err.no Git - linux-2.6/blob - arch/alpha/include/asm/sfp-machine.h

   1 /* Machine-dependent software floating-point definitions.
   2    Alpha kernel version.
   3    Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Richard Henderson (rth@cygnus.com),
   6                   Jakub Jelinek (jakub@redhat.com) and
   7                   David S. Miller (davem@redhat.com).
   8
   9    The GNU C Library is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU Library General Public License as
  11    published by the Free Software Foundation; either version 2 of the
  12    License, or (at your option) any later version.
  13
  14    The GNU C Library is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    Library General Public License for more details.
  18
  19    You should have received a copy of the GNU Library General Public
  20    License along with the GNU C Library; see the file COPYING.LIB.  If
  21    not, write to the Free Software Foundation, Inc.,
  22    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 #ifndef _SFP_MACHINE_H
  25 #define _SFP_MACHINE_H
  26
  27 #define _FP_W_TYPE_SIZE         64
  28 #define _FP_W_TYPE              unsigned long
  29 #define _FP_WS_TYPE             signed long
  30 #define _FP_I_TYPE              long
  31
  32 #define _FP_MUL_MEAT_S(R,X,Y)                                   \
  33   _FP_MUL_MEAT_1_imm(_FP_WFRACBITS_S,R,X,Y)
  34 #define _FP_MUL_MEAT_D(R,X,Y)                                   \
  35   _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
  36 #define _FP_MUL_MEAT_Q(R,X,Y)                                   \
  37   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
  38
  39 #define _FP_DIV_MEAT_S(R,X,Y)   _FP_DIV_MEAT_1_imm(S,R,X,Y,_FP_DIV_HELP_imm)
  40 #define _FP_DIV_MEAT_D(R,X,Y)   _FP_DIV_MEAT_1_udiv(D,R,X,Y)
  41 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_2_udiv(Q,R,X,Y)
  42
  43 #define _FP_NANFRAC_S           _FP_QNANBIT_S
  44 #define _FP_NANFRAC_D           _FP_QNANBIT_D
  45 #define _FP_NANFRAC_Q           _FP_QNANBIT_Q
  46 #define _FP_NANSIGN_S           1
  47 #define _FP_NANSIGN_D           1
  48 #define _FP_NANSIGN_Q           1
  49
  50 #define _FP_KEEPNANFRACP 1
  51
  52 /* Alpha Architecture Handbook, 4.7.10.4 sais that
  53  * we should prefer any type of NaN in Fb, then Fa.
  54  */
  55 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  56   do {                                                          \
  57     R##_s = Y##_s;                                              \
  58     _FP_FRAC_COPY_##wc(R,X);                                    \
  59     R##_c = FP_CLS_NAN;                                         \
  60   } while (0)
  61
  62 /* Obtain the current rounding mode. */
  63 #define FP_ROUNDMODE    mode
  64 #define FP_RND_NEAREST  (FPCR_DYN_NORMAL >> FPCR_DYN_SHIFT)
  65 #define FP_RND_ZERO     (FPCR_DYN_CHOPPED >> FPCR_DYN_SHIFT)
  66 #define FP_RND_PINF     (FPCR_DYN_PLUS >> FPCR_DYN_SHIFT)
  67 #define FP_RND_MINF     (FPCR_DYN_MINUS >> FPCR_DYN_SHIFT)
  68
  69 /* Exception flags. */
  70 #define FP_EX_INVALID           IEEE_TRAP_ENABLE_INV
  71 #define FP_EX_OVERFLOW          IEEE_TRAP_ENABLE_OVF
  72 #define FP_EX_UNDERFLOW         IEEE_TRAP_ENABLE_UNF
  73 #define FP_EX_DIVZERO           IEEE_TRAP_ENABLE_DZE
  74 #define FP_EX_INEXACT           IEEE_TRAP_ENABLE_INE
  75 #define FP_EX_DENORM            IEEE_TRAP_ENABLE_DNO
  76
  77 #define FP_DENORM_ZERO          (swcr & IEEE_MAP_DMZ)
  78
  79 /* We write the results always */
  80 #define FP_INHIBIT_RESULTS 0
  81
  82 #endif