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diff --git a/gcc-1.40/basic-block.h b/gcc-1.40/basic-block.h
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+/* Define control and data flow tables, and regsets.
+   Copyright (C) 1987 Free Software Foundation, Inc.
+
+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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+/* Define the type for a pointer to a set with a bit for each
+   (hard or pseudo) register.  */
+
+typedef long *regset;
+
+/* Size of a regset for the current function,
+   in (1) bytes and (2) elements.  */
+
+extern int regset_bytes;
+extern int regset_size;
+
+/* Number of bits in each actual element of a regset.  */
+
+#define REGSET_ELT_BITS HOST_BITS_PER_INT
+
+/* Number of basic blocks in the current function.  */
+
+extern int n_basic_blocks;
+
+/* Index by basic block number, get first insn in the block.  */
+
+extern rtx *basic_block_head;
+
+/* Index by basic block number, get last insn in the block.  */
+
+extern rtx *basic_block_end;
+
+/* Index by basic block number, get address of regset
+   describing the registers live at the start of that block.  */
+
+extern regset *basic_block_live_at_start;
+
+/* Indexed by n, gives number of basic block that  (REG n) is used in.
+   If the value is REG_BLOCK_GLOBAL (-2),
+   it means (REG n) is used in more than one basic block.
+   REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
+   This information remains valid for the rest of the compilation
+   of the current function; it is used to control register allocation.  */
+
+#define REG_BLOCK_UNKNOWN -1
+#define REG_BLOCK_GLOBAL -2
+extern short *reg_basic_block;