXISI;
  37
  38         FP_ADD_D(R, A, B);
  39
  40 #ifdef DEBUG
  41         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  42 #endif
  43
  44         return (ret | __FP_PACK_DS(frD, R));
  45 }