path: root/gcc/config/v850/v850.c

/* Subroutines for insn-output.c for NEC V850 series
   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
   Contributed by Jeff Law (law@cygnus.com).

   This file is part of GCC.

   GCC 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 3, or (at your option)
   any later version.

   GCC 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 GCC; see the file COPYING3.  If not see
   <http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "insn-config.h"
#include "conditions.h"
#include "output.h"
#include "insn-attr.h"
#include "flags.h"
#include "recog.h"
#include "expr.h"
#include "function.h"
#include "diagnostic-core.h"
#include "ggc.h"
#include "tm_p.h"
#include "target.h"
#include "target-def.h"
#include "df.h"
#include "opts.h"

#ifndef streq
#define streq(a,b) (strcmp (a, b) == 0)
#endif

static void v850_print_operand_address (FILE *, rtx);

/* Names of the various data areas used on the v850.  */
tree GHS_default_section_names [(int) COUNT_OF_GHS_SECTION_KINDS];
tree GHS_current_section_names [(int) COUNT_OF_GHS_SECTION_KINDS];

/* Track the current data area set by the data area pragma (which 
   can be nested).  Tested by check_default_data_area.  */
data_area_stack_element * data_area_stack = NULL;

/* True if we don't need to check any more if the current
   function is an interrupt handler.  */
static int v850_interrupt_cache_p = FALSE;

rtx v850_compare_op0, v850_compare_op1;

/* Whether current function is an interrupt handler.  */
static int v850_interrupt_p = FALSE;

static GTY(()) section * rosdata_section;
static GTY(()) section * rozdata_section;
static GTY(()) section * tdata_section;
static GTY(()) section * zdata_section;
static GTY(()) section * zbss_section;

/* Handle the TARGET_PASS_BY_REFERENCE target hook.
   Specify whether to pass the argument by reference.  */

static bool
v850_pass_by_reference (cumulative_args_t cum ATTRIBUTE_UNUSED,
			enum machine_mode mode, const_tree type,
			bool named ATTRIBUTE_UNUSED)
{
  unsigned HOST_WIDE_INT size;

  if (type)
    size = int_size_in_bytes (type);
  else
    size = GET_MODE_SIZE (mode);

  return size > 8;
}

/* Implementing the Varargs Macros.  */

static bool
v850_strict_argument_naming (cumulative_args_t ca ATTRIBUTE_UNUSED)
{
  return !TARGET_GHS ? true : false;
}

/* Return an RTX to represent where an argument with mode MODE
   and type TYPE will be passed to a function.  If the result
   is NULL_RTX, the argument will be pushed.  */

static rtx
v850_function_arg (cumulative_args_t cum_v, enum machine_mode mode,
		   const_tree type, bool named)
{
  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
  rtx result = NULL_RTX;
  int size, align;

  if (!named)
    return NULL_RTX;

  if (mode == BLKmode)
    size = int_size_in_bytes (type);
  else
    size = GET_MODE_SIZE (mode);

  size = (size + UNITS_PER_WORD -1) & ~(UNITS_PER_WORD -1);

  if (size < 1)
    {
      /* Once we have stopped using argument registers, do not start up again.  */
      cum->nbytes = 4 * UNITS_PER_WORD;
      return NULL_RTX;
    }

  if (size <= UNITS_PER_WORD && type)
    align = TYPE_ALIGN (type) / BITS_PER_UNIT;
  else
    align = size;

  cum->nbytes = (cum->nbytes + align - 1) &~(align - 1);

  if (cum->nbytes > 4 * UNITS_PER_WORD)
    return NULL_RTX;

  if (type == NULL_TREE
      && cum->nbytes + size > 4 * UNITS_PER_WORD)
    return NULL_RTX;

  switch (cum->nbytes / UNITS_PER_WORD)
    {
    case 0:
      result = gen_rtx_REG (mode, 6);
      break;
    case 1:
      result = gen_rtx_REG (mode, 7);
      break;
    case 2:
      result = gen_rtx_REG (mode, 8);
      break;
    case 3:
      result = gen_rtx_REG (mode, 9);
      break;
    default:
      result = NULL_RTX;
    }

  return result;
}

/* Return the number of bytes which must be put into registers
   for values which are part in registers and part in memory.  */
static int
v850_arg_partial_bytes (cumulative_args_t cum_v, enum machine_mode mode,
                        tree type, bool named)
{
  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
  int size, align;

  if (TARGET_GHS && !named)
    return 0;

  if (mode == BLKmode)
    size = int_size_in_bytes (type);
  else
    size = GET_MODE_SIZE (mode);

  if (size < 1)
    size = 1;
  
  if (type)
    align = TYPE_ALIGN (type) / BITS_PER_UNIT;
  else
    align = size;

  cum->nbytes = (cum->nbytes + align - 1) & ~ (align - 1);

  if (cum->nbytes > 4 * UNITS_PER_WORD)
    return 0;

  if (cum->nbytes + size <= 4 * UNITS_PER_WORD)
    return 0;

  if (type == NULL_TREE
      && cum->nbytes + size > 4 * UNITS_PER_WORD)
    return 0;

  return 4 * UNITS_PER_WORD - cum->nbytes;
}

/* Update the data in CUM to advance over an argument
   of mode MODE and data type TYPE.
   (TYPE is null for libcalls where that information may not be available.)  */

static void
v850_function_arg_advance (cumulative_args_t cum_v, enum machine_mode mode,
			   const_tree type, bool named ATTRIBUTE_UNUSED)
{
  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);

  cum->nbytes += (((type && int_size_in_bytes (type) > 8
		    ? GET_MODE_SIZE (Pmode)
		    : (mode != BLKmode
		       ? GET_MODE_SIZE (mode)
		       : int_size_in_bytes (type))) + UNITS_PER_WORD - 1)
		  & -UNITS_PER_WORD);
}

/* Return the high and low words of a CONST_DOUBLE */

static void
const_double_split (rtx x, HOST_WIDE_INT * p_high, HOST_WIDE_INT * p_low)
{
  if (GET_CODE (x) == CONST_DOUBLE)
    {
      long t[2];
      REAL_VALUE_TYPE rv;

      switch (GET_MODE (x))
	{
	case DFmode:
	  REAL_VALUE_FROM_CONST_DOUBLE (rv, x);
	  REAL_VALUE_TO_TARGET_DOUBLE (rv, t);
	  *p_high = t[1];	/* since v850 is little endian */
	  *p_low = t[0];	/* high is second word */
	  return;

	case SFmode:
	  REAL_VALUE_FROM_CONST_DOUBLE (rv, x);
	  REAL_VALUE_TO_TARGET_SINGLE (rv, *p_high);
	  *p_low = 0;
	  return;

	case VOIDmode:
	case DImode:
	  *p_high = CONST_DOUBLE_HIGH (x);
	  *p_low  = CONST_DOUBLE_LOW (x);
	  return;

	default:
	  break;
	}
    }

  fatal_insn ("const_double_split got a bad insn:", x);
}


/* Return the cost of the rtx R with code CODE.  */

static int
const_costs_int (HOST_WIDE_INT value, int zero_cost)
{
  if (CONST_OK_FOR_I (value))
      return zero_cost;
  else if (CONST_OK_FOR_J (value))
    return 1;
  else if (CONST_OK_FOR_K (value))
    return 2;
  else
    return 4;
}

static int
const_costs (rtx r, enum rtx_code c)
{
  HOST_WIDE_INT high, low;

  switch (c)
    {
    case CONST_INT:
      return const_costs_int (INTVAL (r), 0);

    case CONST_DOUBLE:
      const_double_split (r, &high, &low);
      if (GET_MODE (r) == SFmode)
	return const_costs_int (high, 1);
      else
	return const_costs_int (high, 1) + const_costs_int (low, 1);

    case SYMBOL_REF:
    case LABEL_REF:
    case CONST:
      return 2;

    case HIGH:
      return 1;

    default:
      return 4;
    }
}

static bool
v850_rtx_costs (rtx x,
                int codearg,
                int outer_code ATTRIBUTE_UNUSED,
		int opno ATTRIBUTE_UNUSED,
                int * total, bool speed)
{
  enum rtx_code code = (enum rtx_code) codearg;

  switch (code)
    {
    case CONST_INT:
    case CONST_DOUBLE:
    case CONST:
    case SYMBOL_REF:
    case LABEL_REF:
      *total = COSTS_N_INSNS (const_costs (x, code));
      return true;

    case MOD:
    case DIV:
    case UMOD:
    case UDIV:
      if (TARGET_V850E && !speed)
        *total = 6;
      else
	*total = 60;
      return true;

    case MULT:
      if (TARGET_V850E
	  && (   GET_MODE (x) == SImode
	      || GET_MODE (x) == HImode
	      || GET_MODE (x) == QImode))
        {
	  if (GET_CODE (XEXP (x, 1)) == REG)
	    *total = 4;
	  else if (GET_CODE (XEXP (x, 1)) == CONST_INT)
	    {
	      if (CONST_OK_FOR_O (INTVAL (XEXP (x, 1))))
	        *total = 6;
	      else if (CONST_OK_FOR_K (INTVAL (XEXP (x, 1))))
	        *total = 10;
	    }
        }
      else
	*total = 20;
      return true;

    case ZERO_EXTRACT:
      if (outer_code == COMPARE)
	*total = 0;
      return false;

    default:
      return false;
    }
}

/* Print operand X using operand code CODE to assembly language output file
   FILE.  */

static void
v850_print_operand (FILE * file, rtx x, int code)
{
  HOST_WIDE_INT high, low;

  switch (code)
    {
    case 'c':
      /* We use 'c' operands with symbols for .vtinherit.  */
      if (GET_CODE (x) == SYMBOL_REF)
        {
          output_addr_const(file, x);
          break;
        }
      /* Fall through.  */
    case 'b':
    case 'B':
    case 'C':
      switch ((code == 'B' || code == 'C')
	      ? reverse_condition (GET_CODE (x)) : GET_CODE (x))
	{
	  case NE:
	    if (code == 'c' || code == 'C')
	      fprintf (file, "nz");
	    else
	      fprintf (file, "ne");
	    break;
	  case EQ:
	    if (code == 'c' || code == 'C')
	      fprintf (file, "z");
	    else
	      fprintf (file, "e");
	    break;
	  case GE:
	    fprintf (file, "ge");
	    break;
	  case GT:
	    fprintf (file, "gt");
	    break;
	  case LE:
	    fprintf (file, "le");
	    break;
	  case LT:
	    fprintf (file, "lt");
	    break;
	  case GEU:
	    fprintf (file, "nl");
	    break;
	  case GTU:
	    fprintf (file, "h");
	    break;
	  case LEU:
	    fprintf (file, "nh");
	    break;
	  case LTU:
	    fprintf (file, "l");
	    break;
	  default:
	    gcc_unreachable ();
	}
      break;
    case 'F':			/* High word of CONST_DOUBLE.  */
      switch (GET_CODE (x))
	{
	case CONST_INT:
	  fprintf (file, "%d", (INTVAL (x) >= 0) ? 0 : -1);
	  break;
	  
	case CONST_DOUBLE:
	  const_double_split (x, &high, &low);
	  fprintf (file, "%ld", (long) high);
	  break;

	default:
	  gcc_unreachable ();
	}
      break;
    case 'G':			/* Low word of CONST_DOUBLE.  */
      switch (GET_CODE (x))
	{
	case CONST_INT:
	  fprintf (file, "%ld", (long) INTVAL (x));
	  break;
	  
	case CONST_DOUBLE:
	  const_double_split (x, &high, &low);
	  fprintf (file, "%ld", (long) low);
	  break;

	default:
	  gcc_unreachable ();
	}
      break;
    case 'L':
      fprintf (file, "%d\n", (int)(INTVAL (x) & 0xffff));
      break;
    case 'M':
      fprintf (file, "%d", exact_log2 (INTVAL (x)));
      break;
    case 'O':
      gcc_assert (special_symbolref_operand (x, VOIDmode));
      
      if (GET_CODE (x) == CONST)
	x = XEXP (XEXP (x, 0), 0);
      else
	gcc_assert (GET_CODE (x) == SYMBOL_REF);
      
      if (SYMBOL_REF_ZDA_P (x))
	fprintf (file, "zdaoff");
      else if (SYMBOL_REF_SDA_P (x))
	fprintf (file, "sdaoff");
      else if (SYMBOL_REF_TDA_P (x))
	fprintf (file, "tdaoff");
      else
	gcc_unreachable ();
      break;
    case 'P':
      gcc_assert (special_symbolref_operand (x, VOIDmode));
      output_addr_const (file, x);
      break;
    case 'Q':
      gcc_assert (special_symbolref_operand (x, VOIDmode));
      
      if (GET_CODE (x) == CONST)
	x = XEXP (XEXP (x, 0), 0);
      else
	gcc_assert (GET_CODE (x) == SYMBOL_REF);
      
      if (SYMBOL_REF_ZDA_P (x))
	fprintf (file, "r0");
      else if (SYMBOL_REF_SDA_P (x))
	fprintf (file, "gp");
      else if (SYMBOL_REF_TDA_P (x))
	fprintf (file, "ep");
      else
	gcc_unreachable ();
      break;
    case 'R':		/* 2nd word of a double.  */
      switch (GET_CODE (x))
	{
	case REG:
	  fprintf (file, reg_names[REGNO (x) + 1]);
	  break;
	case MEM:
	  x = XEXP (adjust_address (x, SImode, 4), 0);
	  v850_print_operand_address (file, x);
	  if (GET_CODE (x) == CONST_INT)
	    fprintf (file, "[r0]");
	  break;
	  
	default:
	  break;
	}
      break;
    case 'S':
      {
        /* If it's a reference to a TDA variable, use sst/sld vs. st/ld.  */
        if (GET_CODE (x) == MEM && ep_memory_operand (x, GET_MODE (x), FALSE))
          fputs ("s", file);

        break;
      }
    case 'T':
      {
	/* Like an 'S' operand above, but for unsigned loads only.  */
        if (GET_CODE (x) == MEM && ep_memory_operand (x, GET_MODE (x), TRUE))
          fputs ("s", file);

        break;
      }
    case 'W':			/* Print the instruction suffix.  */
      switch (GET_MODE (x))
	{
	default:
	  gcc_unreachable ();

	case QImode: fputs (".b", file); break;
	case HImode: fputs (".h", file); break;
	case SImode: fputs (".w", file); break;
	case SFmode: fputs (".w", file); break;
	}
      break;
    case '.':			/* Register r0.  */
      fputs (reg_names[0], file);
      break;
    case 'z':			/* Reg or zero.  */
      if (REG_P (x))
	fputs (reg_names[REGNO (x)], file);
      else if ((GET_MODE(x) == SImode
		|| GET_MODE(x) == DFmode
		|| GET_MODE(x) == SFmode)
		&& x == CONST0_RTX(GET_MODE(x)))
      fputs (reg_names[0], file);
      else
	{
	  gcc_assert (x == const0_rtx);
	  fputs (reg_names[0], file);
	}
      break;
    default:
      switch (GET_CODE (x))
	{
	case MEM:
	  if (GET_CODE (XEXP (x, 0)) == CONST_INT)
	    output_address (gen_rtx_PLUS (SImode, gen_rtx_REG (SImode, 0),
					  XEXP (x, 0)));
	  else
	    output_address (XEXP (x, 0));
	  break;

	case REG:
	  fputs (reg_names[REGNO (x)], file);
	  break;
	case SUBREG:
	  fputs (reg_names[subreg_regno (x)], file);
	  break;
	case CONST_INT:
	case SYMBOL_REF:
	case CONST:
	case LABEL_REF:
	case CODE_LABEL:
	  v850_print_operand_address (file, x);
	  break;
	default:
	  gcc_unreachable ();
	}
      break;

    }
}


/* Output assembly language output for the address ADDR to FILE.  */

static void
v850_print_operand_address (FILE * file, rtx addr)
{
  switch (GET_CODE (addr))
    {
    case REG:
      fprintf (file, "0[");
      v850_print_operand (file, addr, 0);
      fprintf (file, "]");
      break;
    case LO_SUM:
      if (GET_CODE (XEXP (addr, 0)) == REG)
	{
	  /* reg,foo */
	  fprintf (file, "lo(");
	  v850_print_operand (file, XEXP (addr, 1), 0);
	  fprintf (file, ")[");
	  v850_print_operand (file, XEXP (addr, 0), 0);
	  fprintf (file, "]");
	}
      break;
    case PLUS:
      if (GET_CODE (XEXP (addr, 0)) == REG
	  || GET_CODE (XEXP (addr, 0)) == SUBREG)
	{
	  /* reg,foo */
	  v850_print_operand (file, XEXP (addr, 1), 0);
	  fprintf (file, "[");
	  v850_print_operand (file, XEXP (addr, 0), 0);
	  fprintf (file, "]");
	}
      else
	{
	  v850_print_operand (file, XEXP (addr, 0), 0);
	  fprintf (file, "+");
	  v850_print_operand (file, XEXP (addr, 1), 0);
	}
      break;
    case SYMBOL_REF:
      {
        const char *off_name = NULL;
        const char *reg_name = NULL;

	if (SYMBOL_REF_ZDA_P (addr))
          {
            off_name = "zdaoff";
            reg_name = "r0";
          }
        else if (SYMBOL_REF_SDA_P (addr))
          {
            off_name = "sdaoff";
            reg_name = "gp";
          }
        else if (SYMBOL_REF_TDA_P (addr))
          {
            off_name = "tdaoff";
            reg_name = "ep";
          }

	if (off_name)
          fprintf (file, "%s(", off_name);
        output_addr_const (file, addr);
	if (reg_name)
          fprintf (file, ")[%s]", reg_name);
      }
      break;
    case CONST:
      if (special_symbolref_operand (addr, VOIDmode))
        {
	  rtx x = XEXP (XEXP (addr, 0), 0);
          const char *off_name;
          const char *reg_name;

          if (SYMBOL_REF_ZDA_P (x))
            {
              off_name = "zdaoff";
              reg_name = "r0";
            }
          else if (SYMBOL_REF_SDA_P (x))
            {
              off_name = "sdaoff";
              reg_name = "gp";
            }
          else if (SYMBOL_REF_TDA_P (x))
            {
              off_name = "tdaoff";
              reg_name = "ep";
            }
          else
            gcc_unreachable ();

          fprintf (file, "%s(", off_name);
          output_addr_const (file, addr);
          fprintf (file, ")[%s]", reg_name);
        }
      else
        output_addr_const (file, addr);
      break;
    default:
      output_addr_const (file, addr);
      break;
    }
}

static bool
v850_print_operand_punct_valid_p (unsigned char code)
{
  return code == '.';
}

/* When assemble_integer is used to emit the offsets for a switch
   table it can encounter (TRUNCATE:HI (MINUS:SI (LABEL_REF:SI) (LABEL_REF:SI))).
   output_addr_const will normally barf at this, but it is OK to omit
   the truncate and just emit the difference of the two labels.  The
   .hword directive will automatically handle the truncation for us.
   
   Returns true if rtx was handled, false otherwise.  */

static bool
v850_output_addr_const_extra (FILE * file, rtx x)
{
  if (GET_CODE (x) != TRUNCATE)
    return false;

  x = XEXP (x, 0);

  /* We must also handle the case where the switch table was passed a
     constant value and so has been collapsed.  In this case the first
     label will have been deleted.  In such a case it is OK to emit
     nothing, since the table will not be used.
     (cf gcc.c-torture/compile/990801-1.c).  */
  if (GET_CODE (x) == MINUS
      && GET_CODE (XEXP (x, 0)) == LABEL_REF
      && GET_CODE (XEXP (XEXP (x, 0), 0)) == CODE_LABEL
      && INSN_DELETED_P (XEXP (XEXP (x, 0), 0)))
    return true;

  output_addr_const (file, x);
  return true;
}

/* Return appropriate code to load up a 1, 2, or 4 integer/floating
   point value.  */

const char *
output_move_single (rtx * operands)
{
  rtx dst = operands[0];
  rtx src = operands[1];

  if (REG_P (dst))
    {
      if (REG_P (src))
	return "mov %1,%0";

      else if (GET_CODE (src) == CONST_INT)
	{
	  HOST_WIDE_INT value = INTVAL (src);

	  if (CONST_OK_FOR_J (value))		/* Signed 5-bit immediate.  */
	    return "mov %1,%0";

	  else if (CONST_OK_FOR_K (value))	/* Signed 16-bit immediate.  */
	    return "movea %1,%.,%0";

	  else if (CONST_OK_FOR_L (value))	/* Upper 16 bits were set.  */
	    return "movhi hi0(%1),%.,%0";

	  /* A random constant.  */
	  else if (TARGET_V850E || TARGET_V850E2_ALL)
	      return "mov %1,%0";
	  else
	    return "movhi hi(%1),%.,%0\n\tmovea lo(%1),%0,%0";
	}

      else if (GET_CODE (src) == CONST_DOUBLE && GET_MODE (src) == SFmode)
	{
	  HOST_WIDE_INT high, low;

	  const_double_split (src, &high, &low);

	  if (CONST_OK_FOR_J (high))		/* Signed 5-bit immediate.  */
	    return "mov %F1,%0";

	  else if (CONST_OK_FOR_K (high))	/* Signed 16-bit immediate.  */
	    return "movea %F1,%.,%0";

	  else if (CONST_OK_FOR_L (high))	/* Upper 16 bits were set.  */
	    return "movhi hi0(%F1),%.,%0";

	  /* A random constant.  */
	else if (TARGET_V850E || TARGET_V850E2_ALL)
	      return "mov %F1,%0";

	  else
	    return "movhi hi(%F1),%.,%0\n\tmovea lo(%F1),%0,%0";
	}

      else if (GET_CODE (src) == MEM)
	return "%S1ld%W1 %1,%0";

      else if (special_symbolref_operand (src, VOIDmode))
	return "movea %O1(%P1),%Q1,%0";

      else if (GET_CODE (src) == LABEL_REF
	       || GET_CODE (src) == SYMBOL_REF
	       || GET_CODE (src) == CONST)
	{
	  if (TARGET_V850E || TARGET_V850E2_ALL) 
	    return "mov hilo(%1),%0";
	  else
	    return "movhi hi(%1),%.,%0\n\tmovea lo(%1),%0,%0";
	}

      else if (GET_CODE (src) == HIGH)
	return "movhi hi(%1),%.,%0";

      else if (GET_CODE (src) == LO_SUM)
	{
	  operands[2] = XEXP (src, 0);
	  operands[3] = XEXP (src, 1);
	  return "movea lo(%3),%2,%0";
	}
    }

  else if (GET_CODE (dst) == MEM)
    {
      if (REG_P (src))
	return "%S0st%W0 %1,%0";

      else if (GET_CODE (src) == CONST_INT && INTVAL (src) == 0)
	return "%S0st%W0 %.,%0";

      else if (GET_CODE (src) == CONST_DOUBLE
	       && CONST0_RTX (GET_MODE (dst)) == src)
	return "%S0st%W0 %.,%0";
    }

  fatal_insn ("output_move_single:", gen_rtx_SET (VOIDmode, dst, src));
  return "";
}

/* Generate comparison code.  */
int
v850_float_z_comparison_operator (rtx op, enum machine_mode mode)
{
  enum rtx_code code = GET_CODE (op);

  if (GET_RTX_CLASS (code) != RTX_COMPARE
      && GET_RTX_CLASS (code) != RTX_COMM_COMPARE)
    return 0;

  if (mode != GET_MODE (op) && mode != VOIDmode)
    return 0;

  if ((GET_CODE (XEXP (op, 0)) != REG
       || REGNO (XEXP (op, 0)) != CC_REGNUM)
      || XEXP (op, 1) != const0_rtx)
    return 0;

  if (GET_MODE (XEXP (op, 0)) == CC_FPU_LTmode)
    return code == LT;
  if (GET_MODE (XEXP (op, 0)) == CC_FPU_LEmode)
    return code == LE;
  if (GET_MODE (XEXP (op, 0)) == CC_FPU_EQmode)
    return code == EQ;

  return 0;
}

int
v850_float_nz_comparison_operator (rtx op, enum machine_mode mode)
{
  enum rtx_code code = GET_CODE (op);

  if (GET_RTX_CLASS (code) != RTX_COMPARE
      && GET_RTX_CLASS (code) != RTX_COMM_COMPARE)
    return 0;

  if (mode != GET_MODE (op) && mode != VOIDmode)
    return 0;

  if ((GET_CODE (XEXP (op, 0)) != REG
       || REGNO (XEXP (op, 0)) != CC_REGNUM)
      || XEXP (op, 1) != const0_rtx)
    return 0;

  if (GET_MODE (XEXP (op, 0)) == CC_FPU_GTmode)
    return code == GT;
  if (GET_MODE (XEXP (op, 0)) == CC_FPU_GEmode)
    return code == GE;
  if (GET_MODE (XEXP (op, 0)) == CC_FPU_NEmode)
    return code == NE;

  return 0;
}

enum machine_mode
v850_select_cc_mode (enum rtx_code cond, rtx op0, rtx op1 ATTRIBUTE_UNUSED)
{
  if (GET_MODE_CLASS (GET_MODE (op0)) == MODE_FLOAT)
    {
      switch (cond)
	{
	case LE:
	  return CC_FPU_LEmode;
	case GE:
	  return CC_FPU_GEmode;
	case LT:
	  return CC_FPU_LTmode;
	case GT:
	  return CC_FPU_GTmode;
	case EQ:
	  return CC_FPU_EQmode;
	case NE:
	  return CC_FPU_NEmode;
	default:
	  abort ();
	}
    }
  return CCmode;
}

enum machine_mode
v850_gen_float_compare (enum rtx_code cond, enum machine_mode mode ATTRIBUTE_UNUSED, rtx op0, rtx op1)
{
  if (GET_MODE(op0) == DFmode)
    {
      switch (cond)
	{
	case LE:
	  emit_insn (gen_cmpdf_le_insn (op0, op1));
	  break;
	case GE:
	  emit_insn (gen_cmpdf_ge_insn (op0, op1));
	  break;
	case LT:
	  emit_insn (gen_cmpdf_lt_insn (op0, op1));
	  break;
	case GT:
	  emit_insn (gen_cmpdf_gt_insn (op0, op1));
	  break;
	case EQ:
	  emit_insn (gen_cmpdf_eq_insn (op0, op1));
	  break;
	case NE:
	  emit_insn (gen_cmpdf_ne_insn (op0, op1));
	  break;
	default:
	  abort ();
	}
    }
  else if (GET_MODE(v850_compare_op0) == SFmode)
    {
      switch (cond)
	{
	case LE:
	  emit_insn (gen_cmpsf_le_insn(op0, op1));
	  break;
	case GE:
	  emit_insn (gen_cmpsf_ge_insn(op0, op1));
	  break;
	case LT:
	  emit_insn (gen_cmpsf_lt_insn(op0, op1));
	  break;
	case GT:
	  emit_insn (gen_cmpsf_gt_insn(op0, op1));
	  break;
	case EQ:
	  emit_insn (gen_cmpsf_eq_insn(op0, op1));
	  break;
	case NE:
	  emit_insn (gen_cmpsf_ne_insn(op0, op1));
	  break;
	default:
	  abort ();
	}
    }
  else
    {
      abort ();
    }

  return v850_select_cc_mode (cond, op0, op1);
}

rtx
v850_gen_compare (enum rtx_code cond, enum machine_mode mode, rtx op0, rtx op1)
{
  if (GET_MODE_CLASS(GET_MODE (op0)) != MODE_FLOAT)
    {
      emit_insn (gen_cmpsi_insn (op0, op1));
      return gen_rtx_fmt_ee (cond, mode, gen_rtx_REG(CCmode, CC_REGNUM), const0_rtx);
    }
  else
    {
      rtx cc_reg;
      mode = v850_gen_float_compare (cond, mode, op0, op1);
      cc_reg = gen_rtx_REG (mode, CC_REGNUM);
      emit_insn (gen_rtx_SET(mode, cc_reg, gen_rtx_REG (mode, FCC_REGNUM)));  

      return gen_rtx_fmt_ee (cond, mode, cc_reg, const0_rtx);
    }
}

/* Return maximum offset supported for a short EP memory reference of mode
   MODE and signedness UNSIGNEDP.  */

static int
ep_memory_offset (enum machine_mode mode, int unsignedp ATTRIBUTE_UNUSED)
{
  int max_offset = 0;

  switch (mode)
    {
    case QImode:
      if (TARGET_SMALL_SLD)
	max_offset = (1 << 4);
      else if ((TARGET_V850E || TARGET_V850E2_ALL)
		&& unsignedp)
	max_offset = (1 << 4);
      else
	max_offset = (1 << 7);
      break;

    case HImode:
      if (TARGET_SMALL_SLD)
	max_offset = (1 << 5);
      else if ((TARGET_V850E || TARGET_V850E2_ALL)
		&& unsignedp)
	max_offset = (1 << 5);
      else
	max_offset = (1 << 8);
      break;

    case SImode:
    case SFmode:
      max_offset = (1 << 8);
      break;
      
    default:
      break;
    }

  return max_offset;
}

/* Return true if OP is a valid short EP memory reference */

int
ep_memory_operand (rtx op, enum machine_mode mode, int unsigned_load)
{
  rtx addr, op0, op1;
  int max_offset;
  int mask;

  /* If we are not using the EP register on a per-function basis
     then do not allow this optimization at all.  This is to
     prevent the use of the SLD/SST instructions which cannot be
     guaranteed to work properly due to a hardware bug.  */
  if (!TARGET_EP)
    return FALSE;

  if (GET_CODE (op) != MEM)
    return FALSE;

  max_offset = ep_memory_offset (mode, unsigned_load);

  mask = GET_MODE_SIZE (mode) - 1;

  addr = XEXP (op, 0);
  if (GET_CODE (addr) == CONST)
    addr = XEXP (addr, 0);

  switch (GET_CODE (addr))
    {
    default:
      break;

    case SYMBOL_REF:
      return SYMBOL_REF_TDA_P (addr);

    case REG:
      return REGNO (addr) == EP_REGNUM;

    case PLUS:
      op0 = XEXP (addr, 0);
      op1 = XEXP (addr, 1);
      if (GET_CODE (op1) == CONST_INT
	  && INTVAL (op1) < max_offset
	  && INTVAL (op1) >= 0
	  && (INTVAL (op1) & mask) == 0)
	{
	  if (GET_CODE (op0) == REG && REGNO (op0) == EP_REGNUM)
	    return TRUE;

	  if (GET_CODE (op0) == SYMBOL_REF && SYMBOL_REF_TDA_P (op0))
	    return TRUE;
	}
      break;
    }

  return FALSE;
}

/* Substitute memory references involving a pointer, to use the ep pointer,
   taking care to save and preserve the ep.  */

static void
substitute_ep_register (rtx first_insn,
                        rtx last_insn,
                        int uses,
                        int regno,
                        rtx * p_r1,
                        rtx * p_ep)
{
  rtx reg = gen_rtx_REG (Pmode, regno);
  rtx insn;

  if (!*p_r1)
    {
      df_set_regs_ever_live (1, true);
      *p_r1 = gen_rtx_REG (Pmode, 1);
      *p_ep = gen_rtx_REG (Pmode, 30);
    }

  if (TARGET_DEBUG)
    fprintf (stderr, "\
Saved %d bytes (%d uses of register %s) in function %s, starting as insn %d, ending at %d\n",
	     2 * (uses - 3), uses, reg_names[regno],
	     IDENTIFIER_POINTER (DECL_NAME (current_function_decl)),
	     INSN_UID (first_insn), INSN_UID (last_insn));

  if (GET_CODE (first_insn) == NOTE)
    first_insn = next_nonnote_insn (first_insn);

  last_insn = next_nonnote_insn (last_insn);
  for (insn = first_insn; insn && insn != last_insn; insn = NEXT_INSN (insn))
    {
      if (GET_CODE (insn) == INSN)
	{
	  rtx pattern = single_set (insn);

	  /* Replace the memory references.  */
	  if (pattern)
	    {
	      rtx *p_mem;
	      /* Memory operands are signed by default.  */
	      int unsignedp = FALSE;

	      if (GET_CODE (SET_DEST (pattern)) == MEM
		  && GET_CODE (SET_SRC (pattern)) == MEM)
		p_mem = (rtx *)0;

	      else if (GET_CODE (SET_DEST (pattern)) == MEM)
		p_mem = &SET_DEST (pattern);

	      else if (GET_CODE (SET_SRC (pattern)) == MEM)
		p_mem = &SET_SRC (pattern);

	      else if (GET_CODE (SET_SRC (pattern)) == SIGN_EXTEND
		       && GET_CODE (XEXP (SET_SRC (pattern), 0)) == MEM)
		p_mem = &XEXP (SET_SRC (pattern), 0);

	      else if (GET_CODE (SET_SRC (pattern)) == ZERO_EXTEND
		       && GET_CODE (XEXP (SET_SRC (pattern), 0)) == MEM)
		{
		  p_mem = &XEXP (SET_SRC (pattern), 0);
		  unsignedp = TRUE;
		}
	      else
		p_mem = (rtx *)0;

	      if (p_mem)
		{
		  rtx addr = XEXP (*p_mem, 0);

		  if (GET_CODE (addr) == REG && REGNO (addr) == (unsigned) regno)
		    *p_mem = change_address (*p_mem, VOIDmode, *p_ep);

		  else if (GET_CODE (addr) == PLUS
			   && GET_CODE (XEXP (addr, 0)) == REG
			   && REGNO (XEXP (addr, 0)) == (unsigned) regno
			   && GET_CODE (XEXP (addr, 1)) == CONST_INT
			   && ((INTVAL (XEXP (addr, 1)))
			       < ep_memory_offset (GET_MODE (*p_mem),
						   unsignedp))
			   && ((INTVAL (XEXP (addr, 1))) >= 0))
		    *p_mem = change_address (*p_mem, VOIDmode,
					     gen_rtx_PLUS (Pmode,
							   *p_ep,
							   XEXP (addr, 1)));
		}
	    }
	}
    }

  /* Optimize back to back cases of ep <- r1 & r1 <- ep.  */
  insn = prev_nonnote_insn (first_insn);
  if (insn && GET_CODE (insn) == INSN
      && GET_CODE (PATTERN (insn)) == SET
      && SET_DEST (PATTERN (insn)) == *p_ep
      && SET_SRC (PATTERN (insn)) == *p_r1)
    delete_insn (insn);
  else
    emit_insn_before (gen_rtx_SET (Pmode, *p_r1, *p_ep), first_insn);

  emit_insn_before (gen_rtx_SET (Pmode, *p_ep, reg), first_insn);
  emit_insn_before (gen_rtx_SET (Pmode, *p_ep, *p_r1), last_insn);
}


/* TARGET_MACHINE_DEPENDENT_REORG.  On the 850, we use it to implement
   the -mep mode to copy heavily used pointers to ep to use the implicit
   addressing.  */

static void
v850_reorg (void)
{
  struct
  {
    int uses;
    rtx first_insn;
    rtx last_insn;
  }
  regs[FIRST_PSEUDO_REGISTER];

  int i;
  int use_ep = FALSE;
  rtx r1 = NULL_RTX;
  rtx ep = NULL_RTX;
  rtx insn;
  rtx pattern;

  /* If not ep mode, just return now.  */
  if (!TARGET_EP)
    return;

  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
    {
      regs[i].uses = 0;
      regs[i].first_insn = NULL_RTX;
      regs[i].last_insn = NULL_RTX;
    }

  for (insn = get_insns (); insn != NULL_RTX; insn = NEXT_INSN (insn))
    {
      switch (GET_CODE (insn))
	{
	  /* End of basic block */
	default:
	  if (!use_ep)
	    {
	      int max_uses = -1;
	      int max_regno = -1;

	      for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
		{
		  if (max_uses < regs[i].uses)
		    {
		      max_uses = regs[i].uses;
		      max_regno = i;
		    }
		}

	      if (max_uses > 3)
		substitute_ep_register (regs[max_regno].first_insn,
					regs[max_regno].last_insn,
					max_uses, max_regno, &r1, &ep);
	    }

	  use_ep = FALSE;
	  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
	    {
	      regs[i].uses = 0;
	      regs[i].first_insn = NULL_RTX;
	      regs[i].last_insn = NULL_RTX;
	    }
	  break;

	case NOTE:
	  break;

	case INSN:
	  pattern = single_set (insn);

	  /* See if there are any memory references we can shorten */
	  if (pattern)
	    {
	      rtx src = SET_SRC (pattern);
	      rtx dest = SET_DEST (pattern);
	      rtx mem;
	      /* Memory operands are signed by default.  */
	      int unsignedp = FALSE;

	      /* We might have (SUBREG (MEM)) here, so just get rid of the
		 subregs to make this code simpler.  */
	      if (GET_CODE (dest) == SUBREG
		  && (GET_CODE (SUBREG_REG (dest)) == MEM
		      || GET_CODE (SUBREG_REG (dest)) == REG))
		alter_subreg (&dest);
	      if (GET_CODE (src) == SUBREG
		  && (GET_CODE (SUBREG_REG (src)) == MEM
		      || GET_CODE (SUBREG_REG (src)) == REG))
		alter_subreg (&src);

	      if (GET_CODE (dest) == MEM && GET_CODE (src) == MEM)
		mem = NULL_RTX;

	      else if (GET_CODE (dest) == MEM)
		mem = dest;

	      else if (GET_CODE (src) == MEM)
		mem = src;

	      else if (GET_CODE (src) == SIGN_EXTEND
		       && GET_CODE (XEXP (src, 0)) == MEM)
		mem = XEXP (src, 0);

	      else if (GET_CODE (src) == ZERO_EXTEND
		       && GET_CODE (XEXP (src, 0)) == MEM)
		{
		  mem = XEXP (src, 0);
		  unsignedp = TRUE;
		}
	      else
		mem = NULL_RTX;

	      if (mem && ep_memory_operand (mem, GET_MODE (mem), unsignedp))
		use_ep = TRUE;

	      else if (!use_ep && mem
		       && GET_MODE_SIZE (GET_MODE (mem)) <= UNITS_PER_WORD)
		{
		  rtx addr = XEXP (mem, 0);
		  int regno = -1;
		  int short_p;

		  if (GET_CODE (addr) == REG)
		    {
		      short_p = TRUE;
		      regno = REGNO (addr);
		    }

		  else if (GET_CODE (addr) == PLUS
			   && GET_CODE (XEXP (addr, 0)) == REG
			   && GET_CODE (XEXP (addr, 1)) == CONST_INT
			   && ((INTVAL (XEXP (addr, 1)))
			       < ep_memory_offset (GET_MODE (mem), unsignedp))
			   && ((INTVAL (XEXP (addr, 1))) >= 0))
		    {
		      short_p = TRUE;
		      regno = REGNO (XEXP (addr, 0));
		    }

		  else
		    short_p = FALSE;

		  if (short_p)
		    {
		      regs[regno].uses++;
		      regs[regno].last_insn = insn;
		      if (!regs[regno].first_insn)
			regs[regno].first_insn = insn;
		    }
		}

	      /* Loading up a register in the basic block zaps any savings
		 for the register */
	      if (GET_CODE (dest) == REG)
		{
		  enum machine_mode mode = GET_MODE (dest);
		  int regno;
		  int endregno;

		  regno = REGNO (dest);
		  endregno = regno + HARD_REGNO_NREGS (regno, mode);

		  if (!use_ep)
		    {
		      /* See if we can use the pointer before this
			 modification.  */
		      int max_uses = -1;
		      int max_regno = -1;

		      for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
			{
			  if (max_uses < regs[i].uses)
			    {
			      max_uses = regs[i].uses;
			      max_regno = i;
			    }
			}

		      if (max_uses > 3
			  && max_regno >= regno
			  && max_regno < endregno)
			{
			  substitute_ep_register (regs[max_regno].first_insn,
						  regs[max_regno].last_insn,
						  max_uses, max_regno, &r1,
						  &ep);

			  /* Since we made a substitution, zap all remembered
			     registers.  */
			  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
			    {
			      regs[i].uses = 0;
			      regs[i].first_insn = NULL_RTX;
			      regs[i].last_insn = NULL_RTX;
			    }
			}
		    }

		  for (i = regno; i < endregno; i++)
		    {
		      regs[i].uses = 0;
		      regs[i].first_insn = NULL_RTX;
		      regs[i].last_insn = NULL_RTX;
		    }
		}
	    }
	}
    }
}

/* # of registers saved by the interrupt handler.  */
#define INTERRUPT_FIXED_NUM 5

/* # of bytes for registers saved by the interrupt handler.  */
#define INTERRUPT_FIXED_SAVE_SIZE (4 * INTERRUPT_FIXED_NUM)

/* # of words saved for other registers.  */
#define INTERRUPT_ALL_SAVE_NUM \
  (30 - INTERRUPT_FIXED_NUM)

#define INTERRUPT_ALL_SAVE_SIZE (4 * INTERRUPT_ALL_SAVE_NUM)

int
compute_register_save_size (long * p_reg_saved)
{
  int size = 0;
  int i;
  int interrupt_handler = v850_interrupt_function_p (current_function_decl);
  int call_p = df_regs_ever_live_p (LINK_POINTER_REGNUM);
  long reg_saved = 0;

  /* Always save the link pointer - we cannot rely upon df_regs_ever_live_p.  */
  if (!call_p)
    {
      df_set_regs_ever_live (LINK_POINTER_REGNUM, true);
      call_p = 1;
    }

  /* Count space for the register saves.  */
  if (interrupt_handler)
    {
      for (i = 0; i <= 31; i++)
	switch (i)
	  {
	  default:
	    if (df_regs_ever_live_p (i) || call_p)
	      {
		size += 4;
		reg_saved |= 1L << i;
	      }
	    break;

	    /* We don't save/restore r0 or the stack pointer */
	  case 0:
	  case STACK_POINTER_REGNUM:
	    break;

	    /* For registers with fixed use, we save them, set them to the
	       appropriate value, and then restore them.
	       These registers are handled specially, so don't list them
	       on the list of registers to save in the prologue.  */
	  case 1:		/* temp used to hold ep */
	  case 4:		/* gp */
	  case 10:		/* temp used to call interrupt save/restore */
	  case 11:		/* temp used to call interrupt save/restore (long call) */
	  case EP_REGNUM:	/* ep */
	    size += 4;
	    break;
	  }
    }
  else
    {
      /* Find the first register that needs to be saved.  */
      for (i = 0; i <= 31; i++)
	if (df_regs_ever_live_p (i) && ((! call_used_regs[i])
				  || i == LINK_POINTER_REGNUM))
	  break;

      /* If it is possible that an out-of-line helper function might be
	 used to generate the prologue for the current function, then we
	 need to cover the possibility that such a helper function will
	 be used, despite the fact that there might be gaps in the list of
	 registers that need to be saved.  To detect this we note that the
	 helper functions always push at least register r29 (provided
	 that the function is not an interrupt handler).  */
	 
      if (TARGET_PROLOG_FUNCTION
          && (i == 2 || ((i >= 20) && (i < 30))))
	{
	  if (i == 2)
	    {
	      size += 4;
	      reg_saved |= 1L << i;

	      i = 20;
	    }

	  /* Helper functions save all registers between the starting
	     register and the last register, regardless of whether they
	     are actually used by the function or not.  */
	  for (; i <= 29; i++)
	    {
	      size += 4;
	      reg_saved |= 1L << i;
	    }

	  if (df_regs_ever_live_p (LINK_POINTER_REGNUM))
	    {
	      size += 4;
	      reg_saved |= 1L << LINK_POINTER_REGNUM;
	    }
	}
      else
	{
	  for (; i <= 31; i++)
	    if (df_regs_ever_live_p (i) && ((! call_used_regs[i])
				      || i == LINK_POINTER_REGNUM))
	      {
		size += 4;
		reg_saved |= 1L << i;
	      }
	}
    }
  
  if (p_reg_saved)
    *p_reg_saved = reg_saved;

  return size;
}

int
compute_frame_size (int size, long * p_reg_saved)
{
  return (size
	  + compute_register_save_size (p_reg_saved)
	  + crtl->outgoing_args_size);
}

static int
use_prolog_function (int num_save, int frame_size)
{
  int alloc_stack = (4 * num_save);
  int unalloc_stack = frame_size - alloc_stack;
  int save_func_len, restore_func_len;
  int save_normal_len, restore_normal_len;

  if (! TARGET_DISABLE_CALLT)
      save_func_len = restore_func_len = 2;
  else
      save_func_len = restore_func_len = TARGET_LONG_CALLS ? (4+4+4+2+2) : 4;

  if (unalloc_stack)
    {
      save_func_len += CONST_OK_FOR_J (-unalloc_stack) ? 2 : 4;
      restore_func_len += CONST_OK_FOR_J (-unalloc_stack) ? 2 : 4;
    }

  /* See if we would have used ep to save the stack.  */
  if (TARGET_EP && num_save > 3 && (unsigned)frame_size < 255)
    save_normal_len = restore_normal_len = (3 * 2) + (2 * num_save);
  else
    save_normal_len = restore_normal_len = 4 * num_save;

  save_normal_len += CONST_OK_FOR_J (-frame_size) ? 2 : 4;
  restore_normal_len += (CONST_OK_FOR_J (frame_size) ? 2 : 4) + 2;

  /* Don't bother checking if we don't actually save any space.
     This happens for instance if one register is saved and additional
     stack space is allocated.  */
  return ((save_func_len + restore_func_len) < (save_normal_len + restore_normal_len));
}

static void
increment_stack (unsigned int amount)
{
  rtx inc;

  if (amount == 0)
    return;

  inc = GEN_INT (amount);

  if (! CONST_OK_FOR_K (amount))
    {
      rtx reg = gen_rtx_REG (Pmode, 12);

      emit_move_insn (reg, inc);
      inc = reg;
    }

  emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, inc));
}

void
expand_prologue (void)
{
  unsigned int i;
  unsigned int size = get_frame_size ();
  unsigned int actual_fsize;
  unsigned int init_stack_alloc = 0;
  rtx save_regs[32];
  rtx save_all;
  unsigned int num_save;
  int code;
  int interrupt_handler = v850_interrupt_function_p (current_function_decl);
  long reg_saved = 0;

  actual_fsize = compute_frame_size (size, &reg_saved);

  if (flag_stack_usage_info)
    current_function_static_stack_size = actual_fsize;

  /* Save/setup global registers for interrupt functions right now.  */
  if (interrupt_handler)
    {
      if (! TARGET_DISABLE_CALLT && (TARGET_V850E || TARGET_V850E2_ALL))
	emit_insn (gen_callt_save_interrupt ());
      else
	emit_insn (gen_save_interrupt ());

      actual_fsize -= INTERRUPT_FIXED_SAVE_SIZE;
      
      if (((1L << LINK_POINTER_REGNUM) & reg_saved) != 0)
	actual_fsize -= INTERRUPT_ALL_SAVE_SIZE;
    }

  /* Identify all of the saved registers.  */
  num_save = 0;
  for (i = 1; i < 32; i++)
    {
      if (((1L << i) & reg_saved) != 0)
	save_regs[num_save++] = gen_rtx_REG (Pmode, i);
    }

  /* See if we have an insn that allocates stack space and saves the particular
     registers we want to.  */
  save_all = NULL_RTX;
  if (TARGET_PROLOG_FUNCTION && num_save > 0)
    {
      if (use_prolog_function (num_save, actual_fsize))
	{
	  int alloc_stack = 4 * num_save;
	  int offset = 0;

	  save_all = gen_rtx_PARALLEL
	    (VOIDmode,
	     rtvec_alloc (num_save + 1
			  + (TARGET_DISABLE_CALLT ? (TARGET_LONG_CALLS ? 2 : 1) : 0)));

	  XVECEXP (save_all, 0, 0)
	    = gen_rtx_SET (VOIDmode,
			   stack_pointer_rtx,
			   gen_rtx_PLUS (Pmode,
					 stack_pointer_rtx,
					 GEN_INT(-alloc_stack)));
	  for (i = 0; i < num_save; i++)
	    {
	      offset -= 4;
	      XVECEXP (save_all, 0, i+1)
		= gen_rtx_SET (VOIDmode,
			       gen_rtx_MEM (Pmode,
					    gen_rtx_PLUS (Pmode,
							  stack_pointer_rtx,
							  GEN_INT(offset))),
			       save_regs[i]);
	    }

	  if (TARGET_DISABLE_CALLT)
	    {
	      XVECEXP (save_all, 0, num_save + 1)
		= gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, 10));

	      if (TARGET_LONG_CALLS)
		XVECEXP (save_all, 0, num_save + 2)
		  = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, 11));
	    }

	  code = recog (save_all, NULL_RTX, NULL);
	  if (code >= 0)
	    {
	      rtx insn = emit_insn (save_all);
	      INSN_CODE (insn) = code;
	      actual_fsize -= alloc_stack;
	      
	    }
	  else
	    save_all = NULL_RTX;
	}
    }

  /* If no prolog save function is available, store the registers the old
     fashioned way (one by one).  */
  if (!save_all)
    {
      /* Special case interrupt functions that save all registers for a call.  */
      if (interrupt_handler && ((1L << LINK_POINTER_REGNUM) & reg_saved) != 0)
	{
	  if (! TARGET_DISABLE_CALLT && (TARGET_V850E || TARGET_V850E2_ALL))
	    emit_insn (gen_callt_save_all_interrupt ());
	  else
	    emit_insn (gen_save_all_interrupt ());
	}
      else
	{
	  int offset;
	  /* If the stack is too big, allocate it in chunks so we can do the
	     register saves.  We use the register save size so we use the ep
	     register.  */
	  if (actual_fsize && !CONST_OK_FOR_K (-actual_fsize))
	    init_stack_alloc = compute_register_save_size (NULL);
	  else
	    init_stack_alloc = actual_fsize;
	      
	  /* Save registers at the beginning of the stack frame.  */
	  offset = init_stack_alloc - 4;
	  
	  if (init_stack_alloc)
	    increment_stack (- (signed) init_stack_alloc);
	  
	  /* Save the return pointer first.  */
	  if (num_save > 0 && REGNO (save_regs[num_save-1]) == LINK_POINTER_REGNUM)
	    {
	      emit_move_insn (gen_rtx_MEM (SImode,
					   plus_constant (Pmode,
							  stack_pointer_rtx,
							  offset)),
			      save_regs[--num_save]);
	      offset -= 4;
	    }
	  
	  for (i = 0; i < num_save; i++)
	    {
	      emit_move_insn (gen_rtx_MEM (SImode,
					   plus_constant (Pmode,
							  stack_pointer_rtx,
							  offset)),
			      save_regs[i]);
	      offset -= 4;
	    }
	}
    }

  /* Allocate the rest of the stack that was not allocated above (either it is
     > 32K or we just called a function to save the registers and needed more
     stack.  */
  if (actual_fsize > init_stack_alloc)
    {
      int diff = actual_fsize - init_stack_alloc;

      increment_stack (- diff);
    }

  /* If we need a frame pointer, set it up now.  */
  if (frame_pointer_needed)
    emit_move_insn (hard_frame_pointer_rtx, stack_pointer_rtx);
}


void
expand_epilogue (void)
{
  unsigned int i;
  unsigned int size = get_frame_size ();
  long reg_saved = 0;
  int actual_fsize = compute_frame_size (size, &reg_saved);
  rtx restore_regs[32];
  rtx restore_all;
  unsigned int num_restore;
  int code;
  int interrupt_handler = v850_interrupt_function_p (current_function_decl);

  /* Eliminate the initial stack stored by interrupt functions.  */
  if (interrupt_handler)
    {
      actual_fsize -= INTERRUPT_FIXED_SAVE_SIZE;
      if (((1L << LINK_POINTER_REGNUM) & reg_saved) != 0)
	actual_fsize -= INTERRUPT_ALL_SAVE_SIZE;
    }

  /* Cut off any dynamic stack created.  */
  if (frame_pointer_needed)
    emit_move_insn (stack_pointer_rtx, hard_frame_pointer_rtx);

  /* Identify all of the saved registers.  */
  num_restore = 0;
  for (i = 1; i < 32; i++)
    {
      if (((1L << i) & reg_saved) != 0)
	restore_regs[num_restore++] = gen_rtx_REG (Pmode, i);
    }

  /* See if we have an insn that restores the particular registers we
     want to.  */
  restore_all = NULL_RTX;

  if (TARGET_PROLOG_FUNCTION
      && num_restore > 0
      && !interrupt_handler)
    {
      int alloc_stack = (4 * num_restore);

      /* Don't bother checking if we don't actually save any space.  */
      if (use_prolog_function (num_restore, actual_fsize))
	{
	  int offset;
	  restore_all = gen_rtx_PARALLEL (VOIDmode,
					  rtvec_alloc (num_restore + 2));
	  XVECEXP (restore_all, 0, 0) = ret_rtx;
	  XVECEXP (restore_all, 0, 1)
	    = gen_rtx_SET (VOIDmode, stack_pointer_rtx,
			    gen_rtx_PLUS (Pmode,
					  stack_pointer_rtx,
					  GEN_INT (alloc_stack)));

	  offset = alloc_stack - 4;
	  for (i = 0; i < num_restore; i++)
	    {
	      XVECEXP (restore_all, 0, i+2)
		= gen_rtx_SET (VOIDmode,
			       restore_regs[i],
			       gen_rtx_MEM (Pmode,
                                            gen_rtx_PLUS (Pmode,
                                                          stack_pointer_rtx,
                                                          GEN_INT(offset))));
	      offset -= 4;
	    }

	  code = recog (restore_all, NULL_RTX, NULL);
	  
	  if (code >= 0)
	    {
	      rtx insn;

	      actual_fsize -= alloc_stack;
	      increment_stack (actual_fsize);

	      insn = emit_jump_insn (restore_all);
	      INSN_CODE (insn) = code;
	    }
	  else
	    restore_all = NULL_RTX;
	}
    }

  /* If no epilogue save function is available, restore the registers the
     old fashioned way (one by one).  */
  if (!restore_all)
    {
      unsigned int init_stack_free;

      /* If the stack is large, we need to cut it down in 2 pieces.  */
      if (interrupt_handler)
       init_stack_free = 0;
      else if (actual_fsize && !CONST_OK_FOR_K (-actual_fsize))
	init_stack_free = 4 * num_restore;
      else
	init_stack_free = (signed) actual_fsize;

      /* Deallocate the rest of the stack if it is > 32K.  */
      if ((unsigned int) actual_fsize > init_stack_free)
	increment_stack (actual_fsize - init_stack_free);

      /* Special case interrupt functions that save all registers
	 for a call.  */
      if (interrupt_handler && ((1L << LINK_POINTER_REGNUM) & reg_saved) != 0)
	{
	  if (! TARGET_DISABLE_CALLT)
	    emit_insn (gen_callt_restore_all_interrupt ());
	  else
	    emit_insn (gen_restore_all_interrupt ());
	}
      else
	{
	  /* Restore registers from the beginning of the stack frame.  */
	  int offset = init_stack_free - 4;

	  /* Restore the return pointer first.  */
	  if (num_restore > 0
	      && REGNO (restore_regs [num_restore - 1]) == LINK_POINTER_REGNUM)
	    {
	      emit_move_insn (restore_regs[--num_restore],
			      gen_rtx_MEM (SImode,
					   plus_constant (Pmode,
							  stack_pointer_rtx,
							  offset)));
	      offset -= 4;
	    }

	  for (i = 0; i < num_restore; i++)
	    {
	      emit_move_insn (restore_regs[i],
			      gen_rtx_MEM (SImode,
					   plus_constant (Pmode,
							  stack_pointer_rtx,
							  offset)));

	      emit_use (restore_regs[i]);
	      offset -= 4;
	    }

	  /* Cut back the remainder of the stack.  */
	  increment_stack (init_stack_free);
	}

      /* And return or use reti for interrupt handlers.  */
      if (interrupt_handler)
        {
          if (! TARGET_DISABLE_CALLT && (TARGET_V850E || TARGET_V850E2_ALL))
            emit_insn (gen_callt_return_interrupt ());
          else
            emit_jump_insn (gen_return_interrupt ());
	 }
      else if (actual_fsize)
	emit_jump_insn (gen_return_internal ());
      else
	emit_jump_insn (gen_return_simple ());
    }

  v850_interrupt_cache_p = FALSE;
  v850_interrupt_p = FALSE;
}

/* Update the condition code from the insn.  */
void
notice_update_cc (rtx body, rtx insn)
{
  switch (get_attr_cc (insn))
    {
    case CC_NONE:
      /* Insn does not affect CC at all.  */
      break;

    case CC_NONE_0HIT:
      /* Insn does not change CC, but the 0'th operand has been changed.  */
      if (cc_status.value1 != 0
	  && reg_overlap_mentioned_p (recog_data.operand[0], cc_status.value1))
	cc_status.value1 = 0;
      break;

    case CC_SET_ZN:
      /* Insn sets the Z,N flags of CC to recog_data.operand[0].
	 V,C is in an unusable state.  */
      CC_STATUS_INIT;
      cc_status.flags |= CC_OVERFLOW_UNUSABLE | CC_NO_CARRY;
      cc_status.value1 = recog_data.operand[0];
      break;

    case CC_SET_ZNV:
      /* Insn sets the Z,N,V flags of CC to recog_data.operand[0].
  	 C is in an unusable state.  */
      CC_STATUS_INIT;
      cc_status.flags |= CC_NO_CARRY;
      cc_status.value1 = recog_data.operand[0];
      break;

    case CC_COMPARE:
      /* The insn is a compare instruction.  */
      CC_STATUS_INIT;
      cc_status.value1 = SET_SRC (body);
      break;

    case CC_CLOBBER:
      /* Insn doesn't leave CC in a usable state.  */
      CC_STATUS_INIT;
      break;

    default:
      break;
    }
}

/* Retrieve the data area that has been chosen for the given decl.  */

v850_data_area
v850_get_data_area (tree decl)
{
  if (lookup_attribute ("sda", DECL_ATTRIBUTES (decl)) != NULL_TREE)
    return DATA_AREA_SDA;
  
  if (lookup_attribute ("tda", DECL_ATTRIBUTES (decl)) != NULL_TREE)
    return DATA_AREA_TDA;
  
  if (lookup_attribute ("zda", DECL_ATTRIBUTES (decl)) != NULL_TREE)
    return DATA_AREA_ZDA;

  return DATA_AREA_NORMAL;
}

/* Store the indicated data area in the decl's attributes.  */

static void
v850_set_data_area (tree decl, v850_data_area data_area)
{
  tree name;
  
  switch (data_area)
    {
    case DATA_AREA_SDA: name = get_identifier ("sda"); break;
    case DATA_AREA_TDA: name = get_identifier ("tda"); break;
    case DATA_AREA_ZDA: name = get_identifier ("zda"); break;
    default:
      return;
    }

  DECL_ATTRIBUTES (decl) = tree_cons
    (name, NULL, DECL_ATTRIBUTES (decl));
}

/* Handle an "interrupt" attribute; arguments as in
   struct attribute_spec.handler.  */
static tree
v850_handle_interrupt_attribute (tree * node,
                                 tree name,
                                 tree args ATTRIBUTE_UNUSED,
                                 int flags ATTRIBUTE_UNUSED,
                                 bool * no_add_attrs)
{
  if (TREE_CODE (*node) != FUNCTION_DECL)
    {
      warning (OPT_Wattributes, "%qE attribute only applies to functions",
	       name);
      *no_add_attrs = true;
    }

  return NULL_TREE;
}

/* Handle a "sda", "tda" or "zda" attribute; arguments as in
   struct attribute_spec.handler.  */
static tree
v850_handle_data_area_attribute (tree* node,
                                 tree name,
                                 tree args ATTRIBUTE_UNUSED,
                                 int flags ATTRIBUTE_UNUSED,
                                 bool * no_add_attrs)
{
  v850_data_area data_area;
  v850_data_area area;
  tree decl = *node;

  /* Implement data area attribute.  */
  if (is_attribute_p ("sda", name))
    data_area = DATA_AREA_SDA;
  else if (is_attribute_p ("tda", name))
    data_area = DATA_AREA_TDA;
  else if (is_attribute_p ("zda", name))
    data_area = DATA_AREA_ZDA;
  else
    gcc_unreachable ();
  
  switch (TREE_CODE (decl))
    {
    case VAR_DECL:
      if (current_function_decl != NULL_TREE)
	{
          error_at (DECL_SOURCE_LOCATION (decl),
		    "data area attributes cannot be specified for "
		    "local variables");
	  *no_add_attrs = true;
	}

      /* Drop through.  */

    case FUNCTION_DECL:
      area = v850_get_data_area (decl);
      if (area != DATA_AREA_NORMAL && data_area != area)
	{
	  error ("data area of %q+D conflicts with previous declaration",
                 decl);
	  *no_add_attrs = true;
	}
      break;
      
    default:
      break;
    }

  return NULL_TREE;
}


/* Return nonzero if FUNC is an interrupt function as specified
   by the "interrupt" attribute.  */

int
v850_interrupt_function_p (tree func)
{
  tree a;
  int ret = 0;

  if (v850_interrupt_cache_p)
    return v850_interrupt_p;

  if (TREE_CODE (func) != FUNCTION_DECL)
    return 0;

  a = lookup_attribute ("interrupt_handler", DECL_ATTRIBUTES (func));
  if (a != NULL_TREE)
    ret = 1;

  else
    {
      a = lookup_attribute ("interrupt", DECL_ATTRIBUTES (func));
      ret = a != NULL_TREE;
    }

  /* Its not safe to trust global variables until after function inlining has
     been done.  */
  if (reload_completed | reload_in_progress)
    v850_interrupt_p = ret;

  return ret;
}


static void
v850_encode_data_area (tree decl, rtx symbol)
{
  int flags;

  /* Map explicit sections into the appropriate attribute */
  if (v850_get_data_area (decl) == DATA_AREA_NORMAL)
    {
      if (DECL_SECTION_NAME (decl))
	{
	  const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
	  
	  if (streq (name, ".zdata") || streq (name, ".zbss"))
	    v850_set_data_area (decl, DATA_AREA_ZDA);

	  else if (streq (name, ".sdata") || streq (name, ".sbss"))
	    v850_set_data_area (decl, DATA_AREA_SDA);

	  else if (streq (name, ".tdata"))
	    v850_set_data_area (decl, DATA_AREA_TDA);
	}

      /* If no attribute, support -m{zda,sda,tda}=n */
      else
	{
	  int size = int_size_in_bytes (TREE_TYPE (decl));
	  if (size <= 0)
	    ;

	  else if (size <= small_memory_max [(int) SMALL_MEMORY_TDA])
	    v850_set_data_area (decl, DATA_AREA_TDA);

	  else if (size <= small_memory_max [(int) SMALL_MEMORY_SDA])
	    v850_set_data_area (decl, DATA_AREA_SDA);

	  else if (size <= small_memory_max [(int) SMALL_MEMORY_ZDA])
	    v850_set_data_area (decl, DATA_AREA_ZDA);
	}
      
      if (v850_get_data_area (decl) == DATA_AREA_NORMAL)
	return;
    }

  flags = SYMBOL_REF_FLAGS (symbol);
  switch (v850_get_data_area (decl))
    {
    case DATA_AREA_ZDA: flags |= SYMBOL_FLAG_ZDA; break;
    case DATA_AREA_TDA: flags |= SYMBOL_FLAG_TDA; break;
    case DATA_AREA_SDA: flags |= SYMBOL_FLAG_SDA; break;
    default: gcc_unreachable ();
    }
  SYMBOL_REF_FLAGS (symbol) = flags;
}

static void
v850_encode_section_info (tree decl, rtx rtl, int first)
{
  default_encode_section_info (decl, rtl, first);

  if (TREE_CODE (decl) == VAR_DECL
      && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
    v850_encode_data_area (decl, XEXP (rtl, 0));
}

/* Construct a JR instruction to a routine that will perform the equivalent of
   the RTL passed in as an argument.  This RTL is a function epilogue that
   pops registers off the stack and possibly releases some extra stack space
   as well.  The code has already verified that the RTL matches these
   requirements.  */

char *
construct_restore_jr (rtx op)
{
  int count = XVECLEN (op, 0);
  int stack_bytes;
  unsigned long int mask;
  unsigned long int first;
  unsigned long int last;
  int i;
  static char buff [100]; /* XXX */
  
  if (count <= 2)
    {
      error ("bogus JR construction: %d", count);
      return NULL;
    }

  /* Work out how many bytes to pop off the stack before retrieving
     registers.  */
  gcc_assert (GET_CODE (XVECEXP (op, 0, 1)) == SET);
  gcc_assert (GET_CODE (SET_SRC (XVECEXP (op, 0, 1))) == PLUS);
  gcc_assert (GET_CODE (XEXP (SET_SRC (XVECEXP (op, 0, 1)), 1)) == CONST_INT);
    
  stack_bytes = INTVAL (XEXP (SET_SRC (XVECEXP (op, 0, 1)), 1));

  /* Each pop will remove 4 bytes from the stack....  */
  stack_bytes -= (count - 2) * 4;

  /* Make sure that the amount we are popping either 0 or 16 bytes.  */
  if (stack_bytes != 0)
    {
      error ("bad amount of stack space removal: %d", stack_bytes);
      return NULL;
    }

  /* Now compute the bit mask of registers to push.  */
  mask = 0;
  for (i = 2; i < count; i++)
    {
      rtx vector_element = XVECEXP (op, 0, i);
      
      gcc_assert (GET_CODE (vector_element) == SET);
      gcc_assert (GET_CODE (SET_DEST (vector_element)) == REG);
      gcc_assert (register_is_ok_for_epilogue (SET_DEST (vector_element),
					       SImode));
      
      mask |= 1 << REGNO (SET_DEST (vector_element));
    }

  /* Scan for the first register to pop.  */
  for (first = 0; first < 32; first++)
    {
      if (mask & (1 << first))
	break;
    }

  gcc_assert (first < 32);

  /* Discover the last register to pop.  */
  if (mask & (1 << LINK_POINTER_REGNUM))
    {
      last = LINK_POINTER_REGNUM;
    }
  else
    {
      gcc_assert (!stack_bytes);
      gcc_assert (mask & (1 << 29));
      
      last = 29;
    }

  /* Note, it is possible to have gaps in the register mask.
     We ignore this here, and generate a JR anyway.  We will
     be popping more registers than is strictly necessary, but
     it does save code space.  */
  
  if (TARGET_LONG_CALLS)
    {
      char name[40];
      
      if (first == last)
	sprintf (name, "__return_%s", reg_names [first]);
      else
	sprintf (name, "__return_%s_%s", reg_names [first], reg_names [last]);
      
      sprintf (buff, "movhi hi(%s), r0, r6\n\tmovea lo(%s), r6, r6\n\tjmp r6",
	       name, name);
    }
  else
    {
      if (first == last)
	sprintf (buff, "jr __return_%s", reg_names [first]);
      else
	sprintf (buff, "jr __return_%s_%s", reg_names [first], reg_names [last]);
    }
  
  return buff;
}


/* Construct a JARL instruction to a routine that will perform the equivalent
   of the RTL passed as a parameter.  This RTL is a function prologue that
   saves some of the registers r20 - r31 onto the stack, and possibly acquires
   some stack space as well.  The code has already verified that the RTL
   matches these requirements.  */
char *
construct_save_jarl (rtx op)
{
  int count = XVECLEN (op, 0);
  int stack_bytes;
  unsigned long int mask;
  unsigned long int first;
  unsigned long int last;
  int i;
  static char buff [100]; /* XXX */
  
  if (count <= (TARGET_LONG_CALLS ? 3 : 2)) 
    {
      error ("bogus JARL construction: %d", count);
      return NULL;
    }

  /* Paranoia.  */
  gcc_assert (GET_CODE (XVECEXP (op, 0, 0)) == SET);
  gcc_assert (GET_CODE (SET_SRC (XVECEXP (op, 0, 0))) == PLUS);
  gcc_assert (GET_CODE (XEXP (SET_SRC (XVECEXP (op, 0, 0)), 0)) == REG);
  gcc_assert (GET_CODE (XEXP (SET_SRC (XVECEXP (op, 0, 0)), 1)) == CONST_INT);
    
  /* Work out how many bytes to push onto the stack after storing the
     registers.  */
  stack_bytes = INTVAL (XEXP (SET_SRC (XVECEXP (op, 0, 0)), 1));

  /* Each push will put 4 bytes from the stack....  */
  stack_bytes += (count - (TARGET_LONG_CALLS ? 3 : 2)) * 4;

  /* Make sure that the amount we are popping either 0 or 16 bytes.  */
  if (stack_bytes != 0)
    {
      error ("bad amount of stack space removal: %d", stack_bytes);
      return NULL;
    }

  /* Now compute the bit mask of registers to push.  */
  mask = 0;
  for (i = 1; i < count - (TARGET_LONG_CALLS ? 2 : 1); i++)
    {
      rtx vector_element = XVECEXP (op, 0, i);
      
      gcc_assert (GET_CODE (vector_element) == SET);
      gcc_assert (GET_CODE (SET_SRC (vector_element)) == REG);
      gcc_assert (register_is_ok_for_epilogue (SET_SRC (vector_element),
					       SImode));
      
      mask |= 1 << REGNO (SET_SRC (vector_element));
    }

  /* Scan for the first register to push.  */  
  for (first = 0; first < 32; first++)
    {
      if (mask & (1 << first))
	break;
    }

  gcc_assert (first < 32);

  /* Discover the last register to push.  */
  if (mask & (1 << LINK_POINTER_REGNUM))
    {
      last = LINK_POINTER_REGNUM;
    }
  else
    {
      gcc_assert (!stack_bytes);
      gcc_assert (mask & (1 << 29));
      
      last = 29;
    }

  /* Note, it is possible to have gaps in the register mask.
     We ignore this here, and generate a JARL anyway.  We will
     be pushing more registers than is strictly necessary, but
     it does save code space.  */
  
  if (TARGET_LONG_CALLS)
    {
      char name[40];
      
      if (first == last)
	sprintf (name, "__save_%s", reg_names [first]);
      else
	sprintf (name, "__save_%s_%s", reg_names [first], reg_names [last]);
      
      sprintf (buff, "movhi hi(%s), r0, r11\n\tmovea lo(%s), r11, r11\n\tjarl .+4, r10\n\tadd 4, r10\n\tjmp r11",
	       name, name);
    }
  else
    {
      if (first == last)
	sprintf (buff, "jarl __save_%s, r10", reg_names [first]);
      else
	sprintf (buff, "jarl __save_%s_%s, r10", reg_names [first],
		 reg_names [last]);
    }

  return buff;
}

/* A version of asm_output_aligned_bss() that copes with the special
   data areas of the v850.  */
void
v850_output_aligned_bss (FILE * file,
                         tree decl,
                         const char * name,
                         unsigned HOST_WIDE_INT size,
                         int align)
{
  switch (v850_get_data_area (decl))
    {
    case DATA_AREA_ZDA:
      switch_to_section (zbss_section);
      break;

    case DATA_AREA_SDA:
      switch_to_section (sbss_section);
      break;

    case DATA_AREA_TDA:
      switch_to_section (tdata_section);
      
    default:
      switch_to_section (bss_section);
      break;
    }
  
  ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
#ifdef ASM_DECLARE_OBJECT_NAME
  last_assemble_variable_decl = decl;
  ASM_DECLARE_OBJECT_NAME (file, name, decl);
#else
  /* Standard thing is just output label for the object.  */
  ASM_OUTPUT_LABEL (file, name);
#endif /* ASM_DECLARE_OBJECT_NAME */
  ASM_OUTPUT_SKIP (file, size ? size : 1);
}

/* Called via the macro ASM_OUTPUT_DECL_COMMON */
void
v850_output_common (FILE * file,
                    tree decl,
                    const char * name,
                    int size,
                    int align)
{
  if (decl == NULL_TREE)
    {
      fprintf (file, "%s", COMMON_ASM_OP);
    }
  else
    {
      switch (v850_get_data_area (decl))
	{
	case DATA_AREA_ZDA:
	  fprintf (file, "%s", ZCOMMON_ASM_OP);
	  break;

	case DATA_AREA_SDA:
	  fprintf (file, "%s", SCOMMON_ASM_OP);
	  break;

	case DATA_AREA_TDA:
	  fprintf (file, "%s", TCOMMON_ASM_OP);
	  break;
      
	default:
	  fprintf (file, "%s", COMMON_ASM_OP);
	  break;
	}
    }
  
  assemble_name (file, name);
  fprintf (file, ",%u,%u\n", size, align / BITS_PER_UNIT);
}

/* Called via the macro ASM_OUTPUT_DECL_LOCAL */
void
v850_output_local (FILE * file,
                   tree decl,
                   const char * name,
                   int size,
                   int align)
{
  fprintf (file, "%s", LOCAL_ASM_OP);
  assemble_name (file, name);
  fprintf (file, "\n");
  
  ASM_OUTPUT_ALIGNED_DECL_COMMON (file, decl, name, size, align);
}

/* Add data area to the given declaration if a ghs data area pragma is
   currently in effect (#pragma ghs startXXX/endXXX).  */
static void
v850_insert_attributes (tree decl, tree * attr_ptr ATTRIBUTE_UNUSED )
{
  if (data_area_stack
      && data_area_stack->data_area
      && current_function_decl == NULL_TREE
      && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
      && v850_get_data_area (decl) == DATA_AREA_NORMAL)
    v850_set_data_area (decl, data_area_stack->data_area);

  /* Initialize the default names of the v850 specific sections,
     if this has not been done before.  */
  
  if (GHS_default_section_names [(int) GHS_SECTION_KIND_SDATA] == NULL)
    {
      GHS_default_section_names [(int) GHS_SECTION_KIND_SDATA]
	= build_string (sizeof (".sdata")-1, ".sdata");

      GHS_default_section_names [(int) GHS_SECTION_KIND_ROSDATA]
	= build_string (sizeof (".rosdata")-1, ".rosdata");

      GHS_default_section_names [(int) GHS_SECTION_KIND_TDATA]
	= build_string (sizeof (".tdata")-1, ".tdata");
      
      GHS_default_section_names [(int) GHS_SECTION_KIND_ZDATA]
	= build_string (sizeof (".zdata")-1, ".zdata");

      GHS_default_section_names [(int) GHS_SECTION_KIND_ROZDATA]
	= build_string (sizeof (".rozdata")-1, ".rozdata");
    }
  
  if (current_function_decl == NULL_TREE
      && (TREE_CODE (decl) == VAR_DECL
	  || TREE_CODE (decl) == CONST_DECL
	  || TREE_CODE (decl) == FUNCTION_DECL)
      && (!DECL_EXTERNAL (decl) || DECL_INITIAL (decl))
      && !DECL_SECTION_NAME (decl))
    {
      enum GHS_section_kind kind = GHS_SECTION_KIND_DEFAULT;
      tree chosen_section;

      if (TREE_CODE (decl) == FUNCTION_DECL)
	kind = GHS_SECTION_KIND_TEXT;
      else
	{
	  /* First choose a section kind based on the data area of the decl.  */
	  switch (v850_get_data_area (decl))
	    {
	    default:
	      gcc_unreachable ();
	      
	    case DATA_AREA_SDA:
	      kind = ((TREE_READONLY (decl))
		      ? GHS_SECTION_KIND_ROSDATA
		      : GHS_SECTION_KIND_SDATA);
	      break;
	      
	    case DATA_AREA_TDA:
	      kind = GHS_SECTION_KIND_TDATA;
	      break;
	      
	    case DATA_AREA_ZDA:
	      kind = ((TREE_READONLY (decl))
		      ? GHS_SECTION_KIND_ROZDATA
		      : GHS_SECTION_KIND_ZDATA);
	      break;
	      
	    case DATA_AREA_NORMAL:		 /* default data area */
	      if (TREE_READONLY (decl))
		kind = GHS_SECTION_KIND_RODATA;
	      else if (DECL_INITIAL (decl))
		kind = GHS_SECTION_KIND_DATA;
	      else
		kind = GHS_SECTION_KIND_BSS;
	    }
	}

      /* Now, if the section kind has been explicitly renamed,
         then attach a section attribute.  */
      chosen_section = GHS_current_section_names [(int) kind];

      /* Otherwise, if this kind of section needs an explicit section
         attribute, then also attach one.  */
      if (chosen_section == NULL)
        chosen_section = GHS_default_section_names [(int) kind];

      if (chosen_section)
	{
	  /* Only set the section name if specified by a pragma, because
	     otherwise it will force those variables to get allocated storage
	     in this module, rather than by the linker.  */
	  DECL_SECTION_NAME (decl) = chosen_section;
	}
    }
}

/* Construct a DISPOSE instruction that is the equivalent of
   the given RTX.  We have already verified that this should
   be possible.  */

char *
construct_dispose_instruction (rtx op)
{
  int                count = XVECLEN (op, 0);
  int                stack_bytes;
  unsigned long int  mask;
  int		     i;
  static char        buff[ 100 ]; /* XXX */
  int                use_callt = 0;
  
  if (count <= 2)
    {
      error ("bogus DISPOSE construction: %d", count);
      return NULL;
    }

  /* Work out how many bytes to pop off the
     stack before retrieving registers.  */
  gcc_assert (GET_CODE (XVECEXP (op, 0, 1)) == SET);
  gcc_assert (GET_CODE (SET_SRC (XVECEXP (op, 0, 1))) == PLUS);
  gcc_assert (GET_CODE (XEXP (SET_SRC (XVECEXP (op, 0, 1)), 1)) == CONST_INT);
    
  stack_bytes = INTVAL (XEXP (SET_SRC (XVECEXP (op, 0, 1)), 1));

  /* Each pop will remove 4 bytes from the stack....  */
  stack_bytes -= (count - 2) * 4;

  /* Make sure that the amount we are popping
     will fit into the DISPOSE instruction.  */
  if (stack_bytes > 128)
    {
      error ("too much stack space to dispose of: %d", stack_bytes);
      return NULL;
    }

  /* Now compute the bit mask of registers to push.  */
  mask = 0;

  for (i = 2; i < count; i++)
    {
      rtx vector_element = XVECEXP (op, 0, i);
      
      gcc_assert (GET_CODE (vector_element) == SET);
      gcc_assert (GET_CODE (SET_DEST (vector_element)) == REG);
      gcc_assert (register_is_ok_for_epilogue (SET_DEST (vector_element),
					       SImode));

      if (REGNO (SET_DEST (vector_element)) == 2)
	use_callt = 1;
      else
        mask |= 1 << REGNO (SET_DEST (vector_element));
    }

  if (! TARGET_DISABLE_CALLT
      && (use_callt || stack_bytes == 0))
    {
      if (use_callt)
	{
	  sprintf (buff, "callt ctoff(__callt_return_r2_r%d)", (mask & (1 << 31)) ? 31 : 29);
	  return buff;
	}
      else
	{
	  for (i = 20; i < 32; i++)
	    if (mask & (1 << i))
	      break;
	  
	  if (i == 31)
	    sprintf (buff, "callt ctoff(__callt_return_r31c)");
	  else
	    sprintf (buff, "callt ctoff(__callt_return_r%d_r%s)",
		     i, (mask & (1 << 31)) ? "31c" : "29");
	}
    }
  else
    {
      static char        regs [100]; /* XXX */
      int                done_one;
      
      /* Generate the DISPOSE instruction.  Note we could just issue the
	 bit mask as a number as the assembler can cope with this, but for
	 the sake of our readers we turn it into a textual description.  */
      regs[0] = 0;
      done_one = 0;
      
      for (i = 20; i < 32; i++)
	{
	  if (mask & (1 << i))
	    {
	      int first;
	      
	      if (done_one)
		strcat (regs, ", ");
	      else
		done_one = 1;
	      
	      first = i;
	      strcat (regs, reg_names[ first ]);
	      
	      for (i++; i < 32; i++)
		if ((mask & (1 << i)) == 0)
		  break;
	      
	      if (i > first + 1)
		{
		  strcat (regs, " - ");
		  strcat (regs, reg_names[ i - 1 ] );
		}
	    }
	}
      
      sprintf (buff, "dispose %d {%s}, r31", stack_bytes / 4, regs);
    }
  
  return buff;
}

/* Construct a PREPARE instruction that is the equivalent of
   the given RTL.  We have already verified that this should
   be possible.  */

char *
construct_prepare_instruction (rtx op)
{
  int                count;
  int                stack_bytes;
  unsigned long int  mask;
  int		     i;
  static char        buff[ 100 ]; /* XXX */
  int		     use_callt = 0;
  
  if (XVECLEN (op, 0) <= 1)
    {
      error ("bogus PREPEARE construction: %d", XVECLEN (op, 0));
      return NULL;
    }

  /* Work out how many bytes to push onto
     the stack after storing the registers.  */
  gcc_assert (GET_CODE (XVECEXP (op, 0, 0)) == SET);
  gcc_assert (GET_CODE (SET_SRC (XVECEXP (op, 0, 0))) == PLUS);
  gcc_assert (GET_CODE (XEXP (SET_SRC (XVECEXP (op, 0, 0)), 1)) == CONST_INT);
    
  stack_bytes = INTVAL (XEXP (SET_SRC (XVECEXP (op, 0, 0)), 1));


  /* Make sure that the amount we are popping
     will fit into the DISPOSE instruction.  */
  if (stack_bytes < -128)
    {
      error ("too much stack space to prepare: %d", stack_bytes);
      return NULL;
    }

  /* Now compute the bit mask of registers to push.  */
  count = 0;
  mask = 0;
  for (i = 1; i < XVECLEN (op, 0); i++)
    {
      rtx vector_element = XVECEXP (op, 0, i);
      
      if (GET_CODE (vector_element) == CLOBBER)
	continue;
      
      gcc_assert (GET_CODE (vector_element) == SET);
      gcc_assert (GET_CODE (SET_SRC (vector_element)) == REG);
      gcc_assert (register_is_ok_for_epilogue (SET_SRC (vector_element),
					       SImode));

      if (REGNO (SET_SRC (vector_element)) == 2)
	use_callt = 1;
      else
	mask |= 1 << REGNO (SET_SRC (vector_element));
      count++;
    }

  stack_bytes += count * 4;

  if ((! TARGET_DISABLE_CALLT)
      && (use_callt || stack_bytes == 0))
    {
      if (use_callt)
	{
	  sprintf (buff, "callt ctoff(__callt_save_r2_r%d)", (mask & (1 << 31)) ? 31 : 29 );
	  return buff;
	}
      
      for (i = 20; i < 32; i++)
	if (mask & (1 << i))
	  break;

      if (i == 31)
	sprintf (buff, "callt ctoff(__callt_save_r31c)");
      else
	sprintf (buff, "callt ctoff(__callt_save_r%d_r%s)",
		 i, (mask & (1 << 31)) ? "31c" : "29");
    }
  else
    {
      static char        regs [100]; /* XXX */
      int                done_one;

      
      /* Generate the PREPARE instruction.  Note we could just issue the
	 bit mask as a number as the assembler can cope with this, but for
	 the sake of our readers we turn it into a textual description.  */      
      regs[0] = 0;
      done_one = 0;
      
      for (i = 20; i < 32; i++)
	{
	  if (mask & (1 << i))
	    {
	      int first;
	      
	      if (done_one)
		strcat (regs, ", ");
	      else
		done_one = 1;
	      
	      first = i;
	      strcat (regs, reg_names[ first ]);
	      
	      for (i++; i < 32; i++)
		if ((mask & (1 << i)) == 0)
		  break;
	      
	      if (i > first + 1)
		{
		  strcat (regs, " - ");
		  strcat (regs, reg_names[ i - 1 ] );
		}
	    }
	}
      	 
      sprintf (buff, "prepare {%s}, %d", regs, (- stack_bytes) / 4);
    }
  
  return buff;
}

/* Return an RTX indicating where the return address to the
   calling function can be found.  */

rtx
v850_return_addr (int count)
{
  if (count != 0)
    return const0_rtx;

  return get_hard_reg_initial_val (Pmode, LINK_POINTER_REGNUM);
}

/* Implement TARGET_ASM_INIT_SECTIONS.  */

static void
v850_asm_init_sections (void)
{
  rosdata_section
    = get_unnamed_section (0, output_section_asm_op,
			   "\t.section .rosdata,\"a\"");

  rozdata_section
    = get_unnamed_section (0, output_section_asm_op,
			   "\t.section .rozdata,\"a\"");

  tdata_section
    = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
			   "\t.section .tdata,\"aw\"");

  zdata_section
    = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
			   "\t.section .zdata,\"aw\"");

  zbss_section
    = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
			   output_section_asm_op,
			   "\t.section .zbss,\"aw\"");
}

static section *
v850_select_section (tree exp,
                     int reloc ATTRIBUTE_UNUSED,
                     unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
{
  if (TREE_CODE (exp) == VAR_DECL)
    {
      int is_const;
      if (!TREE_READONLY (exp)
	  || TREE_SIDE_EFFECTS (exp)
	  || !DECL_INITIAL (exp)
	  || (DECL_INITIAL (exp) != error_mark_node
	      && !TREE_CONSTANT (DECL_INITIAL (exp))))
        is_const = FALSE;
      else
        is_const = TRUE;

      switch (v850_get_data_area (exp))
        {
        case DATA_AREA_ZDA:
	  return is_const ? rozdata_section : zdata_section;

        case DATA_AREA_TDA:
	  return tdata_section;

        case DATA_AREA_SDA:
	  return is_const ? rosdata_section : sdata_section;

        default:
	  return is_const ? readonly_data_section : data_section;
        }
    }
  return readonly_data_section;
}

/* Worker function for TARGET_FUNCTION_VALUE_REGNO_P.  */

static bool
v850_function_value_regno_p (const unsigned int regno)
{
  return (regno == 10);
}

/* Worker function for TARGET_RETURN_IN_MEMORY.  */

static bool
v850_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED)
{
  /* Return values > 8 bytes in length in memory.  */
  return int_size_in_bytes (type) > 8 || TYPE_MODE (type) == BLKmode;
}

/* Worker function for TARGET_FUNCTION_VALUE.  */

static rtx
v850_function_value (const_tree valtype, 
                    const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
                    bool outgoing ATTRIBUTE_UNUSED)
{
  return gen_rtx_REG (TYPE_MODE (valtype), 10);
}


/* Worker function for TARGET_SETUP_INCOMING_VARARGS.  */

static void
v850_setup_incoming_varargs (cumulative_args_t ca,
			     enum machine_mode mode ATTRIBUTE_UNUSED,
			     tree type ATTRIBUTE_UNUSED,
			     int *pretend_arg_size ATTRIBUTE_UNUSED,
			     int second_time ATTRIBUTE_UNUSED)
{
  get_cumulative_args (ca)->anonymous_args = (!TARGET_GHS ? 1 : 0);
}

/* Worker function for TARGET_CAN_ELIMINATE.  */

static bool
v850_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
{
  return (to == STACK_POINTER_REGNUM ? ! frame_pointer_needed : true);
}

/* Worker function for TARGET_CONDITIONAL_REGISTER_USAGE.

   If TARGET_APP_REGS is not defined then add r2 and r5 to
   the pool of fixed registers. See PR 14505.  */

static void
v850_conditional_register_usage (void)
{
  if (TARGET_APP_REGS)
    {
     fixed_regs[2] = 0;  call_used_regs[2] = 0;
     fixed_regs[5] = 0;  call_used_regs[5] = 1;
    }
}

/* Worker function for TARGET_ASM_TRAMPOLINE_TEMPLATE.  */

static void
v850_asm_trampoline_template (FILE *f)
{
  fprintf (f, "\tjarl .+4,r12\n");
  fprintf (f, "\tld.w 12[r12],r20\n");
  fprintf (f, "\tld.w 16[r12],r12\n");
  fprintf (f, "\tjmp [r12]\n");
  fprintf (f, "\tnop\n");
  fprintf (f, "\t.long 0\n");
  fprintf (f, "\t.long 0\n");
}

/* Worker function for TARGET_TRAMPOLINE_INIT.  */

static void
v850_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value)
{
  rtx mem, fnaddr = XEXP (DECL_RTL (fndecl), 0);

  emit_block_move (m_tramp, assemble_trampoline_template (),
		   GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL);

  mem = adjust_address (m_tramp, SImode, 16);
  emit_move_insn (mem, chain_value);
  mem = adjust_address (m_tramp, SImode, 20);
  emit_move_insn (mem, fnaddr);
}

static int
v850_issue_rate (void)
{
  return (TARGET_V850E2_ALL? 2 : 1);
}

/* Implement TARGET_LEGITIMATE_CONSTANT_P.  */

static bool
v850_legitimate_constant_p (enum machine_mode mode ATTRIBUTE_UNUSED, rtx x)
{
  return (GET_CODE (x) == CONST_DOUBLE
	  || !(GET_CODE (x) == CONST
	       && GET_CODE (XEXP (x, 0)) == PLUS
	       && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF
	       && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT
	       && !CONST_OK_FOR_K (INTVAL (XEXP (XEXP (x, 0), 1)))));
}

static int
v850_memory_move_cost (enum machine_mode mode,
		       reg_class_t reg_class ATTRIBUTE_UNUSED,
		       bool in)
{
  switch (GET_MODE_SIZE (mode))
    {
    case 0:
      return in ? 24 : 8;
    case 1:
    case 2:
    case 3:
    case 4:
      return in ? 6 : 2;
    default:
      return (GET_MODE_SIZE (mode) / 2) * (in ? 3 : 1);
    }
}

/* V850 specific attributes.  */

static const struct attribute_spec v850_attribute_table[] =
{
  /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
       affects_type_identity } */
  { "interrupt_handler", 0, 0, true,  false, false,
    v850_handle_interrupt_attribute, false },
  { "interrupt",         0, 0, true,  false, false,
    v850_handle_interrupt_attribute, false },
  { "sda",               0, 0, true,  false, false,
    v850_handle_data_area_attribute, false },
  { "tda",               0, 0, true,  false, false,
    v850_handle_data_area_attribute, false },
  { "zda",               0, 0, true,  false, false,
    v850_handle_data_area_attribute, false },
  { NULL,                0, 0, false, false, false, NULL, false }
};

static enum unwind_info_type
v850_debug_unwind_info (void)
{
  return UI_NONE;
}

#undef  TARGET_DEBUG_UNWIND_INFO
#define TARGET_DEBUG_UNWIND_INFO	v850_debug_unwind_info

/* Initialize the GCC target structure.  */

#undef  TARGET_MEMORY_MOVE_COST
#define TARGET_MEMORY_MOVE_COST v850_memory_move_cost

#undef  TARGET_ASM_ALIGNED_HI_OP
#define TARGET_ASM_ALIGNED_HI_OP "\t.hword\t"

#undef  TARGET_PRINT_OPERAND
#define TARGET_PRINT_OPERAND v850_print_operand
#undef  TARGET_PRINT_OPERAND_ADDRESS
#define TARGET_PRINT_OPERAND_ADDRESS v850_print_operand_address
#undef  TARGET_PRINT_OPERAND_PUNCT_VALID_P
#define TARGET_PRINT_OPERAND_PUNCT_VALID_P v850_print_operand_punct_valid_p

#undef TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA
#define TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA v850_output_addr_const_extra

#undef  TARGET_ATTRIBUTE_TABLE
#define TARGET_ATTRIBUTE_TABLE v850_attribute_table

#undef  TARGET_INSERT_ATTRIBUTES
#define TARGET_INSERT_ATTRIBUTES v850_insert_attributes

#undef  TARGET_ASM_SELECT_SECTION
#define TARGET_ASM_SELECT_SECTION  v850_select_section

/* The assembler supports switchable .bss sections, but
   v850_select_section doesn't yet make use of them.  */
#undef  TARGET_HAVE_SWITCHABLE_BSS_SECTIONS
#define TARGET_HAVE_SWITCHABLE_BSS_SECTIONS false

#undef  TARGET_ENCODE_SECTION_INFO
#define TARGET_ENCODE_SECTION_INFO v850_encode_section_info

#undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true

#undef  TARGET_RTX_COSTS
#define TARGET_RTX_COSTS v850_rtx_costs

#undef  TARGET_ADDRESS_COST
#define TARGET_ADDRESS_COST hook_int_rtx_mode_as_bool_0

#undef  TARGET_MACHINE_DEPENDENT_REORG
#define TARGET_MACHINE_DEPENDENT_REORG v850_reorg

#undef  TARGET_SCHED_ISSUE_RATE
#define TARGET_SCHED_ISSUE_RATE v850_issue_rate

#undef  TARGET_FUNCTION_VALUE_REGNO_P
#define TARGET_FUNCTION_VALUE_REGNO_P v850_function_value_regno_p
#undef  TARGET_FUNCTION_VALUE
#define TARGET_FUNCTION_VALUE v850_function_value

#undef  TARGET_PROMOTE_PROTOTYPES
#define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true

#undef  TARGET_RETURN_IN_MEMORY
#define TARGET_RETURN_IN_MEMORY v850_return_in_memory

#undef  TARGET_PASS_BY_REFERENCE
#define TARGET_PASS_BY_REFERENCE v850_pass_by_reference

#undef  TARGET_CALLEE_COPIES
#define TARGET_CALLEE_COPIES hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true

#undef  TARGET_SETUP_INCOMING_VARARGS
#define TARGET_SETUP_INCOMING_VARARGS v850_setup_incoming_varargs

#undef  TARGET_ARG_PARTIAL_BYTES
#define TARGET_ARG_PARTIAL_BYTES v850_arg_partial_bytes

#undef  TARGET_FUNCTION_ARG
#define TARGET_FUNCTION_ARG v850_function_arg

#undef  TARGET_FUNCTION_ARG_ADVANCE
#define TARGET_FUNCTION_ARG_ADVANCE v850_function_arg_advance

#undef  TARGET_CAN_ELIMINATE
#define TARGET_CAN_ELIMINATE v850_can_eliminate

#undef  TARGET_CONDITIONAL_REGISTER_USAGE
#define TARGET_CONDITIONAL_REGISTER_USAGE v850_conditional_register_usage

#undef  TARGET_ASM_TRAMPOLINE_TEMPLATE
#define TARGET_ASM_TRAMPOLINE_TEMPLATE v850_asm_trampoline_template
#undef  TARGET_TRAMPOLINE_INIT
#define TARGET_TRAMPOLINE_INIT v850_trampoline_init

#undef  TARGET_STRICT_ARGUMENT_NAMING
#define TARGET_STRICT_ARGUMENT_NAMING v850_strict_argument_naming

#undef  TARGET_LEGITIMATE_CONSTANT_P
#define TARGET_LEGITIMATE_CONSTANT_P v850_legitimate_constant_p

struct gcc_target targetm = TARGET_INITIALIZER;

#include "gt-v850.h"