/* Tree SCC value numbering
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dberlin@dberlin.org>
This file is part of GCC.
#ifndef TREE_SSA_SCCVN_H
#define TREE_SSA_SCCVN_H
+/* In tree-ssa-sccvn.c */
+bool expressions_equal_p (tree, tree);
+
+
/* TOP of the VN lattice. */
extern tree VN_TOP;
-typedef struct vn_ssa_aux
+/* N-ary operations in the hashtable consist of length operands, an
+ opcode, and a type. Result is the value number of the operation,
+ and hashcode is stored to avoid having to calculate it
+ repeatedly. */
+
+typedef struct vn_nary_op_s
{
- /* SCC information. */
- unsigned int dfsnum;
- bool visited;
- unsigned int low;
- bool on_sccstack;
+ /* Unique identify that all expressions with the same value have. */
+ unsigned int value_id;
+ ENUM_BITFIELD(tree_code) opcode : 16;
+ unsigned length : 16;
+ hashval_t hashcode;
+ tree result;
+ tree type;
+ tree op[1];
+} *vn_nary_op_t;
+typedef const struct vn_nary_op_s *const_vn_nary_op_t;
+
+/* Return the size of a vn_nary_op_t with LENGTH operands. */
+
+static inline size_t
+sizeof_vn_nary_op (unsigned int length)
+{
+ return sizeof (struct vn_nary_op_s) + sizeof (tree) * (length - 1);
+}
+
+/* Phi nodes in the hashtable consist of their non-VN_TOP phi
+ arguments, and the basic block the phi is in. Result is the value
+ number of the operation, and hashcode is stored to avoid having to
+ calculate it repeatedly. Phi nodes not in the same block are never
+ considered equivalent. */
+typedef struct vn_phi_s
+{
+ /* Unique identifier that all expressions with the same value have. */
+ unsigned int value_id;
+ hashval_t hashcode;
+ VEC (tree, heap) *phiargs;
+ basic_block block;
+ tree result;
+} *vn_phi_t;
+typedef const struct vn_phi_s *const_vn_phi_t;
+
+/* Reference operands only exist in reference operations structures.
+ They consist of an opcode, type, and some number of operands. For
+ a given opcode, some, all, or none of the operands may be used.
+ The operands are there to store the information that makes up the
+ portion of the addressing calculation that opcode performs. */
+
+typedef struct vn_reference_op_struct
+{
+ enum tree_code opcode;
+ /* Constant offset this op adds or -1 if it is variable. */
+ HOST_WIDE_INT off;
+ tree type;
+ tree op0;
+ tree op1;
+ tree op2;
+} vn_reference_op_s;
+typedef vn_reference_op_s *vn_reference_op_t;
+typedef const vn_reference_op_s *const_vn_reference_op_t;
+
+DEF_VEC_O(vn_reference_op_s);
+DEF_VEC_ALLOC_O(vn_reference_op_s, heap);
+
+/* A reference operation in the hashtable is representation as
+ the vuse, representing the memory state at the time of
+ the operation, and a collection of operands that make up the
+ addressing calculation. If two vn_reference_t's have the same set
+ of operands, they access the same memory location. We also store
+ the resulting value number, and the hashcode. */
+
+typedef struct vn_reference_s
+{
+ /* Unique identifier that all expressions with the same value have. */
+ unsigned int value_id;
+ hashval_t hashcode;
+ tree vuse;
+ alias_set_type set;
+ tree type;
+ VEC (vn_reference_op_s, heap) *operands;
+ tree result;
+} *vn_reference_t;
+typedef const struct vn_reference_s *const_vn_reference_t;
+
+typedef struct vn_constant_s
+{
+ unsigned int value_id;
+ hashval_t hashcode;
+ tree constant;
+} *vn_constant_t;
+
+/* Hash the constant CONSTANT with distinguishing type incompatible
+ constants in the types_compatible_p sense. */
+
+static inline hashval_t
+vn_hash_constant_with_type (tree constant)
+{
+ tree type = TREE_TYPE (constant);
+ return (iterative_hash_expr (constant, 0)
+ + INTEGRAL_TYPE_P (type)
+ + (INTEGRAL_TYPE_P (type)
+ ? TYPE_PRECISION (type) + TYPE_UNSIGNED (type) : 0));
+}
+
+/* Compare the constants C1 and C2 with distinguishing type incompatible
+ constants in the types_compatible_p sense. */
+
+static inline bool
+vn_constant_eq_with_type (tree c1, tree c2)
+{
+ return (expressions_equal_p (c1, c2)
+ && types_compatible_p (TREE_TYPE (c1), TREE_TYPE (c2)));
+}
+
+typedef struct vn_ssa_aux
+{
/* Value number. This may be an SSA name or a constant. */
tree valnum;
/* Representative expression, if not a direct constant. */
tree expr;
+
+ /* Unique identifier that all expressions with the same value have. */
+ unsigned int value_id;
+
+ /* SCC information. */
+ unsigned int dfsnum;
+ unsigned int low;
+ unsigned visited : 1;
+ unsigned on_sccstack : 1;
+
/* Whether the representative expression contains constants. */
- bool has_constants;
+ unsigned has_constants : 1;
/* Whether the SSA_NAME has been value numbered already. This is
only saying whether visit_use has been called on it at least
once. It cannot be used to avoid visitation for SSA_NAME's
involved in non-singleton SCC's. */
- bool use_processed;
+ unsigned use_processed : 1;
+
+ /* Whether the SSA_NAME has no defining statement and thus an
+ insertion of such with EXPR as definition is required before
+ a use can be created of it. */
+ unsigned needs_insertion : 1;
} *vn_ssa_aux_t;
+typedef enum { VN_NOWALK, VN_WALK, VN_WALKREWRITE } vn_lookup_kind;
+
/* Return the value numbering info for an SSA_NAME. */
extern vn_ssa_aux_t VN_INFO (tree);
extern vn_ssa_aux_t VN_INFO_GET (tree);
-bool run_scc_vn (void);
+tree vn_get_expr_for (tree);
+bool run_scc_vn (vn_lookup_kind);
void free_scc_vn (void);
-void switch_to_PRE_table (void);
-tree vn_binary_op_lookup (tree);
-void vn_binary_op_insert (tree, tree);
-tree vn_unary_op_lookup (tree);
-void vn_unary_op_insert (tree, tree);
-tree vn_reference_lookup (tree, VEC (tree, gc) *);
-void vn_reference_insert (tree, tree, VEC (tree, gc) *);
-VEC (tree, gc) *shared_vuses_from_stmt (tree);
-VEC (tree, gc) *copy_vuses_from_stmt (tree);
+tree vn_nary_op_lookup (tree, vn_nary_op_t *);
+tree vn_nary_op_lookup_stmt (gimple, vn_nary_op_t *);
+tree vn_nary_op_lookup_pieces (unsigned int, enum tree_code,
+ tree, tree *, vn_nary_op_t *);
+vn_nary_op_t vn_nary_op_insert (tree, tree);
+vn_nary_op_t vn_nary_op_insert_stmt (gimple, tree);
+vn_nary_op_t vn_nary_op_insert_pieces (unsigned int, enum tree_code,
+ tree, tree *, tree, unsigned int);
+void vn_reference_fold_indirect (VEC (vn_reference_op_s, heap) **,
+ unsigned int *);
+void copy_reference_ops_from_ref (tree, VEC(vn_reference_op_s, heap) **);
+void copy_reference_ops_from_call (gimple, VEC(vn_reference_op_s, heap) **);
+bool ao_ref_init_from_vn_reference (ao_ref *, alias_set_type, tree,
+ VEC (vn_reference_op_s, heap) *);
+tree vn_reference_lookup_pieces (tree, alias_set_type, tree,
+ VEC (vn_reference_op_s, heap) *,
+ vn_reference_t *, vn_lookup_kind);
+tree vn_reference_lookup (tree, tree, vn_lookup_kind, vn_reference_t *);
+vn_reference_t vn_reference_insert (tree, tree, tree);
+vn_reference_t vn_reference_insert_pieces (tree, alias_set_type, tree,
+ VEC (vn_reference_op_s, heap) *,
+ tree, unsigned int);
+
+hashval_t vn_nary_op_compute_hash (const vn_nary_op_t);
+int vn_nary_op_eq (const void *, const void *);
+bool vn_nary_may_trap (vn_nary_op_t);
+hashval_t vn_reference_compute_hash (const vn_reference_t);
+int vn_reference_eq (const void *, const void *);
+unsigned int get_max_value_id (void);
+unsigned int get_next_value_id (void);
+unsigned int get_constant_value_id (tree);
+unsigned int get_or_alloc_constant_value_id (tree);
+bool value_id_constant_p (unsigned int);
+tree fully_constant_vn_reference_p (vn_reference_t);
+/* Valueize NAME if it is an SSA name, otherwise just return it. */
+
+static inline tree
+vn_valueize (tree name)
+{
+ if (TREE_CODE (name) == SSA_NAME)
+ {
+ tree tem = VN_INFO (name)->valnum;
+ return tem == VN_TOP ? name : tem;
+ }
+ return name;
+}
#endif /* TREE_SSA_SCCVN_H */
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