text: /* Subroutines for insn-output.c for Motorola 68000 family.
     Copyright (C) 1987 Free Software Foundation, Inc.
  
  This file is part of GNU CC.
  
  GNU CC is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2, or (at your option)
  any later version.
  
  GNU CC 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 General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with GNU CC; see the file COPYING.  If not, write to
  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  
  
  /* Some output-actions in m68k.md need these.  */
  #include <stdio.h>
  #include "config.h"
  #include "rtl.h"
  #include "regs.h"
  #include "hard-reg-set.h"
  #include "real.h"
  #include "insn-config.h"
  #include "conditions.h"
  #include "insn-flags.h"
  #include "output.h"
  #include "insn-attr.h"
  
  /* Needed for use_return_insn.  */
  #include "flags.h"
  
  #ifdef SUPPORT_SUN_FPA
  
  /* Index into this array by (register number >> 3) to find the
     smallest class which contains that register.  */
  enum reg_class regno_reg_class[]
    = { DATA_REGS, ADDR_REGS, FP_REGS,
        LO_FPA_REGS, LO_FPA_REGS, FPA_REGS, FPA_REGS };
  
  #endif /* defined SUPPORT_SUN_FPA */
  
  /* This flag is used to communicate between movhi and ASM_OUTPUT_CASE_END,
     if SGS_SWITCH_TABLE.  */
  int switch_table_difference_label_flag;
  
  static rtx find_addr_reg ();
  rtx legitimize_pic_address ();
  
  
  /* Emit a (use pic_offset_table_rtx) if we used PIC relocation in the 
     function at any time during the compilation process.  In the future 
     we should try and eliminate the USE if we can easily determine that 
     all PIC references were deleted from the current function.  That would 
     save an address register */
     
  finalize_pic ()
  {
    if (flag_pic && current_function_uses_pic_offset_table)
      emit_insn (gen_rtx (USE, VOIDmode, pic_offset_table_rtx));
  }
  
  
  /* This function generates the assembly code for function entry.
     STREAM is a stdio stream to output the code to.
     SIZE is an int: how many units of temporary storage to allocate.
     Refer to the array `regs_ever_live' to determine which registers
     to save; `regs_ever_live[I]' is nonzero if register number I
     is ever used in the function.  This function is responsible for
     knowing which registers should not be saved even if used.  */
  
  
  /* Note that the order of the bit mask for fmovem is the opposite
     of the order for movem!  */
  
  
  void
  output_function_prologue (stream, size)
       FILE *stream;
       int size;
  {
    register int regno;
    register int mask = 0;
    int num_saved_regs = 0;
    extern char call_used_regs[];
    int fsize = (size + 3) & -4;
    
  
    if (frame_pointer_needed)
      {
        /* Adding negative number is faster on the 68040.  */
        if (fsize < 0x8000 && !TARGET_68040)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tlink.w %s,%0I%d\n",
  		       reg_names[FRAME_POINTER_REGNUM], -fsize);
  #else
  	  asm_fprintf (stream, "\tlink %s,%0I%d\n",
  		       reg_names[FRAME_POINTER_REGNUM], -fsize);
  #endif
  	}
        else if (TARGET_68020)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tlink.l %s,%0I%d\n",
  		       reg_names[FRAME_POINTER_REGNUM], -fsize);
  #else
  	  asm_fprintf (stream, "\tlink %s,%0I%d\n",
  		       reg_names[FRAME_POINTER_REGNUM], -fsize);
  #endif
  	}
        else
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tlink.w %s,%0I0\n\tadd.l %0I%d,%Rsp\n",
  		       reg_names[FRAME_POINTER_REGNUM], -fsize);
  #else
  	  asm_fprintf (stream, "\tlink %s,%0I0\n\taddl %0I%d,%Rsp\n",
  		       reg_names[FRAME_POINTER_REGNUM], -fsize);
  #endif
  	}
      }
    else if (fsize)
      {
        /* Adding negative number is faster on the 68040.  */
        if (fsize + 4 < 0x8000)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tadd.w %0I%d,%Rsp\n", - (fsize + 4));
  #else
  	  asm_fprintf (stream, "\taddw %0I%d,%Rsp\n", - (fsize + 4));
  #endif
  	}
        else
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tadd.l %0I%d,%Rsp\n", - (fsize + 4));
  #else
  	  asm_fprintf (stream, "\taddl %0I%d,%Rsp\n", - (fsize + 4));
  #endif
  	}
      }
  #ifdef SUPPORT_SUN_FPA
    for (regno = 24; regno < 56; regno++)
      if (regs_ever_live[regno] && ! call_used_regs[regno])
        {
  #ifdef MOTOROLA
  	asm_fprintf (stream, "\tfpmovd %s,-(%Rsp)\n",
  		     reg_names[regno]);
  #else
  	asm_fprintf (stream, "\tfpmoved %s,%Rsp@-\n",
  		     reg_names[regno]);
  #endif
        }
  #endif
    for (regno = 16; regno < 24; regno++)
      if (regs_ever_live[regno] && ! call_used_regs[regno])
         mask |= 1 << (regno - 16);
    if ((mask & 0xff) != 0)
      {
  #ifdef MOTOROLA
        asm_fprintf (stream, "\tfmovm %0I0x%x,-(%Rsp)\n", mask & 0xff);
  #else
        asm_fprintf (stream, "\tfmovem %0I0x%x,%Rsp@-\n", mask & 0xff);
  #endif
      }
    mask = 0;
    for (regno = 0; regno < 16; regno++)
      if (regs_ever_live[regno] && ! call_used_regs[regno])
        {
          mask |= 1 << (15 - regno);
          num_saved_regs++;
        }
    if (frame_pointer_needed)
      {
        mask &= ~ (1 << (15 - FRAME_POINTER_REGNUM));
        num_saved_regs--;
      }
  
  #if NEED_PROBE
    fprintf (stream, "\ttstl sp@(%d)\n", NEED_PROBE - num_saved_regs * 4);
  #endif
  
    if (num_saved_regs <= 2)
      {
        /* Store each separately in the same order moveml uses.
           Using two movel instructions instead of a single moveml
           is about 15% faster for the 68020 and 68030 at no expense
           in code size */
  
        int i;
  
        /* Undo the work from above. */
        for (i = 0; i< 16; i++)
          if (mask & (1 << i))
            asm_fprintf (stream,
  #ifdef MOTOROLA
  		       "\t%Omove.l %s,-(%Rsp)\n",
  #else
  		       "\tmovel %s,%Rsp@-\n",
  #endif
  		       reg_names[15 - i]);
      }
    else if (mask)
      {
  #ifdef MOTOROLA
        asm_fprintf (stream, "\tmovm.l %0I0x%x,-(%Rsp)\n", mask);
  #else
        asm_fprintf (stream, "\tmoveml %0I0x%x,%Rsp@-\n", mask);
  #endif
      }
    if (flag_pic && current_function_uses_pic_offset_table)
      {
  #ifdef MOTOROLA
        asm_fprintf (stream, "\t%Omove.l %0I__GLOBAL_OFFSET_TABLE_, %s\n",
  		   reg_names[PIC_OFFSET_TABLE_REGNUM]);
        asm_fprintf (stream, "\tlea.l (%Rpc,%s.l),%s\n",
  		   reg_names[PIC_OFFSET_TABLE_REGNUM],
  		   reg_names[PIC_OFFSET_TABLE_REGNUM]);
  #else
        asm_fprintf (stream, "\tmovel %0I__GLOBAL_OFFSET_TABLE_, %s\n",
  		   reg_names[PIC_OFFSET_TABLE_REGNUM]);
        asm_fprintf (stream, "\tlea %Rpc@(0,%s:l),%s\n",
  		   reg_names[PIC_OFFSET_TABLE_REGNUM],
  		   reg_names[PIC_OFFSET_TABLE_REGNUM]);
  #endif
      }
  }
  
  /* Return true if this function's epilogue can be output as RTL.  */
  
  int
  use_return_insn ()
  {
    int regno;
  
    if (!reload_completed || frame_pointer_needed || get_frame_size () != 0)
      return 0;
    
    /* Copied from output_function_epilogue ().  We should probably create a
       separate layout routine to perform the common work.  */
    
    for (regno = 0 ; regno < FIRST_PSEUDO_REGISTER ; regno++)
      if (regs_ever_live[regno] && ! call_used_regs[regno])
        return 0;
    
    return 1;
  }
  
  /* This function generates the assembly code for function exit,
     on machines that need it.  Args are same as for FUNCTION_PROLOGUE.
  
     The function epilogue should not depend on the current stack pointer!
     It should use the frame pointer only, if there is a frame pointer.
     This is mandatory because of alloca; we also take advantage of it to
     omit stack adjustments before returning.  */
  
  void
  output_function_epilogue (stream, size)
       FILE *stream;
       int size;
  {
    register int regno;
    register int mask, fmask;
    register int nregs;
    int offset, foffset, fpoffset;
    extern char call_used_regs[];
    int fsize = (size + 3) & -4;
    int big = 0;
    rtx insn = get_last_insn ();
    
    /* If the last insn was a BARRIER, we don't have to write any code.  */
    if (GET_CODE (insn) == NOTE)
      insn = prev_nonnote_insn (insn);
    if (insn && GET_CODE (insn) == BARRIER)
      {
        /* Output just a no-op so that debuggers don't get confused
  	 about which function the pc is in at this address.  */
        asm_fprintf (stream, "\tnop\n");
        return;
      }
  
  #ifdef FUNCTION_EXTRA_EPILOGUE
    FUNCTION_EXTRA_EPILOGUE (stream, size);
  #endif
    nregs = 0;  fmask = 0; fpoffset = 0;
  #ifdef SUPPORT_SUN_FPA
    for (regno = 24 ; regno < 56 ; regno++)
      if (regs_ever_live[regno] && ! call_used_regs[regno])
        nregs++;
    fpoffset = nregs * 8;
  #endif
    nregs = 0;
    for (regno = 16; regno < 24; regno++)
      if (regs_ever_live[regno] && ! call_used_regs[regno])
        {
          nregs++;
  	fmask |= 1 << (23 - regno);
        }
    foffset = fpoffset + nregs * 12;
    nregs = 0;  mask = 0;
    if (frame_pointer_needed)
      regs_ever_live[FRAME_POINTER_REGNUM] = 0;
    for (regno = 0; regno < 16; regno++)
      if (regs_ever_live[regno] && ! call_used_regs[regno])
        {
          nregs++;
  	mask |= 1 << regno;
        }
    offset = foffset + nregs * 4;
    if (offset + fsize >= 0x8000
        && frame_pointer_needed
        && (mask || fmask || fpoffset))
      {
  #ifdef MOTOROLA
        asm_fprintf (stream, "\t%Omove.l %0I%d,%Ra0\n", -fsize);
  #else
        asm_fprintf (stream, "\tmovel %0I%d,%Ra0\n", -fsize);
  #endif
        fsize = 0, big = 1;
      }
    if (nregs <= 2)
      {
        /* Restore each separately in the same order moveml does.
           Using two movel instructions instead of a single moveml
           is about 15% faster for the 68020 and 68030 at no expense
           in code size. */
  
        int i;
  
        /* Undo the work from above. */
        for (i = 0; i< 16; i++)
          if (mask & (1 << i))
            {
              if (big)
  	      {
  #ifdef MOTOROLA
  		asm_fprintf (stream, "\t%Omove.l -%d(%s,%Ra0.l),%s\n",
  			     offset + fsize,
  			     reg_names[FRAME_POINTER_REGNUM],
  			     reg_names[i]);
  #else
  		asm_fprintf (stream, "\tmovel %s@(-%d,%Ra0:l),%s\n",
  			     reg_names[FRAME_POINTER_REGNUM],
  			     offset + fsize, reg_names[i]);
  #endif
  	      }
              else if (! frame_pointer_needed)
  	      {
  #ifdef MOTOROLA
  		asm_fprintf (stream, "\t%Omove.l (%Rsp)+,%s\n",
  			     reg_names[i]);
  #else
  		asm_fprintf (stream, "\tmovel %Rsp@+,%s\n",
  			     reg_names[i]);
  #endif
  	      }
              else
  	      {
  #ifdef MOTOROLA
  		asm_fprintf (stream, "\t%Omove.l -%d(%s),%s\n",
  			     offset + fsize,
  			     reg_names[FRAME_POINTER_REGNUM],
  			     reg_names[i]);
  #else
  		asm_fprintf (stream, "\tmovel %s@(-%d),%s\n",
  			     reg_names[FRAME_POINTER_REGNUM],
  			     offset + fsize, reg_names[i]);
  #endif
  	      }
              offset = offset - 4;
            }
      }
    else if (mask)
      {
        if (big)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tmovm.l -%d(%s,%Ra0.l),%0I0x%x\n",
  		       offset + fsize,
  		       reg_names[FRAME_POINTER_REGNUM],
  		       mask);
  #else
  	  asm_fprintf (stream, "\tmoveml %s@(-%d,%Ra0:l),%0I0x%x\n",
  		       reg_names[FRAME_POINTER_REGNUM],
  		       offset + fsize, mask);
  #endif
  	}
        else if (! frame_pointer_needed)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tmovm.l (%Rsp)+,%0I0x%x\n", mask);
  #else
  	  asm_fprintf (stream, "\tmoveml %Rsp@+,%0I0x%x\n", mask);
  #endif
  	}
        else
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tmovm.l -%d(%s),%0I0x%x\n",
  		       offset + fsize,
  		       reg_names[FRAME_POINTER_REGNUM],
  		       mask);
  #else
  	  asm_fprintf (stream, "\tmoveml %s@(-%d),%0I0x%x\n",
  		       reg_names[FRAME_POINTER_REGNUM],
  		       offset + fsize, mask);
  #endif
  	}
      }
    if (fmask)
      {
        if (big)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tfmovm -%d(%s,%Ra0.l),%0I0x%x\n",
  		       foffset + fsize,
  		       reg_names[FRAME_POINTER_REGNUM],
  		       fmask);
  #else
  	  asm_fprintf (stream, "\tfmovem %s@(-%d,%Ra0:l),%0I0x%x\n",
  		       reg_names[FRAME_POINTER_REGNUM],
  		       foffset + fsize, fmask);
  #endif
  	}
        else if (! frame_pointer_needed)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tfmovm (%Rsp)+,%0I0x%x\n", fmask);
  #else
  	  asm_fprintf (stream, "\tfmovem %Rsp@+,%0I0x%x\n", fmask);
  #endif
  	}
        else
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tfmovm -%d(%s),%0I0x%x\n",
  		       foffset + fsize,
  		       reg_names[FRAME_POINTER_REGNUM],
  		       fmask);
  #else
  	  asm_fprintf (stream, "\tfmovem %s@(-%d),%0I0x%x\n",
  		       reg_names[FRAME_POINTER_REGNUM],
  		       foffset + fsize, fmask);
  #endif
  	}
      }
    if (fpoffset != 0)
      for (regno = 55; regno >= 24; regno--)
        if (regs_ever_live[regno] && ! call_used_regs[regno])
          {
  	  if (big)
  	    {
  #ifdef MOTOROLA
  	      asm_fprintf (stream, "\tfpmovd -%d(%s,%Ra0.l), %s\n",
  			   fpoffset + fsize,
  			   reg_names[FRAME_POINTER_REGNUM],
  			   reg_names[regno]);
  #else
  	      asm_fprintf (stream, "\tfpmoved %s@(-%d,%Ra0:l), %s\n",
  			   reg_names[FRAME_POINTER_REGNUM],
  			   fpoffset + fsize, reg_names[regno]);
  #endif
  	    }
  	  else if (! frame_pointer_needed)
  	    {
  #ifdef MOTOROLA
  	      asm_fprintf (stream, "\tfpmovd (%Rsp)+,%s\n",
  			   reg_names[regno]);
  #else
  	      asm_fprintf (stream, "\tfpmoved %Rsp@+, %s\n",
  			   reg_names[regno]);
  #endif
  	    }
  	  else
  	    {
  #ifdef MOTOROLA
  	      asm_fprintf (stream, "\tfpmovd -%d(%s), %s\n",
  			   fpoffset + fsize,
  			   reg_names[FRAME_POINTER_REGNUM],
  			   reg_names[regno]);
  #else
  	      asm_fprintf (stream, "\tfpmoved %s@(-%d), %s\n",
  			   reg_names[FRAME_POINTER_REGNUM],
  			   fpoffset + fsize, reg_names[regno]);
  #endif
  	    }
  	  fpoffset -= 8;
  	}
    if (frame_pointer_needed)
      fprintf (stream, "\tunlk %s\n",
  	     reg_names[FRAME_POINTER_REGNUM]);
    else if (fsize)
      {
        if (fsize + 4 < 0x8000)
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tadd.w %0I%d,%Rsp\n", fsize + 4);
  #else
  	  asm_fprintf (stream, "\taddw %0I%d,%Rsp\n", fsize + 4);
  #endif
  	}
        else
  	{
  #ifdef MOTOROLA
  	  asm_fprintf (stream, "\tadd.l %0I%d,%Rsp\n", fsize + 4);
  #else
  	  asm_fprintf (stream, "\taddl %0I%d,%Rsp\n", fsize + 4);
  #endif
  	}
      }
    if (current_function_pops_args)
      asm_fprintf (stream, "\trtd %0I%d\n", current_function_pops_args);
    else
      fprintf (stream, "\trts\n");
  }
  
  /* Similar to general_operand, but exclude stack_pointer_rtx.  */
  
  int
  not_sp_operand (op, mode)
       register rtx op;
       enum machine_mode mode;
  {
    return op != stack_pointer_rtx && general_operand (op, mode);
  }
  
  /* Return TRUE if X is a valid comparison operator for the dbcc 
     instruction.  
  
     Note it rejects floating point comparison operators.
     (In the future we could use Fdbcc).
  
     It also rejects some comparisons when CC_NO_OVERFLOW is set.  */
     
  int
  valid_dbcc_comparison_p (x, mode)
       rtx x;
       enum machine_mode mode;
  {
    /* We could add support for these in the future */
    if (cc_prev_status.flags & CC_IN_68881)
      return 0;
  
    switch (GET_CODE (x))
      {
  
        case EQ: case NE: case GTU: case LTU:
        case GEU: case LEU:
          return 1;
  
        /* Reject some when CC_NO_OVERFLOW is set.  This may be over
           conservative */
        case GT: case LT: case GE: case LE:
          return ! (cc_prev_status.flags & CC_NO_OVERFLOW);
        default:
          return 0;
      }
  }
  
  /* Output a dbCC; jCC sequence.  Note we do not handle the 
     floating point version of this sequence (Fdbcc).  We also
     do not handle alternative conditions when CC_NO_OVERFLOW is
     set.  It is assumed that valid_dbcc_comparison_p will kick
     those out before we get here.  */
  
  output_dbcc_and_branch (operands)
       rtx *operands;
  {
   
    switch (GET_CODE (operands[3]))
      {
        case EQ:
  #ifdef MOTOROLA
          output_asm_insn ("dbeq %0,%l1\n\tjbeq %l2", operands);
  #else
          output_asm_insn ("dbeq %0,%l1\n\tjeq %l2", operands);
  #endif
          break;
  
        case NE:
  #ifdef MOTOROLA
          output_asm_insn ("dbne %0,%l1\n\tjbne %l2", operands);
  #else
          output_asm_insn ("dbne %0,%l1\n\tjne %l2", operands);
  #endif
          break;
  
        case GT:
  #ifdef MOTOROLA
          output_asm_insn ("dbgt %0,%l1\n\tjbgt %l2", operands);
  #else
          output_asm_insn ("dbgt %0,%l1\n\tjgt %l2", operands);
  #endif
          break;
  
        case GTU:
  #ifdef MOTOROLA
          output_asm_insn ("dbhi %0,%l1\n\tjbhi %l2", operands);
  #else
          output_asm_insn ("dbhi %0,%l1\n\tjhi %l2", operands);
  #endif
          break;
  
        case LT:
  #ifdef MOTOROLA
          output_asm_insn ("dblt %0,%l1\n\tjblt %l2", operands);
  #else
          output_asm_insn ("dblt %0,%l1\n\tjlt %l2", operands);
  #endif
          break;
  
        case LTU:
  #ifdef MOTOROLA
          output_asm_insn ("dbcs %0,%l1\n\tjbcs %l2", operands);
  #else
          output_asm_insn ("dbcs %0,%l1\n\tjcs %l2", operands);
  #endif
          break;
  
        case GE:
  #ifdef MOTOROLA
          output_asm_insn ("dbge %0,%l1\n\tjbge %l2", operands);
  #else
          output_asm_insn ("dbge %0,%l1\n\tjge %l2", operands);
  #endif
          break;
  
        case GEU:
  #ifdef MOTOROLA
          output_asm_insn ("dbcc %0,%l1\n\tjbcc %l2", operands);
  #else
          output_asm_insn ("dbcc %0,%l1\n\tjcc %l2", operands);
  #endif
          break;
  
        case LE:
  #ifdef MOTOROLA
          output_asm_insn ("dble %0,%l1\n\tjble %l2", operands);
  #else
          output_asm_insn ("dble %0,%l1\n\tjle %l2", operands);
  #endif
          break;
  
        case LEU:
  #ifdef MOTOROLA
          output_asm_insn ("dbls %0,%l1\n\tjbls %l2", operands);
  #else
          output_asm_insn ("dbls %0,%l1\n\tjls %l2", operands);
  #endif
          break;
  
        default:
  	abort ();
      }
  
    /* If the decrement is to be done in SImode, then we have
       to compensate for the fact that dbcc decrements in HImode. */
    switch (GET_MODE (operands[0]))
      {
        case SImode:
  #ifdef MOTOROLA
          output_asm_insn ("clr%.w %0\n\tsubq%.l %#1,%0\n\tjbpl %l1", operands);
  #else
          output_asm_insn ("clr%.w %0\n\tsubq%.l %#1,%0\n\tjpl %l1", operands);
  #endif
          break;
  
        case HImode:
          break;
  
        default:
          abort ();
      }
  }
  
  char *
  output_btst (operands, countop, dataop, insn, signpos)
       rtx *operands;
       rtx countop, dataop;
       rtx insn;
       int signpos;
  {
    operands[0] = countop;
    operands[1] = dataop;
  
    if (GET_CODE (countop) == CONST_INT)
      {
        register int count = INTVAL (countop);
        /* If COUNT is bigger than size of storage unit in use,
  	 advance to the containing unit of same size.  */
        if (count > signpos)
  	{
  	  int offset = (count & ~signpos) / 8;
  	  count = count & signpos;
  	  operands[1] = dataop = adj_offsettable_operand (dataop, offset);
  	}
        if (count == signpos)
  	cc_status.flags = CC_NOT_POSITIVE | CC_Z_IN_NOT_N;
        else
  	cc_status.flags = CC_NOT_NEGATIVE | CC_Z_IN_NOT_N;
  
        /* These three statements used to use next_insns_test_no...
  	 but it appears that this should do the same job.  */
        if (count == 31
  	  && next_insn_tests_no_inequality (insn))
  	return "tst%.l %1";
        if (count == 15
  	  && next_insn_tests_no_inequality (insn))
  	return "tst%.w %1";
        if (count == 7
  	  && next_insn_tests_no_inequality (insn))
  	return "tst%.b %1";
  
        cc_status.flags = CC_NOT_NEGATIVE;
      }
    return "btst %0,%1";
  }
  
  /* Returns 1 if OP is either a symbol reference or a sum of a symbol
     reference and a constant.  */
  
  int
  symbolic_operand (op, mode)
       register rtx op;
       enum machine_mode mode;
  {
    switch (GET_CODE (op))
      {
      case SYMBOL_REF:
      case LABEL_REF:
        return 1;
  
      case CONST:
        op = XEXP (op, 0);
        return ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
  	       || GET_CODE (XEXP (op, 0)) == LABEL_REF)
  	      && GET_CODE (XEXP (op, 1)) == CONST_INT);
  
  #if 0 /* Deleted, with corresponding change in m68k.h,
  	 so as to fit the specs.  No CONST_DOUBLE is ever symbolic.  */
      case CONST_DOUBLE:
        return GET_MODE (op) == mode;
  #endif
  
      default:
        return 0;
      }
  }
  
  
  /* Legitimize PIC addresses.  If the address is already
     position-independent, we return ORIG.  Newly generated
     position-independent addresses go to REG.  If we need more
     than one register, we lose.  
  
     An address is legitimized by making an indirect reference
     through the Global Offset Table with the name of the symbol
     used as an offset.  
  
     The assembler and linker are responsible for placing the 
     address of the symbol in the GOT.  The function prologue
     is responsible for initializing a5 to the starting address
     of the GOT.
  
     The assembler is also responsible for translating a symbol name
     into a constant displacement from the start of the GOT.  
  
     A quick example may make things a little clearer:
  
     When not generating PIC code to store the value 12345 into _foo
     we would generate the following code:
  
  	movel #12345, _foo
  
     When generating PIC two transformations are made.  First, the compiler
     loads the address of foo into a register.  So the first transformation makes:
  
  	lea	_foo, a0
  	movel   #12345, a0@
  
     The code in movsi will intercept the lea instruction and call this
     routine which will transform the instructions into:
  
  	movel   a5@(_foo:w), a0
  	movel   #12345, a0@
     
  
     That (in a nutshell) is how *all* symbol and label references are 
     handled.  */
  
  rtx
  legitimize_pic_address (orig, mode, reg)
       rtx orig, reg;
       enum machine_mode mode;
  {
    rtx pic_ref = orig;
  
    /* First handle a simple SYMBOL_REF or LABEL_REF */
    if (GET_CODE (orig) == SYMBOL_REF || GET_CODE (orig) == LABEL_REF)
      {
        if (reg == 0)
  	abort ();
  
        pic_ref = gen_rtx (MEM, Pmode,
  			 gen_rtx (PLUS, Pmode,
  				  pic_offset_table_rtx, orig));
        current_function_uses_pic_offset_table = 1;
        RTX_UNCHANGING_P (pic_ref) = 1;
        emit_move_insn (reg, pic_ref);
        return reg;
      }
    else if (GET_CODE (orig) == CONST)
      {
        rtx base, offset;
  
        /* Make sure this is CONST has not already been legitimized */
        if (GET_CODE (XEXP (orig, 0)) == PLUS
  	  && XEXP (XEXP (orig, 0), 0) == pic_offset_table_rtx)
  	return orig;
  
        if (reg == 0)
  	abort ();
  
        /* legitimize both operands of the PLUS */
        if (GET_CODE (XEXP (orig, 0)) == PLUS)
  	{
  	  base = legitimize_pic_address (XEXP (XEXP (orig, 0), 0), Pmode, reg);
  	  orig = legitimize_pic_address (XEXP (XEXP (orig, 0), 1), Pmode,
  					 base == reg ? 0 : reg);
  	}
        else abort ();
  
        if (GET_CODE (orig) == CONST_INT)
  	return plus_constant_for_output (base, INTVAL (orig));
        pic_ref = gen_rtx (PLUS, Pmode, base, orig);
        /* Likewise, should we set special REG_NOTEs here?  */
      }
    return pic_ref;
  }
  
  
  /* Return the best assembler insn template
     for moving operands[1] into operands[0] as a fullword.  */
  
  static char *
  singlemove_string (operands)
       rtx *operands;
  {
  #ifdef SUPPORT_SUN_FPA
    if (FPA_REG_P (operands[0]) || FPA_REG_P (operands[1]))
      return "fpmoves %1,%0";
  #endif
    if (DATA_REG_P (operands[0])
        && GET_CODE (operands[1]) == CONST_INT
        && INTVAL (operands[1]) < 128
        && INTVAL (operands[1]) >= -128)
      {
  #if defined (MOTOROLA) && !defined (CRDS)
        return "moveq%.l %1,%0";
  #else
        return "moveq %1,%0";
  #endif
      }
    if (operands[1] != const0_rtx)
      return "move%.l %1,%0";
    if (! ADDRESS_REG_P (operands[0]))
      return "clr%.l %0";
    return "sub%.l %0,%0";
  }
  
  /* Output assembler code to perform a doubleword move insn
     with operands OPERANDS.  */
  
  char *
  output_move_double (operands)
       rtx *operands;
  {
    enum { REGOP, OFFSOP, MEMOP, PUSHOP, POPOP, CNSTOP, RNDOP } optype0, optype1;
    rtx latehalf[2];
    rtx addreg0 = 0, addreg1 = 0;
  
    /* First classify both operands.  */
  
    if (REG_P (operands[0]))
      optype0 = REGOP;
    else if (offsettable_memref_p (operands[0]))
      optype0 = OFFSOP;
    else if (GET_CODE (XEXP (operands[0], 0)) == POST_INC)
      optype0 = POPOP;
    else if (GET_CODE (XEXP (operands[0], 0)) == PRE_DEC)
      optype0 = PUSHOP;
    else if (GET_CODE (operands[0]) == MEM)
      optype0 = MEMOP;
    else
      optype0 = RNDOP;
  
    if (REG_P (operands[1]))
      optype1 = REGOP;
    else if (CONSTANT_P (operands[1]))
      optype1 = CNSTOP;
    else if (offsettable_memref_p (operands[1]))
      optype1 = OFFSOP;
    else if (GET_CODE (XEXP (operands[1], 0)) == POST_INC)
      optype1 = POPOP;
    else if (GET_CODE (XEXP (operands[1], 0)) == PRE_DEC)
      optype1 = PUSHOP;
    else if (GET_CODE (operands[1]) == MEM)
      optype1 = MEMOP;
    else
      optype1 = RNDOP;
  
    /* Check for the cases that the operand constraints are not
       supposed to allow to happen.  Abort if we get one,
       because generating code for these cases is painful.  */
  
    if (optype0 == RNDOP || optype1 == RNDOP)
      abort ();
  
    /* If one operand is decrementing and one is incrementing
       decrement the former register explicitly
       and change that operand into ordinary indexing.  */
  
    if (optype0 == PUSHOP && optype1 == POPOP)
      {
        operands[0] = XEXP (XEXP (operands[0], 0), 0);
        output_asm_insn ("subq%.l %#8,%0", operands);
        operands[0] = gen_rtx (MEM, DImode, operands[0]);
        optype0 = OFFSOP;
      }
    if (optype0 == POPOP && optype1 == PUSHOP)
      {
        operands[1] = XEXP (XEXP (operands[1], 0), 0);
        output_asm_insn ("subq%.l %#8,%1", operands);
        operands[1] = gen_rtx (MEM, DImode, operands[1]);
        optype1 = OFFSOP;
      }
  
    /* If an operand is an unoffsettable memory ref, find a register
       we can increment temporarily to make it refer to the second word.  */
  
    if (optype0 == MEMOP)
      addreg0 = find_addr_reg (XEXP (operands[0], 0));
  
    if (optype1 == MEMOP)
      addreg1 = find_addr_reg (XEXP (operands[1], 0));
  
    /* Ok, we can do one word at a time.
       Normally we do the low-numbered word first,
       but if either operand is autodecrementing then we
       do the high-numbered word first.
  
       In either case, set up in LATEHALF the operands to use
       for the high-numbered word and in some cases alter the
       operands in OPERANDS to be suitable for the low-numbered word.  */
  
    if (optype0 == REGOP)
      latehalf[0] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
    else if (optype0 == OFFSOP)
      latehalf[0] = adj_offsettable_operand (operands[0], 4);
    else
      latehalf[0] = operands[0];
  
    if (optype1 == REGOP)
      latehalf[1] = gen_rtx (REG, SImode, REGNO (operands[1]) + 1);
    else if (optype1 == OFFSOP)
      latehalf[1] = adj_offsettable_operand (operands[1], 4);
    else if (optype1 == CNSTOP)
      split_double (operands[1], &operands[1], &latehalf[1]);
    else
      latehalf[1] = operands[1];
  
    /* If insn is effectively movd N(sp),-(sp) then we will do the
       high word first.  We should use the adjusted operand 1 (which is N+4(sp))
       for the low word as well, to compensate for the first decrement of sp.  */
    if (optype0 == PUSHOP
        && REGNO (XEXP (XEXP (operands[0], 0), 0)) == STACK_POINTER_REGNUM
        && reg_overlap_mentioned_p (stack_pointer_rtx, operands[1]))
      operands[1] = latehalf[1];
  
    /* If one or both operands autodecrementing,
       do the two words, high-numbered first.  */
  
    /* Likewise,  the first move would clobber the source of the second one,
       do them in the other order.  This happens only for registers;
       such overlap can't happen in memory unless the user explicitly
       sets it up, and that is an undefined circumstance.  */
  
    if (optype0 == PUSHOP || optype1 == PUSHOP
        || (optype0 == REGOP && optype1 == REGOP
  	  && REGNO (operands[0]) == REGNO (latehalf[1])))
      {
        /* Make any unoffsettable addresses point at high-numbered word.  */
        if (addreg0)
  	output_asm_insn ("addql %#4,%0", &addreg0);
        if (addreg1)
  	output_asm_insn ("addql %#4,%0", &addreg1);
  
        /* Do that word.  */
        output_asm_insn (singlemove_string (latehalf), latehalf);
  
        /* Undo the adds we just did.  */
        if (addreg0)
  	output_asm_insn ("subql %#4,%0", &addreg0);
        if (addreg1)
  	output_asm_insn ("subql %#4,%0", &addreg1);
  
        /* Do low-numbered word.  */
        return singlemove_string (operands);
      }
  
    /* Normal case: do the two words, low-numbered first.  */
  
    output_asm_insn (singlemove_string (operands), operands);
  
    /* Make any unoffsettable addresses point at high-numbered word.  */
    if (addreg0)
      output_asm_insn ("addql %#4,%0", &addreg0);
    if (addreg1)
      output_asm_insn ("addql %#4,%0", &addreg1);
  
    /* Do that word.  */
    output_asm_insn (singlemove_string (latehalf), latehalf);
  
    /* Undo the adds we just did.  */
    if (addreg0)
      output_asm_insn ("subql %#4,%0", &addreg0);
    if (addreg1)
      output_asm_insn ("subql %#4,%0", &addreg1);
  
    return "";
  }
  
  /* Return a REG that occurs in ADDR with coefficient 1.
     ADDR can be effectively incremented by incrementing REG.  */
  
  static rtx
  find_addr_reg (addr)
       rtx addr;
  {
    while (GET_CODE (addr) == PLUS)
      {
        if (GET_CODE (XEXP (addr, 0)) == REG)
  	addr = XEXP (addr, 0);
        else if (GET_CODE (XEXP (addr, 1)) == REG)
  	addr = XEXP (addr, 1);
        else if (CONSTANT_P (XEXP (addr, 0)))
  	addr = XEXP (addr, 1);
        else if (CONSTANT_P (XEXP (addr, 1)))
  	addr = XEXP (addr, 0);
        else
  	abort ();
      }
    if (GET_CODE (addr) == REG)
      return addr;
    abort ();
  }
  
  /* Store in cc_status the expressions that the condition codes will
     describe after execution of an instruction whose pattern is EXP.
     Do not alter them if the instruction would not alter the cc's.  */
  
  /* On the 68000, all the insns to store in an address register fail to
     set the cc's.  However, in some cases these instructions can make it
     possibly invalid to use the saved cc's.  In those cases we clear out
     some or all of the saved cc's so they won't be used.  */
  
  notice_update_cc (exp, insn)
       rtx exp;
       rtx insn;
  {
    /* If the cc is being set from the fpa and the expression is not an
       explicit floating point test instruction (which has code to deal with
       this), reinit the CC.  */
    if (((cc_status.value1 && FPA_REG_P (cc_status.value1))
         || (cc_status.value2 && FPA_REG_P (cc_status.value2)))
        && !(GET_CODE (exp) == PARALLEL
  	   && GET_CODE (XVECEXP (exp, 0, 0)) == SET
  	   && XEXP (XVECEXP (exp, 0, 0), 0) == cc0_rtx))
      {
        CC_STATUS_INIT; 
      }
    else if (GET_CODE (exp) == SET)
      {
        if (GET_CODE (SET_SRC (exp)) == CALL)
  	{
  	  CC_STATUS_INIT; 
  	}
        else if (ADDRESS_REG_P (SET_DEST (exp)))
  	{
  	  if (cc_status.value1
  	      && reg_overlap_mentioned_p (SET_DEST (exp), cc_status.value1))
  	    cc_status.value1 = 0;
  	  if (cc_status.value2
  	      && reg_overlap_mentioned_p (SET_DEST (exp), cc_status.value2))
  	    cc_status.value2 = 0; 
  	}
        else if (!FP_REG_P (SET_DEST (exp))
  	       && SET_DEST (exp) != cc0_rtx
  	       && (FP_REG_P (SET_SRC (exp))
  		   || GET_CODE (SET_SRC (exp)) == FIX
  		   || GET_CODE (SET_SRC (exp)) == FLOAT_TRUNCATE
  		   || GET_CODE (SET_SRC (exp)) == FLOAT_EXTEND))
  	{
  	  CC_STATUS_INIT; 
  	}
        /* A pair of move insns doesn't produce a useful overall cc.  */
        else if (!FP_REG_P (SET_DEST (exp))
  	       && !FP_REG_P (SET_SRC (exp))
  	       && GET_MODE_SIZE (GET_MODE (SET_SRC (exp))) > 4
  	       && (GET_CODE (SET_SRC (exp)) == REG
  		   || GET_CODE (SET_SRC (exp)) == MEM
  		   || GET_CODE (SET_SRC (exp)) == CONST_DOUBLE))
  	{
  	  CC_STATUS_INIT; 
  	}
        else if (GET_CODE (SET_SRC (exp)) == CALL)
  	{
  	  CC_STATUS_INIT; 
  	}
        else if (XEXP (exp, 0) != pc_rtx)
  	{
  	  cc_status.flags = 0;
  	  cc_status.value1 = XEXP (exp, 0);
  	  cc_status.value2 = XEXP (exp, 1);
  	}
      }
    else if (GET_CODE (exp) == PARALLEL
  	   && GET_CODE (XVECEXP (exp, 0, 0)) == SET)
      {
        if (ADDRESS_REG_P (XEXP (XVECEXP (exp, 0, 0), 0)))
  	CC_STATUS_INIT;
        else if (XEXP (XVECEXP (exp, 0, 0), 0) != pc_rtx)
  	{
  	  cc_status.flags = 0;
  	  cc_status.value1 = XEXP (XVECEXP (exp, 0, 0), 0);
  	  cc_status.value2 = XEXP (XVECEXP (exp, 0, 0), 1);
  	}
      }
    else
      CC_STATUS_INIT;
    if (cc_status.value2 != 0
        && ADDRESS_REG_P (cc_status.value2)
        && GET_MODE (cc_status.value2) == QImode)
      CC_STATUS_INIT;
    if (cc_status.value2 != 0
        && !(cc_status.value1 && FPA_REG_P (cc_status.value1)))
      switch (GET_CODE (cc_status.value2))
        {
        case PLUS: case MINUS: case MULT:
        case DIV: case UDIV: case MOD: case UMOD: case NEG:
        case ASHIFT: case LSHIFT: case ASHIFTRT: case LSHIFTRT:
        case ROTATE: case ROTATERT:
  	if (GET_MODE (cc_status.value2) != VOIDmode)
  	  cc_status.flags |= CC_NO_OVERFLOW;
  	break;
        case ZERO_EXTEND:
  	/* (SET r1 (ZERO_EXTEND r2)) on this machine
  	   ends with a move insn moving r2 in r2's mode.
  	   Thus, the cc's are set for r2.
  	   This can set N bit spuriously. */
  	cc_status.flags |= CC_NOT_NEGATIVE; 
        }
    if (cc_status.value1 && GET_CODE (cc_status.value1) == REG
        && cc_status.value2
        && reg_overlap_mentioned_p (cc_status.value1, cc_status.value2))
      cc_status.value2 = 0;
    if (((cc_status.value1 && FP_REG_P (cc_status.value1))
         || (cc_status.value2 && FP_REG_P (cc_status.value2)))
        && !((cc_status.value1 && FPA_REG_P (cc_status.value1))
  	   || (cc_status.value2 && FPA_REG_P (cc_status.value2))))
      cc_status.flags = CC_IN_68881;
  }
  
  char *
  output_move_const_double (operands)
       rtx *operands;
  {
  #ifdef SUPPORT_SUN_FPA
    if (TARGET_FPA && FPA_REG_P (operands[0]))
      {
        int code = standard_sun_fpa_constant_p (operands[1]);
  
        if (code != 0)
  	{
  	  static char buf[40];
  
  	  sprintf (buf, "fpmove%%.d %%%%%d,%%0", code & 0x1ff);
  	  return buf;
  	}
        return "fpmove%.d %1,%0";
      }
    else
  #endif
      {
        int code = standard_68881_constant_p (operands[1]);
  
        if (code != 0)
  	{
  	  static char buf[40];
  
  	  sprintf (buf, "fmovecr %%#0x%x,%%0", code & 0xff);
  	  return buf;
  	}
        return "fmove%.d %1,%0";
      }
  }
  
  char *
  output_move_const_single (operands)
       rtx *operands;
  {
  #ifdef SUPPORT_SUN_FPA
    if (TARGET_FPA)
      {
        int code = standard_sun_fpa_constant_p (operands[1]);
  
        if (code != 0)
  	{
  	  static char buf[40];
  
  	  sprintf (buf, "fpmove%%.s %%%%%d,%%0", code & 0x1ff);
  	  return buf;
  	}
        return "fpmove%.s %1,%0";
      }
    else
  #endif /* defined SUPPORT_SUN_FPA */
      {
        int code = standard_68881_constant_p (operands[1]);
  
        if (code != 0)
  	{
  	  static char buf[40];
  
  	  sprintf (buf, "fmovecr %%#0x%x,%%0", code & 0xff);
  	  return buf;
  	}
        return "fmove%.s %f1,%0";
      }
  }
  
  /* Return nonzero if X, a CONST_DOUBLE, has a value that we can get
     from the "fmovecr" instruction.
     The value, anded with 0xff, gives the code to use in fmovecr
     to get the desired constant.  */
  
  /* ??? This code should be fixed for cross-compilation. */
  
  int
  standard_68881_constant_p (x)
       rtx x;
  {
    register double d;
  
    /* fmovecr must be emulated on the 68040, so it shouldn't be used at all. */
    if (TARGET_68040)
      return 0;
  
  #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
    if (! flag_pretend_float)
      return 0;
  #endif
  
    REAL_VALUE_FROM_CONST_DOUBLE (d, x);
  
    if (d == 0)
      return 0x0f;
    /* Note: there are various other constants available
       but it is a nuisance to put in their values here.  */
    if (d == 1)
      return 0x32;
    if (d == 10)
      return 0x33;
    if (d == 100)
      return 0x34;
    if (d == 10000)
      return 0x35;
    if (d == 1e8)
      return 0x36;
    if (GET_MODE (x) == SFmode)
      return 0;
    if (d == 1e16)
      return 0x37;
    /* larger powers of ten in the constants ram are not used
       because they are not equal to a `double' C constant.  */
    return 0;
  }
  
  /* If X is a floating-point constant, return the logarithm of X base 2,
     or 0 if X is not a power of 2.  */
  
  int
  floating_exact_log2 (x)
       rtx x;
  {
    register double d, d1;
    int i;
  
  #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
    if (! flag_pretend_float)
      return 0;
  #endif
  
    REAL_VALUE_FROM_CONST_DOUBLE (d, x);
  
    if (! (d > 0))
      return 0;
  
    for (d1 = 1.0, i = 0; d1 < d; d1 *= 2.0, i++)
      ;
  
    if (d == d1)
      return i;
  
    return 0;
  }
  
  #ifdef SUPPORT_SUN_FPA
  /* Return nonzero if X, a CONST_DOUBLE, has a value that we can get
     from the Sun FPA's constant RAM.
     The value returned, anded with 0x1ff, gives the code to use in fpmove
     to get the desired constant. */
  #define S_E (2.718281745910644531)
  #define D_E (2.718281828459045091)
  #define S_PI (3.141592741012573242)
  #define D_PI (3.141592653589793116)
  #define S_SQRT2 (1.414213538169860840)
  #define D_SQRT2 (1.414213562373095145)
  #define S_LOG2ofE (1.442695021629333496)
  #define D_LOG2ofE (1.442695040888963387)
  #define S_LOG2of10 (3.321928024291992188)
  #define D_LOG2of10 (3.321928024887362182)
  #define S_LOGEof2 (0.6931471824645996094)
  #define D_LOGEof2 (0.6931471805599452862)
  #define S_LOGEof10 (2.302585124969482442)
  #define D_LOGEof10 (2.302585092994045901)
  #define S_LOG10of2 (0.3010300099849700928)
  #define D_LOG10of2 (0.3010299956639811980)
  #define S_LOG10ofE (0.4342944920063018799)
  #define D_LOG10ofE (0.4342944819032518167)
  
  /* This code should be fixed for cross-compilation. */
  
  int
  standard_sun_fpa_constant_p (x)
       rtx x;
  {
    register double d;
  
  #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
    if (! flag_pretend_float)
      return 0;
  #endif
  
    REAL_VALUE_FROM_CONST_DOUBLE (d, x);
  
    if (d == 0.0)
      return 0x200;		/* 0 once 0x1ff is anded with it */
    if (d == 1.0)
      return 0xe;
    if (d == 0.5)
      return 0xf;
    if (d == -1.0)
      return 0x10;
    if (d == 2.0)
      return 0x11;
    if (d == 3.0)
      return 0xB1;
    if (d == 4.0)
      return 0x12;
    if (d == 8.0)
      return 0x13;
    if (d == 0.25)
      return 0x15;
    if (d == 0.125)
      return 0x16;
    if (d == 10.0)
      return 0x17;
    if (d == -(1.0/2.0))
      return 0x2E;
  
  /*
   * Stuff that looks different if it's single or double
   */
    if (GET_MODE (x) == SFmode)
      {
        if (d == S_E)
  	return 0x8;
        if (d == (2*S_PI))
  	return 0x9;
        if (d == S_PI)
  	return 0xA;
        if (d == (S_PI / 2.0))
  	return 0xB;
        if (d == S_SQRT2)
  	return 0xC;
        if (d == (1.0 / S_SQRT2))
  	return 0xD;
        /* Large powers of 10 in the constant 
  	 ram are not used because they are
  	 not equal to a C double constant  */
        if (d == -(S_PI / 2.0))
  	return 0x27;
        if (d == S_LOG2ofE)
  	return 0x28;
        if (d == S_LOG2of10)
  	return 0x29;
        if (d == S_LOGEof2)
  	return 0x2A;
        if (d == S_LOGEof10)
  	return 0x2B;
        if (d == S_LOG10of2)
  	return 0x2C;
        if (d == S_LOG10ofE)
  	return 0x2D;
      }
    else
      {
        if (d == D_E)
  	return 0x8;
        if (d == (2*D_PI))
  	return 0x9;
        if (d == D_PI)
  	return 0xA;
        if (d == (D_PI / 2.0))
  	return 0xB;
        if (d == D_SQRT2)
  	return 0xC;
        if (d == (1.0 / D_SQRT2))
  	return 0xD;
        /* Large powers of 10 in the constant 
  	 ram are not used because they are
  	 not equal to a C double constant  */
        if (d == -(D_PI / 2.0))
  	return 0x27;
        if (d == D_LOG2ofE)
  	return 0x28;
        if (d == D_LOG2of10)
  	return 0x29;
        if (d == D_LOGEof2)
  	return 0x2A;
        if (d == D_LOGEof10)
  	return 0x2B;
        if (d == D_LOG10of2)
  	return 0x2C;
        if (d == D_LOG10ofE)
  	return 0x2D;
      }
    return 0x0;
  }
  #endif /* define SUPPORT_SUN_FPA */
  
  /* A C compound statement to output to stdio stream STREAM the
     assembler syntax for an instruction operand X.  X is an RTL
     expression.
  
     CODE is a value that can be used to specify one of several ways
     of printing the operand.  It is used when identical operands
     must be printed differently depending on the context.  CODE
     comes from the `%' specification that was used to request
     printing of the operand.  If the specification was just `%DIGIT'
     then CODE is 0; if the specification was `%LTR DIGIT' then CODE
     is the ASCII code for LTR.
  
     If X is a register, this macro should print the register's name.
     The names can be found in an array `reg_names' whose type is
     `char *[]'.  `reg_names' is initialized from `REGISTER_NAMES'.
  
     When the machine description has a specification `%PUNCT' (a `%'
     followed by a punctuation character), this macro is called with
     a null pointer for X and the punctuation character for CODE.
  
     The m68k specific codes are:
  
     '.' for dot needed in Motorola-style opcode names.
     '-' for an operand pushing on the stack:
         sp@-, -(sp) or -(%sp) depending on the style of syntax.
     '+' for an operand pushing on the stack:
         sp@+, (sp)+ or (%sp)+ depending on the style of syntax.
     '@' for a reference to the top word on the stack:
         sp@, (sp) or (%sp) depending on the style of syntax.
     '#' for an immediate operand prefix (# in MIT and Motorola syntax
         but & in SGS syntax).
     '!' for the cc register (used in an `and to cc' insn).
     '$' for the letter `s' in an op code, but only on the 68040.
     '&' for the letter `d' in an op code, but only on the 68040.
     '/' for register prefix needed by longlong.h.
  
     'b' for byte insn (no effect, on the Sun; this is for the ISI).
     'd' to force memory addressing to be absolute, not relative.
     'f' for float insn (print a CONST_DOUBLE as a float rather than in hex)
     'w' for FPA insn (print a CONST_DOUBLE as a SunFPA constant rather
         than directly).  Second part of 'y' below.
     'x' for float insn (print a CONST_DOUBLE as a float rather than in hex),
         or print pair of registers as rx:ry.
     'y' for a FPA insn (print pair of registers as rx:ry).  This also outputs
         CONST_DOUBLE's as SunFPA constant RAM registers if
         possible, so it should not be used except for the SunFPA.
  
     */
  
  void
  print_operand (file, op, letter)
       FILE *file;		/* file to write to */
       rtx op;			/* operand to print */
       int letter;		/* %<letter> or 0 */
  {
    int i;
  
    if (letter == '.')
      {
  #ifdef MOTOROLA
        asm_fprintf (file, ".");
  #endif
      }
    else if (letter == '#')
      {
        asm_fprintf (file, "%0I");
      }
    else if (letter == '-')
      {
  #ifdef MOTOROLA
        asm_fprintf (file, "-(%Rsp)");
  #else
        asm_fprintf (file, "%Rsp@-");
  #endif
      }
    else if (letter == '+')
      {
  #ifdef MOTOROLA
        asm_fprintf (file, "(%Rsp)+");
  #else
        asm_fprintf (file, "%Rsp@+");
  #endif
      }
    else if (letter == '@')
      {
  #ifdef MOTOROLA
        asm_fprintf (file, "(%Rsp)");
  #else
        asm_fprintf (file, "%Rsp@");
  #endif
      }
    else if (letter == '!')
      {
        asm_fprintf (file, "%Rfpcr");
      }
    else if (letter == '$')
      {
        if (TARGET_68040_ONLY)
  	{
  	  fprintf (file, "s");
  	}
      }
    else if (letter == '&')
      {
        if (TARGET_68040_ONLY)
  	{
  	  fprintf (file, "d");
  	}
      }
    else if (letter == '/')
      {
        asm_fprintf (file, "%R");
      }
    else if (GET_CODE (op) == REG)
      {
        if (REGNO (op) < 16
  	  && (letter == 'y' || letter == 'x')
  	  && GET_MODE (op) == DFmode)
  	{
  	  fprintf (file, "%s:%s", reg_names[REGNO (op)],
  		   reg_names[REGNO (op)+1]);
  	}
        else
  	{
  	  fprintf (file, "%s", reg_names[REGNO (op)]);
  	}
      }
    else if (GET_CODE (op) == MEM)
      {
        output_address (XEXP (op, 0));
        if (letter == 'd' && ! TARGET_68020
  	  && CONSTANT_ADDRESS_P (XEXP (op, 0))
  	  && !(GET_CODE (XEXP (op, 0)) == CONST_INT
  	       && INTVAL (XEXP (op, 0)) < 0x8000
  	       && INTVAL (XEXP (op, 0)) >= -0x8000))
  	{
  	  fprintf (file, ":l");
  	}
      }
  #ifdef SUPPORT_SUN_FPA
    else if ((letter == 'y' || letter == 'w')
  	   && GET_CODE (op) == CONST_DOUBLE
  	   && (i = standard_sun_fpa_constant_p (op)))
      {
        fprintf (file, "%%%d", i & 0x1ff);
      }
  #endif
    else if (GET_CODE (op) == CONST_DOUBLE && GET_MODE (op) == SFmode)
      {
        double d;
        union { float f; int i; } u1;
        REAL_VALUE_FROM_CONST_DOUBLE (d, op);
        u1.f = d;
        PRINT_OPERAND_PRINT_FLOAT (letter, file);
      }
    else if (GET_CODE (op) == CONST_DOUBLE && GET_MODE (op) != DImode)
      {
        double d;
        REAL_VALUE_FROM_CONST_DOUBLE (d, op);
        ASM_OUTPUT_DOUBLE_OPERAND (file, d);
      }
    else
      {
        asm_fprintf (file, "%0I"); output_addr_const (file, op);
      }
  }
  
  
  /* A C compound statement to output to stdio stream STREAM the
     assembler syntax for an instruction operand that is a memory
     reference whose address is ADDR.  ADDR is an RTL expression.
  
     Note that this contains a kludge that knows that the only reason
     we have an address (plus (label_ref...) (reg...)) when not generating
     PIC code is in the insn before a tablejump, and we know that m68k.md
     generates a label LInnn: on such an insn.
  
     It is possible for PIC to generate a (plus (label_ref...) (reg...))
     and we handle that just like we would a (plus (symbol_ref...) (reg...)).
  
     Some SGS assemblers have a bug such that "Lnnn-LInnn-2.b(pc,d0.l*2)"
     fails to assemble.  Luckily "Lnnn(pc,d0.l*2)" produces the results
     we want.  This difference can be accommodated by using an assembler
     define such "LDnnn" to be either "Lnnn-LInnn-2.b", "Lnnn", or any other
     string, as necessary.  This is accomplished via the ASM_OUTPUT_CASE_END
     macro.  See m68ksgs.h for an example; for versions without the bug.
  
     They also do not like things like "pea 1.w", so we simple leave off
     the .w on small constants. 
  
     This routine is responsible for distinguishing between -fpic and -fPIC 
     style relocations in an address.  When generating -fpic code the
     offset is output in word mode (eg movel a5@(_foo:w), a0).  When generating
     -fPIC code the offset is output in long mode (eg movel a5@(_foo:l), a0) */
  
  void
  print_operand_address (file, addr)
       FILE *file;
       rtx addr;
  {
    register rtx reg1, reg2, breg, ireg;
    rtx offset;
  
    switch (GET_CODE (addr))
      {
        case REG:
  #ifdef MOTOROLA
  	fprintf (file, "(%s)", reg_names[REGNO (addr)]);
  #else
  	fprintf (file, "%s@", reg_names[REGNO (addr)]);
  #endif
  	break;
        case PRE_DEC:
  #ifdef MOTOROLA
  	fprintf (file, "-(%s)", reg_names[REGNO (XEXP (addr, 0))]);
  #else
  	fprintf (file, "%s@-", reg_names[REGNO (XEXP (addr, 0))]);
  #endif
  	break;
        case POST_INC:
  #ifdef MOTOROLA
  	fprintf (file, "(%s)+", reg_names[REGNO (XEXP (addr, 0))]);
  #else
  	fprintf (file, "%s@+", reg_names[REGNO (XEXP (addr, 0))]);
  #endif
  	break;
        case PLUS:
  	reg1 = reg2 = ireg = breg = offset = 0;
  	if (CONSTANT_ADDRESS_P (XEXP (addr, 0)))
  	  {
  	    offset = XEXP (addr, 0);
  	    addr = XEXP (addr, 1);
  	  }
  	else if (CONSTANT_ADDRESS_P (XEXP (addr, 1)))
  	  {
  	    offset = XEXP (addr, 1);
  	    addr = XEXP (addr, 0);
  	  }
  	if (GET_CODE (addr) != PLUS)
  	  {
  	    ;
  	  }
  	else if (GET_CODE (XEXP (addr, 0)) == SIGN_EXTEND)
  	  {
  	    reg1 = XEXP (addr, 0);
  	    addr = XEXP (addr, 1);
  	  }
  	else if (GET_CODE (XEXP (addr, 1)) == SIGN_EXTEND)
  	  {
  	    reg1 = XEXP (addr, 1);
  	    addr = XEXP (addr, 0);
  	  }
  	else if (GET_CODE (XEXP (addr, 0)) == MULT)
  	  {
  	    reg1 = XEXP (addr, 0);
  	    addr = XEXP (addr, 1);
  	  }
  	else if (GET_CODE (XEXP (addr, 1)) == MULT)
  	  {
  	    reg1 = XEXP (addr, 1);
  	    addr = XEXP (addr, 0);
  	  }
  	else if (GET_CODE (XEXP (addr, 0)) == REG)
  	  {
  	    reg1 = XEXP (addr, 0);
  	    addr = XEXP (addr, 1);
  	  }
  	else if (GET_CODE (XEXP (addr, 1)) == REG)
  	  {
  	    reg1 = XEXP (addr, 1);
  	    addr = XEXP (addr, 0);
  	  }
  	if (GET_CODE (addr) == REG || GET_CODE (addr) == MULT
  	    || GET_CODE (addr) == SIGN_EXTEND)
  	  {
  	    if (reg1 == 0)
  	      {
  		reg1 = addr;
  	      }
  	    else
  	      {
  		reg2 = addr;
  	      }
  	    addr = 0;
  	  }
  #if 0	/* for OLD_INDEXING */
  	else if (GET_CODE (addr) == PLUS)
  	  {
  	    if (GET_CODE (XEXP (addr, 0)) == REG)
  	      {
  		reg2 = XEXP (addr, 0);
  		addr = XEXP (addr, 1);
  	      }
  	    else if (GET_CODE (XEXP (addr, 1)) == REG)
  	      {
  		reg2 = XEXP (addr, 1);
  		addr = XEXP (addr, 0);
  	      }
  	  }
  #endif
  	if (offset != 0)
  	  {
  	    if (addr != 0)
  	      {
  		abort ();
  	      }
  	    addr = offset;
  	  }
  	if ((reg1 && (GET_CODE (reg1) == SIGN_EXTEND
  		      || GET_CODE (reg1) == MULT))
  	    || (reg2 != 0 && REGNO_OK_FOR_BASE_P (REGNO (reg2))))
  	  {
  	    breg = reg2;
  	    ireg = reg1;
  	  }
  	else if (reg1 != 0 && REGNO_OK_FOR_BASE_P (REGNO (reg1)))
  	  {
  	    breg = reg1;
  	    ireg = reg2;
  	  }
  	if (ireg != 0 && breg == 0 && GET_CODE (addr) == LABEL_REF
  	    && ! (flag_pic && ireg == pic_offset_table_rtx))
  	  {
  	    int scale = 1;
  	    if (GET_CODE (ireg) == MULT)
  	      {
  		scale = INTVAL (XEXP (ireg, 1));
  		ireg = XEXP (ireg, 0);
  	      }
  	    if (GET_CODE (ireg) == SIGN_EXTEND)
  	      {
  #ifdef MOTOROLA
  #ifdef SGS
  		asm_fprintf (file, "%LLD%d(%Rpc,%s.w",
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     reg_names[REGNO (XEXP (ireg, 0))]);
  #else
  		asm_fprintf (file, "%LL%d-%LLI%d.b(%Rpc,%s.w",
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     reg_names[REGNO (XEXP (ireg, 0))]);
  #endif
  #else
  		asm_fprintf (file, "%Rpc@(%LL%d-%LLI%d-2:b,%s:w",
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     reg_names[REGNO (XEXP (ireg, 0))]);
  #endif
  	      }
  	    else
  	      {
  #ifdef MOTOROLA
  #ifdef SGS
  		asm_fprintf (file, "%LLD%d(%Rpc,%s.l",
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     reg_names[REGNO (ireg)]);
  #else
  		asm_fprintf (file, "%LL%d-%LLI%d.b(%Rpc,%s.l",
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     reg_names[REGNO (ireg)]);
  #endif
  #else
  		asm_fprintf (file, "%Rpc@(%LL%d-%LLI%d-2:b,%s:l",
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			     reg_names[REGNO (ireg)]);
  #endif
  	      }
  	    if (scale != 1)
  	      {
  #ifdef MOTOROLA
  		fprintf (file, "*%d", scale);
  #else
  		fprintf (file, ":%d", scale);
  #endif
  	      }
  	    putc (')', file);
  	    break;
  	  }
  	if (breg != 0 && ireg == 0 && GET_CODE (addr) == LABEL_REF
  	    && ! (flag_pic && breg == pic_offset_table_rtx))
  	  {
  #ifdef MOTOROLA
  #ifdef SGS
  	    asm_fprintf (file, "%LLD%d(%Rpc,%s.l",
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 reg_names[REGNO (breg)]);
  #else
  	    asm_fprintf (file, "%LL%d-%LLI%d.b(%Rpc,%s.l",
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 reg_names[REGNO (breg)]);
  #endif
  #else
  	    asm_fprintf (file, "%Rpc@(%LL%d-%LLI%d-2:b,%s:l",
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 reg_names[REGNO (breg)]);
  #endif
  	    putc (')', file);
  	    break;
  	  }
  	if (ireg != 0 || breg != 0)
  	  {
  	    int scale = 1;
  	    if (breg == 0)
  	      {
  		abort ();
  	      }
  	    if (! flag_pic && addr && GET_CODE (addr) == LABEL_REF)
  	      {
  		abort ();
  	      }
  #ifdef MOTOROLA
  	    if (addr != 0)
  	      {
  		output_addr_const (file, addr);
  	        if ((flag_pic == 1) && (breg == pic_offset_table_rtx))
  	          fprintf (file, ".w");
  	        if ((flag_pic == 2) && (breg == pic_offset_table_rtx))
  	          fprintf (file, ".l");
  	      }
  	    fprintf (file, "(%s", reg_names[REGNO (breg)]);
  	    if (ireg != 0)
  	      {
  		putc (',', file);
  	      }
  #else
  	    fprintf (file, "%s@(", reg_names[REGNO (breg)]);
  	    if (addr != 0)
  	      {
  		output_addr_const (file, addr);
  	        if ((flag_pic == 1) && (breg == pic_offset_table_rtx))
  	          fprintf (file, ":w");
  	        if ((flag_pic == 2) && (breg == pic_offset_table_rtx))
  	          fprintf (file, ":l");
  	      }
  	    if (addr != 0 && ireg != 0)
  	      {
  		putc (',', file);
  	      }
  #endif
  	    if (ireg != 0 && GET_CODE (ireg) == MULT)
  	      {
  		scale = INTVAL (XEXP (ireg, 1));
  		ireg = XEXP (ireg, 0);
  	      }
  	    if (ireg != 0 && GET_CODE (ireg) == SIGN_EXTEND)
  	      {
  #ifdef MOTOROLA
  		fprintf (file, "%s.w", reg_names[REGNO (XEXP (ireg, 0))]);
  #else
  		fprintf (file, "%s:w", reg_names[REGNO (XEXP (ireg, 0))]);
  #endif
  	      }
  	    else if (ireg != 0)
  	      {
  #ifdef MOTOROLA
  		fprintf (file, "%s.l", reg_names[REGNO (ireg)]);
  #else
  		fprintf (file, "%s:l", reg_names[REGNO (ireg)]);
  #endif
  	      }
  	    if (scale != 1)
  	      {
  #ifdef MOTOROLA
  		fprintf (file, "*%d", scale);
  #else
  		fprintf (file, ":%d", scale);
  #endif
  	      }
  	    putc (')', file);
  	    break;
  	  }
  	else if (reg1 != 0 && GET_CODE (addr) == LABEL_REF
  		 && ! (flag_pic && reg1 == pic_offset_table_rtx))	
  	  {
  #ifdef MOTOROLA
  #ifdef SGS
  	    asm_fprintf (file, "%LLD%d(%Rpc,%s.l)",
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 reg_names[REGNO (reg1)]);
  #else
  	    asm_fprintf (file, "%LL%d-%LLI%d.b(%Rpc,%s.l)",
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 reg_names[REGNO (reg1)]);
  #endif
  #else
  	    asm_fprintf (file, "%Rpc@(%LL%d-%LLI%d-2:b,%s:l)",
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 CODE_LABEL_NUMBER (XEXP (addr, 0)),
  			 reg_names[REGNO (reg1)]);
  #endif
  	    break;
  	  }
  	/* FALL-THROUGH (is this really what we want? */
        default:
          if (GET_CODE (addr) == CONST_INT
  	    && INTVAL (addr) < 0x8000
  	    && INTVAL (addr) >= -0x8000)
  	  {
  #ifdef MOTOROLA
  #ifdef SGS
  	    /* Many SGS assemblers croak on size specifiers for constants. */
  	    fprintf (file, "%d", INTVAL (addr));
  #else
  	    fprintf (file, "%d.w", INTVAL (addr));
  #endif
  #else
  	    fprintf (file, "%d:w", INTVAL (addr));
  #endif
  	  }
  	else
  	  {
  	    output_addr_const (file, addr);
  	  }
  	break;
      }
  }
  