diff options
| author | Diego Novillo <dnovillo@redhat.com> | 2004-08-29 06:16:02 +0000 |
|---|---|---|
| committer | Diego Novillo <dnovillo@gcc.gnu.org> | 2004-08-29 02:16:02 -0400 |
| commit | 750628d8bcdda3394d81f0b16d0703bb7deeb849 (patch) | |
| tree | 7614a76a2ddfc4ba7fe4532833225adde4aeb47d /gcc/tree-ssa-propagate.h | |
| parent | f108270b88db1ada07dbc81727577b97b312bcb3 (diff) | |
| download | gcc-750628d8bcdda3394d81f0b16d0703bb7deeb849.tar.gz | |
Makefile.in (OBJS-common): Add tree-ssa-propagate.o
* Makefile.in (OBJS-common): Add tree-ssa-propagate.o
(tree-ssa-propagate.o): New rule.
(GTFILES): Add tree-ssa-propagate.c.
* tree-flow.h (struct stmt_ann_d): Remove field
in_ccp_worklist.
* tree-ssa-propagate.c: New file.
* tree-ssa-propagate.h: New file.
* tree-ssa-ccp.c: Re-write to use the routines from
tree-ssa-propagate.c.
From-SVN: r86711
Diffstat (limited to 'gcc/tree-ssa-propagate.h')
| -rw-r--r-- | gcc/tree-ssa-propagate.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/gcc/tree-ssa-propagate.h b/gcc/tree-ssa-propagate.h new file mode 100644 index 00000000000..d390176937a --- /dev/null +++ b/gcc/tree-ssa-propagate.h @@ -0,0 +1,62 @@ +/* Data structures and function declarations for the SSA value propagation + engine. + Copyright (C) 2001, 2003, 2004 Free Software Foundation, Inc. + Contributed by Diego Novillo <dnovillo@redhat.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 _TREE_SSA_PROPAGATE_H +#define _TREE_SSA_PROPAGATE_H 1 + +/* Use the TREE_VISITED bitflag to mark statements and PHI nodes that + have been deemed varying and should not be simulated again. */ +#define DONT_SIMULATE_AGAIN(T) TREE_VISITED (T) + +/* Lattice values used for propagation purposes. Specific instances + of a propagation engine must return these values from the statement + and PHI visit functions to direct the engine. */ + +enum ssa_prop_result { + /* The statement produces nothing of interest. No edges will be + added to the work lists. */ + SSA_PROP_NOT_INTERESTING, + + /* The statement produces an interesting value. The set SSA_NAMEs + returned by SSA_PROP_VISIT_STMT should be added to + INTERESTING_SSA_EDGES. If the statement being visited is a + conditional jump, SSA_PROP_VISIT_STMT should indicate which edge + out of the basic block should be marked exectuable. */ + SSA_PROP_INTERESTING, + + /* The statement produces a varying (i.e., useless) value and + should not be simulated again. If the statement being visited + is a conditional jump, all the edges coming out of the block + will be considered executable. */ + SSA_PROP_VARYING +}; + + +/* Call-back functions used by the value propagation engine. */ +typedef enum ssa_prop_result (*ssa_prop_visit_stmt_fn) (tree, edge *, tree *); +typedef enum ssa_prop_result (*ssa_prop_visit_phi_fn) (tree); + +void ssa_propagate (ssa_prop_visit_stmt_fn, ssa_prop_visit_phi_fn); +tree get_rhs (tree); +bool set_rhs (tree *, tree); + +#endif /* _TREE_SSA_PROPAGATE_H */ |