epiphany.opt (mfp-iarith): New option.

[gcc.git] / gcc / config / epiphany / epiphany.c

/* Subroutines used for code generation on the EPIPHANY cpu.
   Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2004, 2005, 2006, 2007, 2009-2012 Free Software Foundation, Inc.
   Contributed by Embecosm on behalf of Adapteva, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

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

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "real.h"
#include "insn-config.h"
#include "conditions.h"
#include "output.h"
#include "insn-attr.h"
#include "flags.h"
#include "function.h"
#include "expr.h"
#include "diagnostic-core.h"
#include "recog.h"
#include "toplev.h"
#include "tm_p.h"
#include "target.h"
#include "df.h"
#include "langhooks.h"
#include "insn-codes.h"
#include "ggc.h"
#include "tm-constrs.h"
#include "tree-pass.h"  /* for current_pass */

/* Which cpu we're compiling for.  */
int epiphany_cpu_type;

/* Name of mangle string to add to symbols to separate code compiled for each
   cpu (or NULL).  */
const char *epiphany_mangle_cpu;

/* Array of valid operand punctuation characters.  */
char epiphany_punct_chars[256];

/* The rounding mode that we generally use for floating point.  */
int epiphany_normal_fp_rounding;

static void epiphany_init_reg_tables (void);
static int get_epiphany_condition_code (rtx);
static tree epiphany_handle_interrupt_attribute (tree *, tree, tree, int, bool *);
static tree epiphany_handle_forwarder_attribute (tree *, tree, tree, int,
                                                 bool *);
static bool epiphany_pass_by_reference (cumulative_args_t, enum machine_mode,
                                        const_tree, bool);
static rtx frame_insn (rtx);
\f
/* defines for the initialization of the GCC target structure.  */
#define TARGET_ATTRIBUTE_TABLE epiphany_attribute_table

#define TARGET_PRINT_OPERAND epiphany_print_operand
#define TARGET_PRINT_OPERAND_ADDRESS epiphany_print_operand_address

#define TARGET_RTX_COSTS epiphany_rtx_costs
#define TARGET_ADDRESS_COST epiphany_address_cost
#define TARGET_MEMORY_MOVE_COST epiphany_memory_move_cost

#define TARGET_PROMOTE_FUNCTION_MODE epiphany_promote_function_mode
#define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true

#define TARGET_RETURN_IN_MEMORY epiphany_return_in_memory
#define TARGET_PASS_BY_REFERENCE epiphany_pass_by_reference
#define TARGET_CALLEE_COPIES hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true
#define TARGET_FUNCTION_VALUE epiphany_function_value
#define TARGET_LIBCALL_VALUE epiphany_libcall_value
#define TARGET_FUNCTION_VALUE_REGNO_P epiphany_function_value_regno_p

#define TARGET_SETUP_INCOMING_VARARGS epiphany_setup_incoming_varargs

/* Using the simplistic varags handling forces us to do partial reg/stack
   argument passing for types with larger size (> 4 bytes) than alignemnt.  */
#define TARGET_ARG_PARTIAL_BYTES epiphany_arg_partial_bytes

#define TARGET_FUNCTION_OK_FOR_SIBCALL epiphany_function_ok_for_sibcall

#define TARGET_SCHED_ISSUE_RATE epiphany_issue_rate
#define TARGET_SCHED_ADJUST_COST epiphany_adjust_cost

#define TARGET_LEGITIMATE_ADDRESS_P epiphany_legitimate_address_p

#define TARGET_SECONDARY_RELOAD epiphany_secondary_reload

#define TARGET_OPTION_OVERRIDE epiphany_override_options

#define TARGET_CONDITIONAL_REGISTER_USAGE epiphany_conditional_register_usage

#define TARGET_FUNCTION_ARG epiphany_function_arg

#define TARGET_FUNCTION_ARG_ADVANCE epiphany_function_arg_advance

#define TARGET_FUNCTION_ARG_BOUNDARY epiphany_function_arg_boundary

#define TARGET_TRAMPOLINE_INIT epiphany_trampoline_init

/* Nonzero if the constant rtx value is a legitimate general operand.
   We can handle any 32- or 64-bit constant.  */
#define TARGET_LEGITIMATE_CONSTANT_P hook_bool_mode_rtx_true

#define TARGET_MIN_DIVISIONS_FOR_RECIP_MUL \
  epiphany_min_divisions_for_recip_mul

#define TARGET_VECTORIZE_PREFERRED_SIMD_MODE epiphany_preferred_simd_mode

#define TARGET_VECTOR_MODE_SUPPORTED_P epiphany_vector_mode_supported_p

#define TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE \
  epiphany_vector_alignment_reachable

#define TARGET_VECTORIZE_SUPPORT_VECTOR_MISALIGNMENT \
  epiphany_support_vector_misalignment

#define TARGET_ASM_CAN_OUTPUT_MI_THUNK \
  hook_bool_const_tree_hwi_hwi_const_tree_true
#define TARGET_ASM_OUTPUT_MI_THUNK epiphany_output_mi_thunk

#include "target-def.h"

#undef TARGET_ASM_ALIGNED_HI_OP
#define TARGET_ASM_ALIGNED_HI_OP "\t.hword\t"
#undef TARGET_ASM_ALIGNED_SI_OP
#define TARGET_ASM_ALIGNED_SI_OP "\t.word\t"
\f
bool
epiphany_is_interrupt_p (tree decl)
{
  tree attrs;

  attrs = DECL_ATTRIBUTES (decl);
  if (lookup_attribute ("interrupt", attrs))
    return true;
  else
    return false;
}

/* Called from epiphany_override_options.
   We use this to initialize various things.  */

static void
epiphany_init (void)
{
  /* N.B. this pass must not run before the first optimize_mode_switching
     pass because of the side offect of epiphany_mode_needed on
     MACHINE_FUNCTION(cfun)->unknown_mode_uses.  But it must run before
     pass_resolve_sw_modes.  */
  static struct register_pass_info insert_use_info
    = { &pass_mode_switch_use.pass, "mode_sw",
        1, PASS_POS_INSERT_AFTER
      };
  static struct register_pass_info mode_sw2_info
    = { &pass_mode_switching.pass, "mode_sw",
        1, PASS_POS_INSERT_AFTER
      };
  static struct register_pass_info mode_sw3_info
    = { &pass_resolve_sw_modes.pass, "mode_sw",
        1, PASS_POS_INSERT_AFTER
      };
  static struct register_pass_info mode_sw4_info
    = { &pass_split_all_insns.pass, "mode_sw",
        1, PASS_POS_INSERT_AFTER
      };

  epiphany_init_reg_tables ();

  /* Initialize array for PRINT_OPERAND_PUNCT_VALID_P.  */
  memset (epiphany_punct_chars, 0, sizeof (epiphany_punct_chars));
  epiphany_punct_chars['-'] = 1;

  epiphany_normal_fp_rounding
    = (epiphany_normal_fp_mode == FP_MODE_ROUND_TRUNC
       ? FP_MODE_ROUND_TRUNC : FP_MODE_ROUND_NEAREST);
  register_pass (&mode_sw4_info);
  register_pass (&mode_sw2_info);
  register_pass (&mode_sw3_info);
  register_pass (&insert_use_info);
  register_pass (&mode_sw2_info);

#if 1 /* As long as peep2_rescan is not implemented,
         (see http://gcc.gnu.org/ml/gcc-patches/2011-10/msg02819.html,)
         we need a second peephole2 pass to get reasonable code.  */
  {
    static struct register_pass_info peep2_2_info
      = { &pass_peephole2.pass, "peephole2",
          1, PASS_POS_INSERT_AFTER
        };

    register_pass (&peep2_2_info);
  }
#endif
}

/* The condition codes of the EPIPHANY, and the inverse function.  */
static const char *const epiphany_condition_codes[] =
{ /* 0    1      2      3      4      5      6     7      8      9   */
   "eq", "ne", "ltu", "gteu", "gt", "lte", "gte", "lt", "gtu", "lteu",
  /* 10   11    12     13  */
   "beq","bne","blt", "blte",
};

#define EPIPHANY_INVERSE_CONDITION_CODE(X)  ((X) ^ 1)

/* Returns the index of the EPIPHANY condition code string in
   `epiphany_condition_codes'.  COMPARISON should be an rtx like
   `(eq (...) (...))'.  */

static int
get_epiphany_condition_code (rtx comparison)
{
  switch (GET_MODE (XEXP (comparison, 0)))
    {
    case CCmode:
      switch (GET_CODE (comparison))
        {
        case EQ  : return 0;
        case NE  : return 1;
        case LTU : return 2;
        case GEU : return 3;
        case GT  : return 4;
        case LE  : return 5;
        case GE  : return 6;
        case LT  : return 7;
        case GTU : return 8;
        case LEU : return 9;

        default : gcc_unreachable ();
        }
    case CC_N_NEmode:
      switch (GET_CODE (comparison))
        {
        case EQ: return 6;
        case NE: return 7;
        default: gcc_unreachable ();
        }
    case CC_C_LTUmode:
      switch (GET_CODE (comparison))
        {
        case GEU: return 2;
        case LTU: return 3;
        default: gcc_unreachable ();
        }
    case CC_C_GTUmode:
      switch (GET_CODE (comparison))
        {
        case LEU: return 3;
        case GTU: return 2;
        default: gcc_unreachable ();
        }
    case CC_FPmode:
      switch (GET_CODE (comparison))
        {
        case EQ: return 10;
        case NE: return 11;
        case LT: return 12;
        case LE: return 13;
        default: gcc_unreachable ();
        }
    case CC_FP_EQmode:
      switch (GET_CODE (comparison))
        {
        case EQ: return 0;
        case NE: return 1;
        default: gcc_unreachable ();
        }
    case CC_FP_GTEmode:
      switch (GET_CODE (comparison))
        {
        case EQ: return 0;
        case NE: return 1;
        case GT : return 4;
        case GE : return 6;
        case UNLE : return 5;
        case UNLT : return 7;
        default: gcc_unreachable ();
        }
    case CC_FP_ORDmode:
      switch (GET_CODE (comparison))
        {
        case ORDERED: return 9;
        case UNORDERED: return 8;
        default: gcc_unreachable ();
        }
    case CC_FP_UNEQmode:
      switch (GET_CODE (comparison))
        {
        case UNEQ: return 9;
        case LTGT: return 8;
        default: gcc_unreachable ();
        }
    default: gcc_unreachable ();
    }
  /*NOTREACHED*/
  return (42);
}


/* Return 1 if hard register REGNO can hold a value of machine_mode MODE.  */
int
hard_regno_mode_ok (int regno, enum machine_mode mode)
{
  if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)
    return (regno & 1) == 0 && GPR_P (regno);
  else
    return 1;
}

/* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE,
   return the mode to be used for the comparison.  */

enum machine_mode
epiphany_select_cc_mode (enum rtx_code op,
                         rtx x ATTRIBUTE_UNUSED,
                         rtx y ATTRIBUTE_UNUSED)
{
  if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT)
    {
      if (TARGET_SOFT_CMPSF)
        {
          if (op == EQ || op == NE)
            return CC_FP_EQmode;
          if (op == ORDERED || op == UNORDERED)
            return CC_FP_ORDmode;
          if (op == UNEQ || op == LTGT)
            return CC_FP_UNEQmode;
          return CC_FP_GTEmode;
        }
      return CC_FPmode;
    }
  /* recognize combiner pattern ashlsi_btst:
     (parallel [
            (set (reg:N_NE 65 cc1)
                (compare:N_NE (zero_extract:SI (reg/v:SI 75 [ a ])
                        (const_int 1 [0x1])
                        (const_int 0 [0x0]))
                    (const_int 0 [0x0])))
            (clobber (scratch:SI))  */
  else if ((op == EQ || op == NE)
           && GET_CODE (x) == ZERO_EXTRACT
           && XEXP (x, 1) == const1_rtx
           && CONST_INT_P (XEXP (x, 2)))
    return CC_N_NEmode;
  else if ((op == GEU || op == LTU) && GET_CODE (x) == PLUS)
    return CC_C_LTUmode;
  else if ((op == LEU || op == GTU) && GET_CODE (x) == MINUS)
    return CC_C_GTUmode;
  else
    return CCmode;
}

enum reg_class epiphany_regno_reg_class[FIRST_PSEUDO_REGISTER];

static void
epiphany_init_reg_tables (void)
{
  int i;

  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
    {
      if (i == GPR_LR)
        epiphany_regno_reg_class[i] = LR_REGS;
      else if (i <= 7 && TARGET_PREFER_SHORT_INSN_REGS)
        epiphany_regno_reg_class[i] = SHORT_INSN_REGS;
      else if (call_used_regs[i]
               && TEST_HARD_REG_BIT (reg_class_contents[GENERAL_REGS], i))
        epiphany_regno_reg_class[i] = SIBCALL_REGS;
      else if (i >= CORE_CONTROL_FIRST && i <= CORE_CONTROL_LAST)
        epiphany_regno_reg_class[i] = CORE_CONTROL_REGS;
      else if (i < (GPR_LAST+1)
               || i == ARG_POINTER_REGNUM || i == FRAME_POINTER_REGNUM)
        epiphany_regno_reg_class[i] = GENERAL_REGS;
      else if (i == CC_REGNUM)
        epiphany_regno_reg_class[i] = NO_REGS /* CC_REG: must be NO_REGS */;
      else
        epiphany_regno_reg_class[i] = NO_REGS;
    }
}
\f
/* EPIPHANY specific attribute support.

   The EPIPHANY has these attributes:
   interrupt - for interrupt functions.
   short_call - the function is assumed to be reachable with the b / bl
                instructions.
   long_call - the function address is loaded into a register before use.
   disinterrupt - functions which mask interrupts throughout.
                     They unmask them while calling an interruptible
                     function, though.  */

static const struct attribute_spec epiphany_attribute_table[] =
{
  /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
  { "interrupt",  0, 9, true,  false, false, epiphany_handle_interrupt_attribute, true },
  { "forwarder_section", 1, 1, true, false, false, epiphany_handle_forwarder_attribute, false },
  { "long_call",  0, 0, false, true, true, NULL, false },
  { "short_call", 0, 0, false, true, true, NULL, false },
  { "disinterrupt", 0, 0, false, true, true, NULL, true },
  { NULL,         0, 0, false, false, false, NULL, false }
};

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

  if (!args)
    return NULL_TREE;

  value = TREE_VALUE (args);

  if (TREE_CODE (value) != STRING_CST)
    {
      warning (OPT_Wattributes,
               "argument of %qE attribute is not a string constant", name);
      *no_add_attrs = true;
    }
  else if (strcmp (TREE_STRING_POINTER (value), "reset")
           && strcmp (TREE_STRING_POINTER (value), "software_exception")
           && strcmp (TREE_STRING_POINTER (value), "page_miss")
           && strcmp (TREE_STRING_POINTER (value), "timer0")
           && strcmp (TREE_STRING_POINTER (value), "timer1")
           && strcmp (TREE_STRING_POINTER (value), "message")
           && strcmp (TREE_STRING_POINTER (value), "dma0")
           && strcmp (TREE_STRING_POINTER (value), "dma1")
           && strcmp (TREE_STRING_POINTER (value), "wand")
           && strcmp (TREE_STRING_POINTER (value), "swi"))
    {
      warning (OPT_Wattributes,
               "argument of %qE attribute is not \"reset\", \"software_exception\", \"page_miss\", \"timer0\", \"timer1\", \"message\", \"dma0\", \"dma1\", \"wand\" or \"swi\"",
               name);
      *no_add_attrs = true;
      return NULL_TREE;
    }

  return epiphany_handle_interrupt_attribute (node, name, TREE_CHAIN (args),
                                              flags, no_add_attrs);
}

/* Handle a "forwarder_section" attribute; arguments as in
   struct attribute_spec.handler.  */
static tree
epiphany_handle_forwarder_attribute (tree *node ATTRIBUTE_UNUSED,
                                     tree name, tree args,
                                     int flags ATTRIBUTE_UNUSED,
                                     bool *no_add_attrs)
{
  tree value;

  value = TREE_VALUE (args);

  if (TREE_CODE (value) != STRING_CST)
    {
      warning (OPT_Wattributes,
               "argument of %qE attribute is not a string constant", name);
      *no_add_attrs = true;
    }
  return NULL_TREE;
}

\f
/* Misc. utilities.  */

/* Generate a SYMBOL_REF for the special function NAME.  When the address
   can't be placed directly into a call instruction, and if possible, copy
   it to a register so that cse / code hoisting is possible.  */
rtx
sfunc_symbol (const char *name)
{
  rtx sym = gen_rtx_SYMBOL_REF (Pmode, name);

  /* These sfuncs should be hidden, and every dso should get a copy.  */
  SYMBOL_REF_FLAGS (sym) = SYMBOL_FLAG_FUNCTION | SYMBOL_FLAG_LOCAL;
  if (TARGET_SHORT_CALLS)
    ; /* Nothing to be done.  */
  else if (can_create_pseudo_p ())
    sym = copy_to_mode_reg (Pmode, sym);
  else /* We rely on reload to fix this up.  */
    gcc_assert (!reload_in_progress || reload_completed);
  return sym;
}

/* X and Y are two things to compare using CODE in IN_MODE.
   Emit the compare insn, construct the the proper cc reg in the proper
   mode, and return the rtx for the cc reg comparison in CMODE.  */

rtx
gen_compare_reg (enum machine_mode cmode, enum rtx_code code,
                 enum machine_mode in_mode, rtx x, rtx y)
{
  enum machine_mode mode = SELECT_CC_MODE (code, x, y);
  rtx cc_reg, pat, clob0, clob1, clob2;

  if (in_mode == VOIDmode)
    in_mode = GET_MODE (x);
  if (in_mode == VOIDmode)
    in_mode = GET_MODE (y);

  if (mode == CC_FPmode)
    {
      /* The epiphany has only EQ / NE / LT / LE conditions for
         hardware floating point.  */
      if (code == GT || code == GE || code == UNLE || code == UNLT)
        {
          rtx tmp = x; x = y; y = tmp;
          code = swap_condition (code);
        }
      cc_reg = gen_rtx_REG (mode, CCFP_REGNUM);
      y = force_reg (in_mode, y);
    }
  else
    {
      if (mode == CC_FP_GTEmode
          && (code == LE || code == LT || code == UNGT || code == UNGE))
        {
          rtx tmp = x; x = y; y = tmp;
          code = swap_condition (code);
        }
      cc_reg = gen_rtx_REG (mode, CC_REGNUM);
    }
  if ((mode == CC_FP_EQmode || mode == CC_FP_GTEmode
       || mode == CC_FP_ORDmode || mode == CC_FP_UNEQmode)
      /* mov<mode>cc might want to re-emit a comparison during ifcvt.  */
      && (!REG_P (x) || REGNO (x) != 0 || !REG_P (y) || REGNO (y) != 1))
    {
      rtx reg;

      gcc_assert (currently_expanding_to_rtl);
      reg = gen_rtx_REG (in_mode, 0);
      gcc_assert (!reg_overlap_mentioned_p (reg, y));
      emit_move_insn (reg, x);
      x = reg;
      reg = gen_rtx_REG (in_mode, 1);
      emit_move_insn (reg, y);
      y = reg;
    }
  else
    x = force_reg (in_mode, x);

  pat = gen_rtx_SET (VOIDmode, cc_reg, gen_rtx_COMPARE (mode, x, y));
  if (mode == CC_FP_EQmode || mode == CC_FP_GTEmode)
    {
      const char *name = mode == CC_FP_EQmode ? "__eqsf2" : "__gtesf2";
      rtx use = gen_rtx_USE (VOIDmode, sfunc_symbol (name));

      clob0 = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, GPR_IP));
      clob1 = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, GPR_LR));
      pat = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (4, pat, use, clob0, clob1));
    }
  else if (mode == CC_FP_ORDmode || mode == CC_FP_UNEQmode)
    {
      const char *name = mode == CC_FP_ORDmode ? "__ordsf2" : "__uneqsf2";
      rtx use = gen_rtx_USE (VOIDmode, sfunc_symbol (name));

      clob0 = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, GPR_IP));
      clob1 = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, GPR_16));
      clob2 = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, GPR_LR));
      pat = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (5, pat, use,
                                                   clob0, clob1, clob2));
    }
  else
    {
      clob0 = gen_rtx_CLOBBER (VOIDmode, gen_rtx_SCRATCH (in_mode));
      pat = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, pat, clob0));
    }
  emit_insn (pat);
  return gen_rtx_fmt_ee (code, cmode, cc_reg, const0_rtx);
}
\f
/* The ROUND_ADVANCE* macros are local to this file.  */
/* Round SIZE up to a word boundary.  */
#define ROUND_ADVANCE(SIZE) \
  (((SIZE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

/* Round arg MODE/TYPE up to the next word boundary.  */
#define ROUND_ADVANCE_ARG(MODE, TYPE) \
  ((MODE) == BLKmode \
   ? ROUND_ADVANCE (int_size_in_bytes (TYPE)) \
   : ROUND_ADVANCE (GET_MODE_SIZE (MODE)))

/* Round CUM up to the necessary point for argument MODE/TYPE.  */
#define ROUND_ADVANCE_CUM(CUM, MODE, TYPE) \
  (epiphany_function_arg_boundary ((MODE), (TYPE)) > BITS_PER_WORD \
   ? (((CUM) + 1) & ~1) \
   : (CUM))

static unsigned int
epiphany_function_arg_boundary (enum machine_mode mode, const_tree type)
{
  if ((type ? TYPE_ALIGN (type) : GET_MODE_BITSIZE (mode)) <= PARM_BOUNDARY)
    return PARM_BOUNDARY;
  return 2 * PARM_BOUNDARY;
}

/* Do any needed setup for a variadic function.  For the EPIPHANY, we
   actually emit the code in epiphany_expand_prologue.

   CUM has not been updated for the last named argument which has type TYPE
   and mode MODE, and we rely on this fact.  */


static void
epiphany_setup_incoming_varargs (cumulative_args_t cum, enum machine_mode mode,
                                 tree type, int *pretend_size, int no_rtl)
{
  int first_anon_arg;
  CUMULATIVE_ARGS next_cum;
  machine_function_t *mf = MACHINE_FUNCTION (cfun);

  /* All BLKmode values are passed by reference.  */
  gcc_assert (mode != BLKmode);

  next_cum = *get_cumulative_args (cum);
  next_cum
    = ROUND_ADVANCE_CUM (next_cum, mode, type) + ROUND_ADVANCE_ARG (mode, type);
  first_anon_arg = next_cum;

  if (first_anon_arg < MAX_EPIPHANY_PARM_REGS && !no_rtl)
    {
      /* Note that first_reg_offset < MAX_EPIPHANY_PARM_REGS.  */
      int first_reg_offset = first_anon_arg;

      *pretend_size = ((MAX_EPIPHANY_PARM_REGS - first_reg_offset)
                       * UNITS_PER_WORD);
    }
  mf->args_parsed = 1;
  mf->pretend_args_odd = ((*pretend_size & UNITS_PER_WORD) ? 1 : 0);
}

static int
epiphany_arg_partial_bytes (cumulative_args_t cum, enum machine_mode mode,
                            tree type, bool named ATTRIBUTE_UNUSED)
{
  int words = 0, rounded_cum;

  gcc_assert (!epiphany_pass_by_reference (cum, mode, type, /* named */ true));

  rounded_cum = ROUND_ADVANCE_CUM (*get_cumulative_args (cum), mode, type);
  if (rounded_cum < MAX_EPIPHANY_PARM_REGS)
    {
      words = MAX_EPIPHANY_PARM_REGS - rounded_cum;
      if (words >= ROUND_ADVANCE_ARG (mode, type))
        words = 0;
    }
  return words * UNITS_PER_WORD;
}
\f
/* Cost functions.  */

/* Compute a (partial) cost for rtx X.  Return true if the complete
   cost has been computed, and false if subexpressions should be
   scanned.  In either case, *TOTAL contains the cost result.  */

static bool
epiphany_rtx_costs (rtx x, int code, int outer_code, int opno ATTRIBUTE_UNUSED,
                    int *total, bool speed ATTRIBUTE_UNUSED)
{
  switch (code)
    {
      /* Small integers in the right context are as cheap as registers.  */
    case CONST_INT:
      if ((outer_code == PLUS || outer_code == MINUS)
          && SIMM11 (INTVAL (x)))
        {
          *total = 0;
          return true;
        }
      if (IMM16 (INTVAL (x)))
        {
          *total = outer_code == SET ? 0 : COSTS_N_INSNS (1);
          return true;
        }
      /* FALLTHRU */

    case CONST:
    case LABEL_REF:
    case SYMBOL_REF:
      *total = COSTS_N_INSNS ((epiphany_small16 (x) ? 0 : 1)
                              + (outer_code == SET ? 0 : 1));
      return true;

    case CONST_DOUBLE:
      {
        rtx high, low;
        split_double (x, &high, &low);
        *total = COSTS_N_INSNS (!IMM16 (INTVAL (high))
                                + !IMM16 (INTVAL (low)));
        return true;
      }

    case ASHIFT:
    case ASHIFTRT:
    case LSHIFTRT:
      *total = COSTS_N_INSNS (1);
      return true;

    default:
      return false;
    }
}


/* Provide the costs of an addressing mode that contains ADDR.
   If ADDR is not a valid address, its cost is irrelevant.  */

static int
epiphany_address_cost (rtx addr, enum machine_mode mode,
                       addr_space_t as ATTRIBUTE_UNUSED, bool speed)
{
  rtx reg;
  rtx off = const0_rtx;
  int i;

  if (speed)
    return 0;
  /* Return 0 for addresses valid in short insns, 1 for addresses only valid
     in long insns.  */
  switch (GET_CODE (addr))
    {
    case PLUS :
      reg = XEXP (addr, 0);
      off = XEXP (addr, 1);
      break;
    case POST_MODIFY:
      reg = XEXP (addr, 0);
      off = XEXP (addr, 1);
      gcc_assert (GET_CODE (off) == PLUS && rtx_equal_p (reg, XEXP (off, 0)));
      off = XEXP (off, 1);
      if (satisfies_constraint_Rgs (reg) && satisfies_constraint_Rgs (off))
        return 0;
      return 1;
    case REG:
    default:
      reg = addr;
      break;
    }
  if (!satisfies_constraint_Rgs (reg))
    return 1;
  /* The offset range available for short instructions depends on the mode
     of the memory access.  */
  /* First, make sure we have a valid integer.  */
  if (!satisfies_constraint_L (off))
    return 1;
  i = INTVAL (off);
  switch (GET_MODE_SIZE (mode))
    {
      default:
      case 4:
        if (i & 1)
          return 1;
        i >>= 1;
        /* Fall through.  */
      case 2:
        if (i & 1)
          return 1;
        i >>= 1;
        /* Fall through.  */
      case 1:
        return i < -7 || i > 7;
    }
}

/* Compute the cost of moving data between registers and memory.
   For integer, load latency is twice as long as register-register moves,
   but issue pich is the same.  For floating point, load latency is three
   times as much as a reg-reg move.  */
static int
epiphany_memory_move_cost (enum machine_mode mode,
                          reg_class_t rclass ATTRIBUTE_UNUSED,
                          bool in ATTRIBUTE_UNUSED)
{
  return GET_MODE_CLASS (mode) == MODE_INT ? 3 : 4;
}
\f
/* Function prologue/epilogue handlers.  */

/* EPIPHANY stack frames look like:

             Before call                       After call
        +-----------------------+       +-----------------------+
        |                       |       |                       |
   high |  local variables,     |       |  local variables,     |
   mem  |  reg save area, etc.  |       |  reg save area, etc.  |
        |                       |       |                       |
        +-----------------------+       +-----------------------+
        |                       |       |                       |
        |  arguments on stack.  |       |  arguments on stack.  |
        |                       |       |                       |
  SP+8->+-----------------------+FP+8m->+-----------------------+
        | 2 word save area for  |       |  reg parm save area,  |
        | leaf funcs / flags    |       |  only created for     |
  SP+0->+-----------------------+       |  variable argument    |
                                        |  functions            |
                                 FP+8n->+-----------------------+
                                        |                       |
                                        |  register save area   |
                                        |                       |
                                        +-----------------------+
                                        |                       |
                                        |  local variables      |
                                        |                       |
                                  FP+0->+-----------------------+
                                        |                       |
                                        |  alloca allocations   |
                                        |                       |
                                        +-----------------------+
                                        |                       |
                                        |  arguments on stack   |
                                        |                       |
                                  SP+8->+-----------------------+
   low                                  | 2 word save area for  |
   memory                               | leaf funcs / flags    |
                                  SP+0->+-----------------------+

Notes:
1) The "reg parm save area" does not exist for non variable argument fns.
   The "reg parm save area" could be eliminated if we created our
   own TARGET_GIMPLIFY_VA_ARG_EXPR, but that has tradeoffs as well
   (so it's not done).  */

/* Structure to be filled in by epiphany_compute_frame_size with register
   save masks, and offsets for the current function.  */
struct epiphany_frame_info
{
  unsigned int total_size;      /* # bytes that the entire frame takes up.  */
  unsigned int pretend_size;    /* # bytes we push and pretend caller did.  */
  unsigned int args_size;       /* # bytes that outgoing arguments take up.  */
  unsigned int reg_size;        /* # bytes needed to store regs.  */
  unsigned int var_size;        /* # bytes that variables take up.  */
  HARD_REG_SET gmask;           /* Set of saved gp registers.  */
  int          initialized;     /* Nonzero if frame size already calculated.  */
  int      stld_sz;             /* Current load/store data size for offset
                                   adjustment. */
  int      need_fp;             /* value to override "frame_pointer_needed */
  int first_slot, last_slot, first_slot_offset, last_slot_offset;
  int first_slot_size;
  int small_threshold;
};

/* Current frame information calculated by epiphany_compute_frame_size.  */
static struct epiphany_frame_info current_frame_info;

/* Zero structure to initialize current_frame_info.  */
static struct epiphany_frame_info zero_frame_info;

/* The usual; we set up our machine_function data.  */
static struct machine_function *
epiphany_init_machine_status (void)
{
  struct machine_function *machine;

  /* Reset state info for each function.  */
  current_frame_info = zero_frame_info;

  machine = ggc_alloc_cleared_machine_function_t ();

  return machine;
}

/* Implements INIT_EXPANDERS.  We just set up to call the above
 *    function.  */
void
epiphany_init_expanders (void)
{
  init_machine_status = epiphany_init_machine_status;
}

/* Type of function DECL.

   The result is cached.  To reset the cache at the end of a function,
   call with DECL = NULL_TREE.  */

static enum epiphany_function_type
epiphany_compute_function_type (tree decl)
{
  tree a;
  /* Cached value.  */
  static enum epiphany_function_type fn_type = EPIPHANY_FUNCTION_UNKNOWN;
  /* Last function we were called for.  */
  static tree last_fn = NULL_TREE;

  /* Resetting the cached value?  */
  if (decl == NULL_TREE)
    {
      fn_type = EPIPHANY_FUNCTION_UNKNOWN;
      last_fn = NULL_TREE;
      return fn_type;
    }

  if (decl == last_fn && fn_type != EPIPHANY_FUNCTION_UNKNOWN)
    return fn_type;

  /* Assume we have a normal function (not an interrupt handler).  */
  fn_type = EPIPHANY_FUNCTION_NORMAL;

  /* Now see if this is an interrupt handler.  */
  for (a = DECL_ATTRIBUTES (decl);
       a;
       a = TREE_CHAIN (a))
    {
      tree name = TREE_PURPOSE (a);

      if (name == get_identifier ("interrupt"))
        fn_type = EPIPHANY_FUNCTION_INTERRUPT;
    }

  last_fn = decl;
  return fn_type;
}

#define RETURN_ADDR_REGNUM GPR_LR
#define FRAME_POINTER_MASK (1 << (FRAME_POINTER_REGNUM))
#define RETURN_ADDR_MASK (1 << (RETURN_ADDR_REGNUM))

/* Tell prologue and epilogue if register REGNO should be saved / restored.
   The return address and frame pointer are treated separately.
   Don't consider them here.  */
#define MUST_SAVE_REGISTER(regno, interrupt_p) \
  ((df_regs_ever_live_p (regno) \
    || (interrupt_p && !crtl->is_leaf \
        && call_used_regs[regno] && !fixed_regs[regno])) \
   && (!call_used_regs[regno] || regno == GPR_LR \
       || (interrupt_p && regno != GPR_SP)))

#define MUST_SAVE_RETURN_ADDR 0

/* Return the bytes needed to compute the frame pointer from the current
   stack pointer.

   SIZE is the size needed for local variables.  */

static unsigned int
epiphany_compute_frame_size (int size /* # of var. bytes allocated.  */)
{
  int regno;
  unsigned int total_size, var_size, args_size, pretend_size, reg_size;
  HARD_REG_SET gmask;
  enum epiphany_function_type fn_type;
  int interrupt_p;
  int first_slot, last_slot, first_slot_offset, last_slot_offset;
  int first_slot_size;
  int small_slots = 0;
  long lr_slot_offset;

  var_size      = size;
  args_size     = crtl->outgoing_args_size;
  pretend_size  = crtl->args.pretend_args_size;
  total_size    = args_size + var_size;
  reg_size      = 0;
  CLEAR_HARD_REG_SET (gmask);
  first_slot = -1;
  first_slot_offset = 0;
  last_slot = -1;
  last_slot_offset = 0;
  first_slot_size = UNITS_PER_WORD;

  /* See if this is an interrupt handler.  Call used registers must be saved
     for them too.  */
  fn_type = epiphany_compute_function_type (current_function_decl);
  interrupt_p = EPIPHANY_INTERRUPT_P (fn_type);

  /* Calculate space needed for registers.  */

  for (regno = MAX_EPIPHANY_PARM_REGS - 1; pretend_size > reg_size; regno--)
    {
      reg_size += UNITS_PER_WORD;
      SET_HARD_REG_BIT (gmask, regno);
      if (epiphany_stack_offset - reg_size == 0)
        first_slot = regno;
    }

  if (interrupt_p)
    reg_size += 2 * UNITS_PER_WORD;
  else
    small_slots = epiphany_stack_offset / UNITS_PER_WORD;

  if (frame_pointer_needed)
    {
      current_frame_info.need_fp = 1;
      if (!interrupt_p && first_slot < 0)
        first_slot = GPR_FP;
    }
  else
    current_frame_info.need_fp = 0;
  for (regno = 0; regno <= GPR_LAST; regno++)
    {
      if (MUST_SAVE_REGISTER (regno, interrupt_p))
        {
          gcc_assert (!TEST_HARD_REG_BIT (gmask, regno));
          reg_size += UNITS_PER_WORD;
          SET_HARD_REG_BIT (gmask, regno);
          /* FIXME: when optimizing for speed, take schedling into account
             when selecting these registers.  */
          if (regno == first_slot)
            gcc_assert (regno == GPR_FP && frame_pointer_needed);
          else if (!interrupt_p && first_slot < 0)
            first_slot = regno;
          else if (last_slot < 0
                   && (first_slot ^ regno) != 1
                   && (!interrupt_p || regno > GPR_0 + 1))
            last_slot = regno;
        }
    }
  if (TEST_HARD_REG_BIT (gmask, GPR_LR))
    MACHINE_FUNCTION (cfun)->lr_clobbered = 1;
  /* ??? Could sometimes do better than that.  */
  current_frame_info.small_threshold
    = (optimize >= 3 || interrupt_p ? 0
       : pretend_size ? small_slots
       : 4 + small_slots - (first_slot == GPR_FP));

  /* If there might be variables with 64-bit alignment requirement, align the
     start of the variables.  */
  if (var_size >= 2 * UNITS_PER_WORD
      /* We don't want to split a double reg save/restore across two unpaired
         stack slots when optimizing.  This rounding could be avoided with
         more complex reordering of the register saves, but that would seem
         to be a lot of code complexity for little gain.  */
      || (reg_size > 8 && optimize))
    reg_size = EPIPHANY_STACK_ALIGN (reg_size);
  if (total_size + reg_size <= (unsigned) epiphany_stack_offset
      && !interrupt_p
      && crtl->is_leaf && !frame_pointer_needed)
    {
      first_slot = -1;
      last_slot = -1;
      goto alloc_done;
    }
  else if (reg_size
           && !interrupt_p
           && reg_size < (unsigned HOST_WIDE_INT) epiphany_stack_offset)
    reg_size = epiphany_stack_offset;
  if (interrupt_p)
    {
      if (total_size + reg_size < 0x3fc)
        {
          first_slot_offset = EPIPHANY_STACK_ALIGN (total_size + reg_size);
          first_slot_offset += EPIPHANY_STACK_ALIGN (epiphany_stack_offset);
          last_slot = -1;
        }
      else
        {
          first_slot_offset = EPIPHANY_STACK_ALIGN (reg_size);
          last_slot_offset = EPIPHANY_STACK_ALIGN (total_size);
          last_slot_offset += EPIPHANY_STACK_ALIGN (epiphany_stack_offset);
          if (last_slot >= 0)
            CLEAR_HARD_REG_BIT (gmask, last_slot);
        }
    }
  else if (total_size + reg_size < 0x1ffc && first_slot >= 0)
    {
      first_slot_offset = EPIPHANY_STACK_ALIGN (total_size + reg_size);
      last_slot = -1;
    }
  else
    {
      if (total_size + reg_size <= (unsigned) epiphany_stack_offset)
        {
          gcc_assert (first_slot < 0);
          gcc_assert (reg_size == 0);
          last_slot_offset = EPIPHANY_STACK_ALIGN (total_size + reg_size);
        }
      else
        {
          first_slot_offset
            = (reg_size
               ? EPIPHANY_STACK_ALIGN (reg_size - epiphany_stack_offset) : 0);
          if (!first_slot_offset)
            {
              if (first_slot != GPR_FP || !current_frame_info.need_fp)
                last_slot = first_slot;
              first_slot = -1;
            }
          last_slot_offset = EPIPHANY_STACK_ALIGN (total_size);
          if (reg_size)
            last_slot_offset += EPIPHANY_STACK_ALIGN (epiphany_stack_offset);
        }
      if (last_slot >= 0)
        CLEAR_HARD_REG_BIT (gmask, last_slot);
    }
 alloc_done:
  if (first_slot >= 0)
    {
      CLEAR_HARD_REG_BIT (gmask, first_slot);
      if (TEST_HARD_REG_BIT (gmask, first_slot ^ 1)
          && epiphany_stack_offset - pretend_size >= 2 * UNITS_PER_WORD)
        {
          CLEAR_HARD_REG_BIT (gmask, first_slot ^ 1);
          first_slot_size = 2 * UNITS_PER_WORD;
          first_slot &= ~1;
        }
    }
  total_size = first_slot_offset + last_slot_offset;

  lr_slot_offset
    = (frame_pointer_needed ? first_slot_offset : (long) total_size);
  if (first_slot != GPR_LR)
    {
      int stack_offset = epiphany_stack_offset - UNITS_PER_WORD;

      for (regno = 0; ; regno++)
        {
          if (stack_offset + UNITS_PER_WORD - first_slot_size == 0
              && first_slot >= 0)
            {
              stack_offset -= first_slot_size;
              regno--;
            }
          else if (regno == GPR_LR)
            break;
          else if TEST_HARD_REG_BIT (gmask, regno)
            stack_offset -= UNITS_PER_WORD;
        }
      lr_slot_offset += stack_offset;
    }

  /* Save computed information.  */
  current_frame_info.total_size   = total_size;
  current_frame_info.pretend_size = pretend_size;
  current_frame_info.var_size     = var_size;
  current_frame_info.args_size    = args_size;
  current_frame_info.reg_size     = reg_size;
  COPY_HARD_REG_SET (current_frame_info.gmask, gmask);
  current_frame_info.first_slot         = first_slot;
  current_frame_info.last_slot          = last_slot;
  current_frame_info.first_slot_offset  = first_slot_offset;
  current_frame_info.first_slot_size    = first_slot_size;
  current_frame_info.last_slot_offset   = last_slot_offset;
  MACHINE_FUNCTION (cfun)->lr_slot_offset = lr_slot_offset;

  current_frame_info.initialized  = reload_completed;

  /* Ok, we're done.  */
  return total_size;
}
\f
/* Print operand X (an rtx) in assembler syntax to file FILE.
   CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
   For `%' followed by punctuation, CODE is the punctuation and X is null.  */

static void
epiphany_print_operand (FILE *file, rtx x, int code)
{
  switch (code)
    {
    case 'd':
      fputs (epiphany_condition_codes[get_epiphany_condition_code (x)], file);
      return;
    case 'D':
     fputs (epiphany_condition_codes[EPIPHANY_INVERSE_CONDITION_CODE
                                 (get_epiphany_condition_code (x))],
             file);
      return;

    case 'X':
      current_frame_info.stld_sz = 8;
      break;

    case 'C' :
      current_frame_info.stld_sz = 4;
      break;

    case 'c' :
      current_frame_info.stld_sz = 2;
      break;

    case 'f':
     fputs (REG_P (x) ? "jalr " : "bl ", file);
     break;

    case '-':
    fprintf (file, "r%d", epiphany_m1reg);
    return;

    case 0 :
      /* Do nothing special.  */
      break;
    default :
      /* Unknown flag.  */
      output_operand_lossage ("invalid operand output code");
    }

  switch (GET_CODE (x))
    {
      rtx addr;
      rtx offset;

    case REG :
      fputs (reg_names[REGNO (x)], file);
      break;
    case MEM :
      if (code == 0)
        current_frame_info.stld_sz = 1;
      fputc ('[', file);
      addr = XEXP (x, 0);
      switch (GET_CODE (addr))
        {
          case POST_INC:
            offset = GEN_INT (GET_MODE_SIZE (GET_MODE (x)));
            addr = XEXP (addr, 0);
            break;
          case POST_DEC:
            offset = GEN_INT (-GET_MODE_SIZE (GET_MODE (x)));
            addr = XEXP (addr, 0);
            break;
          case POST_MODIFY:
            offset = XEXP (XEXP (addr, 1), 1);
            addr = XEXP (addr, 0);
            break;
          default:
            offset = 0;
            break;
        }
      output_address (addr);
      fputc (']', file);
      if (offset)
        {
          fputc (',', file);
          if (CONST_INT_P (offset)) switch (GET_MODE_SIZE (GET_MODE (x)))
            {
              default:
                gcc_unreachable ();
              case 8:
                offset = GEN_INT (INTVAL (offset) >> 3);
                break;
              case 4:
                offset = GEN_INT (INTVAL (offset) >> 2);
                break;
              case 2:
                offset = GEN_INT (INTVAL (offset) >> 1);
                break;
              case 1:
                break;
            }
          output_address (offset);
        }
      break;
    case CONST_DOUBLE :
      /* We handle SFmode constants here as output_addr_const doesn't.  */
      if (GET_MODE (x) == SFmode)
        {
          REAL_VALUE_TYPE d;
          long l;

          REAL_VALUE_FROM_CONST_DOUBLE (d, x);
          REAL_VALUE_TO_TARGET_SINGLE (d, l);
          fprintf (file, "%s0x%08lx", IMMEDIATE_PREFIX, l);
          break;
        }
      /* Fall through.  Let output_addr_const deal with it.  */
    case CONST_INT:
      fprintf(file,"%s",IMMEDIATE_PREFIX);
      if (code == 'C' || code == 'X')
        {
          fprintf (file, "%ld",
                   (long) (INTVAL (x) / current_frame_info.stld_sz));
          break;
        }
      /* Fall through */
    default :
      output_addr_const (file, x);
      break;
    }
}

/* Print a memory address as an operand to reference that memory location.  */

static void
epiphany_print_operand_address (FILE *file, rtx addr)
{
  register rtx base, index = 0;
  int offset = 0;

  switch (GET_CODE (addr))
    {
    case REG :
      fputs (reg_names[REGNO (addr)], file);
      break;
    case SYMBOL_REF :
      if (/*???*/ 0 && SYMBOL_REF_FUNCTION_P (addr))
        {
          output_addr_const (file, addr);
        }
      else
        {
          output_addr_const (file, addr);
        }
      break;
    case PLUS :
      if (GET_CODE (XEXP (addr, 0)) == CONST_INT)
        offset = INTVAL (XEXP (addr, 0)), base = XEXP (addr, 1);
      else if (GET_CODE (XEXP (addr, 1)) == CONST_INT)
        offset = INTVAL (XEXP (addr, 1)), base = XEXP (addr, 0);
      else
        base = XEXP (addr, 0), index = XEXP (addr, 1);
      gcc_assert (GET_CODE (base) == REG);
      fputs (reg_names[REGNO (base)], file);
      if (index == 0)
        {
          /*
          ** ++rk quirky method to scale offset for ld/str.......
          */
          fprintf (file, ",%s%d", IMMEDIATE_PREFIX,
                   offset/current_frame_info.stld_sz);
        }
      else
        {
          switch (GET_CODE (index))
            {
            case REG:
              fprintf (file, ",%s", reg_names[REGNO (index)]);
              break;
            case SYMBOL_REF:
              fputc (',', file), output_addr_const (file, index);
              break;
            default:
              gcc_unreachable ();
            }
        }
      break;
    case PRE_INC: case PRE_DEC: case POST_INC: case POST_DEC: case POST_MODIFY:
      /* We shouldn't get here as we've lost the mode of the memory object
         (which says how much to inc/dec by.  */
      gcc_unreachable ();
      break;
    default:
      output_addr_const (file, addr);
      break;
    }
}

void
epiphany_final_prescan_insn (rtx insn ATTRIBUTE_UNUSED,
                             rtx *opvec ATTRIBUTE_UNUSED,
                             int noperands ATTRIBUTE_UNUSED)
{
  int i = epiphany_n_nops;
  rtx pat ATTRIBUTE_UNUSED;

  while (i--)
    fputs ("\tnop\n", asm_out_file);
}

\f
/* Worker function for TARGET_RETURN_IN_MEMORY.  */

static bool
epiphany_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED)
{
  HOST_WIDE_INT size = int_size_in_bytes (type);

  if (AGGREGATE_TYPE_P (type)
      && (TYPE_MODE (type) == BLKmode || TYPE_NEEDS_CONSTRUCTING (type)))
    return true;
  return (size == -1 || size > 8);
}

/* For EPIPHANY, All aggregates and arguments greater than 8 bytes are
   passed by reference.  */

static bool
epiphany_pass_by_reference (cumulative_args_t ca ATTRIBUTE_UNUSED,
                       enum machine_mode mode, const_tree type,
                       bool named ATTRIBUTE_UNUSED)
{
  if (type)
    {
      if (AGGREGATE_TYPE_P (type)
          && (mode == BLKmode || TYPE_NEEDS_CONSTRUCTING (type)))
        return true;
    }
  return false;
}


static rtx
epiphany_function_value (const_tree ret_type,
                         const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
                         bool outgoing ATTRIBUTE_UNUSED)
{
  enum machine_mode mode;

  mode = TYPE_MODE (ret_type);
  /* We must change the mode like PROMOTE_MODE does.
     ??? PROMOTE_MODE is ignored for non-scalar types.
     The set of types tested here has to be kept in sync
     with the one in explow.c:promote_mode.  */
  if (GET_MODE_CLASS (mode) == MODE_INT
      && GET_MODE_SIZE (mode) < 4
      && (TREE_CODE (ret_type) == INTEGER_TYPE
          || TREE_CODE (ret_type) == ENUMERAL_TYPE
          || TREE_CODE (ret_type) == BOOLEAN_TYPE
          || TREE_CODE (ret_type) == OFFSET_TYPE))
    mode = SImode;
  return gen_rtx_REG (mode, 0);
}

static rtx
epiphany_libcall_value (enum machine_mode mode, const_rtx fun ATTRIBUTE_UNUSED)
{
  return gen_rtx_REG (mode, 0);
}

static bool
epiphany_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
{
  return regno == 0;
}

/* Fix up invalid option settings.  */
static void
epiphany_override_options (void)
{
  if (epiphany_stack_offset < 4)
    error ("stack_offset must be at least 4");
  if (epiphany_stack_offset & 3)
    error ("stack_offset must be a multiple of 4");
  epiphany_stack_offset = (epiphany_stack_offset + 3) & -4;

  /* This needs to be done at start up.  It's convenient to do it here.  */
  epiphany_init ();
}

/* For a DImode load / store SET, make a SImode set for a
   REG_FRAME_RELATED_EXPR note, using OFFSET to create a high or lowpart
   subreg.  */
static rtx
frame_subreg_note (rtx set, int offset)
{
  rtx src = simplify_gen_subreg (SImode, SET_SRC (set), DImode, offset);
  rtx dst = simplify_gen_subreg (SImode, SET_DEST (set), DImode, offset);

  set = gen_rtx_SET (VOIDmode, dst ,src);
  RTX_FRAME_RELATED_P (set) = 1;
  return set;
}

static rtx
frame_insn (rtx x)
{
  int i;
  rtx note = NULL_RTX;

  if (GET_CODE (x) == PARALLEL)
    {
      rtx part = XVECEXP (x, 0, 0);

      if (GET_MODE (SET_DEST (part)) == DImode)
        {
          note = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (XVECLEN (x, 0) + 1));
          XVECEXP (note, 0, 0) = frame_subreg_note (part, 0);
          XVECEXP (note, 0, 1) = frame_subreg_note (part, UNITS_PER_WORD);
          for (i = XVECLEN (x, 0) - 1; i >= 1; i--)
            {
              part = copy_rtx (XVECEXP (x, 0, i));

              if (GET_CODE (part) == SET)
                RTX_FRAME_RELATED_P (part) = 1;
              XVECEXP (note, 0, i + 1) = part;
            }
        }
      else
        {
          for (i = XVECLEN (x, 0) - 1; i >= 0; i--)
            {
              part = XVECEXP (x, 0, i);

              if (GET_CODE (part) == SET)
                RTX_FRAME_RELATED_P (part) = 1;
            }
        }
    }
  else if (GET_CODE (x) == SET && GET_MODE (SET_DEST (x)) == DImode)
    note = gen_rtx_PARALLEL (VOIDmode,
                             gen_rtvec (2, frame_subreg_note (x, 0),
                                        frame_subreg_note (x, UNITS_PER_WORD)));
  x = emit_insn (x);
  RTX_FRAME_RELATED_P (x) = 1;
  if (note)
    add_reg_note (x, REG_FRAME_RELATED_EXPR, note);
  return x;
}

static rtx
frame_move_insn (rtx to, rtx from)
{
  return frame_insn (gen_rtx_SET (VOIDmode, to, from));
}

/* Generate a MEM referring to a varargs argument slot.  */

static rtx
gen_varargs_mem (enum machine_mode mode, rtx addr)
{
  rtx mem = gen_rtx_MEM (mode, addr);
  MEM_NOTRAP_P (mem) = 1;
  set_mem_alias_set (mem, get_varargs_alias_set ());
  return mem;
}

/* Emit instructions to save or restore registers in the range [MIN..LIMIT) .
   If EPILOGUE_P is 0, save; if it is one, restore.
   ADDR is the stack slot to save the first register to; subsequent
   registers are written to lower addresses.
   However, the order of register pairs can be reversed in order to
   use double-word load-store instructions.  Likewise, an unpaired single
   word save slot can be skipped while double saves are carried out, and
   reused when a single register is to be saved.  */

static void
epiphany_emit_save_restore (int min, int limit, rtx addr, int epilogue_p)
{
  int i;
  int stack_offset
    = current_frame_info.first_slot >= 0 ? epiphany_stack_offset : 0;
  rtx skipped_mem = NULL_RTX;
  int last_saved = limit - 1;

  if (!optimize)
    while (last_saved >= 0
           && !TEST_HARD_REG_BIT (current_frame_info.gmask, last_saved))
      last_saved--;
  for (i = 0; i < limit; i++)
    {
      enum machine_mode mode = word_mode;
      rtx mem, reg;
      int n = i;
      rtx (*gen_mem) (enum machine_mode, rtx) = gen_frame_mem;

      /* Make sure we push the arguments in the right order.  */
      if (n < MAX_EPIPHANY_PARM_REGS && crtl->args.pretend_args_size)
        {
          n = MAX_EPIPHANY_PARM_REGS - 1 - n;
          gen_mem = gen_varargs_mem;
        }
      if (stack_offset == current_frame_info.first_slot_size
          && current_frame_info.first_slot >= 0)
        {
          if (current_frame_info.first_slot_size > UNITS_PER_WORD)
            {
              mode = DImode;
              addr = plus_constant (Pmode, addr,
                                    - (HOST_WIDE_INT) UNITS_PER_WORD);
            }
          if (i-- < min || !epilogue_p)
            goto next_slot;
          n = current_frame_info.first_slot;
          gen_mem = gen_frame_mem;
        }
      else if (n == UNKNOWN_REGNUM
               && stack_offset > current_frame_info.first_slot_size)
        {
          i--;
          goto next_slot;
        }
      else if (!TEST_HARD_REG_BIT (current_frame_info.gmask, n))
        continue;
      else if (i < min)
        goto next_slot;

      /* Check for a register pair to save.  */
      if (n == i
          && (n >= MAX_EPIPHANY_PARM_REGS || crtl->args.pretend_args_size == 0)
          && (n & 1) == 0 && n+1 < limit
          && TEST_HARD_REG_BIT (current_frame_info.gmask, n+1))
        {
          /* If it fits in the current stack slot pair, place it there.  */
          if (GET_CODE (addr) == PLUS && (stack_offset & 7) == 0
              && stack_offset != 2 * UNITS_PER_WORD
              && (current_frame_info.last_slot < 0
                  || INTVAL (XEXP (addr, 1)) != UNITS_PER_WORD)
              && (n+1 != last_saved || !skipped_mem))
            {
              mode = DImode;
              i++;
              addr = plus_constant (Pmode, addr,
                                    - (HOST_WIDE_INT) UNITS_PER_WORD);
            }
          /* If it fits in the following stack slot pair, that's fine, too.  */
          else if (GET_CODE (addr) == PLUS && (stack_offset & 7) == 4
                   && stack_offset != 2 * UNITS_PER_WORD
                   && stack_offset != 3 * UNITS_PER_WORD
                   && (current_frame_info.last_slot < 0
                       || INTVAL (XEXP (addr, 1)) != 2 * UNITS_PER_WORD)
                   && n + 1 != last_saved)
            {
              gcc_assert (!skipped_mem);
              stack_offset -= GET_MODE_SIZE (mode);
              skipped_mem = gen_mem (mode, addr);
              mode = DImode;
              i++;
              addr = plus_constant (Pmode, addr,
                                    - (HOST_WIDE_INT) 2 * UNITS_PER_WORD);
            }
        }
      reg = gen_rtx_REG (mode, n);
      if (mode != DImode && skipped_mem)
        mem = skipped_mem;
      else
        mem = gen_mem (mode, addr);
      if (!epilogue_p)
        frame_move_insn (mem, reg);
      else if (n >= MAX_EPIPHANY_PARM_REGS || !crtl->args.pretend_args_size)
        emit_move_insn (reg, mem);
      if (mem == skipped_mem)
        {
          skipped_mem = NULL_RTX;
          continue;
        }
    next_slot:
      addr = plus_constant (Pmode, addr, -(HOST_WIDE_INT) UNITS_PER_WORD);
      stack_offset -= GET_MODE_SIZE (mode);
    }
}

void
epiphany_expand_prologue (void)
{
  int interrupt_p;
  enum epiphany_function_type fn_type;
  rtx addr, mem, off, reg;
  rtx save_config;

  if (!current_frame_info.initialized)
    epiphany_compute_frame_size (get_frame_size ());

  /* It is debatable if we should adjust this by epiphany_stack_offset.  */
  if (flag_stack_usage_info)
    current_function_static_stack_size = current_frame_info.total_size;

  fn_type = epiphany_compute_function_type (current_function_decl);
  interrupt_p = EPIPHANY_INTERRUPT_P (fn_type);

  if (interrupt_p)
    {
      addr = plus_constant (Pmode, stack_pointer_rtx,
                            - (HOST_WIDE_INT) 2 * UNITS_PER_WORD);
      if (!lookup_attribute ("forwarder_section",
                            DECL_ATTRIBUTES (current_function_decl))
          || !epiphany_is_long_call_p (XEXP (DECL_RTL (current_function_decl),
                                             0)))
        frame_move_insn (gen_frame_mem (DImode, addr),
                         gen_rtx_REG (DImode, GPR_0));
      frame_move_insn (gen_rtx_REG (SImode, GPR_0),
                       gen_rtx_REG (word_mode, STATUS_REGNUM));
      frame_move_insn (gen_rtx_REG (SImode, GPR_0+1),
                       gen_rtx_REG (word_mode, IRET_REGNUM));
      mem = gen_frame_mem (BLKmode, stack_pointer_rtx);
      off = GEN_INT (-current_frame_info.first_slot_offset);
      frame_insn (gen_stack_adjust_add (off, mem));
      if (!epiphany_uninterruptible_p (current_function_decl))
        emit_insn (gen_gie ());
      addr = plus_constant (Pmode, stack_pointer_rtx,
                            current_frame_info.first_slot_offset
                            - (HOST_WIDE_INT) 3 * UNITS_PER_WORD);
    }
  else
    {
      addr = plus_constant (Pmode, stack_pointer_rtx,
                            epiphany_stack_offset
                            - (HOST_WIDE_INT) UNITS_PER_WORD);
      epiphany_emit_save_restore (0, current_frame_info.small_threshold,
                                  addr, 0);
      /* Allocate register save area; for small to medium size frames,
         allocate the entire frame; this is joint with one register save.  */
      if (current_frame_info.first_slot >= 0)
        {
          enum machine_mode mode
        = (current_frame_info.first_slot_size == UNITS_PER_WORD
           ? word_mode : DImode);

          off = GEN_INT (-current_frame_info.first_slot_offset);
          mem = gen_frame_mem (BLKmode,
                               gen_rtx_PLUS (Pmode, stack_pointer_rtx, off));
          frame_insn (gen_stack_adjust_str
                       (gen_frame_mem (mode, stack_pointer_rtx),
                        gen_rtx_REG (mode, current_frame_info.first_slot),
                        off, mem));
          addr = plus_constant (Pmode, addr,
                                current_frame_info.first_slot_offset);
        }
    }
  epiphany_emit_save_restore (current_frame_info.small_threshold,
                              FIRST_PSEUDO_REGISTER, addr, 0);
  if (current_frame_info.need_fp)
    frame_move_insn (hard_frame_pointer_rtx, stack_pointer_rtx);
  /* For large frames, allocate bulk of frame.  This is usually joint with one
     register save.  */
  if (current_frame_info.last_slot >= 0)
    {
      gcc_assert (current_frame_info.last_slot != GPR_FP
                  || (!current_frame_info.need_fp
                      && current_frame_info.first_slot < 0));
      off = GEN_INT (-current_frame_info.last_slot_offset);
      mem = gen_frame_mem (BLKmode,
                           gen_rtx_PLUS (Pmode, stack_pointer_rtx, off));
      reg = gen_rtx_REG (Pmode, GPR_IP);
      frame_move_insn (reg, off);
      frame_insn (gen_stack_adjust_str
                   (gen_frame_mem (word_mode, stack_pointer_rtx),
                    gen_rtx_REG (word_mode, current_frame_info.last_slot),
                    reg, mem));
    }
  /* If there is only one or no register to save, yet we have a large frame,
     use an add.  */
  else if (current_frame_info.last_slot_offset)
    {
      mem = gen_frame_mem (BLKmode,
                           plus_constant (Pmode, stack_pointer_rtx,
                                          current_frame_info.last_slot_offset));
      off = GEN_INT (-current_frame_info.last_slot_offset);
      if (!SIMM11 (INTVAL (off)))
        {
          reg = gen_rtx_REG (Pmode, GPR_IP);
          frame_move_insn (reg, off);
          off = reg;
        }
      frame_insn (gen_stack_adjust_add (off, mem));
    }

  /* Mode switching uses get_hard_reg_initial_val after
      emit_initial_value_sets, so we have to fix this up now.  */
  save_config = has_hard_reg_initial_val (SImode, CONFIG_REGNUM);
  if (save_config)
    {
      if (REG_P (save_config))
        {
          if (REGNO (save_config) >= FIRST_PSEUDO_REGISTER)
            gcc_assert (!df_regs_ever_live_p (REGNO (save_config)));
          else
            frame_move_insn (save_config,
                             get_hard_reg_initial_reg (save_config));
        }
      else
        {
          rtx save_dst = save_config;

          reg = gen_rtx_REG (SImode, GPR_IP);
          gcc_assert (MEM_P (save_dst));
          if (!memory_operand (save_dst, SImode))
            {
              rtx addr = XEXP (save_dst, 0);
              rtx reg2 = gen_rtx_REG (SImode, GPR_16);

              gcc_assert (GET_CODE (addr) == PLUS);
              gcc_assert (XEXP (addr, 0) == hard_frame_pointer_rtx
                          || XEXP (addr, 0) == stack_pointer_rtx);
              emit_move_insn (reg2, XEXP (addr, 1));
              save_dst
                = replace_equiv_address (save_dst,
                                         gen_rtx_PLUS (Pmode, XEXP (addr, 0),
                                                       reg2));
            }
          emit_move_insn (reg, get_hard_reg_initial_reg (save_config));
          emit_move_insn (save_dst, reg);
        }
    }
}

void
epiphany_expand_epilogue (int sibcall_p)
{
  int interrupt_p;
  enum epiphany_function_type fn_type;
  rtx mem, addr, reg, off;
  HOST_WIDE_INT restore_offset;

  fn_type = epiphany_compute_function_type( current_function_decl);
  interrupt_p = EPIPHANY_INTERRUPT_P (fn_type);

  /* For variable frames, deallocate bulk of frame.  */
  if (current_frame_info.need_fp)
    {
      mem = gen_frame_mem (BLKmode, stack_pointer_rtx);
      emit_insn (gen_stack_adjust_mov (mem));
    }
  /* Else for large static frames, deallocate bulk of frame.  */
  else if (current_frame_info.last_slot_offset)
    {
      mem = gen_frame_mem (BLKmode, stack_pointer_rtx);
      reg = gen_rtx_REG (Pmode, GPR_IP);
      emit_move_insn (reg, GEN_INT (current_frame_info.last_slot_offset));
      emit_insn (gen_stack_adjust_add (reg, mem));
    }
  restore_offset = (interrupt_p
                    ? - 3 * UNITS_PER_WORD
                    : epiphany_stack_offset - (HOST_WIDE_INT) UNITS_PER_WORD);
  addr = plus_constant (Pmode, stack_pointer_rtx,
                        (current_frame_info.first_slot_offset
                         + restore_offset));
  epiphany_emit_save_restore (current_frame_info.small_threshold,
                           FIRST_PSEUDO_REGISTER, addr, 1);

  if (interrupt_p && !epiphany_uninterruptible_p (current_function_decl))
    emit_insn (gen_gid ());

  off = GEN_INT (current_frame_info.first_slot_offset);
  mem = gen_frame_mem (BLKmode, stack_pointer_rtx);
  /* For large / variable size frames, deallocating the register save area is
     joint with one register restore; for medium size frames, we use a
     dummy post-increment load to dealloacte the whole frame.  */
  if (!SIMM11 (INTVAL (off)) || current_frame_info.last_slot >= 0)
    {
      emit_insn (gen_stack_adjust_ldr
                  (gen_rtx_REG (word_mode,
                                (current_frame_info.last_slot >= 0
                                 ? current_frame_info.last_slot : GPR_IP)),
                   gen_frame_mem (word_mode, stack_pointer_rtx),
                   off,
                   mem));
    }
  /* While for small frames, we deallocate the entire frame with one add.  */
  else if (INTVAL (off))
    {
      emit_insn (gen_stack_adjust_add (off, mem));
    }
  if (interrupt_p)
    {
      emit_move_insn (gen_rtx_REG (word_mode, STATUS_REGNUM),
                      gen_rtx_REG (SImode, GPR_0));
      emit_move_insn (gen_rtx_REG (word_mode, IRET_REGNUM),
                      gen_rtx_REG (SImode, GPR_0+1));
      addr = plus_constant (Pmode, stack_pointer_rtx,
                            - (HOST_WIDE_INT) 2 * UNITS_PER_WORD);
      emit_move_insn (gen_rtx_REG (DImode, GPR_0),
                      gen_frame_mem (DImode, addr));
    }
  addr = plus_constant (Pmode, stack_pointer_rtx,
                        epiphany_stack_offset - (HOST_WIDE_INT) UNITS_PER_WORD);
  epiphany_emit_save_restore (0, current_frame_info.small_threshold, addr, 1);
  if (!sibcall_p)
    {
      if (interrupt_p)
        emit_jump_insn (gen_return_internal_interrupt());
      else
        emit_jump_insn (gen_return_i ());
    }
}

int
epiphany_initial_elimination_offset (int from, int to)
{
  epiphany_compute_frame_size (get_frame_size ());
  if (from == FRAME_POINTER_REGNUM && to == STACK_POINTER_REGNUM)
    return current_frame_info.total_size - current_frame_info.reg_size;
  if (from == FRAME_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM)
    return current_frame_info.first_slot_offset - current_frame_info.reg_size;
  if (from == ARG_POINTER_REGNUM && to == STACK_POINTER_REGNUM)
    return (current_frame_info.total_size
            - ((current_frame_info.pretend_size + 4) & -8));
  if (from == ARG_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM)
    return (current_frame_info.first_slot_offset
            - ((current_frame_info.pretend_size + 4) & -8));
  gcc_unreachable ();
}

bool
epiphany_regno_rename_ok (unsigned, unsigned dst)
{
  enum epiphany_function_type fn_type;

  fn_type = epiphany_compute_function_type (current_function_decl);
  if (!EPIPHANY_INTERRUPT_P (fn_type))
    return true;
  if (df_regs_ever_live_p (dst))
    return true;
  return false;
}

static int
epiphany_issue_rate (void)
{
  return 2;
}

/* Function to update the integer COST
   based on the relationship between INSN that is dependent on
   DEP_INSN through the dependence LINK.  The default is to make no
   adjustment to COST.  This can be used for example to specify to
   the scheduler that an output- or anti-dependence does not incur
   the same cost as a data-dependence.  The return value should be
   the new value for COST.  */
static int
epiphany_adjust_cost (rtx insn, rtx link, rtx dep_insn, int cost)
{
  if (REG_NOTE_KIND (link) == 0)
    {
      rtx dep_set;

      if (recog_memoized (insn) < 0
          || recog_memoized (dep_insn) < 0)
        return cost;

      dep_set = single_set (dep_insn);

      /* The latency that we specify in the scheduling description refers
         to the actual output, not to an auto-increment register; for that,
         the latency is one.  */
      if (dep_set && MEM_P (SET_SRC (dep_set)) && cost > 1)
        {
          rtx set = single_set (insn);

          if (set
              && !reg_mentioned_p (SET_DEST (dep_set), SET_SRC (set))
              && (!MEM_P (SET_DEST (set))
                  || !reg_mentioned_p (SET_DEST (dep_set),
                                       XEXP (SET_DEST (set), 0))))
            cost = 1;
        }
    }
  return cost;
}

#define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)

#define RTX_OK_FOR_BASE_P(X) \
  (REG_P (X) && REG_OK_FOR_BASE_P (X))

#define RTX_OK_FOR_INDEX_P(MODE, X) \
  ((GET_MODE_CLASS (MODE) != MODE_VECTOR_INT \
    || epiphany_vect_align >= GET_MODE_SIZE (MODE)) \
   && (REG_P (X) && REG_OK_FOR_INDEX_P (X)))

#define LEGITIMATE_OFFSET_ADDRESS_P(MODE, X) \
(GET_CODE (X) == PLUS \
 && RTX_OK_FOR_BASE_P (XEXP (X, 0)) \
 && (RTX_OK_FOR_INDEX_P (MODE, XEXP (X, 1)) \
     || RTX_OK_FOR_OFFSET_P (MODE, XEXP (X, 1))))

static bool
epiphany_legitimate_address_p (enum machine_mode mode, rtx x, bool strict)
{
#define REG_OK_FOR_BASE_P(X) \
  (strict ? GPR_P (REGNO (X)) : GPR_AP_OR_PSEUDO_P (REGNO (X)))
  if (RTX_OK_FOR_BASE_P (x))
    return true;
  if (RTX_FRAME_OFFSET_P (x))
    return true;
  if (LEGITIMATE_OFFSET_ADDRESS_P (mode, x))
    return true;
  /* If this is a misaligned stack access, don't force it to reg+index.  */
  if (GET_MODE_SIZE (mode) == 8
      && GET_CODE (x) == PLUS && XEXP (x, 0) == stack_pointer_rtx
      /* Decomposed to SImode; GET_MODE_SIZE (SImode) == 4 */
      && !(INTVAL (XEXP (x, 1)) & 3)
      && INTVAL (XEXP (x, 1)) >= -2047 * 4
      && INTVAL (XEXP (x, 1)) <=  2046 * 4)
    return true;
  if (TARGET_POST_INC
      && (GET_CODE (x) == POST_DEC || GET_CODE (x) == POST_INC)
      && RTX_OK_FOR_BASE_P (XEXP ((x), 0)))
    return true;
  if ((TARGET_POST_MODIFY || reload_completed)
      && GET_CODE (x) == POST_MODIFY
      && GET_CODE (XEXP ((x), 1)) == PLUS
      && rtx_equal_p (XEXP ((x), 0), XEXP (XEXP ((x), 1), 0))
      && LEGITIMATE_OFFSET_ADDRESS_P (mode, XEXP ((x), 1)))
    return true;
  if (mode == BLKmode)
    return true;
  return false;
}

static reg_class_t
epiphany_secondary_reload (bool in_p, rtx x, reg_class_t rclass,
                        enum machine_mode mode ATTRIBUTE_UNUSED,
                        secondary_reload_info *sri)
{
  /* This could give more reload inheritance, but we are missing some
     reload infrastructure.  */
 if (0)
  if (in_p && GET_CODE (x) == UNSPEC
      && satisfies_constraint_Sra (x) && !satisfies_constraint_Rra (x))
    {
      gcc_assert (rclass == GENERAL_REGS);
      sri->icode = CODE_FOR_reload_insi_ra;
      return NO_REGS;
    }
  return NO_REGS;
}

bool
epiphany_is_long_call_p (rtx x)
{
  tree decl = SYMBOL_REF_DECL (x);
  bool ret_val = !TARGET_SHORT_CALLS;
  tree attrs;

  /* ??? Is it safe to default to ret_val if decl is NULL?  We should
     probably encode information via encode_section_info, and also
     have (an) option(s) to take SYMBOL_FLAG_LOCAL and/or SYMBOL_FLAG_EXTERNAL
     into account.  */
  if (decl)
    {
      attrs = TYPE_ATTRIBUTES (TREE_TYPE (decl));
      if (lookup_attribute ("long_call", attrs))
        ret_val = true;
      else if (lookup_attribute ("short_call", attrs))
        ret_val = false;
    }
  return ret_val;
}

bool
epiphany_small16 (rtx x)
{
  rtx base = x;
  rtx offs ATTRIBUTE_UNUSED = const0_rtx;

  if (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == PLUS)
    {
      base = XEXP (XEXP (x, 0), 0);
      offs = XEXP (XEXP (x, 0), 1);
    }
  if (GET_CODE (base) == SYMBOL_REF && SYMBOL_REF_FUNCTION_P (base)
      && epiphany_is_long_call_p (base))
    return false;
  return TARGET_SMALL16 != 0;
}

/* Return nonzero if it is ok to make a tail-call to DECL.  */
static bool
epiphany_function_ok_for_sibcall (tree decl, tree exp)
{
  bool cfun_interrupt_p, call_interrupt_p;

  cfun_interrupt_p = EPIPHANY_INTERRUPT_P (epiphany_compute_function_type
                                        (current_function_decl));
  if (decl)
    call_interrupt_p = EPIPHANY_INTERRUPT_P (epiphany_compute_function_type (decl));
  else
    {
      tree fn_type = TREE_TYPE (CALL_EXPR_FN (exp));

      gcc_assert (POINTER_TYPE_P (fn_type));
      fn_type = TREE_TYPE (fn_type);
      gcc_assert (TREE_CODE (fn_type) == FUNCTION_TYPE
                  || TREE_CODE (fn_type) == METHOD_TYPE);
      call_interrupt_p
        = lookup_attribute ("interrupt", TYPE_ATTRIBUTES (fn_type)) != NULL;
    }

  /* Don't tailcall from or to an ISR routine - although we could in
     principle tailcall from one ISR routine to another, we'd need to
     handle this in sibcall_epilogue to make it work.  */
  if (cfun_interrupt_p || call_interrupt_p)
    return false;

  /* Everything else is ok.  */
  return true;
}

/* T is a function declaration or the MEM_EXPR of a MEM passed to a call
   expander.
   Return true iff the type of T has the uninterruptible attribute.
   If T is NULL, return false.  */
bool
epiphany_uninterruptible_p (tree t)
{
  tree attrs;

  if (t)
    {
      attrs = TYPE_ATTRIBUTES (TREE_TYPE (t));
      if (lookup_attribute ("disinterrupt", attrs))
        return true;
    }
  return false;
}

bool
epiphany_call_uninterruptible_p (rtx mem)
{
  rtx addr = XEXP (mem, 0);
  tree t = NULL_TREE;

  if (GET_CODE (addr) == SYMBOL_REF)
    t = SYMBOL_REF_DECL (addr);
  if (!t)
    t = MEM_EXPR (mem);
  return epiphany_uninterruptible_p (t);
}

static enum machine_mode
epiphany_promote_function_mode (const_tree type, enum machine_mode mode,
                                int *punsignedp ATTRIBUTE_UNUSED,
                                const_tree funtype ATTRIBUTE_UNUSED,
                                int for_return ATTRIBUTE_UNUSED)
{
  int dummy;

  return promote_mode (type, mode, &dummy);
}

static void
epiphany_conditional_register_usage (void)
{
  int i;

  if (PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM)
    {
      fixed_regs[PIC_OFFSET_TABLE_REGNUM] = 1;
      call_used_regs[PIC_OFFSET_TABLE_REGNUM] = 1;
    }
  if (TARGET_HALF_REG_FILE)
    {
      for (i = 32; i <= 63; i++)
        {
          fixed_regs[i] = 1;
          call_used_regs[i] = 1;
        }
    }
  if (epiphany_m1reg >= 0)
    {
      fixed_regs[epiphany_m1reg] = 1;
      call_used_regs[epiphany_m1reg] = 1;
    }
  if (!TARGET_PREFER_SHORT_INSN_REGS)
    CLEAR_HARD_REG_SET (reg_class_contents[SHORT_INSN_REGS]);
  COPY_HARD_REG_SET (reg_class_contents[SIBCALL_REGS],
                     reg_class_contents[GENERAL_REGS]);
  /* It would be simpler and quicker if we could just use
     AND_COMPL_HARD_REG_SET, alas, call_used_reg_set is yet uninitialized;
     it is set up later by our caller.  */
  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
    if (!call_used_regs[i])
      CLEAR_HARD_REG_BIT (reg_class_contents[SIBCALL_REGS], i);
}

/* Determine where to put an argument to a function.
   Value is zero to push the argument on the stack,
   or a hard register in which to store the argument.

   MODE is the argument's machine mode.
   TYPE is the data type of the argument (as a tree).
    This is null for libcalls where that information may
    not be available.
   CUM is a variable of type CUMULATIVE_ARGS which gives info about
    the preceding args and about the function being called.
   NAMED is nonzero if this argument is a named parameter
    (otherwise it is an extra parameter matching an ellipsis).  */
/* On the EPIPHANY the first MAX_EPIPHANY_PARM_REGS args are normally in
   registers and the rest are pushed.  */
static rtx
epiphany_function_arg (cumulative_args_t cum_v, enum machine_mode mode,
                       const_tree type, bool named ATTRIBUTE_UNUSED)
{
  CUMULATIVE_ARGS cum = *get_cumulative_args (cum_v);

  if (PASS_IN_REG_P (cum, mode, type))
    return gen_rtx_REG (mode, ROUND_ADVANCE_CUM (cum, mode, type));
  return 0;
}

/* Update the data in CUM to advance over an argument
   of mode MODE and data type TYPE.
   (TYPE is null for libcalls where that information may not be available.)  */
static void
epiphany_function_arg_advance (cumulative_args_t cum_v, enum machine_mode mode,
                               const_tree type, bool named ATTRIBUTE_UNUSED)
{
  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);

  *cum = ROUND_ADVANCE_CUM (*cum, mode, type) + ROUND_ADVANCE_ARG (mode, type);
}
\f
/* Nested function support.
   An epiphany trampoline looks like this:
   mov r16,%low(fnaddr)
   movt r16,%high(fnaddr)
   mov ip,%low(cxt)
   movt ip,%high(cxt)
   jr r16  */

#define EPIPHANY_LOW_RTX(X) \
  (gen_rtx_IOR (SImode, \
    gen_rtx_ASHIFT (SImode, \
                    gen_rtx_AND (SImode, (X), GEN_INT (0xff)), GEN_INT (5)), \
    gen_rtx_ASHIFT (SImode, \
                    gen_rtx_AND (SImode, (X), GEN_INT (0xff00)), GEN_INT (12))))
#define EPIPHANY_HIGH_RTX(X) \
  EPIPHANY_LOW_RTX (gen_rtx_LSHIFTRT (SImode, (X), GEN_INT (16)))

/* Emit RTL insns to initialize the variable parts of a trampoline.
   FNADDR is an RTX for the address of the function's pure code.
   CXT is an RTX for the static chain value for the function.  */
static void
epiphany_trampoline_init (rtx tramp_mem, tree fndecl, rtx cxt)
{
  rtx fnaddr = XEXP (DECL_RTL (fndecl), 0);
  rtx tramp = force_reg (Pmode, XEXP (tramp_mem, 0));

  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (Pmode, tramp, 0)),
                  gen_rtx_IOR (SImode, GEN_INT (0x4002000b),
                               EPIPHANY_LOW_RTX (fnaddr)));
  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (Pmode, tramp, 4)),
                  gen_rtx_IOR (SImode, GEN_INT (0x5002000b),
                               EPIPHANY_HIGH_RTX (fnaddr)));
  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (Pmode, tramp, 8)),
                  gen_rtx_IOR (SImode, GEN_INT (0x2002800b),
                               EPIPHANY_LOW_RTX (cxt)));
  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (Pmode, tramp, 12)),
                  gen_rtx_IOR (SImode, GEN_INT (0x3002800b),
                               EPIPHANY_HIGH_RTX (cxt)));
  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (Pmode, tramp, 16)),
                  GEN_INT (0x0802014f));
}
\f
bool
epiphany_optimize_mode_switching (int entity)
{
  if (MACHINE_FUNCTION (cfun)->sw_entities_processed & (1 << entity))
    return false;
  switch (entity)
    {
    case EPIPHANY_MSW_ENTITY_AND:
    case EPIPHANY_MSW_ENTITY_OR:
      return true;
    case EPIPHANY_MSW_ENTITY_NEAREST:
    case EPIPHANY_MSW_ENTITY_TRUNC:
      return optimize > 0;
    case EPIPHANY_MSW_ENTITY_ROUND_UNKNOWN:
      return MACHINE_FUNCTION (cfun)->unknown_mode_uses != 0;
    case EPIPHANY_MSW_ENTITY_ROUND_KNOWN:
      return (MACHINE_FUNCTION (cfun)->sw_entities_processed
              & (1 << EPIPHANY_MSW_ENTITY_ROUND_UNKNOWN)) != 0;
    case EPIPHANY_MSW_ENTITY_FPU_OMNIBUS:
      return optimize == 0 || current_pass == &pass_mode_switch_use.pass;
    }
  gcc_unreachable ();
}

int
epiphany_mode_priority_to_mode (int entity, unsigned priority)
{
  if (entity == EPIPHANY_MSW_ENTITY_AND || entity == EPIPHANY_MSW_ENTITY_OR)
    return priority;
  if (priority > 3)
    switch (priority)
      {
      case 4: return FP_MODE_ROUND_UNKNOWN;
      case 5: return FP_MODE_NONE;
      default: gcc_unreachable ();
      }
  switch ((enum attr_fp_mode) epiphany_normal_fp_mode)
    {
      case FP_MODE_INT:
        switch (priority)
          {
          case 0: return FP_MODE_INT;
          case 1: return epiphany_normal_fp_rounding;
          case 2: return (epiphany_normal_fp_rounding == FP_MODE_ROUND_NEAREST
                          ? FP_MODE_ROUND_TRUNC : FP_MODE_ROUND_NEAREST);
          case 3: return FP_MODE_CALLER;
          }
      case FP_MODE_ROUND_NEAREST:
      case FP_MODE_CALLER:
        switch (priority)
          {
          case 0: return FP_MODE_ROUND_NEAREST;
          case 1: return FP_MODE_ROUND_TRUNC;
          case 2: return FP_MODE_INT;
          case 3: return FP_MODE_CALLER;
          }
      case FP_MODE_ROUND_TRUNC:
        switch (priority)
          {
          case 0: return FP_MODE_ROUND_TRUNC;
          case 1: return FP_MODE_ROUND_NEAREST;
          case 2: return FP_MODE_INT;
          case 3: return FP_MODE_CALLER;
          }
      case FP_MODE_ROUND_UNKNOWN:
      case FP_MODE_NONE:
        gcc_unreachable ();
    }
  gcc_unreachable ();
}

int
epiphany_mode_needed (int entity, rtx insn)
{
  enum attr_fp_mode mode;

  if (recog_memoized (insn) < 0)
    {
      if (entity == EPIPHANY_MSW_ENTITY_AND
          || entity == EPIPHANY_MSW_ENTITY_OR)
        return 2;
      return FP_MODE_NONE;
    }
  mode = get_attr_fp_mode (insn);

  switch (entity)
  {
  case EPIPHANY_MSW_ENTITY_AND:
    return mode != FP_MODE_INT ? 1 : 2;
  case EPIPHANY_MSW_ENTITY_OR:
    return mode == FP_MODE_INT ? 1 : 2;
  case EPIPHANY_MSW_ENTITY_ROUND_KNOWN:
    if (recog_memoized (insn) == CODE_FOR_set_fp_mode)
      mode = (enum attr_fp_mode) epiphany_mode_after (entity, mode, insn);
    /* Fall through.  */
  case EPIPHANY_MSW_ENTITY_NEAREST:
  case EPIPHANY_MSW_ENTITY_TRUNC:
    if (mode == FP_MODE_ROUND_UNKNOWN)
      {
        MACHINE_FUNCTION (cfun)->unknown_mode_uses++;
        return FP_MODE_NONE;
      }
    return mode;
  case EPIPHANY_MSW_ENTITY_ROUND_UNKNOWN:
    if (mode == FP_MODE_ROUND_NEAREST || mode == FP_MODE_ROUND_TRUNC)
        return FP_MODE_ROUND_UNKNOWN;
    return mode;
  case EPIPHANY_MSW_ENTITY_FPU_OMNIBUS:
    if (mode == FP_MODE_ROUND_UNKNOWN)
      return epiphany_normal_fp_rounding;
    return mode;
  default:
    gcc_unreachable ();
  }
}

int
epiphany_mode_entry_exit (int entity, bool exit)
{
  int normal_mode = epiphany_normal_fp_mode ;

  MACHINE_FUNCTION (cfun)->sw_entities_processed |= (1 << entity);
  if (epiphany_is_interrupt_p (current_function_decl))
    normal_mode = FP_MODE_CALLER;
  switch (entity)
    {
    case EPIPHANY_MSW_ENTITY_AND:
      if (exit)
        return normal_mode != FP_MODE_INT ? 1 : 2;
      return 0;
    case EPIPHANY_MSW_ENTITY_OR:
      if (exit)
        return normal_mode == FP_MODE_INT ? 1 : 2;
      return 0;
    case EPIPHANY_MSW_ENTITY_ROUND_UNKNOWN:
      if (normal_mode == FP_MODE_ROUND_NEAREST
          || normal_mode == FP_MODE_ROUND_TRUNC)
      return FP_MODE_ROUND_UNKNOWN;
      /* Fall through.  */
    case EPIPHANY_MSW_ENTITY_NEAREST:
    case EPIPHANY_MSW_ENTITY_TRUNC:
    case EPIPHANY_MSW_ENTITY_ROUND_KNOWN:
    case EPIPHANY_MSW_ENTITY_FPU_OMNIBUS:
      return normal_mode;
    default:
      gcc_unreachable ();
    }
}

int
epiphany_mode_after (int entity, int last_mode, rtx insn)
{
  /* We have too few call-saved registers to hope to keep the masks across
     calls.  */
  if (entity == EPIPHANY_MSW_ENTITY_AND || entity == EPIPHANY_MSW_ENTITY_OR)
    {
      if (GET_CODE (insn) == CALL_INSN)
        return 0;
      return last_mode;
    }
  if (recog_memoized (insn) < 0)
    return last_mode;
  if (get_attr_fp_mode (insn) == FP_MODE_ROUND_UNKNOWN
      && last_mode != FP_MODE_ROUND_NEAREST && last_mode != FP_MODE_ROUND_TRUNC)
    {
      if (entity == EPIPHANY_MSW_ENTITY_NEAREST)
        return FP_MODE_ROUND_NEAREST;
      if (entity == EPIPHANY_MSW_ENTITY_TRUNC)
        return FP_MODE_ROUND_TRUNC;
    }
  if (recog_memoized (insn) == CODE_FOR_set_fp_mode)
    {
      rtx src = SET_SRC (XVECEXP (PATTERN (insn), 0, 0));
      int fp_mode;

      if (REG_P (src))
        return FP_MODE_CALLER;
      fp_mode = INTVAL (XVECEXP (XEXP (src, 0), 0, 0));
      if (entity == EPIPHANY_MSW_ENTITY_ROUND_UNKNOWN
          && (fp_mode == FP_MODE_ROUND_NEAREST
              || fp_mode == EPIPHANY_MSW_ENTITY_TRUNC))
        return FP_MODE_ROUND_UNKNOWN;
      return fp_mode;
    }
  return last_mode;
}

void
emit_set_fp_mode (int entity, int mode, HARD_REG_SET regs_live ATTRIBUTE_UNUSED)
{
  rtx save_cc, cc_reg, mask, src, src2;
  enum attr_fp_mode fp_mode;

  if (!MACHINE_FUNCTION (cfun)->and_mask)
    {
      MACHINE_FUNCTION (cfun)->and_mask = gen_reg_rtx (SImode);
      MACHINE_FUNCTION (cfun)->or_mask = gen_reg_rtx (SImode);
    }
  if (entity == EPIPHANY_MSW_ENTITY_AND)
    {
      gcc_assert (mode >= 0 && mode <= 2);
      if (mode == 1)
        emit_move_insn (MACHINE_FUNCTION (cfun)->and_mask,
                        gen_int_mode (0xfff1fffe, SImode));
      return;
    }
  else if (entity == EPIPHANY_MSW_ENTITY_OR)
    {
      gcc_assert (mode >= 0 && mode <= 2);
      if (mode == 1)
        emit_move_insn (MACHINE_FUNCTION (cfun)->or_mask, GEN_INT(0x00080000));
      return;
    }
  fp_mode = (enum attr_fp_mode) mode;
  src = NULL_RTX;

  switch (fp_mode)
    {
      case FP_MODE_CALLER:
        src = get_hard_reg_initial_val (SImode, CONFIG_REGNUM);
        mask = MACHINE_FUNCTION (cfun)->and_mask;
        break;
      case FP_MODE_ROUND_UNKNOWN:
        MACHINE_FUNCTION (cfun)->unknown_mode_sets++;
        mask = MACHINE_FUNCTION (cfun)->and_mask;
        break;
      case FP_MODE_ROUND_NEAREST:
        if (entity == EPIPHANY_MSW_ENTITY_TRUNC)
          return;
        mask = MACHINE_FUNCTION (cfun)->and_mask;
        break;
      case FP_MODE_ROUND_TRUNC:
        if (entity == EPIPHANY_MSW_ENTITY_NEAREST)
          return;
        mask = MACHINE_FUNCTION (cfun)->and_mask;
        break;
      case FP_MODE_INT:
        mask = MACHINE_FUNCTION (cfun)->or_mask;
        break;
      case FP_MODE_NONE:
      default:
        gcc_unreachable ();
    }
  save_cc = gen_reg_rtx (CCmode);
  cc_reg = gen_rtx_REG (CCmode, CC_REGNUM);
  emit_move_insn (save_cc, cc_reg);
  mask = force_reg (SImode, mask);
  if (!src)
    {
      rtvec v = gen_rtvec (1, GEN_INT (fp_mode));

      src = gen_rtx_CONST (SImode, gen_rtx_UNSPEC (SImode, v, UNSPEC_FP_MODE));
    }
  if (entity == EPIPHANY_MSW_ENTITY_ROUND_KNOWN
      || entity == EPIPHANY_MSW_ENTITY_FPU_OMNIBUS)
    src2 = copy_rtx (src);
  else
    {
      rtvec v = gen_rtvec (1, GEN_INT (FP_MODE_ROUND_UNKNOWN));

      src2 = gen_rtx_CONST (SImode, gen_rtx_UNSPEC (SImode, v, UNSPEC_FP_MODE));
    }
  emit_insn (gen_set_fp_mode (src, src2, mask));
  emit_move_insn (cc_reg, save_cc);
}

void
epiphany_expand_set_fp_mode (rtx *operands)
{
  rtx ctrl = gen_rtx_REG (SImode, CONFIG_REGNUM);
  rtx src = operands[0];
  rtx mask_reg = operands[2];
  rtx scratch = operands[3];
  enum attr_fp_mode fp_mode;


  gcc_assert (rtx_equal_p (src, operands[1])
              /* Sometimes reload gets silly and reloads the same pseudo
                 into different registers.  */
              || (REG_P (src) && REG_P (operands[1])));

  if (!epiphany_uninterruptible_p (current_function_decl))
    emit_insn (gen_gid ());
  emit_move_insn (scratch, ctrl);

  if (GET_CODE (src) == REG)
    {
      /* FP_MODE_CALLER */
      emit_insn (gen_xorsi3 (scratch, scratch, src));
      emit_insn (gen_andsi3 (scratch, scratch, mask_reg));
      emit_insn (gen_xorsi3 (scratch, scratch, src));
    }
  else
    {
      gcc_assert (GET_CODE (src) == CONST);
      src = XEXP (src, 0);
      fp_mode = (enum attr_fp_mode) INTVAL (XVECEXP (src, 0, 0));
      switch (fp_mode)
        {
        case FP_MODE_ROUND_NEAREST:
          emit_insn (gen_andsi3 (scratch, scratch, mask_reg));
          break;
        case FP_MODE_ROUND_TRUNC:
          emit_insn (gen_andsi3 (scratch, scratch, mask_reg));
          emit_insn (gen_add2_insn (scratch, const1_rtx));
          break;
        case FP_MODE_INT:
          emit_insn (gen_iorsi3 (scratch, scratch, mask_reg));
          break;
        case FP_MODE_CALLER:
        case FP_MODE_ROUND_UNKNOWN:
        case FP_MODE_NONE:
          gcc_unreachable ();
        }
    }
  emit_move_insn (ctrl, scratch);
  if (!epiphany_uninterruptible_p (current_function_decl))
    emit_insn (gen_gie ());
}

void
epiphany_insert_mode_switch_use (rtx insn,
                                 int entity ATTRIBUTE_UNUSED,
                                 int mode ATTRIBUTE_UNUSED)
{
  rtx pat = PATTERN (insn);
  rtvec v;
  int len, i;
  rtx near = gen_rtx_REG (SImode, FP_NEAREST_REGNUM);
  rtx trunc = gen_rtx_REG (SImode, FP_TRUNCATE_REGNUM);

  if (entity != EPIPHANY_MSW_ENTITY_FPU_OMNIBUS)
    return;
  switch ((enum attr_fp_mode) get_attr_fp_mode (insn))
    {
      case FP_MODE_ROUND_NEAREST:
        near = gen_rtx_USE (VOIDmode, near);
        trunc = gen_rtx_CLOBBER (VOIDmode, trunc);
        break;
      case FP_MODE_ROUND_TRUNC:
        near = gen_rtx_CLOBBER (VOIDmode, near);
        trunc = gen_rtx_USE (VOIDmode, trunc);
        break;
      case FP_MODE_ROUND_UNKNOWN:
        near = gen_rtx_USE (VOIDmode, gen_rtx_REG (SImode, FP_ANYFP_REGNUM));
        trunc = copy_rtx (near);
        /* Fall through.  */
      case FP_MODE_INT:
      case FP_MODE_CALLER:
        near = gen_rtx_USE (VOIDmode, near);
        trunc = gen_rtx_USE (VOIDmode, trunc);
        break;
      case FP_MODE_NONE:
        gcc_unreachable ();
    }
  gcc_assert (GET_CODE (pat) == PARALLEL);
  len = XVECLEN (pat, 0);
  v = rtvec_alloc (len + 2);
  for (i = 0; i < len; i++)
    RTVEC_ELT (v, i) = XVECEXP (pat, 0, i);
  RTVEC_ELT (v, len) = near;
  RTVEC_ELT (v, len + 1) = trunc;
  pat = gen_rtx_PARALLEL (VOIDmode, v);
  PATTERN (insn) = pat;
  MACHINE_FUNCTION (cfun)->control_use_inserted = true;
}

bool
epiphany_epilogue_uses (int regno)
{
  if (regno == GPR_LR)
    return true;
  if (reload_completed && epiphany_is_interrupt_p (current_function_decl))
    {
      if (fixed_regs[regno]
          && regno != STATUS_REGNUM && regno != IRET_REGNUM
          && regno != FP_NEAREST_REGNUM && regno != FP_TRUNCATE_REGNUM)
        return false;
      return true;
    }
  if (regno == FP_NEAREST_REGNUM
      && epiphany_normal_fp_mode != FP_MODE_ROUND_TRUNC)
    return true;
  if (regno == FP_TRUNCATE_REGNUM
      && epiphany_normal_fp_mode != FP_MODE_ROUND_NEAREST)
    return true;
  return false;
}

static unsigned int
epiphany_min_divisions_for_recip_mul (enum machine_mode mode)
{
  if (flag_reciprocal_math && mode == SFmode)
    /* We'll expand into a multiply-by-reciprocal anyway, so we might a well do
       it already at the tree level and expose it to further optimizations.  */
    return 1;
  return default_min_divisions_for_recip_mul (mode);
}

static enum machine_mode
epiphany_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED)
{
  return TARGET_VECT_DOUBLE ? DImode : SImode;
}

static bool
epiphany_vector_mode_supported_p (enum machine_mode mode)
{
  if (mode == V2SFmode)
    return true;
  if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT
      && (GET_MODE_SIZE (mode) == 4 || GET_MODE_SIZE (mode) == 8))
    return true;
  return false;
}

static bool
epiphany_vector_alignment_reachable (const_tree type, bool is_packed)
{
  /* Vectors which aren't in packed structures will not be less aligned than
     the natural alignment of their element type, so this is safe.  */
  if (TYPE_ALIGN_UNIT (type) == 4)
    return !is_packed;

  return default_builtin_vector_alignment_reachable (type, is_packed);
}

static bool
epiphany_support_vector_misalignment (enum machine_mode mode, const_tree type,
                                      int misalignment, bool is_packed)
{
  if (GET_MODE_SIZE (mode) == 8 && misalignment % 4 == 0)
    return true;
  return default_builtin_support_vector_misalignment (mode, type, misalignment,
                                                      is_packed);
}

/* STRUCTURE_SIZE_BOUNDARY seems a bit crude in how it enlarges small
   structs.  Make structs double-word-aligned it they are a double word or
   (potentially) larger;  failing that, do the same for a size of 32 bits.  */
unsigned
epiphany_special_round_type_align (tree type, unsigned computed,
                                   unsigned specified)
{
  unsigned align = MAX (computed, specified);
  tree field;
  HOST_WIDE_INT total, max;
  unsigned try_align = FASTEST_ALIGNMENT;

  if (maximum_field_alignment && try_align > maximum_field_alignment)
    try_align = maximum_field_alignment;
  if (align >= try_align)
    return align;
  for (max = 0, field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
    {
      tree offset, size;

      if (TREE_CODE (field) != FIELD_DECL
          || TREE_TYPE (field) == error_mark_node)
        continue;
      offset = bit_position (field);
      size = DECL_SIZE (field);
      if (!host_integerp (offset, 1) || !host_integerp (size, 1)
          || TREE_INT_CST_LOW (offset) >= try_align
          || TREE_INT_CST_LOW (size) >= try_align)
        return try_align;
      total = TREE_INT_CST_LOW (offset) + TREE_INT_CST_LOW (size);
      if (total > max)
        max = total;
    }
  if (max >= (HOST_WIDE_INT) try_align)
    align = try_align;
  else if (try_align > 32 && max >= 32)
    align = max > 32 ? 64 : 32;
  return align;
}

/* Upping the alignment of arrays in structs is not only a performance
   enhancement, it also helps preserve assumptions about how
   arrays-at-the-end-of-structs work, like for struct gcov_fn_info in
   libgcov.c .  */
unsigned
epiphany_adjust_field_align (tree field, unsigned computed)
{
  if (computed == 32
      && TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE)
    {
      tree elmsz = TYPE_SIZE (TREE_TYPE (TREE_TYPE (field)));

      if (!host_integerp (elmsz, 1) || tree_low_cst (elmsz, 1) >= 32)
        return 64;
    }
  return computed;
}

/* Output code to add DELTA to the first argument, and then jump
   to FUNCTION.  Used for C++ multiple inheritance.  */
static void
epiphany_output_mi_thunk (FILE *file, tree thunk ATTRIBUTE_UNUSED,
                          HOST_WIDE_INT delta,
                          HOST_WIDE_INT vcall_offset,
                          tree function)
{
  int this_regno
    = aggregate_value_p (TREE_TYPE (TREE_TYPE (function)), function) ? 1 : 0;
  const char *this_name = reg_names[this_regno];
  const char *fname;

  /* We use IP and R16 as a scratch registers.  */
  gcc_assert (call_used_regs [GPR_IP]);
  gcc_assert (call_used_regs [GPR_16]);

  /* Add DELTA.  When possible use a plain add, otherwise load it into
     a register first. */
  if (delta == 0)
    ; /* Done.  */
  else if (SIMM11 (delta))
    asm_fprintf (file, "\tadd\t%s,%s,%d\n", this_name, this_name, (int) delta);
  else if (delta < 0 && delta >= -0xffff)
    {
      asm_fprintf (file, "\tmov\tip,%d\n", (int) -delta);
      asm_fprintf (file, "\tsub\t%s,%s,ip\n", this_name, this_name);
    }
  else
    {
      asm_fprintf (file, "\tmov\tip,%%low(%ld)\n", (long) delta);
      if (delta & ~0xffff)
        asm_fprintf (file, "\tmovt\tip,%%high(%ld)\n", (long) delta);
      asm_fprintf (file, "\tadd\t%s,%s,ip\n", this_name, this_name);
    }

  /* If needed, add *(*THIS + VCALL_OFFSET) to THIS.  */
  if (vcall_offset != 0)
    {
      /* ldr ip,[this]          --> temp = *this
         ldr ip,[ip,vcall_offset] > temp = *(*this + vcall_offset)
         add this,this,ip       --> this+ = *(*this + vcall_offset) */
      asm_fprintf (file, "\tldr\tip, [%s]\n", this_name);
      if (vcall_offset < -0x7ff * 4 || vcall_offset > 0x7ff * 4
          || (vcall_offset & 3) != 0)
        {
          asm_fprintf (file, "\tmov\tr16, %%low(%ld)\n", (long) vcall_offset);
          asm_fprintf (file, "\tmovt\tr16, %%high(%ld)\n", (long) vcall_offset);
          asm_fprintf (file, "\tldr\tip, [ip,r16]\n");
        }
      else
        asm_fprintf (file, "\tldr\tip, [ip,%d]\n", (int) vcall_offset / 4);
      asm_fprintf (file, "\tadd\t%s, %s, ip\n", this_name, this_name);
    }

  fname = XSTR (XEXP (DECL_RTL (function), 0), 0);
  if (epiphany_is_long_call_p (XEXP (DECL_RTL (function), 0)))
    {
      fputs ("\tmov\tip,%low(", file);
      assemble_name (file, fname);
      fputs (")\n\tmovt\tip,%high(", file);
      assemble_name (file, fname);
      fputs (")\n\tjr ip\n", file);
    }
  else
    {
      fputs ("\tb\t", file);
      assemble_name (file, fname);
      fputc ('\n', file);
    }
}

void
epiphany_start_function (FILE *file, const char *name, tree decl)
{
  /* If the function doesn't fit into the on-chip memory, it will have a
     section attribute - or lack of it - that denotes it goes somewhere else.
     But the architecture spec says that an interrupt vector still has to
     point to on-chip memory.  So we must place a jump there to get to the
     actual function implementation.  The forwarder_section attribute
     specifies the section where this jump goes.
     This mechanism can also be useful to have a shortcall destination for
     a function that is actually placed much farther away.  */
  tree attrs, int_attr, int_names, int_name, forwarder_attr;

  attrs = DECL_ATTRIBUTES (decl);
  int_attr = lookup_attribute ("interrupt", attrs);
  if (int_attr)
    for (int_names = TREE_VALUE (int_attr); int_names;
         int_names = TREE_CHAIN (int_names))
      {
        char buf[99];

        int_name = TREE_VALUE (int_names);
        sprintf (buf, "ivt_entry_%.80s", TREE_STRING_POINTER (int_name));
        switch_to_section (get_section (buf, SECTION_CODE, decl));
        fputs ("\tb\t", file);
        assemble_name (file, name);
        fputc ('\n', file);
      }
  forwarder_attr = lookup_attribute ("forwarder_section", attrs);
  if (forwarder_attr)
    {
      const char *prefix = "__forwarder_dst_";
      char *dst_name = (char *) alloca (strlen (prefix) + strlen (name) + 1);

      strcpy (dst_name, prefix);
      strcat (dst_name, name);
      forwarder_attr = TREE_VALUE (TREE_VALUE (forwarder_attr));
      switch_to_section (get_section (TREE_STRING_POINTER (forwarder_attr),
                         SECTION_CODE, decl));
      ASM_OUTPUT_FUNCTION_LABEL (file, name, decl);
      if (epiphany_is_long_call_p (XEXP (DECL_RTL (decl), 0)))
        {
          int tmp = GPR_0;

          if (int_attr)
            fputs ("\tstrd r0,[sp,-1]\n", file);
          else
            tmp = GPR_16;
          gcc_assert (call_used_regs[tmp]);
          fprintf (file, "\tmov r%d,%%low(", tmp);
          assemble_name (file, dst_name);
          fprintf (file, ")\n"
                   "\tmovt r%d,%%high(", tmp);
          assemble_name (file, dst_name);
          fprintf (file, ")\n"
                 "\tjr r%d\n", tmp);
        }
      else
        {
          fputs ("\tb\t", file);
          assemble_name (file, dst_name);
          fputc ('\n', file);
        }
      name = dst_name;
    }
  switch_to_section (function_section (decl));
  ASM_OUTPUT_FUNCTION_LABEL (file, name, decl);
}

struct gcc_target targetm = TARGET_INITIALIZER;