linux/arch/s390/include/asm/sfp-machine.h
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   1/* Machine-dependent software floating-point definitions.
   2   S/390 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),
   7                  David S. Miller (davem@redhat.com) and
   8                  Peter Maydell (pmaydell@chiark.greenend.org.uk).
   9
  10   The GNU C Library is free software; you can redistribute it and/or
  11   modify it under the terms of the GNU Library General Public License as
  12   published by the Free Software Foundation; either version 2 of the
  13   License, or (at your option) any later version.
  14
  15   The GNU C Library is distributed in the hope that it will be useful,
  16   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18   Library General Public License for more details.
  19
  20   You should have received a copy of the GNU Library General Public
  21   License along with the GNU C Library; see the file COPYING.LIB.  If
  22   not, write to the Free Software Foundation, Inc.,
  23   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  24
  25#ifndef _SFP_MACHINE_H
  26#define _SFP_MACHINE_H
  27   
  28
  29#define _FP_W_TYPE_SIZE         32
  30#define _FP_W_TYPE              unsigned int
  31#define _FP_WS_TYPE             signed int
  32#define _FP_I_TYPE              int
  33
  34#define _FP_MUL_MEAT_S(R,X,Y)                                   \
  35  _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
  36#define _FP_MUL_MEAT_D(R,X,Y)                                   \
  37  _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
  38#define _FP_MUL_MEAT_Q(R,X,Y)                                   \
  39  _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
  40
  41#define _FP_DIV_MEAT_S(R,X,Y)   _FP_DIV_MEAT_1_udiv(S,R,X,Y)
  42#define _FP_DIV_MEAT_D(R,X,Y)   _FP_DIV_MEAT_2_udiv(D,R,X,Y)
  43#define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
  44
  45#define _FP_NANFRAC_S           ((_FP_QNANBIT_S << 1) - 1)
  46#define _FP_NANFRAC_D           ((_FP_QNANBIT_D << 1) - 1), -1
  47#define _FP_NANFRAC_Q           ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
  48#define _FP_NANSIGN_S           0
  49#define _FP_NANSIGN_D           0
  50#define _FP_NANSIGN_Q           0
  51
  52#define _FP_KEEPNANFRACP 1
  53
  54/*
  55 * If one NaN is signaling and the other is not,
  56 * we choose that one, otherwise we choose X.
  57 */
  58#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  59  do {                                                          \
  60    if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)          \
  61        && !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs))     \
  62      {                                                         \
  63        R##_s = Y##_s;                                          \
  64        _FP_FRAC_COPY_##wc(R,Y);                                \
  65      }                                                         \
  66    else                                                        \
  67      {                                                         \
  68        R##_s = X##_s;                                          \
  69        _FP_FRAC_COPY_##wc(R,X);                                \
  70      }                                                         \
  71    R##_c = FP_CLS_NAN;                                         \
  72  } while (0)
  73
  74/* Some assembly to speed things up. */
  75#define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({          \
  76        unsigned int __r2 = (x2) + (y2);                        \
  77        unsigned int __r1 = (x1);                               \
  78        unsigned int __r0 = (x0);                               \
  79        asm volatile(                                           \
  80                "       alr     %2,%3\n"                        \
  81                "       brc     12,0f\n"                        \
  82                "       lhi     0,1\n"                          \
  83                "       alr     %1,0\n"                         \
  84                "       brc     12,0f\n"                        \
  85                "       alr     %0,0\n"                         \
  86                "0:"                                            \
  87                : "+&d" (__r2), "+&d" (__r1), "+&d" (__r0)      \
  88                : "d" (y0), "i" (1) : "cc", "0" );              \
  89        asm volatile(                                           \
  90                "       alr     %1,%2\n"                        \
  91                "       brc     12,0f\n"                        \
  92                "       ahi     %0,1\n"                         \
  93                "0:"                                            \
  94                : "+&d" (__r2), "+&d" (__r1)                    \
  95                : "d" (y1) : "cc");                             \
  96        (r2) = __r2;                                            \
  97        (r1) = __r1;                                            \
  98        (r0) = __r0;                                            \
  99})
 100
 101#define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({          \
 102        unsigned int __r2 = (x2) - (y2);                        \
 103        unsigned int __r1 = (x1);                               \
 104        unsigned int __r0 = (x0);                               \
 105        asm volatile(                                           \
 106                "       slr   %2,%3\n"                          \
 107                "       brc     3,0f\n"                         \
 108                "       lhi     0,1\n"                          \
 109                "       slr     %1,0\n"                         \
 110                "       brc     3,0f\n"                         \
 111                "       slr     %0,0\n"                         \
 112                "0:"                                            \
 113                : "+&d" (__r2), "+&d" (__r1), "+&d" (__r0)      \
 114                : "d" (y0) : "cc", "0");                        \
 115        asm volatile(                                           \
 116                "       slr     %1,%2\n"                        \
 117                "       brc     3,0f\n"                         \
 118                "       ahi     %0,-1\n"                        \
 119                "0:"                                            \
 120                : "+&d" (__r2), "+&d" (__r1)                    \
 121                : "d" (y1) : "cc");                             \
 122        (r2) = __r2;                                            \
 123        (r1) = __r1;                                            \
 124        (r0) = __r0;                                            \
 125})
 126
 127#define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
 128
 129/* Obtain the current rounding mode. */
 130#define FP_ROUNDMODE    mode
 131
 132/* Exception flags. */
 133#define FP_EX_INVALID           0x800000
 134#define FP_EX_DIVZERO           0x400000
 135#define FP_EX_OVERFLOW          0x200000
 136#define FP_EX_UNDERFLOW         0x100000
 137#define FP_EX_INEXACT           0x080000
 138
 139/* We write the results always */
 140#define FP_INHIBIT_RESULTS 0
 141
 142#endif
 143