New files for implementing sms in gcc.

From-SVN: r82236

gcc/ddg.h

+/* DDG - Data Dependence Graph - interface.
+   Copyright (C) 2004
+   Free Software Foundation, Inc.
+   Contributed by Ayal Zaks and Mustafa Hagog <zaks,mustafa@il.ibm.com>
+
+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 2, 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 COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+
+#ifndef GCC_DDG_H
+#define GCC_DDG_H
+
+
+typedef struct ddg_node *ddg_node_ptr;
+typedef struct ddg_edge *ddg_edge_ptr;
+typedef struct ddg *ddg_ptr;
+typedef struct ddg_scc *ddg_scc_ptr;
+typedef struct ddg_all_sccs *ddg_all_sccs_ptr;
+
+typedef enum {TRUE_DEP, OUTPUT_DEP, ANTI_DEP} dep_type;
+typedef enum {REG_OR_MEM_DEP, REG_DEP, MEM_DEP, REG_AND_MEM_DEP}
+	     dep_data_type;
+
+/* The following two macros enables direct access to the successors and
+   predecessors bitmaps held in each ddg_node.  Do not make changes to
+   these bitmaps, unless you want to change the DDG.  */
+#define NODE_SUCCESSORS(x)  ((x)->successors)
+#define NODE_PREDECESSORS(x)  ((x)->predecessors)
+
+/* A structure that represents a node in the DDG.  */
+struct ddg_node
+{
+  /* Each node has a unique CUID index.  These indices increase monotonically
+     (according to the order of the corresponding INSN in the BB), starting
+     from 0 with no gaps.  */
+  int cuid;
+
+  /* The insn represented by the node.  */
+  rtx insn;
+
+  /* A note preceeding INSN (or INSN itself), such that all insns linked
+     from FIRST_NOTE until INSN (inclusive of both) are moved together
+     when reordering the insns.  This takes care of notes that should
+     continue to preceed INSN.  */
+  rtx first_note;
+
+  /* Incoming and outgoing dependency edges.  */
+  ddg_edge_ptr in;
+  ddg_edge_ptr out;
+
+  /* Each bit corresponds to a ddg_node according to its cuid, and is
+     set iff the node is a successor/predecessor of "this" node.  */
+  sbitmap successors;
+  sbitmap predecessors;
+
+  /* For general use by algorithms manipulating the ddg.  */
+  union {
+    int count;
+    void *info;
+  } aux;
+};
+
+/* A structure that represents an edge in the DDG.  */
+struct ddg_edge
+{
+  /* The source and destination nodes of the dependency edge.  */
+  ddg_node_ptr src;
+  ddg_node_ptr dest;
+
+  /* TRUE, OUTPUT or ANTI dependency.  */
+  dep_type type;
+
+  /* REG or MEM dependency.  */
+  dep_data_type data_type;
+
+  /* Latency of the depedency.  */
+  int latency;
+
+  /* The distance: number of loop iterations the dependency crosses.  */
+  int distance;
+
+  /* The following two fields are used to form a linked list of the in/out
+     going edges to/from each node.  */
+  ddg_edge_ptr next_in;
+  ddg_edge_ptr next_out;
+
+  /* For general use by algorithms manipulating the ddg.  */
+  union {
+    int count;
+    void *info;
+  } aux;
+};
+
+/* This structure holds the Data Dependence Graph for a basic block.  */
+struct ddg
+{
+  /* The basic block for which this DDG is built.  */
+  basic_block bb;
+
+  /* Number of instructions in the basic block.  */
+  int num_nodes;
+
+  /* Number of load/store instructions in the BB - statistics.  */
+  int num_loads;
+  int num_stores;
+
+  /* This array holds the nodes in the graph; it is indexed by the node
+     cuid, which follows the order of the instructions in the BB.  */
+  ddg_node_ptr nodes;
+
+  /* The branch closing the loop.  */
+  ddg_node_ptr closing_branch;
+
+  /* Build dependence edges for closing_branch, when set.  In certain cases,
+     the closing branch can be dealt with separately from the insns of the
+     loop, and then no such deps are needed.  */
+  int closing_branch_deps;
+
+  /* Array and number of backarcs (edges with distance > 0) in the DDG.  */
+  ddg_edge_ptr *backarcs;
+  int num_backarcs;
+};
+
+
+/* Holds information on an SCC (Strongly Connected Component) of the DDG.  */
+struct ddg_scc
+{
+  /* A bitmap that represents the nodes of the DDG that are in the SCC.  */
+  sbitmap nodes;
+
+  /* Array and number of backarcs (edges with distance > 0) in the SCC.  */
+  ddg_edge_ptr *backarcs;
+  int num_backarcs;
+
+  /* The maximum of (total_latency/total_distance) over all cycles in SCC.  */
+  int recurrence_length;
+};
+
+/* This structure holds the SCCs of the DDG.  */
+struct ddg_all_sccs
+{
+  /* Array that holds the SCCs in the DDG, and their number.  */
+  ddg_scc_ptr *sccs;
+  int num_sccs;
+
+  ddg_ptr ddg;
+};
+
+
+ddg_ptr create_ddg (basic_block, struct df *, int closing_branch_deps);
+void free_ddg (ddg_ptr);
+
+void print_ddg (FILE *, ddg_ptr);
+void vcg_print_ddg (FILE *, ddg_ptr);
+void print_ddg_edge (FILE *, ddg_edge_ptr);
+
+ddg_node_ptr get_node_of_insn (ddg_ptr, rtx);
+
+void find_successors (sbitmap result, ddg_ptr, sbitmap);
+void find_predecessors (sbitmap result, ddg_ptr, sbitmap);
+
+ddg_all_sccs_ptr create_ddg_all_sccs (ddg_ptr);
+void free_ddg_all_sccs (ddg_all_sccs_ptr);
+
+int find_nodes_on_paths (sbitmap result, ddg_ptr, sbitmap from, sbitmap to);
+int longest_simple_path (ddg_ptr, int from, int to, sbitmap via);
+
+#endif /* GCC_DDG_H */