i386/linux-2.3.21/arch/sparc/math-emu/sfp-machine.h

   1 /* Machine-dependent software floating-point definitions.
   2    Sparc userland (_Q_*) 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 #define _FP_W_TYPE_SIZE         32
  29 #define _FP_W_TYPE              unsigned long
  30 #define _FP_WS_TYPE             signed long
  31 #define _FP_I_TYPE              long
  32
  33 #define _FP_MUL_MEAT_S(R,X,Y)                                   \
  34   _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
  35 #define _FP_MUL_MEAT_D(R,X,Y)                                   \
  36   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
  37 #define _FP_MUL_MEAT_Q(R,X,Y)                                   \
  38   _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
  39
  40 #define _FP_DIV_MEAT_S(R,X,Y)   _FP_DIV_MEAT_1_udiv(S,R,X,Y)
  41 #define _FP_DIV_MEAT_D(R,X,Y)   _FP_DIV_MEAT_2_udiv(D,R,X,Y)
  42 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
  43
  44 #define _FP_NANFRAC_S           ((_FP_QNANBIT_S << 1) - 1)
  45 #define _FP_NANFRAC_D           ((_FP_QNANBIT_D << 1) - 1), -1
  46 #define _FP_NANFRAC_Q           ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
  47 #define _FP_NANSIGN_S           0
  48 #define _FP_NANSIGN_D           0
  49 #define _FP_NANSIGN_Q           0
  50
  51 #define _FP_KEEPNANFRACP 1
  52
  53 /* If one NaN is signaling and the other is not,
  54  * we choose that one, otherwise we choose X.
  55  */
  56 /* For _Qp_* and _Q_*, this should prefer X, for
  57  * CPU instruction emulation this should prefer Y.
  58  * (see SPAMv9 B.2.2 section).
  59  */
  60 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  61   do {                                                          \
  62     if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)          \
  63         && !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs))     \
  64       {                                                         \
  65         R##_s = X##_s;                                          \
  66         _FP_FRAC_COPY_##wc(R,X);                                \
  67       }                                                         \
  68     else                                                        \
  69       {                                                         \
  70         R##_s = Y##_s;                                          \
  71         _FP_FRAC_COPY_##wc(R,Y);                                \
  72       }                                                         \
  73     R##_c = FP_CLS_NAN;                                         \
  74   } while (0)
  75
  76 /* Some assembly to speed things up. */
  77 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)                     \
  78   __asm__ ("addcc %r7,%8,%2
  79             addxcc %r5,%6,%1
  80             addx %r3,%4,%0"                                             \
  81            : "=r" ((USItype)(r2)),                                      \
  82              "=&r" ((USItype)(r1)),                                     \
  83              "=&r" ((USItype)(r0))                                      \
  84            : "%rJ" ((USItype)(x2)),                                     \
  85              "rI" ((USItype)(y2)),                                      \
  86              "%rJ" ((USItype)(x1)),                                     \
  87              "rI" ((USItype)(y1)),                                      \
  88              "%rJ" ((USItype)(x0)),                                     \
  89              "rI" ((USItype)(y0))                                       \
  90            : "cc")
  91
  92 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)                     \
  93   __asm__ ("subcc %r7,%8,%2
  94             subxcc %r5,%6,%1
  95             subx %r3,%4,%0"                                             \
  96            : "=r" ((USItype)(r2)),                                      \
  97              "=&r" ((USItype)(r1)),                                     \
  98              "=&r" ((USItype)(r0))                                      \
  99            : "%rJ" ((USItype)(x2)),                                     \
 100              "rI" ((USItype)(y2)),                                      \
 101              "%rJ" ((USItype)(x1)),                                     \
 102              "rI" ((USItype)(y1)),                                      \
 103              "%rJ" ((USItype)(x0)),                                     \
 104              "rI" ((USItype)(y0))                                       \
 105            : "cc")
 106
 107 #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)            \
 108   do {                                                                  \
 109     /* We need to fool gcc,  as we need to pass more than 10            \
 110        input/outputs.  */                                               \
 111     register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");            \
 112     __asm__ __volatile__ ("
 113             addcc %r8,%9,%1
 114             addxcc %r6,%7,%0
 115             addxcc %r4,%5,%%g2
 116             addx %r2,%3,%%g1"                                           \
 117            : "=&r" ((USItype)(r1)),                                     \
 118              "=&r" ((USItype)(r0))                                      \
 119            : "%rJ" ((USItype)(x3)),                                     \
 120              "rI" ((USItype)(y3)),                                      \
 121              "%rJ" ((USItype)(x2)),                                     \
 122              "rI" ((USItype)(y2)),                                      \
 123              "%rJ" ((USItype)(x1)),                                     \
 124              "rI" ((USItype)(y1)),                                      \
 125              "%rJ" ((USItype)(x0)),                                     \
 126              "rI" ((USItype)(y0))                                       \
 127            : "cc", "g1", "g2");                                         \
 128     __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));                 \
 129     r3 = _t1; r2 = _t2;                                                 \
 130   } while (0)
 131
 132 #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)            \
 133   do {                                                                  \
 134     /* We need to fool gcc,  as we need to pass more than 10            \
 135        input/outputs.  */                                               \
 136     register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");            \
 137     __asm__ __volatile__ ("
 138             subcc %r8,%9,%1
 139             subxcc %r6,%7,%0
 140             subxcc %r4,%5,%%g2
 141             subx %r2,%3,%%g1"                                           \
 142            : "=&r" ((USItype)(r1)),                                     \
 143              "=&r" ((USItype)(r0))                                      \
 144            : "%rJ" ((USItype)(x3)),                                     \
 145              "rI" ((USItype)(y3)),                                      \
 146              "%rJ" ((USItype)(x2)),                                     \
 147              "rI" ((USItype)(y2)),                                      \
 148              "%rJ" ((USItype)(x1)),                                     \
 149              "rI" ((USItype)(y1)),                                      \
 150              "%rJ" ((USItype)(x0)),                                     \
 151              "rI" ((USItype)(y0))                                       \
 152            : "cc", "g1", "g2");                                         \
 153     __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));                 \
 154     r3 = _t1; r2 = _t2;                                                 \
 155   } while (0)
 156
 157 #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
 158
 159 #define __FP_FRAC_DEC_4(x3,x2,x1,x0,y3,y2,y1,y0) __FP_FRAC_SUB_4(x3,x2,x1,x0,x3,x2,x1,x0,y3,y2,y1,y0)
 160
 161 #define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i)                                 \
 162   __asm__ ("addcc %3,%4,%3
 163             addxcc %2,%%g0,%2
 164             addxcc %1,%%g0,%1
 165             addx %0,%%g0,%0"                                            \
 166            : "=&r" ((USItype)(x3)),                                     \
 167              "=&r" ((USItype)(x2)),                                     \
 168              "=&r" ((USItype)(x1)),                                     \
 169              "=&r" ((USItype)(x0))                                      \
 170            : "rI" ((USItype)(i)),                                       \
 171              "0" ((USItype)(x3)),                                       \
 172              "1" ((USItype)(x2)),                                       \
 173              "2" ((USItype)(x1)),                                       \
 174              "3" ((USItype)(x0))                                        \
 175            : "cc")
 176
 177 #ifndef __SMP__
 178 extern struct task_struct *last_task_used_math;
 179 #endif
 180
 181 /* Obtain the current rounding mode. */
 182 #ifndef FP_ROUNDMODE
 183 #ifdef __SMP__
 184 #define FP_ROUNDMODE    ((current->thread.fsr >> 30) & 0x3)
 185 #else
 186 #define FP_ROUNDMODE    ((last_task_used_math->thread.fsr >> 30) & 0x3)
 187 #endif
 188 #endif
 189
 190 /* Exception flags. */
 191 #define FP_EX_INVALID           (1 << 4)
 192 #define FP_EX_OVERFLOW          (1 << 3)
 193 #define FP_EX_UNDERFLOW         (1 << 2)
 194 #define FP_EX_DIVZERO           (1 << 1)
 195 #define FP_EX_INEXACT           (1 << 0)
 196
 197 #define FP_HANDLE_EXCEPTIONS return _fex
 198
 199 #ifdef __SMP__
 200 #define FP_INHIBIT_RESULTS ((current->thread.fsr >> 23) & _fex)
 201 #else
 202 #define FP_INHIBIT_RESULTS ((last_task_used_math->thread.fsr >> 23) & _fex)
 203 #endif
 204
 205 #endif