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sfp-machine_32.h

/* Machine-dependent software floating-point definitions.
   Sparc userland (_Q_*) version.
   Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson (rth@cygnus.com),
              Jakub Jelinek (jj@ultra.linux.cz),
              David S. Miller (davem@redhat.com) and
              Peter Maydell (pmaydell@chiark.greenend.org.uk).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If
   not, write to the Free Software Foundation, Inc.,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef _SFP_MACHINE_H
#define _SFP_MACHINE_H


#define _FP_W_TYPE_SIZE       32
#define _FP_W_TYPE            unsigned long
#define _FP_WS_TYPE           signed long
#define _FP_I_TYPE            long

#define _FP_MUL_MEAT_S(R,X,Y)                         \
  _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
#define _FP_MUL_MEAT_D(R,X,Y)                         \
  _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
#define _FP_MUL_MEAT_Q(R,X,Y)                         \
  _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)

#define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_udiv(S,R,X,Y)
#define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
#define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)

#define _FP_NANFRAC_S         ((_FP_QNANBIT_S << 1) - 1)
#define _FP_NANFRAC_D         ((_FP_QNANBIT_D << 1) - 1), -1
#define _FP_NANFRAC_Q         ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
#define _FP_NANSIGN_S         0
#define _FP_NANSIGN_D         0
#define _FP_NANSIGN_Q         0

#define _FP_KEEPNANFRACP 1

/* If one NaN is signaling and the other is not,
 * we choose that one, otherwise we choose X.
 */
/* For _Qp_* and _Q_*, this should prefer X, for
 * CPU instruction emulation this should prefer Y.
 * (see SPAMv9 B.2.2 section).
 */
#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                  \
  do {                                                \
    if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)            \
      && !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs))   \
      {                                               \
      R##_s = X##_s;                                  \
      _FP_FRAC_COPY_##wc(R,X);                        \
      }                                               \
    else                                        \
      {                                               \
      R##_s = Y##_s;                                  \
      _FP_FRAC_COPY_##wc(R,Y);                        \
      }                                               \
    R##_c = FP_CLS_NAN;                               \
  } while (0)

/* Some assembly to speed things up. */
#define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)               \
  __asm__ ("addcc %r7,%8,%2\n\t"                            \
         "addxcc %r5,%6,%1\n\t"                             \
         "addx %r3,%4,%0\n"                                 \
         : "=r" ((USItype)(r2)),                            \
           "=&r" ((USItype)(r1)),                           \
           "=&r" ((USItype)(r0))                            \
         : "%rJ" ((USItype)(x2)),                           \
           "rI" ((USItype)(y2)),                            \
           "%rJ" ((USItype)(x1)),                           \
           "rI" ((USItype)(y1)),                            \
           "%rJ" ((USItype)(x0)),                           \
           "rI" ((USItype)(y0))                             \
         : "cc")

#define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)               \
  __asm__ ("subcc %r7,%8,%2\n\t"                            \
          "subxcc %r5,%6,%1\n\t"                            \
          "subx %r3,%4,%0\n"                                \
         : "=r" ((USItype)(r2)),                            \
           "=&r" ((USItype)(r1)),                           \
           "=&r" ((USItype)(r0))                            \
         : "%rJ" ((USItype)(x2)),                           \
           "rI" ((USItype)(y2)),                            \
           "%rJ" ((USItype)(x1)),                           \
           "rI" ((USItype)(y1)),                            \
           "%rJ" ((USItype)(x0)),                           \
           "rI" ((USItype)(y0))                             \
         : "cc")

#define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)            \
  do {                                                      \
    /* We need to fool gcc,  as we need to pass more than 10            \
       input/outputs.  */                                   \
    register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");            \
    __asm__ __volatile__ (                                  \
          "addcc %r8,%9,%1\n\t"                             \
          "addxcc %r6,%7,%0\n\t"                            \
          "addxcc %r4,%5,%%g2\n\t"                          \
          "addx %r2,%3,%%g1\n\t"                            \
         : "=&r" ((USItype)(r1)),                           \
           "=&r" ((USItype)(r0))                            \
         : "%rJ" ((USItype)(x3)),                           \
           "rI" ((USItype)(y3)),                            \
           "%rJ" ((USItype)(x2)),                           \
           "rI" ((USItype)(y2)),                            \
           "%rJ" ((USItype)(x1)),                           \
           "rI" ((USItype)(y1)),                            \
           "%rJ" ((USItype)(x0)),                           \
           "rI" ((USItype)(y0))                             \
         : "cc", "g1", "g2");                               \
    __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));                 \
    r3 = _t1; r2 = _t2;                                     \
  } while (0)

#define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)            \
  do {                                                      \
    /* We need to fool gcc,  as we need to pass more than 10            \
       input/outputs.  */                                   \
    register USItype _t1 __asm__ ("g1"), _t2 __asm__ ("g2");            \
    __asm__ __volatile__ (                                  \
          "subcc %r8,%9,%1\n\t"                             \
          "subxcc %r6,%7,%0\n\t"                            \
          "subxcc %r4,%5,%%g2\n\t"                          \
          "subx %r2,%3,%%g1\n\t"                            \
         : "=&r" ((USItype)(r1)),                           \
           "=&r" ((USItype)(r0))                            \
         : "%rJ" ((USItype)(x3)),                           \
           "rI" ((USItype)(y3)),                            \
           "%rJ" ((USItype)(x2)),                           \
           "rI" ((USItype)(y2)),                            \
           "%rJ" ((USItype)(x1)),                           \
           "rI" ((USItype)(y1)),                            \
           "%rJ" ((USItype)(x0)),                           \
           "rI" ((USItype)(y0))                             \
         : "cc", "g1", "g2");                               \
    __asm__ __volatile__ ("" : "=r" (_t1), "=r" (_t2));                 \
    r3 = _t1; r2 = _t2;                                     \
  } while (0)

#define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)

#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)

#define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i)                           \
  __asm__ ("addcc %3,%4,%3\n\t"                                   \
         "addxcc %2,%%g0,%2\n\t"                            \
         "addxcc %1,%%g0,%1\n\t"                            \
         "addx %0,%%g0,%0\n\t"                              \
         : "=&r" ((USItype)(x3)),                           \
           "=&r" ((USItype)(x2)),                           \
           "=&r" ((USItype)(x1)),                           \
           "=&r" ((USItype)(x0))                            \
         : "rI" ((USItype)(i)),                             \
           "0" ((USItype)(x3)),                             \
           "1" ((USItype)(x2)),                             \
           "2" ((USItype)(x1)),                             \
           "3" ((USItype)(x0))                              \
         : "cc")

#ifndef CONFIG_SMP
extern struct task_struct *last_task_used_math;
#endif

/* Obtain the current rounding mode. */
#ifndef FP_ROUNDMODE
#ifdef CONFIG_SMP
#define FP_ROUNDMODE    ((current->thread.fsr >> 30) & 0x3)
#else
#define FP_ROUNDMODE    ((last_task_used_math->thread.fsr >> 30) & 0x3)
#endif
#endif

/* Exception flags. */
#define FP_EX_INVALID         (1 << 4)
#define FP_EX_OVERFLOW        (1 << 3)
#define FP_EX_UNDERFLOW       (1 << 2)
#define FP_EX_DIVZERO         (1 << 1)
#define FP_EX_INEXACT         (1 << 0)

#define FP_HANDLE_EXCEPTIONS return _fex

#ifdef CONFIG_SMP
#define FP_INHIBIT_RESULTS ((current->thread.fsr >> 23) & _fex)
#else
#define FP_INHIBIT_RESULTS ((last_task_used_math->thread.fsr >> 23) & _fex)
#endif

#ifdef CONFIG_SMP
#define FP_TRAPPING_EXCEPTIONS ((current->thread.fsr >> 23) & 0x1f)
#else
#define FP_TRAPPING_EXCEPTIONS ((last_task_used_math->thread.fsr >> 23) & 0x1f)
#endif

#endif

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