LXR linux/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
  83