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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [ddg.h] - Rev 304
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/* DDG - Data Dependence Graph - interface. Copyright (C) 2004, 2007 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 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_DDG_H #define GCC_DDG_H /* For sbitmap. */ #include "sbitmap.h" /* For basic_block. */ #include "basic-block.h" /* For struct df. */ #include "df.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 preceding 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 precede 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 dependency. */ 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 */
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