Check in gcc sources for prebuilt toolchains in Eclair.

1 files changed, 1364 insertions, 0 deletions

diff --git a/gcc-4.2.1/gcc/config/score/score.c b/gcc-4.2.1/gcc/config/score/score.c
new file mode 100644
index 000000000..0b2c67315
--- /dev/null
+++ b/gcc-4.2.1/gcc/config/score/score.c
@@ -0,0 +1,1364 @@
+/* Output routines for Sunplus S+CORE processor
+   Copyright (C) 2005 Free Software Foundation, Inc.
+   Contributed by Sunnorth.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 2, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING.  If not, write to
+   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include <signal.h>
+#include "rtl.h"
+#include "regs.h"
+#include "hard-reg-set.h"
+#include "real.h"
+#include "insn-config.h"
+#include "conditions.h"
+#include "insn-attr.h"
+#include "recog.h"
+#include "toplev.h"
+#include "output.h"
+#include "tree.h"
+#include "function.h"
+#include "expr.h"
+#include "optabs.h"
+#include "flags.h"
+#include "reload.h"
+#include "tm_p.h"
+#include "ggc.h"
+#include "gstab.h"
+#include "hashtab.h"
+#include "debug.h"
+#include "target.h"
+#include "target-def.h"
+#include "integrate.h"
+#include "langhooks.h"
+#include "cfglayout.h"
+#include "score-mdaux.h"
+
+#define GR_REG_CLASS_P(C)        ((C) == G16_REGS || (C) == G32_REGS)
+#define SP_REG_CLASS_P(C) \
+  ((C) == CN_REG || (C) == LC_REG || (C) == SC_REG || (C) == SP_REGS)
+#define CP_REG_CLASS_P(C) \
+  ((C) == CP1_REGS || (C) == CP2_REGS || (C) == CP3_REGS || (C) == CPA_REGS)
+#define CE_REG_CLASS_P(C) \
+  ((C) == HI_REG || (C) == LO_REG || (C) == CE_REGS)
+
+static int score_arg_partial_bytes (const CUMULATIVE_ARGS *,
+                                    enum machine_mode, tree, int);
+
+static int score_symbol_insns (enum score_symbol_type);
+
+static int score_address_insns (rtx, enum machine_mode);
+
+static bool score_rtx_costs (rtx, enum rtx_code, enum rtx_code, int *);
+
+static int score_address_cost (rtx);
+
+#undef  TARGET_ASM_FILE_START
+#define TARGET_ASM_FILE_START           th_asm_file_start
+
+#undef  TARGET_ASM_FILE_END
+#define TARGET_ASM_FILE_END             th_asm_file_end
+
+#undef  TARGET_ASM_FUNCTION_PROLOGUE
+#define TARGET_ASM_FUNCTION_PROLOGUE    th_function_prologue
+
+#undef  TARGET_ASM_FUNCTION_EPILOGUE
+#define TARGET_ASM_FUNCTION_EPILOGUE    th_function_epilogue
+
+#undef  TARGET_SCHED_ISSUE_RATE
+#define TARGET_SCHED_ISSUE_RATE         th_issue_rate
+
+#undef TARGET_ASM_SELECT_RTX_SECTION
+#define TARGET_ASM_SELECT_RTX_SECTION   th_select_rtx_section
+
+#undef  TARGET_IN_SMALL_DATA_P
+#define TARGET_IN_SMALL_DATA_P          th_in_small_data_p
+
+#undef  TARGET_FUNCTION_OK_FOR_SIBCALL
+#define TARGET_FUNCTION_OK_FOR_SIBCALL  th_function_ok_for_sibcall
+
+#undef TARGET_STRICT_ARGUMENT_NAMING
+#define TARGET_STRICT_ARGUMENT_NAMING   th_strict_argument_naming
+
+#undef TARGET_ASM_OUTPUT_MI_THUNK
+#define TARGET_ASM_OUTPUT_MI_THUNK      th_output_mi_thunk
+
+#undef TARGET_ASM_CAN_OUTPUT_MI_THUNK
+#define TARGET_ASM_CAN_OUTPUT_MI_THUNK  hook_bool_tree_hwi_hwi_tree_true
+
+#undef TARGET_PROMOTE_FUNCTION_ARGS
+#define TARGET_PROMOTE_FUNCTION_ARGS    hook_bool_tree_true
+
+#undef TARGET_PROMOTE_FUNCTION_RETURN
+#define TARGET_PROMOTE_FUNCTION_RETURN  hook_bool_tree_true
+
+#undef TARGET_PROMOTE_PROTOTYPES
+#define TARGET_PROMOTE_PROTOTYPES       hook_bool_tree_true
+
+#undef TARGET_MUST_PASS_IN_STACK
+#define TARGET_MUST_PASS_IN_STACK       must_pass_in_stack_var_size
+
+#undef TARGET_ARG_PARTIAL_BYTES
+#define TARGET_ARG_PARTIAL_BYTES        score_arg_partial_bytes
+
+#undef TARGET_PASS_BY_REFERENCE
+#define TARGET_PASS_BY_REFERENCE        score_pass_by_reference
+
+#undef TARGET_RETURN_IN_MEMORY
+#define TARGET_RETURN_IN_MEMORY         score_return_in_memory
+
+#undef TARGET_RTX_COSTS
+#define TARGET_RTX_COSTS                score_rtx_costs
+
+#undef TARGET_ADDRESS_COST
+#define TARGET_ADDRESS_COST             score_address_cost
+
+#undef TARGET_DEFAULT_TARGET_FLAGS
+#define TARGET_DEFAULT_TARGET_FLAGS     TARGET_DEFAULT
+
+/* Implement TARGET_RETURN_IN_MEMORY.  In S+core,
+   small structures are returned in a register.
+   Objects with varying size must still be returned in memory.  */
+static bool
+score_return_in_memory (tree type, tree fndecl ATTRIBUTE_UNUSED)
+{
+  return ((TYPE_MODE (type) == BLKmode)
+          || (int_size_in_bytes (type) > 2 * UNITS_PER_WORD)
+          || (int_size_in_bytes (type) == -1));
+}
+
+/* Return nonzero when an argument must be passed by reference.  */
+static bool
+score_pass_by_reference (CUMULATIVE_ARGS *cum ATTRIBUTE_UNUSED,
+                         enum machine_mode mode, tree type,
+                         bool named ATTRIBUTE_UNUSED)
+{
+  /* If we have a variable-sized parameter, we have no choice.  */
+  return targetm.calls.must_pass_in_stack (mode, type);
+}
+
+/* Return a legitimate address for REG + OFFSET.  */
+static rtx
+score_add_offset (rtx temp, rtx reg, HOST_WIDE_INT offset)
+{
+  if (!IMM_IN_RANGE (offset, 15, 1))
+    {
+      reg = expand_simple_binop (GET_MODE (reg), PLUS,
+                                 gen_int_mode (offset & 0xffffc000,
+                                               GET_MODE (reg)),
+                                 reg, NULL, 0, OPTAB_WIDEN);
+      offset &= 0x3fff;
+    }
+
+  return plus_constant (reg, offset);
+}
+
+/* Implement TARGET_ASM_OUTPUT_MI_THUNK.  Generate rtl rather than asm text
+   in order to avoid duplicating too much logic from elsewhere.  */
+static void
+th_output_mi_thunk (FILE *file, tree thunk_fndecl ATTRIBUTE_UNUSED,
+                    HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset,
+                    tree function)
+{
+  rtx this, temp1, temp2, insn, fnaddr;
+
+  /* Pretend to be a post-reload pass while generating rtl.  */
+  no_new_pseudos = 1;
+  reload_completed = 1;
+  reset_block_changes ();
+
+  /* We need two temporary registers in some cases.  */
+  temp1 = gen_rtx_REG (Pmode, 8);
+  temp2 = gen_rtx_REG (Pmode, 9);
+
+  /* Find out which register contains the "this" pointer.  */
+  if (aggregate_value_p (TREE_TYPE (TREE_TYPE (function)), function))
+    this = gen_rtx_REG (Pmode, ARG_REG_FIRST + 1);
+  else
+    this = gen_rtx_REG (Pmode, ARG_REG_FIRST);
+
+  /* Add DELTA to THIS.  */
+  if (delta != 0)
+    {
+      rtx offset = GEN_INT (delta);
+      if (!CONST_OK_FOR_LETTER_P (delta, 'L'))
+        {
+          emit_move_insn (temp1, offset);
+          offset = temp1;
+        }
+      emit_insn (gen_add3_insn (this, this, offset));
+    }
+
+  /* If needed, add *(*THIS + VCALL_OFFSET) to THIS.  */
+  if (vcall_offset != 0)
+    {
+      rtx addr;
+
+      /* Set TEMP1 to *THIS.  */
+      emit_move_insn (temp1, gen_rtx_MEM (Pmode, this));
+
+      /* Set ADDR to a legitimate address for *THIS + VCALL_OFFSET.  */
+      addr = score_add_offset (temp2, temp1, vcall_offset);
+
+      /* Load the offset and add it to THIS.  */
+      emit_move_insn (temp1, gen_rtx_MEM (Pmode, addr));
+      emit_insn (gen_add3_insn (this, this, temp1));
+    }
+
+  /* Jump to the target function.  */
+  fnaddr = XEXP (DECL_RTL (function), 0);
+  insn = emit_call_insn (gen_sibcall_internal (fnaddr, const0_rtx));
+  SIBLING_CALL_P (insn) = 1;
+
+  /* Run just enough of rest_of_compilation.  This sequence was
+     "borrowed" from alpha.c.  */
+  insn = get_insns ();
+  insn_locators_initialize ();
+  split_all_insns_noflow ();
+  shorten_branches (insn);
+  final_start_function (insn, file, 1);
+  final (insn, file, 1);
+  final_end_function ();
+
+  /* Clean up the vars set above.  Note that final_end_function resets
+     the global pointer for us.  */
+  reload_completed = 0;
+  no_new_pseudos = 0;
+}
+
+/* Implement TARGET_STRICT_ARGUMENT_NAMING.  */
+static bool
+th_strict_argument_naming (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
+{
+  return true;
+}
+
+/* Implement TARGET_FUNCTION_OK_FOR_SIBCALL.  */
+static bool
+th_function_ok_for_sibcall (ATTRIBUTE_UNUSED tree decl,
+                            ATTRIBUTE_UNUSED tree exp)
+{
+  return true;
+}
+
+struct score_arg_info
+{
+  /* The argument's size, in bytes.  */
+  unsigned int num_bytes;
+
+  /* The number of words passed in registers, rounded up.  */
+  unsigned int reg_words;
+
+  /* The offset of the first register from GP_ARG_FIRST or FP_ARG_FIRST,
+     or ARG_REG_NUM if the argument is passed entirely on the stack.  */
+  unsigned int reg_offset;
+
+  /* The number of words that must be passed on the stack, rounded up.  */
+  unsigned int stack_words;
+
+  /* The offset from the start of the stack overflow area of the argument's
+     first stack word.  Only meaningful when STACK_WORDS is nonzero.  */
+  unsigned int stack_offset;
+};
+
+/* Fill INFO with information about a single argument.  CUM is the
+   cumulative state for earlier arguments.  MODE is the mode of this
+   argument and TYPE is its type (if known).  NAMED is true if this
+   is a named (fixed) argument rather than a variable one.  */
+static void
+classify_arg (const CUMULATIVE_ARGS *cum, enum machine_mode mode,
+              tree type, int named, struct score_arg_info *info)
+{
+  int even_reg_p;
+  unsigned int num_words, max_regs;
+
+  even_reg_p = 0;
+  if (GET_MODE_CLASS (mode) == MODE_INT
+      || GET_MODE_CLASS (mode) == MODE_FLOAT)
+    even_reg_p = (GET_MODE_SIZE (mode) > UNITS_PER_WORD);
+  else
+    if (type != NULL_TREE && TYPE_ALIGN (type) > BITS_PER_WORD && named)
+      even_reg_p = 1;
+
+  if (TARGET_MUST_PASS_IN_STACK (mode, type))
+    info->reg_offset = ARG_REG_NUM;
+  else
+    {
+      info->reg_offset = cum->num_gprs;
+      if (even_reg_p)
+        info->reg_offset += info->reg_offset & 1;
+    }
+
+  if (mode == BLKmode)
+    info->num_bytes = int_size_in_bytes (type);
+  else
+    info->num_bytes = GET_MODE_SIZE (mode);
+
+  num_words = (info->num_bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+  max_regs = ARG_REG_NUM - info->reg_offset;
+
+  /* Partition the argument between registers and stack.  */
+  info->reg_words = MIN (num_words, max_regs);
+  info->stack_words = num_words - info->reg_words;
+
+  /* The alignment applied to registers is also applied to stack arguments.  */
+  if (info->stack_words)
+    {
+      info->stack_offset = cum->stack_words;
+      if (even_reg_p)
+        info->stack_offset += info->stack_offset & 1;
+    }
+}
+
+/* Set up the stack and frame (if desired) for the function.  */
+static void
+th_function_prologue (FILE *file, HOST_WIDE_INT size ATTRIBUTE_UNUSED)
+{
+  const char *fnname;
+  struct score_frame_info *f = mda_cached_frame ();
+  HOST_WIDE_INT tsize = f->total_size;
+
+  fnname = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
+  if (!flag_inhibit_size_directive)
+    {
+      fputs ("\t.ent\t", file);
+      assemble_name (file, fnname);
+      fputs ("\n", file);
+    }
+  assemble_name (file, fnname);
+  fputs (":\n", file);
+
+  if (!flag_inhibit_size_directive)
+    {
+      fprintf (file,
+               "\t.frame\t%s," HOST_WIDE_INT_PRINT_DEC ",%s, %d\t\t"
+               "# vars= " HOST_WIDE_INT_PRINT_DEC ", regs= %d"
+               ", args= " HOST_WIDE_INT_PRINT_DEC
+               ", gp= " HOST_WIDE_INT_PRINT_DEC "\n",
+               (reg_names[(frame_pointer_needed)
+                ? HARD_FRAME_POINTER_REGNUM : STACK_POINTER_REGNUM]),
+               tsize,
+               reg_names[RA_REGNUM],
+               current_function_is_leaf ? 1 : 0,
+               f->var_size,
+               f->num_gp,
+               f->args_size,
+               f->cprestore_size);
+
+      fprintf(file, "\t.mask\t0x%08x," HOST_WIDE_INT_PRINT_DEC "\n",
+              f->mask,
+              (f->gp_sp_offset - f->total_size));
+    }
+}
+
+/* Do any necessary cleanup after a function to restore stack, frame,
+   and regs.  */
+static void
+th_function_epilogue (FILE *file,
+                      HOST_WIDE_INT size ATTRIBUTE_UNUSED)
+{
+  if (!flag_inhibit_size_directive)
+    {
+      const char *fnname;
+      fnname = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
+      fputs ("\t.end\t", file);
+      assemble_name (file, fnname);
+      fputs ("\n", file);
+    }
+}
+
+/* Implement TARGET_SCHED_ISSUE_RATE.  */
+static int
+th_issue_rate (void)
+{
+  return 1;
+}
+
+/* Returns true if X contains a SYMBOL_REF.  */
+static bool
+symbolic_expression_p (rtx x)
+{
+  if (GET_CODE (x) == SYMBOL_REF)
+    return true;
+
+  if (GET_CODE (x) == CONST)
+    return symbolic_expression_p (XEXP (x, 0));
+
+  if (UNARY_P (x))
+    return symbolic_expression_p (XEXP (x, 0));
+
+  if (ARITHMETIC_P (x))
+    return (symbolic_expression_p (XEXP (x, 0))
+            || symbolic_expression_p (XEXP (x, 1)));
+
+  return false;
+}
+
+/* Choose the section to use for the constant rtx expression X that has
+   mode MODE.  */
+static section *
+th_select_rtx_section (enum machine_mode mode, rtx x,
+                       unsigned HOST_WIDE_INT align)
+{
+  if (GET_MODE_SIZE (mode) <= SCORE_SDATA_MAX)
+    return get_named_section (0, ".sdata", 0);
+  else if (flag_pic && symbolic_expression_p (x))
+    return get_named_section (0, ".data.rel.ro", 3);
+  else
+    return mergeable_constant_section (mode, align, 0);
+}
+
+/* Implement TARGET_IN_SMALL_DATA_P.  */
+static bool
+th_in_small_data_p (tree decl)
+{
+  HOST_WIDE_INT size;
+
+  if (TREE_CODE (decl) == STRING_CST
+      || TREE_CODE (decl) == FUNCTION_DECL)
+    return false;
+
+  if (TREE_CODE (decl) == VAR_DECL && DECL_SECTION_NAME (decl) != 0)
+    {
+      const char *name;
+      name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
+      if (strcmp (name, ".sdata") != 0
+          && strcmp (name, ".sbss") != 0)
+        return true;
+      if (!DECL_EXTERNAL (decl))
+        return false;
+    }
+  size = int_size_in_bytes (TREE_TYPE (decl));
+  return (size > 0 && size <= SCORE_SDATA_MAX);
+}
+
+/* Implement TARGET_ASM_FILE_START.  */
+static void
+th_asm_file_start (void)
+{
+  default_file_start ();
+  fprintf (asm_out_file, ASM_COMMENT_START
+           "GCC for S+core %s \n", SCORE_GCC_VERSION);
+
+  if (flag_pic)
+    fprintf (asm_out_file, "\t.set pic\n");
+}
+
+/* Implement TARGET_ASM_FILE_END.  When using assembler macros, emit
+   .externs for any small-data variables that turned out to be external.  */
+struct extern_list *extern_head = 0;
+
+static void
+th_asm_file_end (void)
+{
+  tree name_tree;
+  struct extern_list *p;
+  if (extern_head)
+    {
+      fputs ("\n", asm_out_file);
+      for (p = extern_head; p != 0; p = p->next)
+        {
+          name_tree = get_identifier (p->name);
+          if (!TREE_ASM_WRITTEN (name_tree)
+              && TREE_SYMBOL_REFERENCED (name_tree))
+            {
+              TREE_ASM_WRITTEN (name_tree) = 1;
+              fputs ("\t.extern\t", asm_out_file);
+              assemble_name (asm_out_file, p->name);
+              fprintf (asm_out_file, ", %d\n", p->size);
+            }
+        }
+    }
+}
+
+static unsigned int sdata_max;
+
+int
+score_sdata_max (void)
+{
+  return sdata_max;
+}
+
+/* default 0 = NO_REGS  */
+enum reg_class score_char_to_class[256];
+
+/* Implement OVERRIDE_OPTIONS macro.  */
+void
+score_override_options (void)
+{
+  flag_pic = false;
+  if (!flag_pic)
+    sdata_max = g_switch_set ? g_switch_value : DEFAULT_SDATA_MAX;
+  else
+    {
+      sdata_max = 0;
+      if (g_switch_set && (g_switch_value != 0))
+        warning (0, "-fPIC and -G are incompatible");
+    }
+
+  score_char_to_class['d'] = G32_REGS;
+  score_char_to_class['e'] = G16_REGS;
+  score_char_to_class['t'] = T32_REGS;
+
+  score_char_to_class['h'] = HI_REG;
+  score_char_to_class['l'] = LO_REG;
+  score_char_to_class['x'] = CE_REGS;
+
+  score_char_to_class['q'] = CN_REG;
+  score_char_to_class['y'] = LC_REG;
+  score_char_to_class['z'] = SC_REG;
+  score_char_to_class['a'] = SP_REGS;
+
+  score_char_to_class['c'] = CR_REGS;
+
+  score_char_to_class['b'] = CP1_REGS;
+  score_char_to_class['f'] = CP2_REGS;
+  score_char_to_class['i'] = CP3_REGS;
+  score_char_to_class['j'] = CPA_REGS;
+}
+
+/* Implement REGNO_REG_CLASS macro.  */
+int
+score_reg_class (int regno)
+{
+  int c;
+  gcc_assert (regno >= 0 && regno < FIRST_PSEUDO_REGISTER);
+
+  if (regno == FRAME_POINTER_REGNUM
+      || regno == ARG_POINTER_REGNUM)
+    return ALL_REGS;
+
+  for (c = 0; c < N_REG_CLASSES; c++)
+    if (TEST_HARD_REG_BIT (reg_class_contents[c], regno))
+      return c;
+
+  return NO_REGS;
+}
+
+/* Implement PREFERRED_RELOAD_CLASS macro.  */
+enum reg_class
+score_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, enum reg_class class)
+{
+  if (reg_class_subset_p (G16_REGS, class))
+    return G16_REGS;
+  if (reg_class_subset_p (G32_REGS, class))
+    return G32_REGS;
+  return class;
+}
+
+/* Implement SECONDARY_INPUT_RELOAD_CLASS
+   and SECONDARY_OUTPUT_RELOAD_CLASS macro.  */
+enum reg_class
+score_secondary_reload_class (enum reg_class class,
+                              enum machine_mode mode ATTRIBUTE_UNUSED,
+                              rtx x)
+{
+  int regno = -1;
+  if (GET_CODE (x) == REG || GET_CODE(x) == SUBREG)
+    regno = true_regnum (x);
+
+  if (!GR_REG_CLASS_P (class))
+    return GP_REG_P (regno) ? NO_REGS : G32_REGS;
+  return NO_REGS;
+}
+
+/* Implement CONST_OK_FOR_LETTER_P macro.  */
+/* imm constraints
+   I        imm16 << 16
+   J        uimm5
+   K        uimm16
+   L        simm16
+   M        uimm14
+   N        simm14  */
+int
+score_const_ok_for_letter_p (HOST_WIDE_INT value, char c)
+{
+  switch (c)
+    {
+    case 'I': return ((value & 0xffff) == 0);
+    case 'J': return IMM_IN_RANGE (value, 5, 0);
+    case 'K': return IMM_IN_RANGE (value, 16, 0);
+    case 'L': return IMM_IN_RANGE (value, 16, 1);
+    case 'M': return IMM_IN_RANGE (value, 14, 0);
+    case 'N': return IMM_IN_RANGE (value, 14, 1);
+    default : return 0;
+    }
+}
+
+/* Implement EXTRA_CONSTRAINT macro.  */
+/* Z        symbol_ref  */
+int
+score_extra_constraint (rtx op, char c)
+{
+  switch (c)
+    {
+    case 'Z':
+      return GET_CODE (op) == SYMBOL_REF;
+    default:
+      gcc_unreachable ();
+    }
+}
+
+/* Return truth value on whether or not a given hard register
+   can support a given mode.  */
+int
+score_hard_regno_mode_ok (unsigned int regno, enum machine_mode mode)
+{
+  int size = GET_MODE_SIZE (mode);
+  enum mode_class class = GET_MODE_CLASS (mode);
+
+  if (class == MODE_CC)
+    return regno == CC_REGNUM;
+  else if (regno == FRAME_POINTER_REGNUM
+           || regno == ARG_POINTER_REGNUM)
+    return class == MODE_INT;
+  else if (GP_REG_P (regno))
+    /* ((regno <= (GP_REG_LAST- HARD_REGNO_NREGS (dummy, mode)) + 1)  */
+    return !(regno & 1) || (size <= UNITS_PER_WORD);
+  else if (CE_REG_P (regno))
+    return (class == MODE_INT
+            && ((size <= UNITS_PER_WORD)
+                || (regno == CE_REG_FIRST && size == 2 * UNITS_PER_WORD)));
+  else
+    return (class == MODE_INT) && (size <= UNITS_PER_WORD);
+}
+
+/* Implement INITIAL_ELIMINATION_OFFSET.  FROM is either the frame
+   pointer or argument pointer.  TO is either the stack pointer or
+   hard frame pointer.  */
+HOST_WIDE_INT
+score_initial_elimination_offset (int from,
+                                  int to ATTRIBUTE_UNUSED)
+{
+  struct score_frame_info *f = mda_compute_frame_size (get_frame_size ());
+  switch (from)
+    {
+    case ARG_POINTER_REGNUM:
+      return f->total_size;
+    case FRAME_POINTER_REGNUM:
+      return 0;
+    default:
+      gcc_unreachable ();
+    }
+}
+
+/* Argument support functions.  */
+
+/* Initialize CUMULATIVE_ARGS for a function.  */
+void
+score_init_cumulative_args (CUMULATIVE_ARGS *cum,
+                            tree fntype ATTRIBUTE_UNUSED,
+                            rtx libname ATTRIBUTE_UNUSED)
+{
+  memset (cum, 0, sizeof (CUMULATIVE_ARGS));
+}
+
+/* Implement FUNCTION_ARG_ADVANCE macro.  */
+void
+score_function_arg_advance (CUMULATIVE_ARGS *cum, enum machine_mode mode,
+                            tree type, int named)
+{
+  struct score_arg_info info;
+  classify_arg (cum, mode, type, named, &info);
+  cum->num_gprs = info.reg_offset + info.reg_words;
+  if (info.stack_words > 0)
+    cum->stack_words = info.stack_offset + info.stack_words;
+  cum->arg_number++;
+}
+
+/* Implement TARGET_ARG_PARTIAL_BYTES macro.  */
+static int
+score_arg_partial_bytes (const CUMULATIVE_ARGS *cum,
+                         enum machine_mode mode, tree type, int named)
+{
+  struct score_arg_info info;
+  classify_arg (cum, mode, type, named, &info);
+  return info.stack_words > 0 ? info.reg_words * UNITS_PER_WORD : 0;
+}
+
+/* Implement FUNCTION_ARG macro.  */
+rtx
+score_function_arg (const CUMULATIVE_ARGS *cum, enum machine_mode mode,
+                    tree type, int named)
+{
+  struct score_arg_info info;
+
+  if (mode == VOIDmode || !named)
+    return 0;
+
+  classify_arg (cum, mode, type, named, &info);
+
+  if (info.reg_offset == ARG_REG_NUM)
+    return 0;
+
+  if (!info.stack_words)
+    return gen_rtx_REG (mode, ARG_REG_FIRST + info.reg_offset);
+  else
+    {
+      rtx ret = gen_rtx_PARALLEL (mode, rtvec_alloc (info.reg_words));
+      unsigned int i, part_offset = 0;
+      for (i = 0; i < info.reg_words; i++)
+        {
+          rtx reg;
+          reg = gen_rtx_REG (SImode, ARG_REG_FIRST + info.reg_offset + i);
+          XVECEXP (ret, 0, i) = gen_rtx_EXPR_LIST (SImode, reg,
+                                                   GEN_INT (part_offset));
+          part_offset += UNITS_PER_WORD;
+        }
+      return ret;
+    }
+}
+
+/* Implement FUNCTION_VALUE and LIBCALL_VALUE.  For normal calls,
+   VALTYPE is the return type and MODE is VOIDmode.  For libcalls,
+   VALTYPE is null and MODE is the mode of the return value.  */
+rtx
+score_function_value (tree valtype, tree func ATTRIBUTE_UNUSED,
+                      enum machine_mode mode)
+{
+  if (valtype)
+    {
+      int unsignedp;
+      mode = TYPE_MODE (valtype);
+      unsignedp = TYPE_UNSIGNED (valtype);
+      mode = promote_mode (valtype, mode, &unsignedp, 1);
+    }
+  return gen_rtx_REG (mode, RT_REGNUM);
+}
+
+/* Implement INITIALIZE_TRAMPOLINE macro.  */
+void
+score_initialize_trampoline (rtx ADDR, rtx FUNC, rtx CHAIN)
+{
+#define FFCACHE          "_flush_cache"
+#define CODE_SIZE        (TRAMPOLINE_INSNS * UNITS_PER_WORD)
+
+  unsigned int tramp[TRAMPOLINE_INSNS] = {
+    0x8103bc56,                         /* mv      r8, r3          */
+    0x9000bc05,                         /* bl      0x0x8           */
+    0xc1238000 | (CODE_SIZE - 8),       /* lw      r9, &func       */
+    0xc0038000
+    | (STATIC_CHAIN_REGNUM << 21)
+    | (CODE_SIZE - 4),                  /* lw  static chain reg, &chain */
+    0x8068bc56,                         /* mv      r3, r8          */
+    0x8009bc08,                         /* br      r9              */
+    0x0,
+    0x0,
+    };
+  rtx pfunc, pchain;
+  int i;
+
+  for (i = 0; i < TRAMPOLINE_INSNS; i++)
+    emit_move_insn (gen_rtx_MEM (ptr_mode, plus_constant (ADDR, i << 2)),
+                    GEN_INT (tramp[i]));
+
+  pfunc = plus_constant (ADDR, CODE_SIZE);
+  pchain = plus_constant (ADDR, CODE_SIZE + GET_MODE_SIZE (ptr_mode));
+
+  emit_move_insn (gen_rtx_MEM (ptr_mode, pfunc), FUNC);
+  emit_move_insn (gen_rtx_MEM (ptr_mode, pchain), CHAIN);
+  emit_library_call (gen_rtx_SYMBOL_REF (Pmode, FFCACHE),
+                     0, VOIDmode, 2,
+                     ADDR, Pmode,
+                     GEN_INT (TRAMPOLINE_SIZE), SImode);
+#undef FFCACHE
+#undef CODE_SIZE
+}
+
+/* This function is used to implement REG_MODE_OK_FOR_BASE_P macro.  */
+int
+score_regno_mode_ok_for_base_p (int regno, int strict)
+{
+  if (regno >= FIRST_PSEUDO_REGISTER)
+    {
+      if (!strict)
+        return 1;
+      regno = reg_renumber[regno];
+    }
+  if (regno == ARG_POINTER_REGNUM
+      || regno == FRAME_POINTER_REGNUM)
+    return 1;
+  return GP_REG_P (regno);
+}
+
+/* Implement GO_IF_LEGITIMATE_ADDRESS macro.  */
+int
+score_address_p (enum machine_mode mode, rtx x, int strict)
+{
+  struct score_address_info addr;
+
+  return mda_classify_address (&addr, mode, x, strict);
+}
+
+/* Copy VALUE to a register and return that register.  If new psuedos
+   are allowed, copy it into a new register, otherwise use DEST.  */
+static rtx
+score_force_temporary (rtx dest, rtx value)
+{
+  if (!no_new_pseudos)
+    return force_reg (Pmode, value);
+  else
+    {
+      emit_move_insn (copy_rtx (dest), value);
+      return dest;
+    }
+}
+
+/* Return a LO_SUM expression for ADDR.  TEMP is as for score_force_temporary
+   and is used to load the high part into a register.  */
+static rtx
+score_split_symbol (rtx temp, rtx addr)
+{
+  rtx high = score_force_temporary (temp,
+                                    gen_rtx_HIGH (Pmode, copy_rtx (addr)));
+  return gen_rtx_LO_SUM (Pmode, high, addr);
+}
+
+/* This function is used to implement LEGITIMIZE_ADDRESS.  If *XLOC can
+   be legitimized in a way that the generic machinery might not expect,
+   put the new address in *XLOC and return true.  */
+int
+score_legitimize_address (rtx *xloc)
+{
+  enum score_symbol_type symbol_type;
+
+  if (mda_symbolic_constant_p (*xloc, &symbol_type)
+      && symbol_type == SYMBOL_GENERAL)
+    {
+      *xloc = score_split_symbol (0, *xloc);
+      return 1;
+    }
+
+  if (GET_CODE (*xloc) == PLUS
+      && GET_CODE (XEXP (*xloc, 1)) == CONST_INT)
+    {
+      rtx reg = XEXP (*xloc, 0);
+      if (!mda_valid_base_register_p (reg, 0))
+        reg = copy_to_mode_reg (Pmode, reg);
+      *xloc = score_add_offset (NULL, reg, INTVAL (XEXP (*xloc, 1)));
+      return 1;
+    }
+  return 0;
+}
+
+/* Return a number assessing the cost of moving a register in class
+   FROM to class TO. */
+int
+score_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
+                          enum reg_class from, enum reg_class to)
+{
+  if (GR_REG_CLASS_P (from))
+    {
+      if (GR_REG_CLASS_P (to))
+        return 2;
+      else if (SP_REG_CLASS_P (to))
+        return 4;
+      else if (CP_REG_CLASS_P (to))
+        return 5;
+      else if (CE_REG_CLASS_P (to))
+        return 6;
+    }
+  if (GR_REG_CLASS_P (to))
+    {
+      if (GR_REG_CLASS_P (from))
+        return 2;
+      else if (SP_REG_CLASS_P (from))
+        return 4;
+      else if (CP_REG_CLASS_P (from))
+        return 5;
+      else if (CE_REG_CLASS_P (from))
+        return 6;
+    }
+  return 12;
+}
+
+/* Return the number of instructions needed to load a symbol of the
+   given type into a register.  */
+static int
+score_symbol_insns (enum score_symbol_type type)
+{
+  switch (type)
+    {
+    case SYMBOL_GENERAL:
+      return 2;
+
+    case SYMBOL_SMALL_DATA:
+      return 1;
+    }
+
+  gcc_unreachable ();
+}
+
+/* Return the number of instructions needed to load or store a value
+   of mode MODE at X.  Return 0 if X isn't valid for MODE.  */
+static int
+score_address_insns (rtx x, enum machine_mode mode)
+{
+  struct score_address_info addr;
+  int factor;
+
+  if (mode == BLKmode)
+    factor = 1;
+  else
+    factor = (GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+
+  if (mda_classify_address (&addr, mode, x, false))
+    switch (addr.type)
+      {
+      case ADD_REG:
+      case ADD_CONST_INT:
+        return factor;
+
+      case ADD_SYMBOLIC:
+        return factor * score_symbol_insns (addr.symbol_type);
+      }
+  return 0;
+}
+
+/* Implement TARGET_RTX_COSTS macro.  */
+static bool
+score_rtx_costs (rtx x, enum rtx_code code, enum rtx_code outer_code,
+                 int *total)
+{
+  enum machine_mode mode = GET_MODE (x);
+
+  switch (code)
+    {
+    case CONST_INT:
+      if (outer_code == SET)
+        {
+          if (CONST_OK_FOR_LETTER_P (INTVAL (x), 'I')
+              || CONST_OK_FOR_LETTER_P (INTVAL (x), 'L'))
+            *total = COSTS_N_INSNS (1);
+          else
+            *total = COSTS_N_INSNS (2);
+        }
+      else if (outer_code == PLUS || outer_code == MINUS)
+        {
+          if (CONST_OK_FOR_LETTER_P (INTVAL (x), 'N'))
+            *total = 0;
+          else if (CONST_OK_FOR_LETTER_P (INTVAL (x), 'I')
+                   || CONST_OK_FOR_LETTER_P (INTVAL (x), 'L'))
+            *total = 1;
+          else
+            *total = COSTS_N_INSNS (2);
+        }
+      else if (outer_code == AND || outer_code == IOR)
+        {
+          if (CONST_OK_FOR_LETTER_P (INTVAL (x), 'M'))
+            *total = 0;
+          else if (CONST_OK_FOR_LETTER_P (INTVAL (x), 'I')
+                   || CONST_OK_FOR_LETTER_P (INTVAL (x), 'K'))
+            *total = 1;
+          else
+            *total = COSTS_N_INSNS (2);
+        }
+      else
+        {
+          *total = 0;
+        }
+      return true;
+
+    case CONST:
+    case SYMBOL_REF:
+    case LABEL_REF:
+    case CONST_DOUBLE:
+      *total = COSTS_N_INSNS (2);
+      return true;
+
+    case MEM:
+      {
+        /* If the address is legitimate, return the number of
+           instructions it needs, otherwise use the default handling.  */
+        int n = score_address_insns (XEXP (x, 0), GET_MODE (x));
+        if (n > 0)
+          {
+            *total = COSTS_N_INSNS (n + 1);
+            return true;
+          }
+        return false;
+      }
+
+    case FFS:
+      *total = COSTS_N_INSNS (6);
+      return true;
+
+    case NOT:
+      *total = COSTS_N_INSNS (1);
+      return true;
+
+    case AND:
+    case IOR:
+    case XOR:
+      if (mode == DImode)
+        {
+          *total = COSTS_N_INSNS (2);
+          return true;
+        }
+      return false;
+
+    case ASHIFT:
+    case ASHIFTRT:
+    case LSHIFTRT:
+      if (mode == DImode)
+        {
+          *total = COSTS_N_INSNS ((GET_CODE (XEXP (x, 1)) == CONST_INT)
+                                  ? 4 : 12);
+          return true;
+        }
+      return false;
+
+    case ABS:
+      *total = COSTS_N_INSNS (4);
+      return true;
+
+    case PLUS:
+    case MINUS:
+      if (mode == DImode)
+        {
+          *total = COSTS_N_INSNS (4);
+          return true;
+        }
+      *total = COSTS_N_INSNS (1);
+      return true;
+
+    case NEG:
+      if (mode == DImode)
+        {
+          *total = COSTS_N_INSNS (4);
+          return true;
+        }
+      return false;
+
+    case MULT:
+      *total = optimize_size ? COSTS_N_INSNS (2) : COSTS_N_INSNS (12);
+      return true;
+
+    case DIV:
+    case MOD:
+    case UDIV:
+    case UMOD:
+      *total = optimize_size ? COSTS_N_INSNS (2) : COSTS_N_INSNS (33);
+      return true;
+
+    case SIGN_EXTEND:
+    case ZERO_EXTEND:
+      switch (GET_MODE (XEXP (x, 0)))
+        {
+        case QImode:
+        case HImode:
+          if (GET_CODE (XEXP (x, 0)) == MEM)
+            {
+              *total = COSTS_N_INSNS (2);
+
+              if (!TARGET_LITTLE_ENDIAN &&
+                  side_effects_p (XEXP (XEXP (x, 0), 0)))
+                *total = 100;
+            }
+          else
+            *total = COSTS_N_INSNS (1);
+          break;
+
+        default:
+          *total = COSTS_N_INSNS (1);
+          break;
+        }
+      return true;
+
+    default:
+      return false;
+    }
+}
+
+/* Implement TARGET_ADDRESS_COST macro.  */
+int
+score_address_cost (rtx addr)
+{
+  return score_address_insns (addr, SImode);
+}
+
+/* Implement ASM_OUTPUT_EXTERNAL macro.  */
+int
+score_output_external (FILE *file ATTRIBUTE_UNUSED,
+                       tree decl, const char *name)
+{
+  register struct extern_list *p;
+
+  if (th_in_small_data_p (decl))
+    {
+      p = (struct extern_list *) ggc_alloc (sizeof (struct extern_list));
+      p->next = extern_head;
+      p->name = name;
+      p->size = int_size_in_bytes (TREE_TYPE (decl));
+      extern_head = p;
+    }
+  return 0;
+}
+
+/* Output format asm string.  */
+void
+score_declare_object (FILE *stream, const char *name,
+                      const char *directive, const char *fmt, ...)
+{
+  va_list ap;
+  fputs (directive, stream);
+  assemble_name (stream, name);
+  va_start (ap, fmt);
+  vfprintf (stream, fmt, ap);
+  va_end (ap);
+}
+
+/* Implement RETURN_ADDR_RTX.  Note, we do not support moving
+   back to a previous frame.  */
+rtx
+score_return_addr (int count, rtx frame ATTRIBUTE_UNUSED)
+{
+  if (count != 0)
+    return const0_rtx;
+  return get_hard_reg_initial_val (Pmode, RA_REGNUM);
+}
+
+/* Implement PRINT_OPERAND macro.  */
+/* Score-specific operand codes:
+   '['        print .set nor1 directive
+   ']'        print .set r1 directive
+   'U'        print hi part of a CONST_INT rtx
+   'E'        print log2(v)
+   'F'        print log2(~v)
+   'D'        print SFmode const double
+   'S'        selectively print "!" if operand is 15bit instruction accessible
+   'V'        print "v!" if operand is 15bit instruction accessible, or "lfh!"
+   'L'        low  part of DImode reg operand
+   'H'        high part of DImode reg operand
+   'C'        print part of opcode for a branch condition.  */
+void
+score_print_operand (FILE *file, rtx op, int c)
+{
+  enum rtx_code code = -1;
+  if (!PRINT_OPERAND_PUNCT_VALID_P (c))
+    code = GET_CODE (op);
+
+  if (c == '[')
+    {
+      fprintf (file, ".set r1\n");
+    }
+  else if (c == ']')
+    {
+      fprintf (file, "\n\t.set nor1");
+    }
+  else if (c == 'U')
+    {
+      gcc_assert (code == CONST_INT);
+      fprintf (file, HOST_WIDE_INT_PRINT_HEX,
+               (INTVAL (op) >> 16) & 0xffff);
+    }
+  else if (c == 'D')
+    {
+      if (GET_CODE (op) == CONST_DOUBLE)
+        {
+          rtx temp = gen_lowpart (SImode, op);
+          gcc_assert (GET_MODE (op) == SFmode);
+          fprintf (file, HOST_WIDE_INT_PRINT_HEX, INTVAL (temp) & 0xffffffff);
+        }
+      else
+        output_addr_const (file, op);
+    }
+  else if (c == 'S')
+    {
+      gcc_assert (code == REG);
+      if (G16_REG_P (REGNO (op)))
+        fprintf (file, "!");
+    }
+  else if (c == 'V')
+    {
+      gcc_assert (code == REG);
+      fprintf (file, G16_REG_P (REGNO (op)) ? "v!" : "lfh!");
+    }
+  else if (c == 'C')
+    {
+      enum machine_mode mode = GET_MODE (XEXP (op, 0));
+
+      switch (code)
+        {
+        case EQ: fputs ("eq", file); break;
+        case NE: fputs ("ne", file); break;
+        case GT: fputs ("gt", file); break;
+        case GE: fputs (mode != CCmode ? "pl" : "ge", file); break;
+        case LT: fputs (mode != CCmode ? "mi" : "lt", file); break;
+        case LE: fputs ("le", file); break;
+        case GTU: fputs ("gtu", file); break;
+        case GEU: fputs ("cs", file); break;
+        case LTU: fputs ("cc", file); break;
+        case LEU: fputs ("leu", file); break;
+        default:
+          output_operand_lossage ("invalid operand for code: '%c'", code);
+        }
+    }
+  else if (c == 'E')
+    {
+      unsigned HOST_WIDE_INT i;
+      unsigned HOST_WIDE_INT pow2mask = 1;
+      unsigned HOST_WIDE_INT val;
+
+      val = INTVAL (op);
+      for (i = 0; i < 32; i++)
+        {
+          if (val == pow2mask)
+            break;
+          pow2mask <<= 1;
+        }
+      gcc_assert (i < 32);
+      fprintf (file, HOST_WIDE_INT_PRINT_HEX, i);
+    }
+  else if (c == 'F')
+    {
+      unsigned HOST_WIDE_INT i;
+      unsigned HOST_WIDE_INT pow2mask = 1;
+      unsigned HOST_WIDE_INT val;
+
+      val = ~INTVAL (op);
+      for (i = 0; i < 32; i++)
+        {
+          if (val == pow2mask)
+            break;
+          pow2mask <<= 1;
+        }
+      gcc_assert (i < 32);
+      fprintf (file, HOST_WIDE_INT_PRINT_HEX, i);
+    }
+  else if (code == REG)
+    {
+      int regnum = REGNO (op);
+      if ((c == 'H' && !WORDS_BIG_ENDIAN)
+          || (c == 'L' && WORDS_BIG_ENDIAN))
+        regnum ++;
+      fprintf (file, "%s", reg_names[regnum]);
+    }
+  else
+    {
+      switch (code)
+        {
+        case MEM:
+          score_print_operand_address (file, op);
+          break;
+        default:
+          output_addr_const (file, op);
+        }
+    }
+}
+
+/* Implement PRINT_OPERAND_ADDRESS macro.  */
+void
+score_print_operand_address (FILE *file, rtx x)
+{
+  struct score_address_info addr;
+  enum rtx_code code = GET_CODE (x);
+  enum machine_mode mode = GET_MODE (x);
+
+  if (code == MEM)
+    x = XEXP (x, 0);
+
+  if (mda_classify_address (&addr, mode, x, true))
+    {
+      switch (addr.type)
+        {
+        case ADD_REG:
+          {
+            switch (addr.code)
+              {
+              case PRE_DEC:
+                fprintf (file, "[%s,-%ld]+", reg_names[REGNO (addr.reg)],
+                         INTVAL (addr.offset));
+                break;
+              case POST_DEC:
+                fprintf (file, "[%s]+,-%ld", reg_names[REGNO (addr.reg)],
+                         INTVAL (addr.offset));
+                break;
+              case PRE_INC:
+                fprintf (file, "[%s, %ld]+", reg_names[REGNO (addr.reg)],
+                         INTVAL (addr.offset));
+                break;
+              case POST_INC:
+                fprintf (file, "[%s]+, %ld", reg_names[REGNO (addr.reg)],
+                         INTVAL (addr.offset));
+                break;
+              default:
+                fprintf (file, "[%s,%ld]", reg_names[REGNO (addr.reg)],
+                         INTVAL (addr.offset));
+                break;
+              }
+          }
+          return;
+        case ADD_CONST_INT:
+        case ADD_SYMBOLIC:
+          output_addr_const (file, x);
+          return;
+        }
+    }
+  print_rtl (stderr, x);
+  gcc_unreachable ();
+}
+
+/* Implement SELECT_CC_MODE macro.  */
+enum machine_mode
+score_select_cc_mode (enum rtx_code op, rtx x, rtx y)
+{
+  if ((op == EQ || op == NE || op == LT || op == GE)
+      && y == const0_rtx
+      && GET_MODE (x) == SImode)
+    {
+      switch (GET_CODE (x))
+        {
+        case PLUS:
+        case MINUS:
+        case NEG:
+        case AND:
+        case IOR:
+        case XOR:
+        case NOT:
+        case ASHIFT:
+        case LSHIFTRT:
+        case ASHIFTRT:
+          return CC_NZmode;
+
+        case SIGN_EXTEND:
+        case ZERO_EXTEND:
+        case ROTATE:
+        case ROTATERT:
+          return (op == LT || op == GE) ? CC_Nmode : CCmode;
+
+        default:
+          return CCmode;
+        }
+    }
+
+  if ((op == EQ || op == NE)
+      && (GET_CODE (y) == NEG)
+      && register_operand (XEXP (y, 0), SImode)
+      && register_operand (x, SImode))
+    {
+      return CC_NZmode;
+    }
+
+  return CCmode;
+}
+
+struct gcc_target targetm = TARGET_INITIALIZER;