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authorBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
committerBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
commit1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch)
treec607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/regrename.h
parent283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff)
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Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to '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