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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [ddg.h] - Blame information for rev 859

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1 280 jeremybenn
/* DDG - Data Dependence Graph - interface.
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   Copyright (C) 2004, 2005, 2006, 2007, 2008
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   Free Software Foundation, Inc.
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   Contributed by Ayal Zaks and Mustafa Hagog <zaks,mustafa@il.ibm.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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#ifndef GCC_DDG_H
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#define GCC_DDG_H
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/* For sbitmap.  */
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#include "sbitmap.h"
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/* For basic_block.  */
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#include "basic-block.h"
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#include "df.h"
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typedef struct ddg_node *ddg_node_ptr;
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typedef struct ddg_edge *ddg_edge_ptr;
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typedef struct ddg *ddg_ptr;
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typedef struct ddg_scc *ddg_scc_ptr;
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typedef struct ddg_all_sccs *ddg_all_sccs_ptr;
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typedef enum {TRUE_DEP, OUTPUT_DEP, ANTI_DEP} dep_type;
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typedef enum {REG_OR_MEM_DEP, REG_DEP, MEM_DEP, REG_AND_MEM_DEP}
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             dep_data_type;
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/* The following two macros enables direct access to the successors and
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   predecessors bitmaps held in each ddg_node.  Do not make changes to
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   these bitmaps, unless you want to change the DDG.  */
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#define NODE_SUCCESSORS(x)  ((x)->successors)
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#define NODE_PREDECESSORS(x)  ((x)->predecessors)
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/* A structure that represents a node in the DDG.  */
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struct ddg_node
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{
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  /* Each node has a unique CUID index.  These indices increase monotonically
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     (according to the order of the corresponding INSN in the BB), starting
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     from 0 with no gaps.  */
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  int cuid;
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  /* The insn represented by the node.  */
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  rtx insn;
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  /* A note preceding INSN (or INSN itself), such that all insns linked
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     from FIRST_NOTE until INSN (inclusive of both) are moved together
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     when reordering the insns.  This takes care of notes that should
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     continue to precede INSN.  */
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  rtx first_note;
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  /* Incoming and outgoing dependency edges.  */
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  ddg_edge_ptr in;
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  ddg_edge_ptr out;
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  /* Each bit corresponds to a ddg_node according to its cuid, and is
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     set iff the node is a successor/predecessor of "this" node.  */
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  sbitmap successors;
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  sbitmap predecessors;
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  /* For general use by algorithms manipulating the ddg.  */
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  union {
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    int count;
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    void *info;
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  } aux;
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};
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/* A structure that represents an edge in the DDG.  */
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struct ddg_edge
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{
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  /* The source and destination nodes of the dependency edge.  */
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  ddg_node_ptr src;
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  ddg_node_ptr dest;
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  /* TRUE, OUTPUT or ANTI dependency.  */
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  dep_type type;
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  /* REG or MEM dependency.  */
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  dep_data_type data_type;
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  /* Latency of the dependency.  */
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  int latency;
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  /* The distance: number of loop iterations the dependency crosses.  */
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  int distance;
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  /* The following two fields are used to form a linked list of the in/out
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     going edges to/from each node.  */
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  ddg_edge_ptr next_in;
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  ddg_edge_ptr next_out;
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  /* For general use by algorithms manipulating the ddg.  */
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  union {
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    int count;
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    void *info;
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  } aux;
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};
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/* This structure holds the Data Dependence Graph for a basic block.  */
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struct ddg
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{
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  /* The basic block for which this DDG is built.  */
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  basic_block bb;
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  /* Number of instructions in the basic block.  */
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  int num_nodes;
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  /* Number of load/store instructions in the BB - statistics.  */
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  int num_loads;
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  int num_stores;
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  /* Number of debug instructions in the BB.  */
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  int num_debug;
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  /* This array holds the nodes in the graph; it is indexed by the node
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     cuid, which follows the order of the instructions in the BB.  */
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  ddg_node_ptr nodes;
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  /* The branch closing the loop.  */
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  ddg_node_ptr closing_branch;
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  /* Build dependence edges for closing_branch, when set.  In certain cases,
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     the closing branch can be dealt with separately from the insns of the
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     loop, and then no such deps are needed.  */
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  int closing_branch_deps;
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  /* Array and number of backarcs (edges with distance > 0) in the DDG.  */
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  int num_backarcs;
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  ddg_edge_ptr *backarcs;
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};
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/* Holds information on an SCC (Strongly Connected Component) of the DDG.  */
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struct ddg_scc
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{
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  /* A bitmap that represents the nodes of the DDG that are in the SCC.  */
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  sbitmap nodes;
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  /* Array and number of backarcs (edges with distance > 0) in the SCC.  */
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  ddg_edge_ptr *backarcs;
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  int num_backarcs;
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  /* The maximum of (total_latency/total_distance) over all cycles in SCC.  */
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  int recurrence_length;
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};
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/* This structure holds the SCCs of the DDG.  */
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struct ddg_all_sccs
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{
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  /* Array that holds the SCCs in the DDG, and their number.  */
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  ddg_scc_ptr *sccs;
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  int num_sccs;
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  ddg_ptr ddg;
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};
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ddg_ptr create_ddg (basic_block, int closing_branch_deps);
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void free_ddg (ddg_ptr);
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void print_ddg (FILE *, ddg_ptr);
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void vcg_print_ddg (FILE *, ddg_ptr);
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void print_ddg_edge (FILE *, ddg_edge_ptr);
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void print_sccs (FILE *, ddg_all_sccs_ptr, ddg_ptr);
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ddg_node_ptr get_node_of_insn (ddg_ptr, rtx);
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void find_successors (sbitmap result, ddg_ptr, sbitmap);
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void find_predecessors (sbitmap result, ddg_ptr, sbitmap);
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ddg_all_sccs_ptr create_ddg_all_sccs (ddg_ptr);
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void free_ddg_all_sccs (ddg_all_sccs_ptr);
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int find_nodes_on_paths (sbitmap result, ddg_ptr, sbitmap from, sbitmap to);
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int longest_simple_path (ddg_ptr, int from, int to, sbitmap via);
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#endif /* GCC_DDG_H */

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