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

   1 /* $Id: fnmsub.c,v 1.1 1999/08/23 18:59:53 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 fnmsub(void *frD, void *frA, void *frB, void *frC)
  13 {
  14         FP_DECL_D(R);
  15         FP_DECL_D(A);
  16         FP_DECL_D(B);
  17         FP_DECL_D(C);
  18         FP_DECL_D(T);
  19         int ret = 0;
  20
  21 #ifdef DEBUG
  22         printk("%s: %p %p %p %p\n", __FUNCTION__, frD, frA, frB, frC);
  23 #endif
  24
  25         __FP_UNPACK_D(A, frA);
  26         __FP_UNPACK_D(B, frB);
  27         __FP_UNPACK_D(C, frC);
  28
  29 #ifdef DEBUG
  30         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  31         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  32         printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
  33 #endif
  34
  35         if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
  36             (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
  37                 ret |= EFLAG_VXIMZ;
  38
  39         FP_MUL_D(T, A, C);
  40
  41         if (B_c != FP_CLS_NAN)
  42                 B_s ^= 1;
  43
  44         if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  45                 ret |= EFLAG_VXISI;
  46
  47         FP_ADD_D(R, T, B);
  48
  49         if (R_c != FP_CLS_NAN)
  50                 R_s ^= 1;
  51
  52 #ifdef DEBUG
  53         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  54 #endif
  55
  56         return (ret | __FP_PACK_D(frD, R));
  57 }