* target.h (asm_out.file_start, file_start_app_off,

[official-gcc.git] / gcc / config / h8300 / h8300.c

/* Subroutines for insn-output.c for Hitachi H8/300.
   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   2001, 2002, 2003 Free Software Foundation, Inc.
   Contributed by Steve Chamberlain (sac@cygnus.com),
   Jim Wilson (wilson@cygnus.com), and Doug Evans (dje@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 2, 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 COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "real.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 "toplev.h"
#include "c-pragma.h"
#include "tm_p.h"
#include "ggc.h"
#include "target.h"
#include "target-def.h"

/* Forward declarations.  */
static const char *byte_reg (rtx, int);
static int h8300_interrupt_function_p (tree);
static int h8300_monitor_function_p (tree);
static int h8300_os_task_function_p (tree);
static void dosize (int, unsigned int);
static int round_frame_size (int);
static unsigned int compute_saved_regs (void);
static void push (int);
static void pop (int);
static const char *cond_string (enum rtx_code);
static unsigned int h8300_asm_insn_count (const char *);
static tree h8300_handle_fndecl_attribute (tree *, tree, tree, int, bool *);
static tree h8300_handle_eightbit_data_attribute (tree *, tree, tree, int, bool *);
static tree h8300_handle_tiny_data_attribute (tree *, tree, tree, int, bool *);
#ifndef OBJECT_FORMAT_ELF
static void h8300_asm_named_section (const char *, unsigned int);
#endif
static int h8300_and_costs (rtx);
static int h8300_shift_costs (rtx);

/* CPU_TYPE, says what cpu we're compiling for.  */
int cpu_type;

/* True if a #pragma interrupt has been seen for the current function.  */
static int pragma_interrupt;

/* True if a #pragma saveall has been seen for the current function.  */
static int pragma_saveall;

static const char *const names_big[] =
{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7" };

static const char *const names_extended[] =
{ "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7" };

static const char *const names_upper_extended[] =
{ "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7" };

/* Points to one of the above.  */
/* ??? The above could be put in an array indexed by CPU_TYPE.  */
const char * const *h8_reg_names;

/* Various operations needed by the following, indexed by CPU_TYPE.  */

const char *h8_push_op, *h8_pop_op, *h8_mov_op;

/* Machine-specific symbol_ref flags.  */
#define SYMBOL_FLAG_FUNCVEC_FUNCTION    (SYMBOL_FLAG_MACH_DEP << 0)
#define SYMBOL_FLAG_EIGHTBIT_DATA       (SYMBOL_FLAG_MACH_DEP << 1)
#define SYMBOL_FLAG_TINY_DATA           (SYMBOL_FLAG_MACH_DEP << 2)
\f
/* See below where shifts are handled for explanation of this enum.  */

enum shift_alg
{
  SHIFT_INLINE,
  SHIFT_ROT_AND,
  SHIFT_SPECIAL,
  SHIFT_LOOP
};

/* Symbols of the various shifts which can be used as indices.  */

enum shift_type
{
  SHIFT_ASHIFT, SHIFT_LSHIFTRT, SHIFT_ASHIFTRT
};

/* Macros to keep the shift algorithm tables small.  */
#define INL SHIFT_INLINE
#define ROT SHIFT_ROT_AND
#define LOP SHIFT_LOOP
#define SPC SHIFT_SPECIAL

/* The shift algorithms for each machine, mode, shift type, and shift
   count are defined below.  The three tables below correspond to
   QImode, HImode, and SImode, respectively.  Each table is organized
   by, in the order of indices, machine, shift type, and shift count.  */

static enum shift_alg shift_alg_qi[3][3][8] = {
  {
    /* TARGET_H8300  */
    /* 0    1    2    3    4    5    6    7  */
    { INL, INL, INL, INL, INL, ROT, ROT, ROT }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, ROT, ROT, ROT }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, LOP, LOP, SPC }  /* SHIFT_ASHIFTRT */
  },
  {
    /* TARGET_H8300H  */
    /* 0    1    2    3    4    5    6    7  */
    { INL, INL, INL, INL, INL, ROT, ROT, ROT }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, ROT, ROT, ROT }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, LOP, LOP, SPC }  /* SHIFT_ASHIFTRT */
  },
  {
    /* TARGET_H8300S  */
    /*  0    1    2    3    4    5    6    7  */
    { INL, INL, INL, INL, INL, INL, ROT, ROT }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, INL, ROT, ROT }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, INL, INL, SPC }  /* SHIFT_ASHIFTRT */
  }
};

static enum shift_alg shift_alg_hi[3][3][16] = {
  {
    /* TARGET_H8300  */
    /*  0    1    2    3    4    5    6    7  */
    /*  8    9   10   11   12   13   14   15  */
    { INL, INL, INL, INL, INL, INL, INL, SPC,
      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, LOP, LOP, SPC,
      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, LOP, LOP, SPC,
      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFTRT */
  },
  {
    /* TARGET_H8300H  */
    /*  0    1    2    3    4    5    6    7  */
    /*  8    9   10   11   12   13   14   15  */
    { INL, INL, INL, INL, INL, INL, INL, SPC,
      SPC, SPC, SPC, SPC, SPC, ROT, ROT, ROT }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, INL, INL, SPC,
      SPC, SPC, SPC, SPC, SPC, ROT, ROT, ROT }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, INL, INL, SPC,
      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFTRT */
  },
  {
    /* TARGET_H8300S  */
    /*  0    1    2    3    4    5    6    7  */
    /*  8    9   10   11   12   13   14   15  */
    { INL, INL, INL, INL, INL, INL, INL, INL,
      SPC, SPC, SPC, SPC, SPC, ROT, ROT, ROT }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, INL, INL, INL,
      SPC, SPC, SPC, SPC, SPC, ROT, ROT, ROT }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, INL, INL, INL,
      SPC, SPC, SPC, SPC, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFTRT */
  }
};

static enum shift_alg shift_alg_si[3][3][32] = {
  {
    /* TARGET_H8300  */
    /*  0    1    2    3    4    5    6    7  */
    /*  8    9   10   11   12   13   14   15  */
    /* 16   17   18   19   20   21   22   23  */
    /* 24   25   26   27   28   29   30   31  */
    { INL, INL, INL, LOP, LOP, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, LOP, LOP, LOP, LOP,
      SPC, SPC, SPC, SPC, SPC, LOP, LOP, LOP,
      SPC, SPC, SPC, SPC, LOP, LOP, LOP, SPC }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, LOP, LOP, LOP, LOP, LOP,
      SPC, SPC, LOP, LOP, LOP, LOP, LOP, SPC,
      SPC, SPC, SPC, LOP, LOP, LOP, LOP, LOP,
      SPC, SPC, SPC, SPC, SPC, LOP, LOP, SPC }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, LOP, LOP, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, LOP, LOP, LOP, SPC,
      SPC, SPC, LOP, LOP, LOP, LOP, LOP, LOP,
      SPC, SPC, SPC, LOP, LOP, LOP, LOP, SPC }, /* SHIFT_ASHIFTRT */
  },
  {
    /* TARGET_H8300H  */
    /*  0    1    2    3    4    5    6    7  */
    /*  8    9   10   11   12   13   14   15  */
    /* 16   17   18   19   20   21   22   23  */
    /* 24   25   26   27   28   29   30   31  */
    { INL, INL, INL, INL, INL, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, LOP, LOP, LOP, SPC,
      SPC, SPC, SPC, SPC, LOP, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, LOP, LOP, LOP, SPC,
      SPC, SPC, SPC, SPC, LOP, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, SPC, SPC, SPC, SPC }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, LOP, LOP, LOP, LOP,
      SPC, SPC, SPC, SPC, LOP, LOP, LOP, LOP,
      SPC, LOP, LOP, LOP, LOP, LOP, LOP, SPC }, /* SHIFT_ASHIFTRT */
  },
  {
    /* TARGET_H8300S  */
    /*  0    1    2    3    4    5    6    7  */
    /*  8    9   10   11   12   13   14   15  */
    /* 16   17   18   19   20   21   22   23  */
    /* 24   25   26   27   28   29   30   31  */
    { INL, INL, INL, INL, INL, INL, INL, INL,
      INL, INL, INL, LOP, LOP, LOP, LOP, SPC,
      SPC, SPC, SPC, SPC, SPC, SPC, LOP, LOP,
      SPC, SPC, LOP, LOP, SPC, SPC, SPC, SPC }, /* SHIFT_ASHIFT   */
    { INL, INL, INL, INL, INL, INL, INL, INL,
      INL, INL, INL, LOP, LOP, LOP, LOP, SPC,
      SPC, SPC, SPC, SPC, SPC, SPC, LOP, LOP,
      SPC, SPC, LOP, LOP, SPC, SPC, SPC, SPC }, /* SHIFT_LSHIFTRT */
    { INL, INL, INL, INL, INL, INL, INL, INL,
      INL, INL, INL, LOP, LOP, LOP, LOP, LOP,
      SPC, SPC, SPC, SPC, SPC, SPC, LOP, LOP,
      SPC, SPC, LOP, LOP, LOP, LOP, LOP, SPC }, /* SHIFT_ASHIFTRT */
  }
};

#undef INL
#undef ROT
#undef LOP
#undef SPC

enum h8_cpu
{
  H8_300,
  H8_300H,
  H8_S
};

/* Initialize various cpu specific globals at start up.  */

void
h8300_init_once (void)
{
  static const char *const h8_push_ops[2] = { "push" , "push.l" };
  static const char *const h8_pop_ops[2]  = { "pop"  , "pop.l"  };
  static const char *const h8_mov_ops[2]  = { "mov.w", "mov.l"  };

  if (TARGET_H8300)
    {
      cpu_type = (int) CPU_H8300;
      h8_reg_names = names_big;
    }
  else
    {
      /* For this we treat the H8/300H and H8S the same.  */
      cpu_type = (int) CPU_H8300H;
      h8_reg_names = names_extended;
    }
  h8_push_op = h8_push_ops[cpu_type];
  h8_pop_op = h8_pop_ops[cpu_type];
  h8_mov_op = h8_mov_ops[cpu_type];

  if (!TARGET_H8300S && TARGET_MAC)
    {
      error ("-ms2600 is used without -ms");
      target_flags |= MASK_H8300S;
    }

  if (TARGET_H8300 && TARGET_NORMAL_MODE)
    {
      error ("-mn is used without -mh or -ms");
      target_flags ^= MASK_NORMAL_MODE;
    }

  /* Some of the shifts are optimized for speed by default.
     See http://gcc.gnu.org/ml/gcc-patches/2002-07/msg01858.html
     If optimizing for size, change shift_alg for those shift to
     SHIFT_LOOP.  */
  if (optimize_size)
    {
      /* H8/300 */
      shift_alg_hi[H8_300][SHIFT_ASHIFT][5] = SHIFT_LOOP;
      shift_alg_hi[H8_300][SHIFT_ASHIFT][6] = SHIFT_LOOP;
      shift_alg_hi[H8_300][SHIFT_ASHIFT][13] = SHIFT_LOOP;
      shift_alg_hi[H8_300][SHIFT_ASHIFT][14] = SHIFT_LOOP;

      shift_alg_hi[H8_300][SHIFT_LSHIFTRT][13] = SHIFT_LOOP;
      shift_alg_hi[H8_300][SHIFT_LSHIFTRT][14] = SHIFT_LOOP;

      shift_alg_hi[H8_300][SHIFT_ASHIFTRT][13] = SHIFT_LOOP;
      shift_alg_hi[H8_300][SHIFT_ASHIFTRT][14] = SHIFT_LOOP;

      /* H8/300H */
      shift_alg_hi[H8_300H][SHIFT_ASHIFT][5] = SHIFT_LOOP;
      shift_alg_hi[H8_300H][SHIFT_ASHIFT][6] = SHIFT_LOOP;

      shift_alg_hi[H8_300H][SHIFT_LSHIFTRT][5] = SHIFT_LOOP;
      shift_alg_hi[H8_300H][SHIFT_LSHIFTRT][6] = SHIFT_LOOP;

      shift_alg_hi[H8_300H][SHIFT_ASHIFTRT][5] = SHIFT_LOOP;
      shift_alg_hi[H8_300H][SHIFT_ASHIFTRT][6] = SHIFT_LOOP;
      shift_alg_hi[H8_300H][SHIFT_ASHIFTRT][13] = SHIFT_LOOP;
      shift_alg_hi[H8_300H][SHIFT_ASHIFTRT][14] = SHIFT_LOOP;

      /* H8S */
      shift_alg_hi[H8_S][SHIFT_ASHIFTRT][14] = SHIFT_LOOP;
    }
}

static const char *
byte_reg (rtx x, int b)
{
  static const char *const names_small[] = {
    "r0l", "r0h", "r1l", "r1h", "r2l", "r2h", "r3l", "r3h",
    "r4l", "r4h", "r5l", "r5h", "r6l", "r6h", "r7l", "r7h"
  };

  return names_small[REGNO (x) * 2 + b];
}

/* REGNO must be saved/restored across calls if this macro is true.  */

#define WORD_REG_USED(regno)                                            \
  (regno < 7                                                            \
   /* No need to save registers if this function will not return.  */   \
   && ! TREE_THIS_VOLATILE (current_function_decl)                      \
   && (pragma_saveall                                                   \
       /* Save any call saved register that was used.  */               \
       || (regs_ever_live[regno] && !call_used_regs[regno])             \
       /* Save the frame pointer if it was used.  */                    \
       || (regno == FRAME_POINTER_REGNUM && regs_ever_live[regno])      \
       /* Save any register used in an interrupt handler.  */           \
       || (h8300_current_function_interrupt_function_p ()               \
           && regs_ever_live[regno])                                    \
       /* Save call clobbered registers in non-leaf interrupt           \
          handlers.  */                                                 \
       || (h8300_current_function_interrupt_function_p ()               \
           && call_used_regs[regno]                                     \
           && !current_function_is_leaf)))

/* Output assembly language to FILE for the operation OP with operand size
   SIZE to adjust the stack pointer.  */

static void
dosize (sign, size)
     int sign;
     unsigned int size;
{
  /* H8/300 cannot add/subtract a large constant with a single
     instruction.  If a temporary register is available, load the
     constant to it and then do the addition.  */
  if (TARGET_H8300
      && size > 4
      && !h8300_current_function_interrupt_function_p ()
      && !(current_function_needs_context && sign < 0))
    {
      rtx new_sp;
      rtx r3 = gen_rtx_REG (Pmode, 3);
      emit_insn (gen_rtx_SET (Pmode, r3, GEN_INT (sign * size)));
      new_sp = gen_rtx_PLUS (Pmode, stack_pointer_rtx, r3);
      emit_insn (gen_rtx_SET (Pmode, stack_pointer_rtx, new_sp));
    }
  else
    {
      /* The stack adjustment made here is further optimized by the
         splitter.  In case of H8/300, the splitter always splits the
         addition emitted here to make the adjustment
         interrupt-safe.  */
      rtx new_sp = plus_constant (stack_pointer_rtx, sign * size);
      emit_insn (gen_rtx_SET (Pmode, stack_pointer_rtx, new_sp));
    }
}

/* Round up frame size SIZE.  */

static int
round_frame_size (int size)
{
  return ((size + STACK_BOUNDARY / BITS_PER_UNIT - 1)
          & -STACK_BOUNDARY / BITS_PER_UNIT);
}

/* Compute which registers to push/pop.
   Return a bit vector of registers.  */

static unsigned int
compute_saved_regs (void)
{
  unsigned int saved_regs = 0;
  int regno;

  /* Construct a bit vector of registers to be pushed/popped.  */
  for (regno = 0; regno <= FRAME_POINTER_REGNUM; regno++)
    {
      if (WORD_REG_USED (regno))
        saved_regs |= 1 << regno;
    }

  /* Don't push/pop the frame pointer as it is treated separately.  */
  if (frame_pointer_needed)
    saved_regs &= ~(1 << FRAME_POINTER_REGNUM);

  return saved_regs;
}

/* Emit an insn to push register RN.  */

static void
push (int rn)
{
  rtx reg = gen_rtx_REG (word_mode, rn);
  rtx x;

  if (TARGET_H8300)
    x = gen_push_h8300 (reg);
  else
    x = gen_push_h8300hs (reg);
  x = emit_insn (x);
  REG_NOTES (x) = gen_rtx_EXPR_LIST (REG_INC, stack_pointer_rtx, 0);
}

/* Emit an insn to pop register RN.  */

static void
pop (int rn)
{
  rtx reg = gen_rtx_REG (word_mode, rn);
  rtx x;

  if (TARGET_H8300)
    x = gen_pop_h8300 (reg);
  else
    x = gen_pop_h8300hs (reg);
  x = emit_insn (x);
  REG_NOTES (x) = gen_rtx_EXPR_LIST (REG_INC, stack_pointer_rtx, 0);
}

/* This is what the stack looks like after the prolog of
   a function with a frame has been set up:

   <args>
   PC
   FP                   <- fp
   <locals>
   <saved registers>    <- sp

   This is what the stack looks like after the prolog of
   a function which doesn't have a frame:

   <args>
   PC
   <locals>
   <saved registers>    <- sp
*/

/* Generate RTL code for the function prologue.  */

void
h8300_expand_prologue (void)
{
  int regno;
  int saved_regs;
  int n_regs;

  /* If the current function has the OS_Task attribute set, then
     we have a naked prologue.  */
  if (h8300_os_task_function_p (current_function_decl))
    return;

  if (h8300_monitor_function_p (current_function_decl))
    /* My understanding of monitor functions is they act just like
       interrupt functions, except the prologue must mask
       interrupts.  */
    emit_insn (gen_monitor_prologue ());

  if (frame_pointer_needed)
    {
      /* Push fp.  */
      push (FRAME_POINTER_REGNUM);
      emit_insn (gen_rtx_SET (Pmode, frame_pointer_rtx, stack_pointer_rtx));
    }

  /* Leave room for locals.  */
  dosize (-1, round_frame_size (get_frame_size ()));

  /* Push the rest of the registers in ascending order.  */
  saved_regs = compute_saved_regs ();
  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno += n_regs)
    {
      n_regs = 1;
      if (saved_regs & (1 << regno))
        {
          if (TARGET_H8300S)
            {
              /* See how many registers we can push at the same time.  */
              if ((regno == 0 || regno == 4)
                  && ((saved_regs >> regno) & 0x0f) == 0x0f)
                n_regs = 4;

              else if ((regno == 0 || regno == 4)
                       && ((saved_regs >> regno) & 0x07) == 0x07)
                n_regs = 3;

              else if ((regno == 0 || regno == 2 || regno == 4 || regno == 6)
                       && ((saved_regs >> regno) & 0x03) == 0x03)
                n_regs = 2;
            }

          switch (n_regs)
            {
            case 1:
              push (regno);
              break;
            case 2:
              emit_insn (gen_stm_h8300s_2 (gen_rtx_REG (SImode, regno),
                                           gen_rtx_REG (SImode, regno + 1)));
              break;
            case 3:
              emit_insn (gen_stm_h8300s_3 (gen_rtx_REG (SImode, regno),
                                           gen_rtx_REG (SImode, regno + 1),
                                           gen_rtx_REG (SImode, regno + 2)));
              break;
            case 4:
              emit_insn (gen_stm_h8300s_4 (gen_rtx_REG (SImode, regno),
                                           gen_rtx_REG (SImode, regno + 1),
                                           gen_rtx_REG (SImode, regno + 2),
                                           gen_rtx_REG (SImode, regno + 3)));
              break;
            default:
              abort ();
            }
        }
    }
}

int
h8300_can_use_return_insn_p (void)
{
  return (reload_completed
          && !frame_pointer_needed
          && get_frame_size () == 0
          && compute_saved_regs () == 0);
}

/* Generate RTL code for the function epilogue.  */

void
h8300_expand_epilogue (void)
{
  int regno;
  int saved_regs;
  int n_regs;

  if (h8300_os_task_function_p (current_function_decl))
    /* OS_Task epilogues are nearly naked -- they just have an
       rts instruction.  */
    return;

  /* Pop the saved registers in descending order.  */
  saved_regs = compute_saved_regs ();
  for (regno = FIRST_PSEUDO_REGISTER - 1; regno >= 0; regno -= n_regs)
    {
      n_regs = 1;
      if (saved_regs & (1 << regno))
        {
          if (TARGET_H8300S)
            {
              /* See how many registers we can pop at the same time.  */
              if ((regno == 7 || regno == 3)
                  && ((saved_regs >> (regno - 3)) & 0x0f) == 0x0f)
                n_regs = 4;

              else if ((regno == 6 || regno == 2)
                       && ((saved_regs >> (regno - 2)) & 0x07) == 0x07)
                n_regs = 3;

              else if ((regno == 7 || regno == 5 || regno == 3 || regno == 1)
                       && ((saved_regs >> (regno - 1)) & 0x03) == 0x03)
                n_regs = 2;
            }

          switch (n_regs)
            {
            case 1:
              pop (regno);
              break;
            case 2:
              emit_insn (gen_ldm_h8300s_2 (gen_rtx_REG (SImode, regno - 1),
                                           gen_rtx_REG (SImode, regno)));
              break;
            case 3:
              emit_insn (gen_ldm_h8300s_3 (gen_rtx_REG (SImode, regno - 2),
                                           gen_rtx_REG (SImode, regno - 1),
                                           gen_rtx_REG (SImode, regno)));
              break;
            case 4:
              emit_insn (gen_ldm_h8300s_4 (gen_rtx_REG (SImode, regno - 3),
                                           gen_rtx_REG (SImode, regno - 2),
                                           gen_rtx_REG (SImode, regno - 1),
                                           gen_rtx_REG (SImode, regno)));
              break;
            default:
              abort ();
            }
        }
    }

  /* Deallocate locals.  */
  dosize (1, round_frame_size (get_frame_size ()));

  /* Pop frame pointer if we had one.  */
  if (frame_pointer_needed)
    pop (FRAME_POINTER_REGNUM);
}

/* Output assembly language code for the function epilogue.  */

static void
h8300_output_function_epilogue (FILE *file ATTRIBUTE_UNUSED,
                                HOST_WIDE_INT size ATTRIBUTE_UNUSED)
{
  pragma_saveall = 0;
}

/* Return nonzero if the current function is an interrupt
   function.  */

int
h8300_current_function_interrupt_function_p (void)
{
  return (h8300_interrupt_function_p (current_function_decl)
          || h8300_monitor_function_p (current_function_decl));
}

/* Output assembly code for the start of the file.  */

static void
h8300_file_start (void)
{
  default_file_start ();

  if (TARGET_H8300H)
    fputs (TARGET_NORMAL_MODE ? "\t.h8300hn\n" : "\t.h8300h\n", asm_out_file);
  else if (TARGET_H8300S)
    fputs (TARGET_NORMAL_MODE ? "\t.h8300sn\n" : "\t.h8300s\n", asm_out_file);
}

/* Output assembly language code for the end of file.  */

static void
h8300_file_end (void)
{
  fputs ("\t.end\n", asm_out_file);
}
\f
/* Return true if OP is a valid source operand for an integer move
   instruction.  */

int
general_operand_src (rtx op, enum machine_mode mode)
{
  if (GET_MODE (op) == mode
      && GET_CODE (op) == MEM
      && GET_CODE (XEXP (op, 0)) == POST_INC)
    return 1;
  return general_operand (op, mode);
}

/* Return true if OP is a valid destination operand for an integer move
   instruction.  */

int
general_operand_dst (rtx op, enum machine_mode mode)
{
  if (GET_MODE (op) == mode
      && GET_CODE (op) == MEM
      && GET_CODE (XEXP (op, 0)) == PRE_DEC)
    return 1;
  return general_operand (op, mode);
}

/* Return true if OP is a constant that contains only one 1 in its
   binary representation.  */

int
single_one_operand (rtx operand, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  if (GET_CODE (operand) == CONST_INT)
    {
      /* We really need to do this masking because 0x80 in QImode is
         represented as -128 for example.  */
      if (exact_log2 (INTVAL (operand) & GET_MODE_MASK (mode)) >= 0)
        return 1;
    }

  return 0;
}

/* Return true if OP is a constant that contains only one 0 in its
   binary representation.  */

int
single_zero_operand (rtx operand, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  if (GET_CODE (operand) == CONST_INT)
    {
      /* We really need to do this masking because 0x80 in QImode is
         represented as -128 for example.  */
      if (exact_log2 (~INTVAL (operand) & GET_MODE_MASK (mode)) >= 0)
        return 1;
    }

  return 0;
}

/* Return true if OP is a valid call operand.  */

int
call_insn_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  if (GET_CODE (op) == MEM)
    {
      rtx inside = XEXP (op, 0);
      if (register_operand (inside, Pmode))
        return 1;
      if (CONSTANT_ADDRESS_P (inside))
        return 1;
    }
  return 0;
}

/* Return 1 if an addition/subtraction of a constant integer can be
   transformed into two consecutive adds/subs that are faster than the
   straightforward way.  Otherwise, return 0.  */

int
two_insn_adds_subs_operand (rtx op, enum machine_mode mode)
{
  if (GET_CODE (op) == CONST_INT)
    {
      HOST_WIDE_INT value = INTVAL (op);

      /* Force VALUE to be positive so that we do not have to consider
         the negative case.  */
      if (value < 0)
        value = -value;
      if (TARGET_H8300H || TARGET_H8300S)
        {
          /* A constant addition/subtraction takes 2 states in QImode,
             4 states in HImode, and 6 states in SImode.  Thus, the
             only case we can win is when SImode is used, in which
             case, two adds/subs are used, taking 4 states.  */
          if (mode == SImode
              && (value == 2 + 1
                  || value == 4 + 1
                  || value == 4 + 2
                  || value == 4 + 4))
            return 1;
        }
      else
        {
          /* We do not profit directly by splitting addition or
             subtraction of 3 and 4.  However, since these are
             implemented as a sequence of adds or subs, they do not
             clobber (cc0) unlike a sequence of add.b and add.x.  */
          if (mode == HImode
              && (value == 2 + 1
                  || value == 2 + 2))
            return 1;
        }
    }

  return 0;
}

/* Split an add of a small constant into two adds/subs insns.

   If USE_INCDEC_P is nonzero, we generate the last insn using inc/dec
   instead of adds/subs.  */

void
split_adds_subs (enum machine_mode mode, rtx *operands)
{
  HOST_WIDE_INT val = INTVAL (operands[1]);
  rtx reg = operands[0];
  HOST_WIDE_INT sign = 1;
  HOST_WIDE_INT amount;
  rtx (*gen_add) (rtx, rtx, rtx);

  /* Force VAL to be positive so that we do not have to consider the
     sign.  */
  if (val < 0)
    {
      val = -val;
      sign = -1;
    }

  switch (mode)
    {
    case HImode:
      gen_add = gen_addhi3;
      break;

    case SImode:
      gen_add = gen_addsi3;
      break;

    default:
      abort ();
    }

  /* Try different amounts in descending order.  */
  for (amount = (TARGET_H8300H || TARGET_H8300S) ? 4 : 2;
       amount > 0;
       amount /= 2)
    {
      for (; val >= amount; val -= amount)
        emit_insn (gen_add (reg, reg, GEN_INT (sign * amount)));
    }

  return;
}

/* Return true if OP is a valid call operand, and OP represents
   an operand for a small call (4 bytes instead of 6 bytes).  */

int
small_call_insn_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  if (GET_CODE (op) == MEM)
    {
      rtx inside = XEXP (op, 0);

      /* Register indirect is a small call.  */
      if (register_operand (inside, Pmode))
        return 1;

      /* A call through the function vector is a small call too.  */
      if (GET_CODE (inside) == SYMBOL_REF
          && (SYMBOL_REF_FLAGS (inside) & SYMBOL_FLAG_FUNCVEC_FUNCTION))
        return 1;
    }
  /* Otherwise it's a large call.  */
  return 0;
}

/* Return true if OP is a valid jump operand.  */

int
jump_address_operand (rtx op, enum machine_mode mode)
{
  if (GET_CODE (op) == REG)
    return mode == Pmode;

  if (GET_CODE (op) == MEM)
    {
      rtx inside = XEXP (op, 0);
      if (register_operand (inside, Pmode))
        return 1;
      if (CONSTANT_ADDRESS_P (inside))
        return 1;
    }
  return 0;
}

/* Recognize valid operands for bit-field instructions.  */

extern int rtx_equal_function_value_matters;

int
bit_operand (rtx op, enum machine_mode mode)
{
  /* We can accept any general operand, except that MEM operands must
     be limited to those that use addresses valid for the 'U' constraint.  */
  if (!general_operand (op, mode))
    return 0;

  /* Accept any mem during RTL generation.  Otherwise, the code that does
     insv and extzv will think that we can not handle memory.  However,
     to avoid reload problems, we only accept 'U' MEM operands after RTL
     generation.  This means that any named pattern which uses this predicate
     must force its operands to match 'U' before emitting RTL.  */

  if (GET_CODE (op) == REG)
    return 1;
  if (GET_CODE (op) == SUBREG)
    return 1;
  return (GET_CODE (op) == MEM
          && EXTRA_CONSTRAINT (op, 'U'));
}

int
bit_memory_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return (GET_CODE (op) == MEM
          && EXTRA_CONSTRAINT (op, 'U'));
}

/* Handle machine specific pragmas for compatibility with existing
   compilers for the H8/300.

   pragma saveall generates prologue/epilogue code which saves and
   restores all the registers on function entry.

   pragma interrupt saves and restores all registers, and exits with
   an rte instruction rather than an rts.  A pointer to a function
   with this attribute may be safely used in an interrupt vector.  */

void
h8300_pr_interrupt (struct cpp_reader *pfile ATTRIBUTE_UNUSED)
{
  pragma_interrupt = 1;
}

void
h8300_pr_saveall (struct cpp_reader *pfile ATTRIBUTE_UNUSED)
{
  pragma_saveall = 1;
}

/* If the next function argument with MODE and TYPE is to be passed in
   a register, return a reg RTX for the hard register in which to pass
   the argument.  CUM represents the state after the last argument.
   If the argument is to be pushed, NULL_RTX is returned.  */

rtx
function_arg (CUMULATIVE_ARGS *cum, enum machine_mode mode,
              tree type, int named)
{
  static const char *const hand_list[] = {
    "__main",
    "__cmpsi2",
    "__divhi3",
    "__modhi3",
    "__udivhi3",
    "__umodhi3",
    "__divsi3",
    "__modsi3",
    "__udivsi3",
    "__umodsi3",
    "__mulhi3",
    "__mulsi3",
    "__reg_memcpy",
    "__reg_memset",
    "__ucmpsi2",
    0,
  };

  rtx result = NULL_RTX;
  const char *fname;
  int regpass = 0;

  /* Never pass unnamed arguments in registers.  */
  if (!named)
    return NULL_RTX;

  /* Pass 3 regs worth of data in regs when user asked on the command line.  */
  if (TARGET_QUICKCALL)
    regpass = 3;

  /* If calling hand written assembler, use 4 regs of args.  */
  if (cum->libcall)
    {
      const char * const *p;

      fname = XSTR (cum->libcall, 0);

      /* See if this libcall is one of the hand coded ones.  */
      for (p = hand_list; *p && strcmp (*p, fname) != 0; p++)
        ;

      if (*p)
        regpass = 4;
    }

  if (regpass)
    {
      int size;

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

      if (size + cum->nbytes <= regpass * UNITS_PER_WORD
          && cum->nbytes / UNITS_PER_WORD <= 3)
        result = gen_rtx_REG (mode, cum->nbytes / UNITS_PER_WORD);
    }

  return result;
}
\f
static int
h8300_and_costs (rtx x)
{
  rtx operands[4];

  if (GET_MODE (x) == QImode)
    return 1;

  if (GET_MODE (x) != HImode
      && GET_MODE (x) != SImode)
    return 100;

  operands[0] = NULL;
  operands[1] = NULL;
  operands[2] = XEXP (x, 1);
  operands[3] = x;
  return compute_logical_op_length (GET_MODE (x), operands) / 2;
}

static int
h8300_shift_costs (rtx x)
{
  rtx operands[4];

  if (GET_MODE (x) != QImode
      && GET_MODE (x) != HImode
      && GET_MODE (x) != SImode)
    return 100;

  operands[0] = NULL;
  operands[1] = NULL;
  operands[2] = XEXP (x, 1);
  operands[3] = x;
  return compute_a_shift_length (NULL, operands) / 2;
}

static bool
h8300_rtx_costs (rtx x, int code, int outer_code, int *total)
{
  switch (code)
    {
    case CONST_INT:
      {
        HOST_WIDE_INT n = INTVAL (x);

        if (-4 <= n || n <= 4)
          {
            switch ((int) n)
              {
              case 0:
                *total = 0;
                return true;
              case 1:
              case 2:
              case -1:
              case -2:
                *total = 0 + (outer_code == SET);
                return true;
              case 4:
              case -4:
                if (TARGET_H8300H || TARGET_H8300S)
                  *total = 0 + (outer_code == SET);
                else
                  *total = 1;
                return true;
              }
          }
        *total = 1;
        return true;
      }

    case CONST:
    case LABEL_REF:
    case SYMBOL_REF:
      *total = 3;
      return true;

    case CONST_DOUBLE:
      *total = 20;
      return true;

    case AND:
      *total = COSTS_N_INSNS (h8300_and_costs (x));
      return true;

    /* We say that MOD and DIV are so expensive because otherwise we'll
       generate some really horrible code for division of a power of two.  */
    case MOD:
    case DIV:
      *total = 60;
      return true;

    case MULT:
      *total = 20;
      return true;

    case ASHIFT:
    case ASHIFTRT:
    case LSHIFTRT:
      *total = COSTS_N_INSNS (h8300_shift_costs (x));
      return true;

    case ROTATE:
    case ROTATERT:
      if (GET_MODE (x) == HImode)
        *total = 2;
      else
        *total = 8;
      return true;

    default:
      *total = 4;
      return true;
    }
}
\f
/* Documentation for the machine specific operand escapes:

   'E' like s but negative.
   'F' like t but negative.
   'G' constant just the negative
   'R' print operand as a byte:8 address if appropriate, else fall back to
       'X' handling.
   'S' print operand as a long word
   'T' print operand as a word
   'V' find the set bit, and print its number.
   'W' find the clear bit, and print its number.
   'X' print operand as a byte
   'Y' print either l or h depending on whether last 'Z' operand < 8 or >= 8.
       If this operand isn't a register, fall back to 'R' handling.
   'Z' print int & 7.
   'c' print the opcode corresponding to rtl
   'e' first word of 32 bit value - if reg, then least reg. if mem
       then least. if const then most sig word
   'f' second word of 32 bit value - if reg, then biggest reg. if mem
       then +2. if const then least sig word
   'j' print operand as condition code.
   'k' print operand as reverse condition code.
   's' print as low byte of 16 bit value
   't' print as high byte of 16 bit value
   'w' print as low byte of 32 bit value
   'x' print as 2nd byte of 32 bit value
   'y' print as 3rd byte of 32 bit value
   'z' print as msb of 32 bit value
*/

/* Return assembly language string which identifies a comparison type.  */

static const char *
cond_string (enum rtx_code code)
{
  switch (code)
    {
    case NE:
      return "ne";
    case EQ:
      return "eq";
    case GE:
      return "ge";
    case GT:
      return "gt";
    case LE:
      return "le";
    case LT:
      return "lt";
    case GEU:
      return "hs";
    case GTU:
      return "hi";
    case LEU:
      return "ls";
    case LTU:
      return "lo";
    default:
      abort ();
    }
}

/* Print operand X using operand code CODE to assembly language output file
   FILE.  */

void
print_operand (FILE *file, rtx x, int code)
{
  /* This is used for communication between codes V,W,Z and Y.  */
  static int bitint;

  switch (code)
    {
    case 'E':
      switch (GET_CODE (x))
        {
        case REG:
          fprintf (file, "%sl", names_big[REGNO (x)]);
          break;
        case CONST_INT:
          fprintf (file, "#%ld", (-INTVAL (x)) & 0xff);
          break;
        default:
          abort ();
        }
      break;
    case 'F':
      switch (GET_CODE (x))
        {
        case REG:
          fprintf (file, "%sh", names_big[REGNO (x)]);
          break;
        case CONST_INT:
          fprintf (file, "#%ld", ((-INTVAL (x)) & 0xff00) >> 8);
          break;
        default:
          abort ();
        }
      break;
    case 'G':
      if (GET_CODE (x) != CONST_INT)
        abort ();
      fprintf (file, "#%ld", 0xff & (-INTVAL (x)));
      break;
    case 'S':
      if (GET_CODE (x) == REG)
        fprintf (file, "%s", names_extended[REGNO (x)]);
      else
        goto def;
      break;
    case 'T':
      if (GET_CODE (x) == REG)
        fprintf (file, "%s", names_big[REGNO (x)]);
      else
        goto def;
      break;
    case 'V':
      bitint = exact_log2 (INTVAL (x) & 0xff);
      if (bitint == -1)
        abort ();
      fprintf (file, "#%d", bitint);
      break;
    case 'W':
      bitint = exact_log2 ((~INTVAL (x)) & 0xff);
      if (bitint == -1)
        abort ();
      fprintf (file, "#%d", bitint);
      break;
    case 'R':
    case 'X':
      if (GET_CODE (x) == REG)
        fprintf (file, "%s", byte_reg (x, 0));
      else
        goto def;
      break;
    case 'Y':
      if (bitint == -1)
        abort ();
      if (GET_CODE (x) == REG)
        fprintf (file, "%s%c", names_big[REGNO (x)], bitint > 7 ? 'h' : 'l');
      else
        print_operand (file, x, 'R');
      bitint = -1;
      break;
    case 'Z':
      bitint = INTVAL (x);
      fprintf (file, "#%d", bitint & 7);
      break;
    case 'c':
      switch (GET_CODE (x))
        {
        case IOR:
          fprintf (file, "or");
          break;
        case XOR:
          fprintf (file, "xor");
          break;
        case AND:
          fprintf (file, "and");
          break;
        default:
          break;
        }
      break;
    case 'e':
      switch (GET_CODE (x))
        {
        case REG:
          if (TARGET_H8300)
            fprintf (file, "%s", names_big[REGNO (x)]);
          else
            fprintf (file, "%s", names_upper_extended[REGNO (x)]);
          break;
        case MEM:
          print_operand (file, x, 0);
          break;
        case CONST_INT:
          fprintf (file, "#%ld", ((INTVAL (x) >> 16) & 0xffff));
          break;
        case CONST_DOUBLE:
          {
            long val;
            REAL_VALUE_TYPE rv;
            REAL_VALUE_FROM_CONST_DOUBLE (rv, x);
            REAL_VALUE_TO_TARGET_SINGLE (rv, val);
            fprintf (file, "#%ld", ((val >> 16) & 0xffff));
            break;
          }
        default:
          abort ();
          break;
        }
      break;
    case 'f':
      switch (GET_CODE (x))
        {
        case REG:
          if (TARGET_H8300)
            fprintf (file, "%s", names_big[REGNO (x) + 1]);
          else
            fprintf (file, "%s", names_big[REGNO (x)]);
          break;
        case MEM:
          x = adjust_address (x, HImode, 2);
          print_operand (file, x, 0);
          break;
        case CONST_INT:
          fprintf (file, "#%ld", INTVAL (x) & 0xffff);
          break;
        case CONST_DOUBLE:
          {
            long val;
            REAL_VALUE_TYPE rv;
            REAL_VALUE_FROM_CONST_DOUBLE (rv, x);
            REAL_VALUE_TO_TARGET_SINGLE (rv, val);
            fprintf (file, "#%ld", (val & 0xffff));
            break;
          }
        default:
          abort ();
        }
      break;
    case 'j':
      fputs (cond_string (GET_CODE (x)), file);
      break;
    case 'k':
      fputs (cond_string (reverse_condition (GET_CODE (x))), file);
      break;
    case 's':
      if (GET_CODE (x) == CONST_INT)
        fprintf (file, "#%ld", (INTVAL (x)) & 0xff);
      else
        fprintf (file, "%s", byte_reg (x, 0));
      break;
    case 't':
      if (GET_CODE (x) == CONST_INT)
        fprintf (file, "#%ld", (INTVAL (x) >> 8) & 0xff);
      else
        fprintf (file, "%s", byte_reg (x, 1));
      break;
    case 'w':
      if (GET_CODE (x) == CONST_INT)
        fprintf (file, "#%ld", INTVAL (x) & 0xff);
      else
        fprintf (file, "%s",
                 byte_reg (x, TARGET_H8300 ? 2 : 0));
      break;
    case 'x':
      if (GET_CODE (x) == CONST_INT)
        fprintf (file, "#%ld", (INTVAL (x) >> 8) & 0xff);
      else
        fprintf (file, "%s",
                 byte_reg (x, TARGET_H8300 ? 3 : 1));
      break;
    case 'y':
      if (GET_CODE (x) == CONST_INT)
        fprintf (file, "#%ld", (INTVAL (x) >> 16) & 0xff);
      else
        fprintf (file, "%s", byte_reg (x, 0));
      break;
    case 'z':
      if (GET_CODE (x) == CONST_INT)
        fprintf (file, "#%ld", (INTVAL (x) >> 24) & 0xff);
      else
        fprintf (file, "%s", byte_reg (x, 1));
      break;

    default:
    def:
      switch (GET_CODE (x))
        {
        case REG:
          switch (GET_MODE (x))
            {
            case QImode:
#if 0 /* Is it asm ("mov.b %0,r2l", ...) */
              fprintf (file, "%s", byte_reg (x, 0));
#else /* ... or is it asm ("mov.b %0l,r2l", ...) */
              fprintf (file, "%s", names_big[REGNO (x)]);
#endif
              break;
            case HImode:
              fprintf (file, "%s", names_big[REGNO (x)]);
              break;
            case SImode:
            case SFmode:
              fprintf (file, "%s", names_extended[REGNO (x)]);
              break;
            default:
              abort ();
            }
          break;

        case MEM:
          {
            rtx addr = XEXP (x, 0);

            fprintf (file, "@");
            output_address (addr);

            /* We fall back from smaller addressing to larger
               addressing in various ways depending on CODE.  */
            switch (code)
              {
              case 'R':
                /* Used for mov.b and bit operations.  */
                if (h8300_eightbit_constant_address_p (addr))
                  {
                    fprintf (file, ":8");
                    break;
                  }

                /* Fall through.  We should not get here if we are
                   processing bit operations on H8/300 or H8/300H
                   because 'U' constraint does not allow bit
                   operations on the tiny area on these machines.  */

              case 'T':
              case 'S':
                /* Used for mov.w and mov.l.  */
                if (h8300_tiny_constant_address_p (addr))
                  fprintf (file, ":16");
                break;
              default:
                break;
              }
          }
          break;

        case CONST_INT:
        case SYMBOL_REF:
        case CONST:
        case LABEL_REF:
          fprintf (file, "#");
          print_operand_address (file, x);
          break;
        case CONST_DOUBLE:
          {
            long val;
            REAL_VALUE_TYPE rv;
            REAL_VALUE_FROM_CONST_DOUBLE (rv, x);
            REAL_VALUE_TO_TARGET_SINGLE (rv, val);
            fprintf (file, "#%ld", val);
            break;
          }
        default:
          break;
        }
    }
}

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

void
print_operand_address (FILE *file, rtx addr)
{
  switch (GET_CODE (addr))
    {
    case REG:
      fprintf (file, "%s", h8_reg_names[REGNO (addr)]);
      break;

    case PRE_DEC:
      fprintf (file, "-%s", h8_reg_names[REGNO (XEXP (addr, 0))]);
      break;

    case POST_INC:
      fprintf (file, "%s+", h8_reg_names[REGNO (XEXP (addr, 0))]);
      break;

    case PLUS:
      fprintf (file, "(");
      if (GET_CODE (XEXP (addr, 0)) == REG)
        {
          /* reg,foo */
          print_operand_address (file, XEXP (addr, 1));
          fprintf (file, ",");
          print_operand_address (file, XEXP (addr, 0));
        }
      else
        {
          /* foo+k */
          print_operand_address (file, XEXP (addr, 0));
          fprintf (file, "+");
          print_operand_address (file, XEXP (addr, 1));
        }
      fprintf (file, ")");
      break;

    case CONST_INT:
      {
        /* Since the H8/300 only has 16 bit pointers, negative values are also
           those >= 32768.  This happens for example with pointer minus a
           constant.  We don't want to turn (char *p - 2) into
           (char *p + 65534) because loop unrolling can build upon this
           (IE: char *p + 131068).  */
        int n = INTVAL (addr);
        if (TARGET_H8300)
          n = (int) (short) n;
        fprintf (file, "%d", n);
        break;
      }

    default:
      output_addr_const (file, addr);
      break;
    }
}
\f
/* Output all insn addresses and their sizes into the assembly language
   output file.  This is helpful for debugging whether the length attributes
   in the md file are correct.  This is not meant to be a user selectable
   option.  */

void
final_prescan_insn (rtx insn, rtx *operand ATTRIBUTE_UNUSED,
                    int num_operands ATTRIBUTE_UNUSED)
{
  /* This holds the last insn address.  */
  static int last_insn_address = 0;

  const int uid = INSN_UID (insn);

  if (TARGET_ADDRESSES)
    {
      fprintf (asm_out_file, "; 0x%x %d\n", INSN_ADDRESSES (uid),
               INSN_ADDRESSES (uid) - last_insn_address);
      last_insn_address = INSN_ADDRESSES (uid);
    }
}

/* Prepare for an SI sized move.  */

int
do_movsi (rtx operands[])
{
  rtx src = operands[1];
  rtx dst = operands[0];
  if (!reload_in_progress && !reload_completed)
    {
      if (!register_operand (dst, GET_MODE (dst)))
        {
          rtx tmp = gen_reg_rtx (GET_MODE (dst));
          emit_move_insn (tmp, src);
          operands[1] = tmp;
        }
    }
  return 0;
}

/* Function for INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET).
   Define the offset between two registers, one to be eliminated, and
   the other its replacement, at the start of a routine.  */

int
h8300_initial_elimination_offset (int from, int to)
{
  int offset = 0;
  /* The number of bytes that the return address takes on the stack.  */
  int pc_size = POINTER_SIZE / BITS_PER_UNIT;

  if (from == ARG_POINTER_REGNUM && to == FRAME_POINTER_REGNUM)
    offset = pc_size + frame_pointer_needed * UNITS_PER_WORD;
  else if (from == RETURN_ADDRESS_POINTER_REGNUM && to == FRAME_POINTER_REGNUM)
    offset = frame_pointer_needed * UNITS_PER_WORD;
  else
    {
      int regno;

      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
        if (WORD_REG_USED (regno))
          offset += UNITS_PER_WORD;

      /* See the comments for get_frame_size.  We need to round it up to
         STACK_BOUNDARY.  */

      offset += round_frame_size (get_frame_size ());

      if (from == ARG_POINTER_REGNUM && to == STACK_POINTER_REGNUM)
        /* Skip saved PC.  */
        offset += pc_size;
    }

  return offset;
}

rtx
h8300_return_addr_rtx (int count, rtx frame)
{
  rtx ret;

  if (count == 0)
    ret = gen_rtx_MEM (Pmode,
                       gen_rtx_REG (Pmode, RETURN_ADDRESS_POINTER_REGNUM));
  else if (flag_omit_frame_pointer)
    return (rtx) 0;
  else
    ret = gen_rtx_MEM (Pmode,
                       memory_address (Pmode,
                                       plus_constant (frame, UNITS_PER_WORD)));
  set_mem_alias_set (ret, get_frame_alias_set ());
  return ret;
}

/* Update the condition code from the insn.  */

void
notice_update_cc (rtx body, rtx insn)
{
  rtx set;

  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;
      if (cc_status.value2 != 0
          && reg_overlap_mentioned_p (recog_data.operand[0], cc_status.value2))
        cc_status.value2 = 0;
      break;

    case CC_SET_ZN:
      /* Insn sets the Z,N flags of CC to recog_data.operand[0].
         The V flag is unusable.  The C flag may or may not be known but
         that's ok because alter_cond will change tests to use EQ/NE.  */
      CC_STATUS_INIT;
      cc_status.flags |= CC_OVERFLOW_UNUSABLE | CC_NO_CARRY;
      set = single_set (insn);
      cc_status.value1 = SET_SRC (set);
      if (SET_DEST (set) != cc0_rtx)
        cc_status.value2 = SET_DEST (set);
      break;

    case CC_SET_ZNV:
      /* Insn sets the Z,N,V flags of CC to recog_data.operand[0].
         The C flag may or may not be known but that's ok because
         alter_cond will change tests to use EQ/NE.  */
      CC_STATUS_INIT;
      cc_status.flags |= CC_NO_CARRY;
      set = single_set (insn);
      cc_status.value1 = SET_SRC (set);
      if (SET_DEST (set) != cc0_rtx)
        {
          /* If the destination is STRICT_LOW_PART, strip off
             STRICT_LOW_PART.  */
          if (GET_CODE (SET_DEST (set)) == STRICT_LOW_PART)
            cc_status.value2 = XEXP (SET_DEST (set), 0);
          else
            cc_status.value2 = SET_DEST (set);
        }
      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;
    }
}

/* Return nonzero if X is a stack pointer.  */

int
stack_pointer_operand (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return x == stack_pointer_rtx;
}

/* Return nonzero if X is a constant whose absolute value is greater
   than 2.  */

int
const_int_gt_2_operand (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return (GET_CODE (x) == CONST_INT
          && abs (INTVAL (x)) > 2);
}

/* Return nonzero if X is a constant whose absolute value is no
   smaller than 8.  */

int
const_int_ge_8_operand (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return (GET_CODE (x) == CONST_INT
          && abs (INTVAL (x)) >= 8);
}

/* Return nonzero if X is a constant expressible in QImode.  */

int
const_int_qi_operand (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return (GET_CODE (x) == CONST_INT
          && (INTVAL (x) & 0xff) == INTVAL (x));
}

/* Return nonzero if X is a constant expressible in HImode.  */

int
const_int_hi_operand (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return (GET_CODE (x) == CONST_INT
          && (INTVAL (x) & 0xffff) == INTVAL (x));
}

/* Return nonzero if X is a constant suitable for inc/dec.  */

int
incdec_operand (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return (GET_CODE (x) == CONST_INT
          && (CONST_OK_FOR_M (INTVAL (x))
              || CONST_OK_FOR_O (INTVAL (x))));
}

/* Return nonzero if X is either EQ or NE.  */

int
eqne_operator (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  enum rtx_code code = GET_CODE (x);

  return (code == EQ || code == NE);
}

/* Return nonzero if X is GT, LE, GTU, or LEU.  */

int
gtle_operator (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  enum rtx_code code = GET_CODE (x);

  return (code == GT || code == LE || code == GTU || code == LEU);
}

/* Return nonzero if X is either GTU or LEU.  */

int
gtuleu_operator (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  enum rtx_code code = GET_CODE (x);

  return (code == GTU || code == LEU);
}

/* Return nonzero if X is either IOR or XOR.  */

int
iorxor_operator (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  enum rtx_code code = GET_CODE (x);

  return (code == IOR || code == XOR);
}

/* Recognize valid operators for bit instructions.  */

int
bit_operator (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  enum rtx_code code = GET_CODE (x);

  return (code == XOR
          || code == AND
          || code == IOR);
}
\f
const char *
output_plussi (rtx *operands)
{
  enum machine_mode mode = GET_MODE (operands[0]);

  if (mode != SImode)
    abort ();

  if (TARGET_H8300)
    {
      if (GET_CODE (operands[2]) == REG)
        return "add.w\t%f2,%f0\n\taddx\t%y2,%y0\n\taddx\t%z2,%z0";

      if (GET_CODE (operands[2]) == CONST_INT)
        {
          HOST_WIDE_INT n = INTVAL (operands[2]);

          if ((n & 0xffffff) == 0)
            return "add\t%z2,%z0";
          if ((n & 0xffff) == 0)
            return "add\t%y2,%y0\n\taddx\t%z2,%z0";
          if ((n & 0xff) == 0)
            return "add\t%x2,%x0\n\taddx\t%y2,%y0\n\taddx\t%z2,%z0";
        }

      return "add\t%w2,%w0\n\taddx\t%x2,%x0\n\taddx\t%y2,%y0\n\taddx\t%z2,%z0";
    }
  else
    {
      if (GET_CODE (operands[2]) == REG)
        return "add.l\t%S2,%S0";

      if (GET_CODE (operands[2]) == CONST_INT)
        {
          HOST_WIDE_INT intval = INTVAL (operands[2]);

          /* See if we can finish with 2 bytes.  */

          switch ((unsigned int) intval & 0xffffffff)
            {
            case 0x00000001:
            case 0x00000002:
            case 0x00000004:
              return "adds\t%2,%S0";

            case 0xffffffff:
            case 0xfffffffe:
            case 0xfffffffc:
              return "subs\t%G2,%S0";

            case 0x00010000:
            case 0x00020000:
              operands[2] = GEN_INT (intval >> 16);
              return "inc.w\t%2,%e0";

            case 0xffff0000:
            case 0xfffe0000:
              operands[2] = GEN_INT (intval >> 16);
              return "dec.w\t%G2,%e0";
            }

          /* See if we can finish with 4 bytes.  */
          if ((intval & 0xffff) == 0)
            {
              operands[2] = GEN_INT (intval >> 16);
              return "add.w\t%2,%e0";
            }
        }

      return "add.l\t%S2,%S0";
    }
}

unsigned int
compute_plussi_length (rtx *operands)
{
  enum machine_mode mode = GET_MODE (operands[0]);

  if (mode != SImode)
    abort ();

  if (TARGET_H8300)
    {
      if (GET_CODE (operands[2]) == REG)
        return 6;

      if (GET_CODE (operands[2]) == CONST_INT)
        {
          HOST_WIDE_INT n = INTVAL (operands[2]);

          if ((n & 0xffffff) == 0)
            return 2;
          if ((n & 0xffff) == 0)
            return 4;
          if ((n & 0xff) == 0)
            return 6;
        }

      return 8;
    }
  else
    {
      if (GET_CODE (operands[2]) == REG)
        return 2;

      if (GET_CODE (operands[2]) == CONST_INT)
        {
          HOST_WIDE_INT intval = INTVAL (operands[2]);

          /* See if we can finish with 2 bytes.  */

          switch ((unsigned int) intval & 0xffffffff)
            {
            case 0x00000001:
            case 0x00000002:
            case 0x00000004:
              return 2;

            case 0xffffffff:
            case 0xfffffffe:
            case 0xfffffffc:
              return 2;

            case 0x00010000:
            case 0x00020000:
              return 2;

            case 0xffff0000:
            case 0xfffe0000:
              return 2;
            }

          /* See if we can finish with 4 bytes.  */
          if ((intval & 0xffff) == 0)
            return 4;
        }

      return 6;
    }
}

int
compute_plussi_cc (rtx *operands)
{
  enum machine_mode mode = GET_MODE (operands[0]);

  if (mode != SImode)
    abort ();

  if (TARGET_H8300)
    {
      return CC_CLOBBER;
    }
  else
    {
      if (GET_CODE (operands[2]) == REG)
        return CC_SET_ZN;

      if (GET_CODE (operands[2]) == CONST_INT)
        {
          HOST_WIDE_INT intval = INTVAL (operands[2]);

          /* See if we can finish with 2 bytes.  */

          switch ((unsigned int) intval & 0xffffffff)
            {
            case 0x00000001:
            case 0x00000002:
            case 0x00000004:
              return CC_NONE_0HIT;

            case 0xffffffff:
            case 0xfffffffe:
            case 0xfffffffc:
              return CC_NONE_0HIT;

            case 0x00010000:
            case 0x00020000:
              return CC_CLOBBER;

            case 0xffff0000:
            case 0xfffe0000:
              return CC_CLOBBER;
            }

          /* See if we can finish with 4 bytes.  */
          if ((intval & 0xffff) == 0)
            return CC_CLOBBER;
        }

      return CC_SET_ZN;
    }
}
\f
const char *
output_logical_op (enum machine_mode mode, rtx *operands)
{
  /* Figure out the logical op that we need to perform.  */
  enum rtx_code code = GET_CODE (operands[3]);
  /* Pretend that every byte is affected if both operands are registers.  */
  const unsigned HOST_WIDE_INT intval =
    (unsigned HOST_WIDE_INT) ((GET_CODE (operands[2]) == CONST_INT)
                              ? INTVAL (operands[2]) : 0x55555555);
  /* The determinant of the algorithm.  If we perform an AND, 0
     affects a bit.  Otherwise, 1 affects a bit.  */
  const unsigned HOST_WIDE_INT det = (code != AND) ? intval : ~intval;
  /* Break up DET into pieces.  */
  const unsigned HOST_WIDE_INT b0 = (det >>  0) & 0xff;
  const unsigned HOST_WIDE_INT b1 = (det >>  8) & 0xff;
  const unsigned HOST_WIDE_INT b2 = (det >> 16) & 0xff;
  const unsigned HOST_WIDE_INT b3 = (det >> 24) & 0xff;
  const unsigned HOST_WIDE_INT w0 = (det >>  0) & 0xffff;
  const unsigned HOST_WIDE_INT w1 = (det >> 16) & 0xffff;
  int lower_half_easy_p = 0;
  int upper_half_easy_p = 0;
  /* The name of an insn.  */
  const char *opname;
  char insn_buf[100];

  switch (code)
    {
    case AND:
      opname = "and";
      break;
    case IOR:
      opname = "or";
      break;
    case XOR:
      opname = "xor";
      break;
    default:
      abort ();
    }

  switch (mode)
    {
    case HImode:
      /* First, see if we can finish with one insn.  */
      if ((TARGET_H8300H || TARGET_H8300S)
          && b0 != 0
          && b1 != 0)
        {
          sprintf (insn_buf, "%s.w\t%%T2,%%T0", opname);
          output_asm_insn (insn_buf, operands);
        }
      else
        {
          /* Take care of the lower byte.  */
          if (b0 != 0)
            {
              sprintf (insn_buf, "%s\t%%s2,%%s0", opname);
              output_asm_insn (insn_buf, operands);
            }
          /* Take care of the upper byte.  */
          if (b1 != 0)
            {
              sprintf (insn_buf, "%s\t%%t2,%%t0", opname);
              output_asm_insn (insn_buf, operands);
            }
        }
      break;
    case SImode:
      if (TARGET_H8300H || TARGET_H8300S)
        {
          /* Determine if the lower half can be taken care of in no more
             than two bytes.  */
          lower_half_easy_p = (b0 == 0
                               || b1 == 0
                               || (code != IOR && w0 == 0xffff));

          /* Determine if the upper half can be taken care of in no more
             than two bytes.  */
          upper_half_easy_p = ((code != IOR && w1 == 0xffff)
                               || (code == AND && w1 == 0xff00));
        }

      /* Check if doing everything with one insn is no worse than
         using multiple insns.  */
      if ((TARGET_H8300H || TARGET_H8300S)
          && w0 != 0 && w1 != 0
          && !(lower_half_easy_p && upper_half_easy_p)
          && !(code == IOR && w1 == 0xffff
               && (w0 & 0x8000) != 0 && lower_half_easy_p))
        {
          sprintf (insn_buf, "%s.l\t%%S2,%%S0", opname);
          output_asm_insn (insn_buf, operands);
        }
      else
        {
          /* Take care of the lower and upper words individually.  For
             each word, we try different methods in the order of

             1) the special insn (in case of AND or XOR),
             2) the word-wise insn, and
             3) The byte-wise insn.  */
          if (w0 == 0xffff
              && (TARGET_H8300 ? (code == AND) : (code != IOR)))
            output_asm_insn ((code == AND)
                             ? "sub.w\t%f0,%f0" : "not.w\t%f0",
                             operands);
          else if ((TARGET_H8300H || TARGET_H8300S)
                   && (b0 != 0)
                   && (b1 != 0))
            {
              sprintf (insn_buf, "%s.w\t%%f2,%%f0", opname);
              output_asm_insn (insn_buf, operands);
            }
          else
            {
              if (b0 != 0)
                {
                  sprintf (insn_buf, "%s\t%%w2,%%w0", opname);
                  output_asm_insn (insn_buf, operands);
                }
              if (b1 != 0)
                {
                  sprintf (insn_buf, "%s\t%%x2,%%x0", opname);
                  output_asm_insn (insn_buf, operands);
                }
            }

          if ((w1 == 0xffff)
              && (TARGET_H8300 ? (code == AND) : (code != IOR)))
            output_asm_insn ((code == AND)
                             ? "sub.w\t%e0,%e0" : "not.w\t%e0",
                             operands);
          else if ((TARGET_H8300H || TARGET_H8300S)
                   && code == IOR
                   && w1 == 0xffff
                   && (w0 & 0x8000) != 0)
            {
              output_asm_insn ("exts.l\t%S0", operands);
            }
          else if ((TARGET_H8300H || TARGET_H8300S)
                   && code == AND
                   && w1 == 0xff00)
            {
              output_asm_insn ("extu.w\t%e0", operands);
            }
          else if (TARGET_H8300H || TARGET_H8300S)
            {
              if (w1 != 0)
                {
                  sprintf (insn_buf, "%s.w\t%%e2,%%e0", opname);
                  output_asm_insn (insn_buf, operands);
                }
            }
          else
            {
              if (b2 != 0)
                {
                  sprintf (insn_buf, "%s\t%%y2,%%y0", opname);
                  output_asm_insn (insn_buf, operands);
                }
              if (b3 != 0)
                {
                  sprintf (insn_buf, "%s\t%%z2,%%z0", opname);
                  output_asm_insn (insn_buf, operands);
                }
            }
        }
      break;
    default:
      abort ();
    }
  return "";
}

unsigned int
compute_logical_op_length (enum machine_mode mode, rtx *operands)
{
  /* Figure out the logical op that we need to perform.  */
  enum rtx_code code = GET_CODE (operands[3]);
  /* Pretend that every byte is affected if both operands are registers.  */
  const unsigned HOST_WIDE_INT intval =
    (unsigned HOST_WIDE_INT) ((GET_CODE (operands[2]) == CONST_INT)
                              ? INTVAL (operands[2]) : 0x55555555);
  /* The determinant of the algorithm.  If we perform an AND, 0
     affects a bit.  Otherwise, 1 affects a bit.  */
  const unsigned HOST_WIDE_INT det = (code != AND) ? intval : ~intval;
  /* Break up DET into pieces.  */
  const unsigned HOST_WIDE_INT b0 = (det >>  0) & 0xff;
  const unsigned HOST_WIDE_INT b1 = (det >>  8) & 0xff;
  const unsigned HOST_WIDE_INT b2 = (det >> 16) & 0xff;
  const unsigned HOST_WIDE_INT b3 = (det >> 24) & 0xff;
  const unsigned HOST_WIDE_INT w0 = (det >>  0) & 0xffff;
  const unsigned HOST_WIDE_INT w1 = (det >> 16) & 0xffff;
  int lower_half_easy_p = 0;
  int upper_half_easy_p = 0;
  /* Insn length.  */
  unsigned int length = 0;

  switch (mode)
    {
    case HImode:
      /* First, see if we can finish with one insn.  */
      if ((TARGET_H8300H || TARGET_H8300S)
          && b0 != 0
          && b1 != 0)
        {
          if (REG_P (operands[2]))
            length += 2;
          else
            length += 4;
        }
      else
        {
          /* Take care of the lower byte.  */
          if (b0 != 0)
            length += 2;

          /* Take care of the upper byte.  */
          if (b1 != 0)
            length += 2;
        }
      break;
    case SImode:
      if (TARGET_H8300H || TARGET_H8300S)
        {
          /* Determine if the lower half can be taken care of in no more
             than two bytes.  */
          lower_half_easy_p = (b0 == 0
                               || b1 == 0
                               || (code != IOR && w0 == 0xffff));

          /* Determine if the upper half can be taken care of in no more
             than two bytes.  */
          upper_half_easy_p = ((code != IOR && w1 == 0xffff)
                               || (code == AND && w1 == 0xff00));
        }

      /* Check if doing everything with one insn is no worse than
         using multiple insns.  */
      if ((TARGET_H8300H || TARGET_H8300S)
          && w0 != 0 && w1 != 0
          && !(lower_half_easy_p && upper_half_easy_p)
          && !(code == IOR && w1 == 0xffff
               && (w0 & 0x8000) != 0 && lower_half_easy_p))
        {
          if (REG_P (operands[2]))
            length += 4;
          else
            length += 6;
        }
      else
        {
          /* Take care of the lower and upper words individually.  For
             each word, we try different methods in the order of

             1) the special insn (in case of AND or XOR),
             2) the word-wise insn, and
             3) The byte-wise insn.  */
          if (w0 == 0xffff
              && (TARGET_H8300 ? (code == AND) : (code != IOR)))
            {
              length += 2;
            }
          else if ((TARGET_H8300H || TARGET_H8300S)
                   && (b0 != 0)
                   && (b1 != 0))
            {
              length += 4;
            }
          else
            {
              if (b0 != 0)
                length += 2;

              if (b1 != 0)
                length += 2;
            }

          if (w1 == 0xffff
              && (TARGET_H8300 ? (code == AND) : (code != IOR)))
            {
              length += 2;
            }
          else if ((TARGET_H8300H || TARGET_H8300S)
                   && code == IOR
                   && w1 == 0xffff
                   && (w0 & 0x8000) != 0)
            {
              length += 2;
            }
          else if ((TARGET_H8300H || TARGET_H8300S)
                   && code == AND
                   && w1 == 0xff00)
            {
              length += 2;
            }
          else if (TARGET_H8300H || TARGET_H8300S)
            {
              if (w1 != 0)
                length += 4;
            }
          else
            {
              if (b2 != 0)
                length += 2;

              if (b3 != 0)
                length += 2;
            }
        }
      break;
    default:
      abort ();
    }
  return length;
}

int
compute_logical_op_cc (enum machine_mode mode, rtx *operands)
{
  /* Figure out the logical op that we need to perform.  */
  enum rtx_code code = GET_CODE (operands[3]);
  /* Pretend that every byte is affected if both operands are registers.  */
  const unsigned HOST_WIDE_INT intval =
    (unsigned HOST_WIDE_INT) ((GET_CODE (operands[2]) == CONST_INT)
                              ? INTVAL (operands[2]) : 0x55555555);
  /* The determinant of the algorithm.  If we perform an AND, 0
     affects a bit.  Otherwise, 1 affects a bit.  */
  const unsigned HOST_WIDE_INT det = (code != AND) ? intval : ~intval;
  /* Break up DET into pieces.  */
  const unsigned HOST_WIDE_INT b0 = (det >>  0) & 0xff;
  const unsigned HOST_WIDE_INT b1 = (det >>  8) & 0xff;
  const unsigned HOST_WIDE_INT w0 = (det >>  0) & 0xffff;
  const unsigned HOST_WIDE_INT w1 = (det >> 16) & 0xffff;
  int lower_half_easy_p = 0;
  int upper_half_easy_p = 0;
  /* Condition code.  */
  enum attr_cc cc = CC_CLOBBER;

  switch (mode)
    {
    case HImode:
      /* First, see if we can finish with one insn.  */
      if ((TARGET_H8300H || TARGET_H8300S)
          && b0 != 0
          && b1 != 0)
        {
          cc = CC_SET_ZNV;
        }
      break;
    case SImode:
      if (TARGET_H8300H || TARGET_H8300S)
        {
          /* Determine if the lower half can be taken care of in no more
             than two bytes.  */
          lower_half_easy_p = (b0 == 0
                               || b1 == 0
                               || (code != IOR && w0 == 0xffff));

          /* Determine if the upper half can be taken care of in no more
             than two bytes.  */
          upper_half_easy_p = ((code != IOR && w1 == 0xffff)
                               || (code == AND && w1 == 0xff00));
        }

      /* Check if doing everything with one insn is no worse than
         using multiple insns.  */
      if ((TARGET_H8300H || TARGET_H8300S)
          && w0 != 0 && w1 != 0
          && !(lower_half_easy_p && upper_half_easy_p)
          && !(code == IOR && w1 == 0xffff
               && (w0 & 0x8000) != 0 && lower_half_easy_p))
        {
          cc = CC_SET_ZNV;
        }
      else
        {
          if ((TARGET_H8300H || TARGET_H8300S)
              && code == IOR
              && w1 == 0xffff
              && (w0 & 0x8000) != 0)
            {
              cc = CC_SET_ZNV;
            }
        }
      break;
    default:
      abort ();
    }
  return cc;
}
\f
/* Shifts.

   We devote a fair bit of code to getting efficient shifts since we
   can only shift one bit at a time on the H8/300 and H8/300H and only
   one or two bits at a time on the H8S.

   All shift code falls into one of the following ways of
   implementation:

   o SHIFT_INLINE: Emit straight line code for the shift; this is used
     when a straight line shift is about the same size or smaller than
     a loop.

   o SHIFT_ROT_AND: Rotate the value the opposite direction, then mask
     off the bits we don't need.  This is used when only a few of the
     bits in the original value will survive in the shifted value.

   o SHIFT_SPECIAL: Often it's possible to move a byte or a word to
     simulate a shift by 8, 16, or 24 bits.  Once moved, a few inline
     shifts can be added if the shift count is slightly more than 8 or
     16.  This case also includes other oddballs that are not worth
     explaining here.

   o SHIFT_LOOP: Emit a loop using one (or two on H8S) bit shifts.

   For each shift count, we try to use code that has no trade-off
   between code size and speed whenever possible.

   If the trade-off is unavoidable, we try to be reasonable.
   Specifically, the fastest version is one instruction longer than
   the shortest version, we take the fastest version.  We also provide
   the use a way to switch back to the shortest version with -Os.

   For the details of the shift algorithms for various shift counts,
   refer to shift_alg_[qhs]i.  */

int
nshift_operator (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED)
{
  switch (GET_CODE (x))
    {
    case ASHIFTRT:
    case LSHIFTRT:
    case ASHIFT:
      return 1;

    default:
      return 0;
    }
}

/* Emit code to do shifts.  */

void
expand_a_shift (enum machine_mode mode, int code, rtx operands[])
{
  emit_move_insn (operands[0], operands[1]);

  /* Need a loop to get all the bits we want  - we generate the
     code at emit time, but need to allocate a scratch reg now.  */

  emit_insn (gen_rtx_PARALLEL
             (VOIDmode,
              gen_rtvec (2,
                         gen_rtx_SET (VOIDmode, operands[0],
                                      gen_rtx (code, mode, operands[0],
                                               operands[2])),
                         gen_rtx_CLOBBER (VOIDmode,
                                          gen_rtx_SCRATCH (QImode)))));
}

/* Symbols of the various modes which can be used as indices.  */

enum shift_mode
{
  QIshift, HIshift, SIshift
};

/* For single bit shift insns, record assembler and what bits of the
   condition code are valid afterwards (represented as various CC_FOO
   bits, 0 means CC isn't left in a usable state).  */

struct shift_insn
{
  const char *const assembler;
  const int cc_valid;
};

/* Assembler instruction shift table.

   These tables are used to look up the basic shifts.
   They are indexed by cpu, shift_type, and mode.  */

static const struct shift_insn shift_one[2][3][3] =
{
/* H8/300 */
  {
/* SHIFT_ASHIFT */
    {
      { "shll\t%X0", CC_SET_ZNV },
      { "add.w\t%T0,%T0", CC_SET_ZN },
      { "add.w\t%f0,%f0\n\taddx\t%y0,%y0\n\taddx\t%z0,%z0", CC_CLOBBER }
    },
/* SHIFT_LSHIFTRT */
    {
      { "shlr\t%X0", CC_SET_ZNV },
      { "shlr\t%t0\n\trotxr\t%s0", CC_CLOBBER },
      { "shlr\t%z0\n\trotxr\t%y0\n\trotxr\t%x0\n\trotxr\t%w0", CC_CLOBBER }
    },
/* SHIFT_ASHIFTRT */
    {
      { "shar\t%X0", CC_SET_ZNV },
      { "shar\t%t0\n\trotxr\t%s0", CC_CLOBBER },
      { "shar\t%z0\n\trotxr\t%y0\n\trotxr\t%x0\n\trotxr\t%w0", CC_CLOBBER }
    }
  },
/* H8/300H */
  {
/* SHIFT_ASHIFT */
    {
      { "shll.b\t%X0", CC_SET_ZNV },
      { "shll.w\t%T0", CC_SET_ZNV },
      { "shll.l\t%S0", CC_SET_ZNV }
    },
/* SHIFT_LSHIFTRT */
    {
      { "shlr.b\t%X0", CC_SET_ZNV },
      { "shlr.w\t%T0", CC_SET_ZNV },
      { "shlr.l\t%S0", CC_SET_ZNV }
    },
/* SHIFT_ASHIFTRT */
    {
      { "shar.b\t%X0", CC_SET_ZNV },
      { "shar.w\t%T0", CC_SET_ZNV },
      { "shar.l\t%S0", CC_SET_ZNV }
    }
  }
};

static const struct shift_insn shift_two[3][3] =
{
/* SHIFT_ASHIFT */
    {
      { "shll.b\t#2,%X0", CC_SET_ZNV },
      { "shll.w\t#2,%T0", CC_SET_ZNV },
      { "shll.l\t#2,%S0", CC_SET_ZNV }
    },
/* SHIFT_LSHIFTRT */
    {
      { "shlr.b\t#2,%X0", CC_SET_ZNV },
      { "shlr.w\t#2,%T0", CC_SET_ZNV },
      { "shlr.l\t#2,%S0", CC_SET_ZNV }
    },
/* SHIFT_ASHIFTRT */
    {
      { "shar.b\t#2,%X0", CC_SET_ZNV },
      { "shar.w\t#2,%T0", CC_SET_ZNV },
      { "shar.l\t#2,%S0", CC_SET_ZNV }
    }
};

/* Rotates are organized by which shift they'll be used in implementing.
   There's no need to record whether the cc is valid afterwards because
   it is the AND insn that will decide this.  */

static const char *const rotate_one[2][3][3] =
{
/* H8/300 */
  {
/* SHIFT_ASHIFT */
    {
      "rotr\t%X0",
      "shlr\t%t0\n\trotxr\t%s0\n\tbst\t#7,%t0",
      0
    },
/* SHIFT_LSHIFTRT */
    {
      "rotl\t%X0",
      "shll\t%s0\n\trotxl\t%t0\n\tbst\t#0,%s0",
      0
    },
/* SHIFT_ASHIFTRT */
    {
      "rotl\t%X0",
      "shll\t%s0\n\trotxl\t%t0\n\tbst\t#0,%s0",
      0
    }
  },
/* H8/300H */
  {
/* SHIFT_ASHIFT */
    {
      "rotr.b\t%X0",
      "rotr.w\t%T0",
      "rotr.l\t%S0"
    },
/* SHIFT_LSHIFTRT */
    {
      "rotl.b\t%X0",
      "rotl.w\t%T0",
      "rotl.l\t%S0"
    },
/* SHIFT_ASHIFTRT */
    {
      "rotl.b\t%X0",
      "rotl.w\t%T0",
      "rotl.l\t%S0"
    }
  }
};

static const char *const rotate_two[3][3] =
{
/* SHIFT_ASHIFT */
    {
      "rotr.b\t#2,%X0",
      "rotr.w\t#2,%T0",
      "rotr.l\t#2,%S0"
    },
/* SHIFT_LSHIFTRT */
    {
      "rotl.b\t#2,%X0",
      "rotl.w\t#2,%T0",
      "rotl.l\t#2,%S0"
    },
/* SHIFT_ASHIFTRT */
    {
      "rotl.b\t#2,%X0",
      "rotl.w\t#2,%T0",
      "rotl.l\t#2,%S0"
    }
};

struct shift_info {
  /* Shift algorithm.  */
  enum shift_alg alg;

  /* The number of bits to be shifted by shift1 and shift2.  Valid
     when ALG is SHIFT_SPECIAL.  */
  unsigned int remainder;

  /* Special insn for a shift.  Valid when ALG is SHIFT_SPECIAL.  */
  const char *special;

  /* Insn for a one-bit shift.  Valid when ALG is either SHIFT_INLINE
     or SHIFT_SPECIAL, and REMAINDER is nonzero.  */
  const char *shift1;

  /* Insn for a two-bit shift.  Valid when ALG is either SHIFT_INLINE
     or SHIFT_SPECIAL, and REMAINDER is nonzero.  */
  const char *shift2;

  /* CC status for SHIFT_INLINE.  */
  int cc_inline;

  /* CC status  for SHIFT_SPECIAL.  */
  int cc_special;
};

static void get_shift_alg (enum shift_type,
                           enum shift_mode, unsigned int,
                           struct shift_info *);

/* Given SHIFT_TYPE, SHIFT_MODE, and shift count COUNT, determine the
   best algorithm for doing the shift.  The assembler code is stored
   in the pointers in INFO.  We achieve the maximum efficiency in most
   cases when !TARGET_H8300.  In case of TARGET_H8300, shifts in
   SImode in particular have a lot of room to optimize.

   We first determine the strategy of the shift algorithm by a table
   lookup.  If that tells us to use a hand crafted assembly code, we
   go into the big switch statement to find what that is.  Otherwise,
   we resort to a generic way, such as inlining.  In either case, the
   result is returned through INFO.  */

static void
get_shift_alg (enum shift_type shift_type, enum shift_mode shift_mode,
               unsigned int count, struct shift_info *info)
{
  enum h8_cpu cpu;

  /* Find the target CPU.  */
  if (TARGET_H8300)
    cpu = H8_300;
  else if (TARGET_H8300H)
    cpu = H8_300H;
  else
    cpu = H8_S;

  /* Find the shift algorithm.  */
  info->alg = SHIFT_LOOP;
  switch (shift_mode)
    {
    case QIshift:
      if (count < GET_MODE_BITSIZE (QImode))
        info->alg = shift_alg_qi[cpu][shift_type][count];
      break;

    case HIshift:
      if (count < GET_MODE_BITSIZE (HImode))
        info->alg = shift_alg_hi[cpu][shift_type][count];
      break;

    case SIshift:
      if (count < GET_MODE_BITSIZE (SImode))
        info->alg = shift_alg_si[cpu][shift_type][count];
      break;

    default:
      abort ();
    }

  /* Fill in INFO.  Return unless we have SHIFT_SPECIAL.  */
  switch (info->alg)
    {
    case SHIFT_INLINE:
      info->remainder = count;
      /* Fall through.  */

    case SHIFT_LOOP:
      /* It is up to the caller to know that looping clobbers cc.  */
      info->shift1 = shift_one[cpu_type][shift_type][shift_mode].assembler;
      info->shift2 = shift_two[shift_type][shift_mode].assembler;
      info->cc_inline = shift_one[cpu_type][shift_type][shift_mode].cc_valid;
      goto end;

    case SHIFT_ROT_AND:
      info->shift1 = rotate_one[cpu_type][shift_type][shift_mode];
      info->shift2 = rotate_two[shift_type][shift_mode];
      info->cc_inline = CC_CLOBBER;
      goto end;

    case SHIFT_SPECIAL:
      /* REMAINDER is 0 for most cases, so initialize it to 0.  */
      info->remainder = 0;
      info->shift1 = shift_one[cpu_type][shift_type][shift_mode].assembler;
      info->shift2 = shift_two[shift_type][shift_mode].assembler;
      info->cc_inline = shift_one[cpu_type][shift_type][shift_mode].cc_valid;
      info->cc_special = CC_CLOBBER;
      break;
    }

  /* Here we only deal with SHIFT_SPECIAL.  */
  switch (shift_mode)
    {
    case QIshift:
      /* For ASHIFTRT by 7 bits, the sign bit is simply replicated
         through the entire value.  */
      if (shift_type == SHIFT_ASHIFTRT && count == 7)
        {
          info->special = "shll\t%X0\n\tsubx\t%X0,%X0";
          goto end;
        }
      abort ();

    case HIshift:
      if (count == 7)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              if (TARGET_H8300)
                info->special = "shar.b\t%t0\n\tmov.b\t%s0,%t0\n\trotxr.b\t%t0\n\trotr.b\t%s0\n\tand.b\t#0x80,%s0";
              else
                info->special = "shar.b\t%t0\n\tmov.b\t%s0,%t0\n\trotxr.w\t%T0\n\tand.b\t#0x80,%s0";
              goto end;
            case SHIFT_LSHIFTRT:
              if (TARGET_H8300)
                info->special = "shal.b\t%s0\n\tmov.b\t%t0,%s0\n\trotxl.b\t%s0\n\trotl.b\t%t0\n\tand.b\t#0x01,%t0";
              else
                info->special = "shal.b\t%s0\n\tmov.b\t%t0,%s0\n\trotxl.w\t%T0\n\tand.b\t#0x01,%t0";
              goto end;
            case SHIFT_ASHIFTRT:
              info->special = "shal.b\t%s0\n\tmov.b\t%t0,%s0\n\trotxl.b\t%s0\n\tsubx\t%t0,%t0";
              goto end;
            }
        }
      else if ((8 <= count && count <= 13)
               || (TARGET_H8300S && count == 14))
        {
          info->remainder = count - 8;

          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "mov.b\t%s0,%t0\n\tsub.b\t%s0,%s0";
              goto end;
            case SHIFT_LSHIFTRT:
              if (TARGET_H8300)
                {
                  info->special = "mov.b\t%t0,%s0\n\tsub.b\t%t0,%t0";
                  info->shift1  = "shlr.b\t%s0";
                  info->cc_inline = CC_SET_ZNV;
                }
              else
                {
                  info->special = "mov.b\t%t0,%s0\n\textu.w\t%T0";
                  info->cc_special = CC_SET_ZNV;
                }
              goto end;
            case SHIFT_ASHIFTRT:
              if (TARGET_H8300)
                {
                  info->special = "mov.b\t%t0,%s0\n\tbld\t#7,%s0\n\tsubx\t%t0,%t0";
                  info->shift1  = "shar.b\t%s0";
                }
              else
                {
                  info->special = "mov.b\t%t0,%s0\n\texts.w\t%T0";
                  info->cc_special = CC_SET_ZNV;
                }
              goto end;
            }
        }
      else if (count == 14)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              if (TARGET_H8300)
                info->special = "mov.b\t%s0,%t0\n\trotr.b\t%t0\n\trotr.b\t%t0\n\tand.b\t#0xC0,%t0\n\tsub.b\t%s0,%s0";
              goto end;
            case SHIFT_LSHIFTRT:
              if (TARGET_H8300)
                info->special = "mov.b\t%t0,%s0\n\trotl.b\t%s0\n\trotl.b\t%s0\n\tand.b\t#3,%s0\n\tsub.b\t%t0,%t0";
              goto end;
            case SHIFT_ASHIFTRT:
              if (TARGET_H8300)
                info->special = "mov.b\t%t0,%s0\n\tshll.b\t%s0\n\tsubx.b\t%t0,%t0\n\tshll.b\t%s0\n\tmov.b\t%t0,%s0\n\tbst.b\t#0,%s0";
              else if (TARGET_H8300H)
                {
                  info->special = "shll.b\t%t0\n\tsubx.b\t%s0,%s0\n\tshll.b\t%t0\n\trotxl.b\t%s0\n\texts.w\t%T0";
                  info->cc_special = CC_SET_ZNV;
                }
              else /* TARGET_H8300S */
                abort ();
              goto end;
            }
        }
      else if (count == 15)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "bld\t#0,%s0\n\txor\t%s0,%s0\n\txor\t%t0,%t0\n\tbst\t#7,%t0";
              goto end;
            case SHIFT_LSHIFTRT:
              info->special = "bld\t#7,%t0\n\txor\t%s0,%s0\n\txor\t%t0,%t0\n\tbst\t#0,%s0";
              goto end;
            case SHIFT_ASHIFTRT:
              info->special = "shll\t%t0\n\tsubx\t%t0,%t0\n\tmov.b\t%t0,%s0";
              goto end;
            }
        }
      abort ();

    case SIshift:
      if (TARGET_H8300 && 8 <= count && count <= 9)
        {
          info->remainder = count - 8;

          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "mov.b\t%y0,%z0\n\tmov.b\t%x0,%y0\n\tmov.b\t%w0,%x0\n\tsub.b\t%w0,%w0";
              goto end;
            case SHIFT_LSHIFTRT:
              info->special = "mov.b\t%x0,%w0\n\tmov.b\t%y0,%x0\n\tmov.b\t%z0,%y0\n\tsub.b\t%z0,%z0";
              info->shift1  = "shlr\t%y0\n\trotxr\t%x0\n\trotxr\t%w0";
              goto end;
            case SHIFT_ASHIFTRT:
              info->special = "mov.b\t%x0,%w0\n\tmov.b\t%y0,%x0\n\tmov.b\t%z0,%y0\n\tshll\t%z0\n\tsubx\t%z0,%z0";
              goto end;
            }
        }
      else if (count == 8 && !TARGET_H8300)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "mov.w\t%e0,%f4\n\tmov.b\t%s4,%t4\n\tmov.b\t%t0,%s4\n\tmov.b\t%s0,%t0\n\tsub.b\t%s0,%s0\n\tmov.w\t%f4,%e0";
              goto end;
            case SHIFT_LSHIFTRT:
              info->special = "mov.w\t%e0,%f4\n\tmov.b\t%t0,%s0\n\tmov.b\t%s4,%t0\n\tmov.b\t%t4,%s4\n\textu.w\t%f4\n\tmov.w\t%f4,%e0";
              goto end;
            case SHIFT_ASHIFTRT:
              info->special = "mov.w\t%e0,%f4\n\tmov.b\t%t0,%s0\n\tmov.b\t%s4,%t0\n\tmov.b\t%t4,%s4\n\texts.w\t%f4\n\tmov.w\t%f4,%e0";
              goto end;
            }
        }
      else if (count == 15 && TARGET_H8300)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              abort ();
            case SHIFT_LSHIFTRT:
              info->special = "bld\t#7,%z0\n\tmov.w\t%e0,%f0\n\txor\t%y0,%y0\n\txor\t%z0,%z0\n\trotxl\t%w0\n\trotxl\t%x0\n\trotxl\t%y0";
              goto end;
            case SHIFT_ASHIFTRT:
              info->special = "bld\t#7,%z0\n\tmov.w\t%e0,%f0\n\trotxl\t%w0\n\trotxl\t%x0\n\tsubx\t%y0,%y0\n\tsubx\t%z0,%z0";
              goto end;
            }
        }
      else if (count == 15 && !TARGET_H8300)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "shlr.w\t%e0\n\tmov.w\t%f0,%e0\n\txor.w\t%f0,%f0\n\trotxr.l\t%S0";
              info->cc_special = CC_SET_ZNV;
              goto end;
            case SHIFT_LSHIFTRT:
              info->special = "shll.w\t%f0\n\tmov.w\t%e0,%f0\n\txor.w\t%e0,%e0\n\trotxl.l\t%S0";
              info->cc_special = CC_SET_ZNV;
              goto end;
            case SHIFT_ASHIFTRT:
              abort ();
            }
        }
      else if ((TARGET_H8300 && 16 <= count && count <= 20)
               || (TARGET_H8300H && 16 <= count && count <= 19)
               || (TARGET_H8300S && 16 <= count && count <= 21))
        {
          info->remainder = count - 16;

          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "mov.w\t%f0,%e0\n\tsub.w\t%f0,%f0";
              if (TARGET_H8300)
                info->shift1 = "add.w\t%e0,%e0";
              goto end;
            case SHIFT_LSHIFTRT:
              if (TARGET_H8300)
                {
                  info->special = "mov.w\t%e0,%f0\n\tsub.w\t%e0,%e0";
                  info->shift1  = "shlr\t%x0\n\trotxr\t%w0";
                }
              else
                {
                  info->special = "mov.w\t%e0,%f0\n\textu.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                }
              goto end;
            case SHIFT_ASHIFTRT:
              if (TARGET_H8300)
                {
                  info->special = "mov.w\t%e0,%f0\n\tshll\t%z0\n\tsubx\t%z0,%z0\n\tmov.b\t%z0,%y0";
                  info->shift1  = "shar\t%x0\n\trotxr\t%w0";
                }
              else
                {
                  info->special = "mov.w\t%e0,%f0\n\texts.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                }
              goto end;
            }
        }
      else if (TARGET_H8300 && 24 <= count && count <= 28)
        {
          info->remainder = count - 24;

          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "mov.b\t%w0,%z0\n\tsub.b\t%y0,%y0\n\tsub.w\t%f0,%f0";
              info->shift1  = "shll.b\t%z0";
              info->cc_inline = CC_SET_ZNV;
              goto end;
            case SHIFT_LSHIFTRT:
              info->special = "mov.b\t%z0,%w0\n\tsub.b\t%x0,%x0\n\tsub.w\t%e0,%e0";
              info->shift1  = "shlr.b\t%w0";
              info->cc_inline = CC_SET_ZNV;
              goto end;
            case SHIFT_ASHIFTRT:
              info->special = "mov.b\t%z0,%w0\n\tbld\t#7,%w0\n\tsubx\t%x0,%x0\n\tsubx\t%x0,%x0\n\tsubx\t%x0,%x0";
              info->shift1  = "shar.b\t%w0";
              info->cc_inline = CC_SET_ZNV;
              goto end;
            }
        }
      else if ((TARGET_H8300H && count == 24)
               || (TARGET_H8300S && 24 <= count && count <= 25))
        {
          info->remainder = count - 24;

          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              info->special = "mov.b\t%s0,%t0\n\tsub.b\t%s0,%s0\n\tmov.w\t%f0,%e0\n\tsub.w\t%f0,%f0";
              goto end;
            case SHIFT_LSHIFTRT:
              info->special = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\textu.w\t%f0\n\textu.l\t%S0";
              info->cc_special = CC_SET_ZNV;
              goto end;
            case SHIFT_ASHIFTRT:
              info->special = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\texts.w\t%f0\n\texts.l\t%S0";
              info->cc_special = CC_SET_ZNV;
              goto end;
            }
        }
      else if (!TARGET_H8300 && count == 28)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              if (TARGET_H8300H)
                info->special = "sub.w\t%e0,%e0\n\trotr.l\t%S0\n\trotr.l\t%S0\n\trotr.l\t%S0\n\trotr.l\t%S0\n\tsub.w\t%f0,%f0";
              else
                info->special = "sub.w\t%e0,%e0\n\trotr.l\t#2,%S0\n\trotr.l\t#2,%S0\n\tsub.w\t%f0,%f0";
              goto end;
            case SHIFT_LSHIFTRT:
              if (TARGET_H8300H)
                {
                  info->special = "sub.w\t%f0,%f0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\textu.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                }
              else
                info->special = "sub.w\t%f0,%f0\n\trotl.l\t#2,%S0\n\trotl.l\t#2,%S0\n\textu.l\t%S0";
              goto end;
            case SHIFT_ASHIFTRT:
              abort ();
            }
        }
      else if (!TARGET_H8300 && count == 29)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              if (TARGET_H8300H)
                info->special = "sub.w\t%e0,%e0\n\trotr.l\t%S0\n\trotr.l\t%S0\n\trotr.l\t%S0\n\tsub.w\t%f0,%f0";
              else
                info->special = "sub.w\t%e0,%e0\n\trotr.l\t#2,%S0\n\trotr.l\t%S0\n\tsub.w\t%f0,%f0";
              goto end;
            case SHIFT_LSHIFTRT:
              if (TARGET_H8300H)
                {
                  info->special = "sub.w\t%f0,%f0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\textu.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                }
              else
                {
                  info->special = "sub.w\t%f0,%f0\n\trotl.l\t#2,%S0\n\trotl.l\t%S0\n\textu.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                }
              goto end;
            case SHIFT_ASHIFTRT:
              abort ();
            }
        }
      else if (!TARGET_H8300 && count == 30)
        {
          switch (shift_type)
            {
            case SHIFT_ASHIFT:
              if (TARGET_H8300H)
                info->special = "sub.w\t%e0,%e0\n\trotr.l\t%S0\n\trotr.l\t%S0\n\tsub.w\t%f0,%f0";
              else
                info->special = "sub.w\t%e0,%e0\n\trotr.l\t#2,%S0\n\tsub.w\t%f0,%f0";
              goto end;
            case SHIFT_LSHIFTRT:
              if (TARGET_H8300H)
                info->special = "sub.w\t%f0,%f0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\textu.l\t%S0";
              else
                info->special = "sub.w\t%f0,%f0\n\trotl.l\t#2,%S0\n\textu.l\t%S0";
              goto end;
            case SHIFT_ASHIFTRT:
              abort ();
            }
        }
      else if (count == 31)
        {
          if (TARGET_H8300)
            {
              switch (shift_type)
                {
                case SHIFT_ASHIFT:
                  info->special = "sub.w\t%e0,%e0\n\tshlr\t%w0\n\tmov.w\t%e0,%f0\n\trotxr\t%z0";
                  goto end;
                case SHIFT_LSHIFTRT:
                  info->special = "sub.w\t%f0,%f0\n\tshll\t%z0\n\tmov.w\t%f0,%e0\n\trotxl\t%w0";
                  goto end;
                case SHIFT_ASHIFTRT:
                  info->special = "shll\t%z0\n\tsubx\t%w0,%w0\n\tmov.b\t%w0,%x0\n\tmov.w\t%f0,%e0";
                  goto end;
                }
            }
          else
            {
              switch (shift_type)
                {
                case SHIFT_ASHIFT:
                  info->special = "shlr.l\t%S0\n\txor.l\t%S0,%S0\n\trotxr.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                  goto end;
                case SHIFT_LSHIFTRT:
                  info->special = "shll.l\t%S0\n\txor.l\t%S0,%S0\n\trotxl.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                  goto end;
                case SHIFT_ASHIFTRT:
                  info->special = "shll\t%e0\n\tsubx\t%w0,%w0\n\texts.w\t%T0\n\texts.l\t%S0";
                  info->cc_special = CC_SET_ZNV;
                  goto end;
                }
            }
        }
      abort ();

    default:
      abort ();
    }

 end:
  if (!TARGET_H8300S)
    info->shift2 = NULL;
}

/* Given COUNT and MODE of a shift, return 1 if a scratch reg may be
   needed for some shift with COUNT and MODE.  Return 0 otherwise.  */

int
h8300_shift_needs_scratch_p (int count, enum machine_mode mode)
{
  enum h8_cpu cpu;
  int a, lr, ar;

  if (GET_MODE_BITSIZE (mode) <= count)
    return 1;

  /* Find out the target CPU.  */
  if (TARGET_H8300)
    cpu = H8_300;
  else if (TARGET_H8300H)
    cpu = H8_300H;
  else
    cpu = H8_S;

  /* Find the shift algorithm.  */
  switch (mode)
    {
    case QImode:
      a  = shift_alg_qi[cpu][SHIFT_ASHIFT][count];
      lr = shift_alg_qi[cpu][SHIFT_LSHIFTRT][count];
      ar = shift_alg_qi[cpu][SHIFT_ASHIFTRT][count];
      break;

    case HImode:
      a  = shift_alg_hi[cpu][SHIFT_ASHIFT][count];
      lr = shift_alg_hi[cpu][SHIFT_LSHIFTRT][count];
      ar = shift_alg_hi[cpu][SHIFT_ASHIFTRT][count];
      break;

    case SImode:
      a  = shift_alg_si[cpu][SHIFT_ASHIFT][count];
      lr = shift_alg_si[cpu][SHIFT_LSHIFTRT][count];
      ar = shift_alg_si[cpu][SHIFT_ASHIFTRT][count];
      break;

    default:
      abort ();
    }

  /* On H8/300H, count == 8 uses a scratch register.  */
  return (a == SHIFT_LOOP || lr == SHIFT_LOOP || ar == SHIFT_LOOP
          || (TARGET_H8300H && mode == SImode && count == 8));
}

/* Emit the assembler code for doing shifts.  */

const char *
output_a_shift (rtx *operands)
{
  static int loopend_lab;
  rtx shift = operands[3];
  enum machine_mode mode = GET_MODE (shift);
  enum rtx_code code = GET_CODE (shift);
  enum shift_type shift_type;
  enum shift_mode shift_mode;
  struct shift_info info;

  loopend_lab++;

  switch (mode)
    {
    case QImode:
      shift_mode = QIshift;
      break;
    case HImode:
      shift_mode = HIshift;
      break;
    case SImode:
      shift_mode = SIshift;
      break;
    default:
      abort ();
    }

  switch (code)
    {
    case ASHIFTRT:
      shift_type = SHIFT_ASHIFTRT;
      break;
    case LSHIFTRT:
      shift_type = SHIFT_LSHIFTRT;
      break;
    case ASHIFT:
      shift_type = SHIFT_ASHIFT;
      break;
    default:
      abort ();
    }

  if (GET_CODE (operands[2]) != CONST_INT)
    {
      /* This case must be taken care of by one of the two splitters
         that convert a variable shift into a loop.  */
      abort ();
    }
  else
    {
      int n = INTVAL (operands[2]);

      /* If the count is negative, make it 0.  */
      if (n < 0)
        n = 0;
      /* If the count is too big, truncate it.
         ANSI says shifts of GET_MODE_BITSIZE are undefined - we choose to
         do the intuitive thing.  */
      else if ((unsigned int) n > GET_MODE_BITSIZE (mode))
        n = GET_MODE_BITSIZE (mode);

      get_shift_alg (shift_type, shift_mode, n, &info);

      switch (info.alg)
        {
        case SHIFT_SPECIAL:
          output_asm_insn (info.special, operands);
          /* Fall through.  */

        case SHIFT_INLINE:
          n = info.remainder;

          /* Emit two bit shifts first.  */
          if (info.shift2 != NULL)
            {
              for (; n > 1; n -= 2)
                output_asm_insn (info.shift2, operands);
            }

          /* Now emit one bit shifts for any residual.  */
          for (; n > 0; n--)
            output_asm_insn (info.shift1, operands);
          return "";

        case SHIFT_ROT_AND:
          {
            int m = GET_MODE_BITSIZE (mode) - n;
            const int mask = (shift_type == SHIFT_ASHIFT
                              ? ((1 << m) - 1) << n
                              : (1 << m) - 1);
            char insn_buf[200];

            /* Not all possibilities of rotate are supported.  They shouldn't
               be generated, but let's watch for 'em.  */
            if (info.shift1 == 0)
              abort ();

            /* Emit two bit rotates first.  */
            if (info.shift2 != NULL)
              {
                for (; m > 1; m -= 2)
                  output_asm_insn (info.shift2, operands);
              }

            /* Now single bit rotates for any residual.  */
            for (; m > 0; m--)
              output_asm_insn (info.shift1, operands);

            /* Now mask off the high bits.  */
            if (mode == QImode)
              sprintf (insn_buf, "and\t#%d,%%X0", mask);
            else if (mode == HImode && (TARGET_H8300H || TARGET_H8300S))
              sprintf (insn_buf, "and.w\t#%d,%%T0", mask);
            else
              abort ();

            output_asm_insn (insn_buf, operands);
            return "";
          }

        case SHIFT_LOOP:
          /* A loop to shift by a "large" constant value.
             If we have shift-by-2 insns, use them.  */
          if (info.shift2 != NULL)
            {
              fprintf (asm_out_file, "\tmov.b   #%d,%sl\n", n / 2,
                       names_big[REGNO (operands[4])]);
              fprintf (asm_out_file, ".Llt%d:\n", loopend_lab);
              output_asm_insn (info.shift2, operands);
              output_asm_insn ("add     #0xff,%X4", operands);
              fprintf (asm_out_file, "\tbne     .Llt%d\n", loopend_lab);
              if (n % 2)
                output_asm_insn (info.shift1, operands);
            }
          else
            {
              fprintf (asm_out_file, "\tmov.b   #%d,%sl\n", n,
                       names_big[REGNO (operands[4])]);
              fprintf (asm_out_file, ".Llt%d:\n", loopend_lab);
              output_asm_insn (info.shift1, operands);
              output_asm_insn ("add     #0xff,%X4", operands);
              fprintf (asm_out_file, "\tbne     .Llt%d\n", loopend_lab);
            }
          return "";

        default:
          abort ();
        }
    }
}

static unsigned int
h8300_asm_insn_count (const char *template)
{
  unsigned int count = 1;

  for (; *template; template++)
    if (*template == '\n')
      count++;

  return count;
}

unsigned int
compute_a_shift_length (rtx insn ATTRIBUTE_UNUSED, rtx *operands)
{
  rtx shift = operands[3];
  enum machine_mode mode = GET_MODE (shift);
  enum rtx_code code = GET_CODE (shift);
  enum shift_type shift_type;
  enum shift_mode shift_mode;
  struct shift_info info;
  unsigned int wlength = 0;

  switch (mode)
    {
    case QImode:
      shift_mode = QIshift;
      break;
    case HImode:
      shift_mode = HIshift;
      break;
    case SImode:
      shift_mode = SIshift;
      break;
    default:
      abort ();
    }

  switch (code)
    {
    case ASHIFTRT:
      shift_type = SHIFT_ASHIFTRT;
      break;
    case LSHIFTRT:
      shift_type = SHIFT_LSHIFTRT;
      break;
    case ASHIFT:
      shift_type = SHIFT_ASHIFT;
      break;
    default:
      abort ();
    }

  if (GET_CODE (operands[2]) != CONST_INT)
    {
      /* Get the assembler code to do one shift.  */
      get_shift_alg (shift_type, shift_mode, 1, &info);

      return (4 + h8300_asm_insn_count (info.shift1)) * 2;
    }
  else
    {
      int n = INTVAL (operands[2]);

      /* If the count is negative, make it 0.  */
      if (n < 0)
        n = 0;
      /* If the count is too big, truncate it.
         ANSI says shifts of GET_MODE_BITSIZE are undefined - we choose to
         do the intuitive thing.  */
      else if ((unsigned int) n > GET_MODE_BITSIZE (mode))
        n = GET_MODE_BITSIZE (mode);

      get_shift_alg (shift_type, shift_mode, n, &info);

      switch (info.alg)
        {
        case SHIFT_SPECIAL:
          wlength += h8300_asm_insn_count (info.special);

          /* Every assembly instruction used in SHIFT_SPECIAL case
             takes 2 bytes except xor.l, which takes 4 bytes, so if we
             see xor.l, we just pretend that xor.l counts as two insns
             so that the insn length will be computed correctly.  */
          if (strstr (info.special, "xor.l") != NULL)
            wlength++;

          /* Fall through.  */

        case SHIFT_INLINE:
          n = info.remainder;

          if (info.shift2 != NULL)
            {
              wlength += h8300_asm_insn_count (info.shift2) * (n / 2);
              n = n % 2;
            }

          wlength += h8300_asm_insn_count (info.shift1) * n;

          return 2 * wlength;

        case SHIFT_ROT_AND:
          {
            int m = GET_MODE_BITSIZE (mode) - n;

            /* Not all possibilities of rotate are supported.  They shouldn't
               be generated, but let's watch for 'em.  */
            if (info.shift1 == 0)
              abort ();

            if (info.shift2 != NULL)
              {
                wlength += h8300_asm_insn_count (info.shift2) * (m / 2);
                m = m % 2;
              }

            wlength += h8300_asm_insn_count (info.shift1) * m;

            /* Now mask off the high bits.  */
            switch (mode)
              {
              case QImode:
                wlength += 1;
                break;
              case HImode:
                wlength += 2;
                break;
              case SImode:
                if (TARGET_H8300)
                  abort ();
                wlength += 3;
                break;
              default:
                abort ();
              }
            return 2 * wlength;
          }

        case SHIFT_LOOP:
          /* A loop to shift by a "large" constant value.
             If we have shift-by-2 insns, use them.  */
          if (info.shift2 != NULL)
            {
              wlength += 3 + h8300_asm_insn_count (info.shift2);
              if (n % 2)
                wlength += h8300_asm_insn_count (info.shift1);
            }
          else
            {
              wlength += 3 + h8300_asm_insn_count (info.shift1);
            }
          return 2 * wlength;

        default:
          abort ();
        }
    }
}

int
compute_a_shift_cc (rtx insn ATTRIBUTE_UNUSED, rtx *operands)
{
  rtx shift = operands[3];
  enum machine_mode mode = GET_MODE (shift);
  enum rtx_code code = GET_CODE (shift);
  enum shift_type shift_type;
  enum shift_mode shift_mode;
  struct shift_info info;

  switch (mode)
    {
    case QImode:
      shift_mode = QIshift;
      break;
    case HImode:
      shift_mode = HIshift;
      break;
    case SImode:
      shift_mode = SIshift;
      break;
    default:
      abort ();
    }

  switch (code)
    {
    case ASHIFTRT:
      shift_type = SHIFT_ASHIFTRT;
      break;
    case LSHIFTRT:
      shift_type = SHIFT_LSHIFTRT;
      break;
    case ASHIFT:
      shift_type = SHIFT_ASHIFT;
      break;
    default:
      abort ();
    }

  if (GET_CODE (operands[2]) != CONST_INT)
    {
      /* This case must be taken care of by one of the two splitters
         that convert a variable shift into a loop.  */
      abort ();
    }
  else
    {
      int n = INTVAL (operands[2]);

      /* If the count is negative, make it 0.  */
      if (n < 0)
        n = 0;
      /* If the count is too big, truncate it.
         ANSI says shifts of GET_MODE_BITSIZE are undefined - we choose to
         do the intuitive thing.  */
      else if ((unsigned int) n > GET_MODE_BITSIZE (mode))
        n = GET_MODE_BITSIZE (mode);

      get_shift_alg (shift_type, shift_mode, n, &info);

      switch (info.alg)
        {
        case SHIFT_SPECIAL:
          if (info.remainder == 0)
            return info.cc_special;

          /* Fall through.  */

        case SHIFT_INLINE:
          return info.cc_inline;

        case SHIFT_ROT_AND:
          /* This case always ends with an and instruction.  */
          return CC_SET_ZNV;

        case SHIFT_LOOP:
          /* A loop to shift by a "large" constant value.
             If we have shift-by-2 insns, use them.  */
          if (info.shift2 != NULL)
            {
              if (n % 2)
                return info.cc_inline;
            }
          return CC_CLOBBER;

        default:
          abort ();
        }
    }
}
\f
/* A rotation by a non-constant will cause a loop to be generated, in
   which a rotation by one bit is used.  A rotation by a constant,
   including the one in the loop, will be taken care of by
   emit_a_rotate () at the insn emit time.  */

int
expand_a_rotate (enum rtx_code code, rtx operands[])
{
  rtx dst = operands[0];
  rtx src = operands[1];
  rtx rotate_amount = operands[2];
  enum machine_mode mode = GET_MODE (dst);
  rtx tmp;

  /* We rotate in place.  */
  emit_move_insn (dst, src);

  if (GET_CODE (rotate_amount) != CONST_INT)
    {
      rtx counter = gen_reg_rtx (QImode);
      rtx start_label = gen_label_rtx ();
      rtx end_label = gen_label_rtx ();

      /* If the rotate amount is less than or equal to 0,
         we go out of the loop.  */
      emit_cmp_and_jump_insns (rotate_amount, GEN_INT (0), LE, NULL_RTX,
                               QImode, 0, end_label);

      /* Initialize the loop counter.  */
      emit_move_insn (counter, rotate_amount);

      emit_label (start_label);

      /* Rotate by one bit.  */
      tmp = gen_rtx (code, mode, dst, GEN_INT (1));
      emit_insn (gen_rtx_SET (mode, dst, tmp));

      /* Decrement the counter by 1.  */
      tmp = gen_rtx_PLUS (QImode, counter, GEN_INT (-1));
      emit_insn (gen_rtx_SET (VOIDmode, counter, tmp));

      /* If the loop counter is nonzero, we go back to the beginning
         of the loop.  */
      emit_cmp_and_jump_insns (counter, GEN_INT (0), NE, NULL_RTX, QImode, 1,
                               start_label);

      emit_label (end_label);
    }
  else
    {
      /* Rotate by AMOUNT bits.  */
      tmp = gen_rtx (code, mode, dst, rotate_amount);
      emit_insn (gen_rtx_SET (mode, dst, tmp));
    }

  return 1;
}

/* Emit rotate insns.  */

const char *
emit_a_rotate (enum rtx_code code, rtx *operands)
{
  rtx dst = operands[0];
  rtx rotate_amount = operands[2];
  enum shift_mode rotate_mode;
  enum shift_type rotate_type;
  const char *insn_buf;
  int bits;
  int amount;
  enum machine_mode mode = GET_MODE (dst);

  if (GET_CODE (rotate_amount) != CONST_INT)
    abort ();

  switch (mode)
    {
    case QImode:
      rotate_mode = QIshift;
      break;
    case HImode:
      rotate_mode = HIshift;
      break;
    case SImode:
      rotate_mode = SIshift;
      break;
    default:
      abort ();
    }

  switch (code)
    {
    case ROTATERT:
      rotate_type = SHIFT_ASHIFT;
      break;
    case ROTATE:
      rotate_type = SHIFT_LSHIFTRT;
      break;
    default:
      abort ();
    }

  amount = INTVAL (rotate_amount);

  /* Clean up AMOUNT.  */
  if (amount < 0)
    amount = 0;
  if ((unsigned int) amount > GET_MODE_BITSIZE (mode))
    amount = GET_MODE_BITSIZE (mode);

  /* Determine the faster direction.  After this phase, amount will be
     at most a half of GET_MODE_BITSIZE (mode).  */
  if ((unsigned int) amount > GET_MODE_BITSIZE (mode) / (unsigned) 2)
    {
      /* Flip the direction.  */
      amount = GET_MODE_BITSIZE (mode) - amount;
      rotate_type =
        (rotate_type == SHIFT_ASHIFT) ? SHIFT_LSHIFTRT : SHIFT_ASHIFT;
    }

  /* See if a byte swap (in HImode) or a word swap (in SImode) can
     boost up the rotation.  */
  if ((mode == HImode && TARGET_H8300 && amount >= 5)
      || (mode == HImode && TARGET_H8300H && amount >= 6)
      || (mode == HImode && TARGET_H8300S && amount == 8)
      || (mode == SImode && TARGET_H8300H && amount >= 10)
      || (mode == SImode && TARGET_H8300S && amount >= 13))
    {
      switch (mode)
        {
        case HImode:
          /* This code works on any family.  */
          insn_buf = "xor.b\t%s0,%t0\n\txor.b\t%t0,%s0\n\txor.b\t%s0,%t0";
          output_asm_insn (insn_buf, operands);
          break;

        case SImode:
          /* This code works on the H8/300H and H8S.  */
          insn_buf = "xor.w\t%e0,%f0\n\txor.w\t%f0,%e0\n\txor.w\t%e0,%f0";
          output_asm_insn (insn_buf, operands);
          break;

        default:
          abort ();
        }

      /* Adjust AMOUNT and flip the direction.  */
      amount = GET_MODE_BITSIZE (mode) / 2 - amount;
      rotate_type =
        (rotate_type == SHIFT_ASHIFT) ? SHIFT_LSHIFTRT : SHIFT_ASHIFT;
    }

  /* Emit rotate insns.  */
  for (bits = TARGET_H8300S ? 2 : 1; bits > 0; bits /= 2)
    {
      if (bits == 2)
        insn_buf = rotate_two[rotate_type][rotate_mode];
      else
        insn_buf = rotate_one[cpu_type][rotate_type][rotate_mode];

      for (; amount >= bits; amount -= bits)
        output_asm_insn (insn_buf, operands);
    }

  return "";
}
\f
/* Fix the operands of a gen_xxx so that it could become a bit
   operating insn.  */

int
fix_bit_operand (rtx *operands, int what, enum rtx_code type)
{
  /* The bit_operand predicate accepts any memory during RTL generation, but
     only 'U' memory afterwards, so if this is a MEM operand, we must force
     it to be valid for 'U' by reloading the address.  */

  if ((what == 0 && single_zero_operand (operands[2], QImode))
      || (what == 1 && single_one_operand (operands[2], QImode)))
    {
      /* OK to have a memory dest.  */
      if (GET_CODE (operands[0]) == MEM
          && !EXTRA_CONSTRAINT (operands[0], 'U'))
        {
          rtx mem = gen_rtx_MEM (GET_MODE (operands[0]),
                                 copy_to_mode_reg (Pmode,
                                                   XEXP (operands[0], 0)));
          MEM_COPY_ATTRIBUTES (mem, operands[0]);
          operands[0] = mem;
        }

      if (GET_CODE (operands[1]) == MEM
          && !EXTRA_CONSTRAINT (operands[1], 'U'))
        {
          rtx mem = gen_rtx_MEM (GET_MODE (operands[1]),
                                 copy_to_mode_reg (Pmode,
                                                   XEXP (operands[1], 0)));
          MEM_COPY_ATTRIBUTES (mem, operands[0]);
          operands[1] = mem;
        }
      return 0;
    }

  /* Dest and src op must be register.  */

  operands[1] = force_reg (QImode, operands[1]);
  {
    rtx res = gen_reg_rtx (QImode);
    emit_insn (gen_rtx_SET (VOIDmode, res,
                            gen_rtx (type, QImode, operands[1], operands[2])));
    emit_insn (gen_rtx_SET (VOIDmode, operands[0], res));
  }
  return 1;
}

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

static int
h8300_interrupt_function_p (tree func)
{
  tree a;

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

  a = lookup_attribute ("interrupt_handler", DECL_ATTRIBUTES (func));
  return a != NULL_TREE;
}

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

static int
h8300_os_task_function_p (tree func)
{
  tree a;

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

  a = lookup_attribute ("OS_Task", DECL_ATTRIBUTES (func));
  return a != NULL_TREE;
}

/* Return nonzero if FUNC is a monitor function as specified
   by the "monitor" attribute.  */

static int
h8300_monitor_function_p (tree func)
{
  tree a;

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

  a = lookup_attribute ("monitor", DECL_ATTRIBUTES (func));
  return a != NULL_TREE;
}

/* Return nonzero if FUNC is a function that should be called
   through the function vector.  */

int
h8300_funcvec_function_p (tree func)
{
  tree a;

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

  a = lookup_attribute ("function_vector", DECL_ATTRIBUTES (func));
  return a != NULL_TREE;
}

/* Return nonzero if DECL is a variable that's in the eight bit
   data area.  */

int
h8300_eightbit_data_p (tree decl)
{
  tree a;

  if (TREE_CODE (decl) != VAR_DECL)
    return 0;

  a = lookup_attribute ("eightbit_data", DECL_ATTRIBUTES (decl));
  return a != NULL_TREE;
}

/* Return nonzero if DECL is a variable that's in the tiny
   data area.  */

int
h8300_tiny_data_p (tree decl)
{
  tree a;

  if (TREE_CODE (decl) != VAR_DECL)
    return 0;

  a = lookup_attribute ("tiny_data", DECL_ATTRIBUTES (decl));
  return a != NULL_TREE;
}

/* Generate an 'interrupt_handler' attribute for decls.  */

static void
h8300_insert_attributes (tree node, tree *attributes)
{
  if (!pragma_interrupt
      || TREE_CODE (node) != FUNCTION_DECL)
    return;

  pragma_interrupt = 0;

  /* Add an 'interrupt_handler' attribute.  */
  *attributes = tree_cons (get_identifier ("interrupt_handler"),
                           NULL, *attributes);
}

/* Supported attributes:

   interrupt_handler: output a prologue and epilogue suitable for an
   interrupt handler.

   function_vector: This function should be called through the
   function vector.

   eightbit_data: This variable lives in the 8-bit data area and can
   be referenced with 8-bit absolute memory addresses.

   tiny_data: This variable lives in the tiny data area and can be
   referenced with 16-bit absolute memory references.  */

const struct attribute_spec h8300_attribute_table[] =
{
  /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
  { "interrupt_handler", 0, 0, true,  false, false, h8300_handle_fndecl_attribute },
  { "OS_Task",           0, 0, true,  false, false, h8300_handle_fndecl_attribute },
  { "monitor",           0, 0, true,  false, false, h8300_handle_fndecl_attribute },
  { "function_vector",   0, 0, true,  false, false, h8300_handle_fndecl_attribute },
  { "eightbit_data",     0, 0, true,  false, false, h8300_handle_eightbit_data_attribute },
  { "tiny_data",         0, 0, true,  false, false, h8300_handle_tiny_data_attribute },
  { NULL,                0, 0, false, false, false, NULL }
};


/* Handle an attribute requiring a FUNCTION_DECL; arguments as in
   struct attribute_spec.handler.  */
static tree
h8300_handle_fndecl_attribute (tree *node, tree name,
                               tree args ATTRIBUTE_UNUSED,
                               int flags ATTRIBUTE_UNUSED,
                               bool *no_add_attrs)
{
  if (TREE_CODE (*node) != FUNCTION_DECL)
    {
      warning ("`%s' attribute only applies to functions",
               IDENTIFIER_POINTER (name));
      *no_add_attrs = true;
    }

  return NULL_TREE;
}

/* Handle an "eightbit_data" attribute; arguments as in
   struct attribute_spec.handler.  */
static tree
h8300_handle_eightbit_data_attribute (tree *node, tree name,
                                      tree args ATTRIBUTE_UNUSED,
                                      int flags ATTRIBUTE_UNUSED,
                                      bool *no_add_attrs)
{
  tree decl = *node;

  if (TREE_STATIC (decl) || DECL_EXTERNAL (decl))
    {
      DECL_SECTION_NAME (decl) = build_string (7, ".eight");
    }
  else
    {
      warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
      *no_add_attrs = true;
    }

  return NULL_TREE;
}

/* Handle an "tiny_data" attribute; arguments as in
   struct attribute_spec.handler.  */
static tree
h8300_handle_tiny_data_attribute (tree *node, tree name,
                                  tree args ATTRIBUTE_UNUSED,
                                  int flags ATTRIBUTE_UNUSED,
                                  bool *no_add_attrs)
{
  tree decl = *node;

  if (TREE_STATIC (decl) || DECL_EXTERNAL (decl))
    {
      DECL_SECTION_NAME (decl) = build_string (6, ".tiny");
    }
  else
    {
      warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
      *no_add_attrs = true;
    }

  return NULL_TREE;
}

/* Mark function vectors, and various small data objects.  */

static void
h8300_encode_section_info (tree decl, rtx rtl, int first)
{
  int extra_flags = 0;

  default_encode_section_info (decl, rtl, first);

  if (TREE_CODE (decl) == FUNCTION_DECL
      && h8300_funcvec_function_p (decl))
    extra_flags = SYMBOL_FLAG_FUNCVEC_FUNCTION;
  else if (TREE_CODE (decl) == VAR_DECL
           && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
    {
      if (h8300_eightbit_data_p (decl))
        extra_flags = SYMBOL_FLAG_EIGHTBIT_DATA;
      else if (first && h8300_tiny_data_p (decl))
        extra_flags = SYMBOL_FLAG_TINY_DATA;
    }

  if (extra_flags)
    SYMBOL_REF_FLAGS (XEXP (rtl, 0)) |= extra_flags;
}

const char *
output_simode_bld (int bild, rtx operands[])
{
  if (TARGET_H8300)
    {
      /* Clear the destination register.  */
      output_asm_insn ("sub.w\t%e0,%e0\n\tsub.w\t%f0,%f0", operands);

      /* Now output the bit load or bit inverse load, and store it in
         the destination.  */
      if (bild)
        output_asm_insn ("bild\t%Z2,%Y1", operands);
      else
        output_asm_insn ("bld\t%Z2,%Y1", operands);

      output_asm_insn ("bst\t#0,%w0", operands);
    }
  else
    {
      /* Determine if we can clear the destination first.  */
      int clear_first = (REG_P (operands[0]) && REG_P (operands[1])
                         && REGNO (operands[0]) != REGNO (operands[1]));

      if (clear_first)
        output_asm_insn ("sub.l\t%S0,%S0", operands);

      /* Output the bit load or bit inverse load.  */
      if (bild)
        output_asm_insn ("bild\t%Z2,%Y1", operands);
      else
        output_asm_insn ("bld\t%Z2,%Y1", operands);

      if (!clear_first)
        output_asm_insn ("xor.l\t%S0,%S0", operands);

      /* Perform the bit store.  */
      output_asm_insn ("bst\t#0,%w0", operands);
    }

  /* All done.  */
  return "";
}

/* Given INSN and its current length LENGTH, return the adjustment
   (in bytes) to correctly compute INSN's length.

   We use this to get the lengths of various memory references correct.  */

int
h8300_adjust_insn_length (rtx insn, int length ATTRIBUTE_UNUSED)
{
  rtx pat = PATTERN (insn);

  /* We must filter these out before calling get_attr_adjust_length.  */
  if (GET_CODE (pat) == USE
      || GET_CODE (pat) == CLOBBER
      || GET_CODE (pat) == SEQUENCE
      || GET_CODE (pat) == ADDR_VEC
      || GET_CODE (pat) == ADDR_DIFF_VEC)
    return 0;

  if (get_attr_adjust_length (insn) == ADJUST_LENGTH_NO)
    return 0;

  /* Adjust length for reg->mem and mem->reg copies.  */
  if (GET_CODE (pat) == SET
      && (GET_CODE (SET_SRC (pat)) == MEM
          || GET_CODE (SET_DEST (pat)) == MEM))
    {
      /* This insn might need a length adjustment.  */
      rtx addr;

      if (GET_CODE (SET_SRC (pat)) == MEM)
        addr = XEXP (SET_SRC (pat), 0);
      else
        addr = XEXP (SET_DEST (pat), 0);

      if (TARGET_H8300)
        {
          /* On the H8/300, we subtract the difference between the
             actual length and the longest one, which is @(d:16,ERs).  */

          /* @Rs is 2 bytes shorter than the longest.  */
          if (GET_CODE (addr) == REG)
            return -2;

          /* @aa:8 is 2 bytes shorter than the longest.  */
          if (GET_MODE (SET_SRC (pat)) == QImode
              && h8300_eightbit_constant_address_p (addr))
            return -2;
        }
      else
        {
          /* On the H8/300H and H8S, we subtract the difference
             between the actual length and the longest one, which is
             @(d:24,ERs).  */

          /* @ERs is 6 bytes shorter than the longest.  */
          if (GET_CODE (addr) == REG)
            return -6;

          /* @(d:16,ERs) is 6 bytes shorter than the longest.  */
          if (GET_CODE (addr) == PLUS
              && GET_CODE (XEXP (addr, 0)) == REG
              && GET_CODE (XEXP (addr, 1)) == CONST_INT
              && INTVAL (XEXP (addr, 1)) > -32768
              && INTVAL (XEXP (addr, 1)) < 32767)
            return -4;

          /* @aa:8 is 6 bytes shorter than the longest.  */
          if (GET_MODE (SET_SRC (pat)) == QImode
              && h8300_eightbit_constant_address_p (addr))
            return -6;

          /* @aa:16 is 4 bytes shorter than the longest.  */
          if (h8300_tiny_constant_address_p (addr))
            return -4;

          /* @aa:24 is 2 bytes shorter than the longest.  */
          if (GET_CODE (addr) == CONST_INT)
            return -2;
        }
    }

  /* Loading some constants needs adjustment.  */
  if (GET_CODE (pat) == SET
      && GET_CODE (SET_SRC (pat)) == CONST_INT
      && GET_MODE (SET_DEST (pat)) == SImode
      && INTVAL (SET_SRC (pat)) != 0)
    {
      int val = INTVAL (SET_SRC (pat));

      if (TARGET_H8300
          && ((val & 0xffff) == 0
              || ((val >> 16) & 0xffff) == 0))
        return -2;

      if (TARGET_H8300H || TARGET_H8300S)
        {
          if (val == (val & 0xff)
              || val == (val & 0xff00))
            return 4 - 6;

          switch (val & 0xffffffff)
            {
            case 0xffffffff:
            case 0xfffffffe:
            case 0xfffffffc:
            case 0x0000ffff:
            case 0x0000fffe:
            case 0xffff0000:
            case 0xfffe0000:
            case 0x00010000:
            case 0x00020000:
              return 4 - 6;
            }
        }
    }

  /* Rotations need various adjustments.  */
  if (GET_CODE (pat) == SET
      && (GET_CODE (SET_SRC (pat)) == ROTATE
          || GET_CODE (SET_SRC (pat)) == ROTATERT))
    {
      rtx src = SET_SRC (pat);
      enum machine_mode mode = GET_MODE (src);
      int amount;
      int states = 0;

      if (GET_CODE (XEXP (src, 1)) != CONST_INT)
        return 0;

      amount = INTVAL (XEXP (src, 1));

      /* Clean up AMOUNT.  */
      if (amount < 0)
        amount = 0;
      if ((unsigned int) amount > GET_MODE_BITSIZE (mode))
        amount = GET_MODE_BITSIZE (mode);

      /* Determine the faster direction.  After this phase, amount
         will be at most a half of GET_MODE_BITSIZE (mode).  */
      if ((unsigned int) amount > GET_MODE_BITSIZE (mode) / (unsigned) 2)
        /* Flip the direction.  */
        amount = GET_MODE_BITSIZE (mode) - amount;

      /* See if a byte swap (in HImode) or a word swap (in SImode) can
         boost up the rotation.  */
      if ((mode == HImode && TARGET_H8300 && amount >= 5)
          || (mode == HImode && TARGET_H8300H && amount >= 6)
          || (mode == HImode && TARGET_H8300S && amount == 8)
          || (mode == SImode && TARGET_H8300H && amount >= 10)
          || (mode == SImode && TARGET_H8300S && amount >= 13))
        {
          /* Adjust AMOUNT and flip the direction.  */
          amount = GET_MODE_BITSIZE (mode) / 2 - amount;
          states += 6;
        }

      /* We use 2-bit rotations on the H8S.  */
      if (TARGET_H8300S)
        amount = amount / 2 + amount % 2;

      /* The H8/300 uses three insns to rotate one bit, taking 6
         states.  */
      states += amount * ((TARGET_H8300 && mode == HImode) ? 6 : 2);

      return -(20 - states);
    }

  return 0;
}

#ifndef OBJECT_FORMAT_ELF
static void
h8300_asm_named_section (const char *name, unsigned int flags ATTRIBUTE_UNUSED)
{
  /* ??? Perhaps we should be using default_coff_asm_named_section.  */
  fprintf (asm_out_file, "\t.section %s\n", name);
}
#endif /* ! OBJECT_FORMAT_ELF */

/* Nonzero if X is a constant address suitable as an 8-bit absolute,
   which is a special case of the 'R' operand.  */

int
h8300_eightbit_constant_address_p (rtx x)
{
  /* The ranges of the 8-bit area. */
  const unsigned HOST_WIDE_INT n1 = trunc_int_for_mode (0xff00, HImode);
  const unsigned HOST_WIDE_INT n2 = trunc_int_for_mode (0xffff, HImode);
  const unsigned HOST_WIDE_INT h1 = trunc_int_for_mode (0x00ffff00, SImode);
  const unsigned HOST_WIDE_INT h2 = trunc_int_for_mode (0x00ffffff, SImode);
  const unsigned HOST_WIDE_INT s1 = trunc_int_for_mode (0xffffff00, SImode);
  const unsigned HOST_WIDE_INT s2 = trunc_int_for_mode (0xffffffff, SImode);

  unsigned HOST_WIDE_INT addr;

  /* We accept symbols declared with eightbit_data.  */
  if (GET_CODE (x) == SYMBOL_REF)
    return (SYMBOL_REF_FLAGS (x) & SYMBOL_FLAG_EIGHTBIT_DATA) != 0;

  if (GET_CODE (x) != CONST_INT)
    return 0;

  addr = INTVAL (x);

  return (0
          || ((TARGET_H8300 || TARGET_NORMAL_MODE) && IN_RANGE (addr, n1, n2))
          || (TARGET_H8300H && IN_RANGE (addr, h1, h2))
          || (TARGET_H8300S && IN_RANGE (addr, s1, s2)));
}

/* Nonzero if X is a constant address suitable as an 16-bit absolute
   on H8/300H and H8S.  */

int
h8300_tiny_constant_address_p (rtx x)
{
  /* The ranges of the 16-bit area.  */
  const unsigned HOST_WIDE_INT h1 = trunc_int_for_mode (0x00000000, SImode);
  const unsigned HOST_WIDE_INT h2 = trunc_int_for_mode (0x00007fff, SImode);
  const unsigned HOST_WIDE_INT h3 = trunc_int_for_mode (0x00ff8000, SImode);
  const unsigned HOST_WIDE_INT h4 = trunc_int_for_mode (0x00ffffff, SImode);
  const unsigned HOST_WIDE_INT s1 = trunc_int_for_mode (0x00000000, SImode);
  const unsigned HOST_WIDE_INT s2 = trunc_int_for_mode (0x00007fff, SImode);
  const unsigned HOST_WIDE_INT s3 = trunc_int_for_mode (0xffff8000, SImode);
  const unsigned HOST_WIDE_INT s4 = trunc_int_for_mode (0xffffffff, SImode);

  unsigned HOST_WIDE_INT addr;

  /* We accept symbols declared with tiny_data.  */
  if (GET_CODE (x) == SYMBOL_REF)
    return (SYMBOL_REF_FLAGS (x) & SYMBOL_FLAG_TINY_DATA) != 0;

  if (GET_CODE (x) != CONST_INT)
    return 0;

  addr = INTVAL (x);

  return (0
          || TARGET_NORMAL_MODE
          || (TARGET_H8300H
              && (IN_RANGE (addr, h1, h2) || IN_RANGE (addr, h3, h4)))
          || (TARGET_H8300S
              && (IN_RANGE (addr, s1, s2) || IN_RANGE (addr, s3, s4))));
}

int
byte_accesses_mergeable_p (rtx addr1, rtx addr2)
{
  HOST_WIDE_INT offset1, offset2;
  rtx reg1, reg2;

  if (REG_P (addr1))
    {
      reg1 = addr1;
      offset1 = 0;
    }
  else if (GET_CODE (addr1) == PLUS
           && REG_P (XEXP (addr1, 0))
           && GET_CODE (XEXP (addr1, 1)) == CONST_INT)
    {
      reg1 = XEXP (addr1, 0);
      offset1 = INTVAL (XEXP (addr1, 1));
    }
  else
    return 0;

  if (REG_P (addr2))
    {
      reg2 = addr2;
      offset2 = 0;
    }
  else if (GET_CODE (addr2) == PLUS
           && REG_P (XEXP (addr2, 0))
           && GET_CODE (XEXP (addr2, 1)) == CONST_INT)
    {
      reg2 = XEXP (addr2, 0);
      offset2 = INTVAL (XEXP (addr2, 1));
    }
  else
    return 0;

  if (((reg1 == stack_pointer_rtx && reg2 == stack_pointer_rtx)
       || (reg1 == frame_pointer_rtx && reg2 == frame_pointer_rtx))
      && offset1 % 2 == 0
      && offset1 + 1 == offset2)
    return 1;

  return 0;
}
\f
/* Initialize the GCC target structure.  */
#undef TARGET_ATTRIBUTE_TABLE
#define TARGET_ATTRIBUTE_TABLE h8300_attribute_table

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

#undef TARGET_ASM_FUNCTION_EPILOGUE
#define TARGET_ASM_FUNCTION_EPILOGUE h8300_output_function_epilogue

#undef TARGET_ASM_FILE_START
#define TARGET_ASM_FILE_START h8300_file_start
#undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true

#undef TARGET_ASM_FILE_END
#define TARGET_ASM_FILE_END h8300_file_end

#undef TARGET_ENCODE_SECTION_INFO
#define TARGET_ENCODE_SECTION_INFO h8300_encode_section_info

#undef TARGET_INSERT_ATTRIBUTES
#define TARGET_INSERT_ATTRIBUTES h8300_insert_attributes

#undef TARGET_RTX_COSTS
#define TARGET_RTX_COSTS h8300_rtx_costs

struct gcc_target targetm = TARGET_INITIALIZER;