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diff --git a/gcc/ssa.h b/gcc/ssa.h
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+/* Static Single Assignment (SSA) definitions for GNU C-Compiler
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   Written by Jeffrey D. Oldham <oldham@codesourcery.com>.
+
+This file is part of GNU CC.
+
+GNU CC 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.
+
+GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+
+/* Main SSA routines.  */
+extern void convert_to_ssa		PARAMS ((void));
+extern void convert_from_ssa		PARAMS ((void));
+typedef int (*successor_phi_fn)         PARAMS ((rtx, int, int, void *));
+extern int for_each_successor_phi       PARAMS ((basic_block bb,
+						 successor_phi_fn,
+						 void *));
+
+/* Optimizations.  */
+/* In dce.c */
+extern void eliminate_dead_code		PARAMS ((void));
+
+/* SSA definitions and uses.  */
+/* This flag is set when the CFG is in SSA form.  */
+extern int in_ssa_form;
+
+/* Element I is the single instruction that sets register I.  */
+extern varray_type ssa_definition;
+
+/* Element I is an INSN_LIST of instructions that use register I.  */
+extern varray_type ssa_uses;
+
+
+/* Specify which hard registers should be converted.  */
+
+/* All pseudo-registers (having register number >=
+   FIRST_PSEUDO_REGISTER) and hard registers satisfying
+   CONVERT_HARD_REGISTER_TO_SSA_P are converted to SSA form.  */
+
+/* Given a hard register number REG_NO, return nonzero if and only if
+   the register should be converted to SSA.  */
+
+#ifndef CONVERT_HARD_REGISTER_TO_SSA_P
+#define CONVERT_HARD_REGISTER_TO_SSA_P(REG_NO) (0) /* default of no hard registers */
+#endif /* CONVERT_HARD_REGISTER_TO_SSA_P  */
+
+/* Given a register number REG_NO, return nonzero if and only if the
+   register should be converted to SSA.  */
+
+#define CONVERT_REGISTER_TO_SSA_P(REG_NO)	\
+	((!HARD_REGISTER_NUM_P (REG_NO)) || \
+	 (CONVERT_HARD_REGISTER_TO_SSA_P (REG_NO)))