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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 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
- /* Number of bits in each actual element of a regset. */
-
- #define REGSET_ELT_BITS HOST_BITS_PER_WIDE_INT
-
- /* Type to use for a regset element. Note that lots of code assumes
- that the initial part of a regset that contains information on the
- hard registers is the same format as a HARD_REG_SET. */
-
- #define REGSET_ELT_TYPE HOST_WIDE_INT
-
- /* Define the type for a pointer to a set with a bit for each
- (hard or pseudo) register. */
-
- typedef REGSET_ELT_TYPE *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 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;
-