i386/linux/linux-2.3.21/arch/ppc/math-emu/fsub.c

   1 /* $Id: fsub.c,v 1.1 1999/08/23 19:00:05 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
  11 int
  12 fsub(void *frD, void *frA, void *frB)
  13 {
  14         FP_DECL_D(A);
  15         FP_DECL_D(B);
  16         FP_DECL_D(R);
  17         int ret = 0;
  18
  19 #ifdef DEBUG
  20         printk("%s: %p %p %p\n", __FUNCTION__, frD, frA, frB);
  21 #endif
  22
  23         __FP_UNPACK_D(A, frA);
  24         __FP_UNPACK_D(B, frB);
  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 #endif
  30
  31         if (B_c != FP_CLS_NAN)
  32                 B_s ^= 1;
  33
  34         if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  35                 ret |= EFLAG_VXISI;
  36
  37         FP_ADD_D(R, A, B);
  38
  39 #ifdef DEBUG
  40         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  41 #endif
  42
  43         return (ret | __FP_PACK_D(frD, R));
  44 }