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Because the aliases were treated as live, every alias of a temp resulted in an assignment, which proved to be quite significant (4-5 assignments in some simple GA expressions). By using an alias node in the dag, the unaliased temp can be marked live while the alias is treated as an operation rather than an operand. Now my GA expressions have no superfluous assignments (generally no assignments at all).
119 lines
4 KiB
C
119 lines
4 KiB
C
/*
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dags.h
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DAG representation of basic blocks
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Copyright (C) 2012 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2012/05/08
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License 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 this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef dags_h
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#define dags_h
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/** \defgroup qfcc_dags DAG building
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\ingroup qfcc
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*/
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///@{
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#include "QF/progs/pr_comp.h"
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#include "statements.h"
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struct dstring_s;
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struct flownode_s;
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typedef struct daglabel_s {
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struct daglabel_s *next;
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struct daglabel_s *daglabel_chain; ///< all labels created for a dag
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int number; ///< index into array of labels in dag_t
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unsigned live:1; ///< accessed via an alias FIXME redundant?
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const char *opcode; ///< not if op
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struct operand_s *op; ///< not if opcode;
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struct dagnode_s *dagnode; ///< node with which this label is associated
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struct expr_s *expr; ///< expression associated with this label
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} daglabel_t;
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typedef struct dagnode_s {
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struct dagnode_s *next;
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int number; ///< index into array of nodes in dag_t
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int topo; ///< topological sort order
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struct set_s *parents; ///< empty if root node
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int cost; ///< cost of this node in temp vars
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struct dagnode_s *killed; ///< node is unavailable for cse (by node)
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st_type_t type; ///< type of node (st_none = leaf)
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daglabel_t *label; ///< ident/const if leaf node, or operator
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struct type_s *tl;
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struct operand_s *value; ///< operand holding the value of this node
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/// \name child nodes
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/// if \a children[0] is null, the rest must be null as well. Similar for
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/// \a children[1].
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///
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/// \a edges is the set of all nodes upon which this node depends. ie,
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/// they must be evaluated before this node is evaluted. So while nodes
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/// in \a edges may not be true children of this node, they are effective
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/// children in the DAG. That is, \a edges is for producing a correct
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/// topological sort of the DAG.
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//@{
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struct dagnode_s *children[3];
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struct type_s *types[3]; ///< desired type of each operand (to alias)
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struct set_s *edges; ///< includes nodes pointed to by \a children
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int offset; ///< for alias nodes
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//@}
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struct set_s *identifiers; ///< set of identifiers attached to this node
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struct set_s *reachable; ///< set of nodes reachable via edges (not
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///< parents) for ensuring cycles are not
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///< created
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} dagnode_t;
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typedef struct dag_s {
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struct dag_s *next;
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dagnode_t **nodes; ///< array of all dagnodes in this dag
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int num_nodes;
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int *topo; ///< nodes in topological sort order
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int num_topo; ///< number of nodes in topo (may be <
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///< num_nodes after dead node removal)
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daglabel_t **labels; ///< array of all daglabels in this dag
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int num_labels;
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struct set_s *roots; ///< set of root nodes
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struct flownode_s *flownode;///< flow node this dag represents
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} dag_t;
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const char *daglabel_string (daglabel_t *label);
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void print_dag (struct dstring_s *dstr, dag_t *dag, const char *label);
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void dot_dump_dag (void *_dag, const char *filename);
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/** Make a dag for a single basic block.
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\param flownode The flow graph node representing the basic block for which
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the dag will be created. The node should have its live
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variable information already computed.
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\return The dag representing the basic block.
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*/
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dag_t *dag_create (struct flownode_s *flownode);
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void dag_remove_dead_nodes (dag_t *dag);
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void dag_generate (dag_t *dag, sblock_t *block);
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///@}
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#endif//dags_h
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