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diff --git a/gcc-4.9/gcc/regrename.h b/gcc-4.9/gcc/regrename.h
new file mode 100644
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+++ b/gcc-4.9/gcc/regrename.h
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+/* This file contains definitions for the register renamer.
+   Copyright (C) 2011-2014 Free Software Foundation, 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/>.  */
+
+#ifndef GCC_REGRENAME_H
+#define GCC_REGRENAME_H
+
+/* We keep linked lists of DU_HEAD structures, each of which describes
+   a chain of occurrences of a reg.  */
+struct du_head
+{
+  /* The next chain.  */
+  struct du_head *next_chain;
+  /* The first and last elements of this chain.  */
+  struct du_chain *first, *last;
+  /* Describes the register being tracked.  */
+  unsigned regno;
+  int nregs;
+
+  /* A unique id to be used as an index into the conflicts bitmaps.  */
+  unsigned id;
+  /* A bitmap to record conflicts with other chains.  */
+  bitmap_head conflicts;
+  /* Conflicts with untracked hard registers.  */
+  HARD_REG_SET hard_conflicts;
+
+  /* Nonzero if the chain crosses a call.  */
+  unsigned int need_caller_save_reg:1;
+  /* Nonzero if the register is used in a way that prevents renaming,
+     such as the SET_DEST of a CALL_INSN or an asm operand that used
+     to be a hard register.  */
+  unsigned int cannot_rename:1;
+};
+
+typedef struct du_head *du_head_p;
+
+/* This struct describes a single occurrence of a register.  */
+struct du_chain
+{
+  /* Links to the next occurrence of the register.  */
+  struct du_chain *next_use;
+
+  /* The insn where the register appears.  */
+  rtx insn;
+  /* The location inside the insn.  */
+  rtx *loc;
+  /* The register class required by the insn at this location.  */
+  ENUM_BITFIELD(reg_class) cl : 16;
+};
+
+/* This struct describes data gathered during regrename_analyze about
+   a single operand of an insn.  */
+struct operand_rr_info
+{
+  /* The number of chains recorded for this operand.  */
+  int n_chains;
+  /* Holds either the chain for the operand itself, or for the registers in
+     a memory operand.  */
+  struct du_chain *chains[MAX_REGS_PER_ADDRESS];
+  struct du_head *heads[MAX_REGS_PER_ADDRESS];
+};
+
+/* A struct to hold a vector of operand_rr_info structures describing the
+   operands of an insn.  */
+struct insn_rr_info
+{
+  operand_rr_info *op_info;
+};
+
+
+extern vec<insn_rr_info> insn_rr;
+
+extern void regrename_init (bool);
+extern void regrename_finish (void);
+extern void regrename_analyze (bitmap);
+extern du_head_p regrename_chain_from_id (unsigned int);
+extern int find_best_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *,
+				 int);
+extern void regrename_do_replace (du_head_p, int);
+
+#endif