| /* DDG - Data Dependence Graph - interface. |
| Copyright (C) 2004-2017 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. */ |
| |
| 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; |
| |
| enum dep_type {TRUE_DEP, OUTPUT_DEP, ANTI_DEP}; |
| enum dep_data_type {REG_OR_MEM_DEP, REG_DEP, MEM_DEP, REG_AND_MEM_DEP}; |
| |
| /* 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 *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_insn *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; |
| |
| /* Number of debug instructions in the BB. */ |
| int num_debug; |
| |
| /* 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. */ |
| int num_backarcs; |
| ddg_edge_ptr *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, 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); |
| void print_sccs (FILE *, ddg_all_sccs_ptr, ddg_ptr); |
| |
| ddg_node_ptr get_node_of_insn (ddg_ptr, rtx_insn *); |
| |
| 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); |
| |
| bool autoinc_var_is_used_p (rtx_insn *, rtx_insn *); |
| |
| #endif /* GCC_DDG_H */ |