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

   1 /* $Id: fnmsubs.c,v 1.1 1999/08/23 18:59:54 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 fnmsubs(void *frD, void *frA, void *frB, void *frC)
  14 {
  15         FP_DECL_D(R);
  16         FP_DECL_D(A);
  17         FP_DECL_D(B);
  18         FP_DECL_D(C);
  19         FP_DECL_D(T);
  20         int ret = 0;
  21
  22 #ifdef DEBUG
  23         printk("%s: %p %p %p %p\n", __FUNCTION__, frD, frA, frB, frC);
  24 #endif
  25
  26         __FP_UNPACK_D(A, frA);
  27         __FP_UNPACK_D(B, frB);
  28         __FP_UNPACK_D(C, frC);
  29
  30 #ifdef DEBUG
  31         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  32         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  33         printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
  34 #endif
  35
  36         if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
  37             (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
  38                 ret |= EFLAG_VXIMZ;
  39
  40         FP_MUL_D(T, A, C);
  41
  42         if (B_c != FP_CLS_NAN)
  43                 B_s ^= 1;
  44
  45         if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  46                 ret |= EFLAG_VXISI;
  47
  48         FP_ADD_D(R, T, B);
  49
  50         if (R_c != FP_CLS_NAN)
  51                 R_s ^= 1;
  52
  53 #ifdef DEBUG
  54         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  55 #endif
  56
  57         return (ret | __FP_PACK_DS(frD, R));
  58 }