LXR linux/arch/sparc/include/asm/sfp-machine

   1/* Machine-dependent software floating-point definitions.
   2   Sparc64 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 (jj@ultra.linux.cz) 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_norm(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 << 1) - 1)
  44#define _FP_NANFRAC_D           ((_FP_QNANBIT_D << 1) - 1)
  45#define _FP_NANFRAC_Q           ((_FP_QNANBIT_Q << 1) - 1), -1
  46#define _FP_NANSIGN_S           0
  47#define _FP_NANSIGN_D           0
  48#define _FP_NANSIGN_Q           0
  49
  50#define _FP_KEEPNANFRACP 1
  51
  52/* If one NaN is signaling and the other is not,
  53 * we choose that one, otherwise we choose X.
  54 */
  55/* For _Qp_* and _Q_*, this should prefer X, for
  56 * CPU instruction emulation this should prefer Y.
  57 * (see SPAMv9 B.2.2 section).
  58 */
  59#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  60  do {                                                          \
  61    if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)          \
  62        && !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs))     \
  63      {                                                         \
  64        R##_s = X##_s;                                          \
  65        _FP_FRAC_COPY_##wc(R,X);                                \
  66      }                                                         \
  67    else                                                        \
  68      {                                                         \
  69        R##_s = Y##_s;                                          \
  70        _FP_FRAC_COPY_##wc(R,Y);                                \
  71      }                                                         \
  72    R##_c = FP_CLS_NAN;                                         \
  73  } while (0)
  74
  75/* Obtain the current rounding mode. */
  76#ifndef FP_ROUNDMODE
  77#define FP_ROUNDMODE    ((current_thread_info()->xfsr[0] >> 30) & 0x3)
  78#endif
  79
  80/* Exception flags. */
  81#define FP_EX_INVALID           (1 << 4)
  82#define FP_EX_OVERFLOW          (1 << 3)
  83#define FP_EX_UNDERFLOW         (1 << 2)
  84#define FP_EX_DIVZERO           (1 << 1)
  85#define FP_EX_INEXACT           (1 << 0)
  86
  87#define FP_HANDLE_EXCEPTIONS return _fex
  88
  89#define FP_INHIBIT_RESULTS ((current_thread_info()->xfsr[0] >> 23) & _fex)
  90
  91#define FP_TRAPPING_EXCEPTIONS ((current_thread_info()->xfsr[0] >> 23) & 0x1f)
  92
  93#endif
  94