/* Forward propagation of expressions for single use variables.
- Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
This file is part of GCC.
/* If name is not a simple copy destination, we found it. */
if (TREE_CODE (GIMPLE_STMT_OPERAND (def_stmt, 1)) != SSA_NAME)
{
+ tree rhs;
+
if (!single_use_only && single_use_p)
*single_use_p = single_use;
- return def_stmt;
+ /* We can look through pointer conversions in the search
+ for a useful stmt for the comparison folding. */
+ rhs = GIMPLE_STMT_OPERAND (def_stmt, 1);
+ if ((TREE_CODE (rhs) == NOP_EXPR
+ || TREE_CODE (rhs) == CONVERT_EXPR)
+ && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME
+ && POINTER_TYPE_P (TREE_TYPE (rhs))
+ && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (rhs, 0))))
+ name = TREE_OPERAND (rhs, 0);
+ else
+ return def_stmt;
+ }
+ else
+ {
+ /* Continue searching the def of the copy source name. */
+ name = GIMPLE_STMT_OPERAND (def_stmt, 1);
}
-
- /* Continue searching the def of the copy source name. */
- name = GIMPLE_STMT_OPERAND (def_stmt, 1);
} while (1);
}
if (REFERENCE_CLASS_P (rhs))
return false;
+ /* Constants can be always propagated. */
+ if (is_gimple_min_invariant (rhs))
+ return true;
+
/* We cannot propagate ssa names that occur in abnormal phi nodes. */
switch (TREE_CODE_LENGTH (TREE_CODE (rhs)))
{
tree tmp = NULL_TREE;
tree cond = COND_EXPR_COND (cond_expr);
tree name, def_stmt, rhs0 = NULL_TREE, rhs1 = NULL_TREE;
- bool single_use_p;
+ bool single_use0_p = false, single_use1_p = false;
/* We can do tree combining on SSA_NAME and comparison expressions. */
if (COMPARISON_CLASS_P (cond)
/* For comparisons use the first operand, that is likely to
simplify comparisons against constants. */
name = TREE_OPERAND (cond, 0);
- def_stmt = get_prop_source_stmt (name, false, &single_use_p);
+ def_stmt = get_prop_source_stmt (name, false, &single_use0_p);
if (def_stmt != NULL_TREE
&& can_propagate_from (def_stmt))
{
rhs0 = GIMPLE_STMT_OPERAND (def_stmt, 1);
tmp = combine_cond_expr_cond (TREE_CODE (cond), boolean_type_node,
fold_convert (TREE_TYPE (op1), rhs0),
- op1, !single_use_p);
+ op1, !single_use0_p);
}
/* If that wasn't successful, try the second operand. */
if (tmp == NULL_TREE
{
tree op0 = TREE_OPERAND (cond, 0);
name = TREE_OPERAND (cond, 1);
- def_stmt = get_prop_source_stmt (name, false, &single_use_p);
+ def_stmt = get_prop_source_stmt (name, false, &single_use1_p);
if (def_stmt == NULL_TREE
|| !can_propagate_from (def_stmt))
return did_something;
tmp = combine_cond_expr_cond (TREE_CODE (cond), boolean_type_node,
op0,
fold_convert (TREE_TYPE (op0), rhs1),
- !single_use_p);
+ !single_use1_p);
}
/* If that wasn't successful either, try both operands. */
if (tmp == NULL_TREE
tmp = combine_cond_expr_cond (TREE_CODE (cond), boolean_type_node,
rhs0,
fold_convert (TREE_TYPE (rhs0), rhs1),
- !single_use_p);
+ !(single_use0_p && single_use1_p));
}
else if (TREE_CODE (cond) == SSA_NAME)
{
bool single_use_p)
{
tree lhs, rhs, array_ref;
+ tree *rhsp, *lhsp;
- /* Strip away any outer COMPONENT_REF/ARRAY_REF nodes from the LHS.
- ADDR_EXPR will not appear on the LHS. */
- lhs = GIMPLE_STMT_OPERAND (use_stmt, 0);
- while (handled_component_p (lhs))
- lhs = TREE_OPERAND (lhs, 0);
+ gcc_assert (TREE_CODE (def_rhs) == ADDR_EXPR);
+ lhs = GIMPLE_STMT_OPERAND (use_stmt, 0);
rhs = GIMPLE_STMT_OPERAND (use_stmt, 1);
- /* Now see if the LHS node is an INDIRECT_REF using NAME. If so,
- propagate the ADDR_EXPR into the use of NAME and fold the result. */
- if (TREE_CODE (lhs) == INDIRECT_REF && TREE_OPERAND (lhs, 0) == name)
- {
- /* This should always succeed in creating gimple, so there is
- no need to save enough state to undo this propagation. */
- TREE_OPERAND (lhs, 0) = unshare_expr (def_rhs);
- fold_stmt_inplace (use_stmt);
- tidy_after_forward_propagate_addr (use_stmt);
-
- /* Continue propagating into the RHS. */
- }
-
/* Trivial cases. The use statement could be a trivial copy or a
useless conversion. Recurse to the uses of the lhs as copyprop does
- not copy through differen variant pointers and FRE does not catch
+ not copy through different variant pointers and FRE does not catch
all useless conversions. Treat the case of a single-use name and
a conversion to def_rhs type separate, though. */
- else if (TREE_CODE (lhs) == SSA_NAME
- && (TREE_CODE (rhs) == NOP_EXPR
- || TREE_CODE (rhs) == CONVERT_EXPR)
- && TREE_TYPE (rhs) == TREE_TYPE (def_rhs)
- && single_use_p)
+ if (TREE_CODE (lhs) == SSA_NAME
+ && (rhs == name
+ || TREE_CODE (rhs) == NOP_EXPR
+ || TREE_CODE (rhs) == CONVERT_EXPR)
+ && useless_type_conversion_p (TREE_TYPE (rhs), TREE_TYPE (def_rhs)))
{
+ /* Only recurse if we don't deal with a single use. */
+ if (!single_use_p)
+ return forward_propagate_addr_expr (lhs, def_rhs);
+
GIMPLE_STMT_OPERAND (use_stmt, 1) = unshare_expr (def_rhs);
return true;
}
- else if ((TREE_CODE (lhs) == SSA_NAME
- && rhs == name)
- || ((TREE_CODE (rhs) == NOP_EXPR
- || TREE_CODE (rhs) == CONVERT_EXPR)
- && useless_type_conversion_p (TREE_TYPE (rhs),
- TREE_TYPE (def_rhs))))
- return forward_propagate_addr_expr (lhs, def_rhs);
+
+ /* Now strip away any outer COMPONENT_REF/ARRAY_REF nodes from the LHS.
+ ADDR_EXPR will not appear on the LHS. */
+ lhsp = &GIMPLE_STMT_OPERAND (use_stmt, 0);
+ while (handled_component_p (*lhsp))
+ lhsp = &TREE_OPERAND (*lhsp, 0);
+ lhs = *lhsp;
+
+ /* Now see if the LHS node is an INDIRECT_REF using NAME. If so,
+ propagate the ADDR_EXPR into the use of NAME and fold the result. */
+ if (TREE_CODE (lhs) == INDIRECT_REF
+ && TREE_OPERAND (lhs, 0) == name
+ && useless_type_conversion_p (TREE_TYPE (TREE_OPERAND (lhs, 0)),
+ TREE_TYPE (def_rhs))
+ /* ??? This looks redundant, but is required for bogus types
+ that can sometimes occur. */
+ && useless_type_conversion_p (TREE_TYPE (lhs),
+ TREE_TYPE (TREE_OPERAND (def_rhs, 0))))
+ {
+ *lhsp = unshare_expr (TREE_OPERAND (def_rhs, 0));
+ fold_stmt_inplace (use_stmt);
+ tidy_after_forward_propagate_addr (use_stmt);
+
+ /* Continue propagating into the RHS if this was not the only use. */
+ if (single_use_p)
+ return true;
+ }
/* Strip away any outer COMPONENT_REF, ARRAY_REF or ADDR_EXPR
nodes from the RHS. */
- while (handled_component_p (rhs)
- || TREE_CODE (rhs) == ADDR_EXPR)
- rhs = TREE_OPERAND (rhs, 0);
+ rhsp = &GIMPLE_STMT_OPERAND (use_stmt, 1);
+ while (handled_component_p (*rhsp)
+ || TREE_CODE (*rhsp) == ADDR_EXPR)
+ rhsp = &TREE_OPERAND (*rhsp, 0);
+ rhs = *rhsp;
/* Now see if the RHS node is an INDIRECT_REF using NAME. If so,
propagate the ADDR_EXPR into the use of NAME and fold the result. */
- if (TREE_CODE (rhs) == INDIRECT_REF && TREE_OPERAND (rhs, 0) == name)
+ if (TREE_CODE (rhs) == INDIRECT_REF
+ && TREE_OPERAND (rhs, 0) == name
+ && useless_type_conversion_p (TREE_TYPE (TREE_OPERAND (rhs, 0)),
+ TREE_TYPE (def_rhs))
+ /* ??? This looks redundant, but is required for bogus types
+ that can sometimes occur. */
+ && useless_type_conversion_p (TREE_TYPE (rhs),
+ TREE_TYPE (TREE_OPERAND (def_rhs, 0))))
{
- /* This should always succeed in creating gimple, so there is
- no need to save enough state to undo this propagation. */
- TREE_OPERAND (rhs, 0) = unshare_expr (def_rhs);
+ *rhsp = unshare_expr (TREE_OPERAND (def_rhs, 0));
fold_stmt_inplace (use_stmt);
tidy_after_forward_propagate_addr (use_stmt);
return true;
}
+ /* If the use of the ADDR_EXPR is not a POINTER_PLUS_EXPR, there
+ is nothing to do. */
+ if (TREE_CODE (rhs) != POINTER_PLUS_EXPR
+ || TREE_OPERAND (rhs, 0) != name)
+ return false;
+
/* The remaining cases are all for turning pointer arithmetic into
array indexing. They only apply when we have the address of
element zero in an array. If that is not the case then there
|| !integer_zerop (TREE_OPERAND (array_ref, 1)))
return false;
- /* If the use of the ADDR_EXPR is not a POINTER_PLUS_EXPR, there
- is nothing to do. */
- if (TREE_CODE (rhs) != POINTER_PLUS_EXPR)
- return false;
-
/* Try to optimize &x[0] p+ C where C is a multiple of the size
of the elements in X into &x[C/element size]. */
- if (TREE_OPERAND (rhs, 0) == name
- && TREE_CODE (TREE_OPERAND (rhs, 1)) == INTEGER_CST)
+ if (TREE_CODE (TREE_OPERAND (rhs, 1)) == INTEGER_CST)
{
tree orig = unshare_expr (rhs);
TREE_OPERAND (rhs, 0) = unshare_expr (def_rhs);
converting a multiplication of an index by the size of the
array elements, then the result is converted into the proper
type for the arithmetic. */
- if (TREE_OPERAND (rhs, 0) == name
- && TREE_CODE (TREE_OPERAND (rhs, 1)) == SSA_NAME
+ if (TREE_CODE (TREE_OPERAND (rhs, 1)) == SSA_NAME
/* Avoid problems with IVopts creating PLUS_EXPRs with a
different type than their operands. */
&& useless_type_conversion_p (TREE_TYPE (rhs), TREE_TYPE (name)))
FOR_EACH_IMM_USE_STMT (use_stmt, iter, name)
{
bool result;
+ tree use_rhs;
/* If the use is not in a simple assignment statement, then
there is nothing we can do. */
pop_stmt_changes (&use_stmt);
/* Remove intermediate now unused copy and conversion chains. */
+ use_rhs = GIMPLE_STMT_OPERAND (use_stmt, 1);
if (result
&& TREE_CODE (GIMPLE_STMT_OPERAND (use_stmt, 0)) == SSA_NAME
- && (TREE_CODE (GIMPLE_STMT_OPERAND (use_stmt, 1)) == SSA_NAME
- || TREE_CODE (GIMPLE_STMT_OPERAND (use_stmt, 1)) == NOP_EXPR
- || TREE_CODE (GIMPLE_STMT_OPERAND (use_stmt, 1)) == CONVERT_EXPR))
+ && (TREE_CODE (use_rhs) == SSA_NAME
+ || ((TREE_CODE (use_rhs) == NOP_EXPR
+ || TREE_CODE (use_rhs) == CONVERT_EXPR)
+ && TREE_CODE (TREE_OPERAND (use_rhs, 0)) == SSA_NAME)))
{
block_stmt_iterator bsi = bsi_for_stmt (use_stmt);
release_defs (use_stmt);
continue;
}
- if (TREE_CODE (rhs) == ADDR_EXPR)
+ if (TREE_CODE (rhs) == ADDR_EXPR
+ /* Handle pointer conversions on invariant addresses
+ as well, as this is valid gimple. */
+ || ((TREE_CODE (rhs) == NOP_EXPR
+ || TREE_CODE (rhs) == CONVERT_EXPR)
+ && TREE_CODE (TREE_OPERAND (rhs, 0)) == ADDR_EXPR
+ && POINTER_TYPE_P (TREE_TYPE (rhs))))
{
- if (forward_propagate_addr_expr (lhs, rhs))
+ STRIP_NOPS (rhs);
+ if (!stmt_references_abnormal_ssa_name (stmt)
+ && forward_propagate_addr_expr (lhs, rhs))
{
release_defs (stmt);
todoflags |= TODO_remove_unused_locals;
return 1;
}
-struct tree_opt_pass pass_forwprop = {
+struct gimple_opt_pass pass_forwprop =
+{
+ {
+ GIMPLE_PASS,
"forwprop", /* name */
gate_forwprop, /* gate */
tree_ssa_forward_propagate_single_use_vars, /* execute */
TODO_dump_func
| TODO_ggc_collect
| TODO_update_ssa
- | TODO_verify_ssa, /* todo_flags_finish */
- 0 /* letter */
+ | TODO_verify_ssa /* todo_flags_finish */
+ }
};
-
-/* Structure to keep track of the value of a dereferenced PHI result
- and the set of virtual operands used for that dereference. */
-
-struct phiprop_d
-{
- tree value;
- tree vop_stmt;
-};
-
-/* Verify if the value recorded for NAME in PHIVN is still valid at
- the start of basic block BB. */
-
-static bool
-phivn_valid_p (struct phiprop_d *phivn, tree name, basic_block bb)
-{
- tree vop_stmt = phivn[SSA_NAME_VERSION (name)].vop_stmt;
- ssa_op_iter ui;
- tree vuse;
-
- /* The def stmts of all virtual uses need to be post-dominated
- by bb. */
- FOR_EACH_SSA_TREE_OPERAND (vuse, vop_stmt, ui, SSA_OP_VUSE)
- {
- tree use_stmt;
- imm_use_iterator ui2;
- bool ok = true;
-
- FOR_EACH_IMM_USE_STMT (use_stmt, ui2, vuse)
- {
- /* If BB does not dominate a VDEF, the value is invalid. */
- if (((TREE_CODE (use_stmt) == GIMPLE_MODIFY_STMT
- && !ZERO_SSA_OPERANDS (use_stmt, SSA_OP_VDEF))
- || TREE_CODE (use_stmt) == PHI_NODE)
- && !dominated_by_p (CDI_DOMINATORS, bb_for_stmt (use_stmt), bb))
- {
- ok = false;
- BREAK_FROM_IMM_USE_STMT (ui2);
- }
- }
- if (!ok)
- return false;
- }
-
- return true;
-}
-
-/* Insert a new phi node for the dereference of PHI at basic_block
- BB with the virtual operands from USE_STMT. */
-
-static tree
-phiprop_insert_phi (basic_block bb, tree phi, tree use_stmt,
- struct phiprop_d *phivn, size_t n)
-{
- tree res, new_phi;
- edge_iterator ei;
- edge e;
-
- /* Build a new PHI node to replace the definition of
- the indirect reference lhs. */
- res = GIMPLE_STMT_OPERAND (use_stmt, 0);
- SSA_NAME_DEF_STMT (res) = new_phi = create_phi_node (res, bb);
-
- /* Add PHI arguments for each edge inserting loads of the
- addressable operands. */
- FOR_EACH_EDGE (e, ei, bb->preds)
- {
- tree old_arg, new_var, tmp;
-
- old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e);
- while (TREE_CODE (old_arg) == SSA_NAME
- && (SSA_NAME_VERSION (old_arg) >= n
- || phivn[SSA_NAME_VERSION (old_arg)].value == NULL_TREE))
- {
- tree def_stmt = SSA_NAME_DEF_STMT (old_arg);
- old_arg = GIMPLE_STMT_OPERAND (def_stmt, 1);
- }
-
- if (TREE_CODE (old_arg) == SSA_NAME)
- /* Reuse a formerly created dereference. */
- new_var = phivn[SSA_NAME_VERSION (old_arg)].value;
- else
- {
- old_arg = TREE_OPERAND (old_arg, 0);
- new_var = create_tmp_var (TREE_TYPE (old_arg), NULL);
- tmp = build2 (GIMPLE_MODIFY_STMT, void_type_node,
- NULL_TREE, unshare_expr (old_arg));
- if (TREE_CODE (TREE_TYPE (old_arg)) == COMPLEX_TYPE
- || TREE_CODE (TREE_TYPE (old_arg)) == VECTOR_TYPE)
- DECL_GIMPLE_REG_P (new_var) = 1;
- add_referenced_var (new_var);
- new_var = make_ssa_name (new_var, tmp);
- GIMPLE_STMT_OPERAND (tmp, 0) = new_var;
-
- bsi_insert_on_edge (e, tmp);
-
- update_stmt (tmp);
- mark_symbols_for_renaming (tmp);
- }
-
- add_phi_arg (new_phi, new_var, e);
- }
-
- update_stmt (new_phi);
-
- return res;
-}
-
-/* Propagate between the phi node arguments of PHI in BB and phi result
- users. For now this matches
- # p_2 = PHI <&x, &y>
- <Lx>:;
- p_3 = p_2;
- z_2 = *p_3;
- and converts it to
- # z_2 = PHI <x, y>
- <Lx>:;
- Returns true if a transformation was done and edge insertions
- need to be committed. Global data PHIVN and N is used to track
- past transformation results. We need to be especially careful here
- with aliasing issues as we are moving memory reads. */
-
-static bool
-propagate_with_phi (basic_block bb, tree phi, struct phiprop_d *phivn, size_t n)
-{
- tree ptr = PHI_RESULT (phi);
- tree use_stmt, res = NULL_TREE;
- block_stmt_iterator bsi;
- imm_use_iterator ui;
- use_operand_p arg_p, use;
- ssa_op_iter i;
- bool phi_inserted;
-
- if (MTAG_P (SSA_NAME_VAR (ptr))
- || !POINTER_TYPE_P (TREE_TYPE (ptr))
- || !is_gimple_reg_type (TREE_TYPE (TREE_TYPE (ptr))))
- return false;
-
- /* Check if we can "cheaply" dereference all phi arguments. */
- FOR_EACH_PHI_ARG (arg_p, phi, i, SSA_OP_USE)
- {
- tree arg = USE_FROM_PTR (arg_p);
- /* Walk the ssa chain until we reach a ssa name we already
- created a value for or we reach a definition of the form
- ssa_name_n = &var; */
- while (TREE_CODE (arg) == SSA_NAME
- && !SSA_NAME_IS_DEFAULT_DEF (arg)
- && (SSA_NAME_VERSION (arg) >= n
- || phivn[SSA_NAME_VERSION (arg)].value == NULL_TREE))
- {
- tree def_stmt = SSA_NAME_DEF_STMT (arg);
- if (TREE_CODE (def_stmt) != GIMPLE_MODIFY_STMT)
- return false;
- arg = GIMPLE_STMT_OPERAND (def_stmt, 1);
- }
- if ((TREE_CODE (arg) != ADDR_EXPR
- /* Avoid to have to decay *&a to a[0] later. */
- || !is_gimple_reg_type (TREE_TYPE (TREE_OPERAND (arg, 0))))
- && !(TREE_CODE (arg) == SSA_NAME
- && phivn[SSA_NAME_VERSION (arg)].value != NULL_TREE
- && phivn_valid_p (phivn, arg, bb)))
- return false;
- }
-
- /* Find a dereferencing use. First follow (single use) ssa
- copy chains for ptr. */
- while (single_imm_use (ptr, &use, &use_stmt)
- && TREE_CODE (use_stmt) == GIMPLE_MODIFY_STMT
- && GIMPLE_STMT_OPERAND (use_stmt, 1) == ptr
- && TREE_CODE (GIMPLE_STMT_OPERAND (use_stmt, 0)) == SSA_NAME)
- ptr = GIMPLE_STMT_OPERAND (use_stmt, 0);
-
- /* Replace the first dereference of *ptr if there is one and if we
- can move the loads to the place of the ptr phi node. */
- phi_inserted = false;
- FOR_EACH_IMM_USE_STMT (use_stmt, ui, ptr)
- {
- ssa_op_iter ui2;
- tree vuse;
-
- /* Check whether this is a load of *ptr. */
- if (!(TREE_CODE (use_stmt) == GIMPLE_MODIFY_STMT
- && TREE_CODE (GIMPLE_STMT_OPERAND (use_stmt, 0)) == SSA_NAME
- && TREE_CODE (GIMPLE_STMT_OPERAND (use_stmt, 1)) == INDIRECT_REF
- && TREE_OPERAND (GIMPLE_STMT_OPERAND (use_stmt, 1), 0) == ptr
- /* We cannot replace a load that may throw or is volatile. */
- && !tree_can_throw_internal (use_stmt)))
- continue;
-
- /* Check if we can move the loads. The def stmts of all virtual uses
- need to be post-dominated by bb. */
- FOR_EACH_SSA_TREE_OPERAND (vuse, use_stmt, ui2, SSA_OP_VUSE)
- {
- tree def_stmt = SSA_NAME_DEF_STMT (vuse);
- if (!SSA_NAME_IS_DEFAULT_DEF (vuse)
- && (bb_for_stmt (def_stmt) == bb
- || !dominated_by_p (CDI_DOMINATORS,
- bb, bb_for_stmt (def_stmt))))
- goto next;
- }
-
- /* Found a proper dereference. Insert a phi node if this
- is the first load transformation. */
- if (!phi_inserted)
- {
- res = phiprop_insert_phi (bb, phi, use_stmt, phivn, n);
-
- /* Remember the value we created for *ptr. */
- phivn[SSA_NAME_VERSION (ptr)].value = res;
- phivn[SSA_NAME_VERSION (ptr)].vop_stmt = use_stmt;
-
- /* Remove old stmt. The phi is taken care of by DCE, if we
- want to delete it here we also have to delete all intermediate
- copies. */
- bsi = bsi_for_stmt (use_stmt);
- bsi_remove (&bsi, 0);
-
- phi_inserted = true;
- }
- else
- {
- /* Further replacements are easy, just make a copy out of the
- load. */
- GIMPLE_STMT_OPERAND (use_stmt, 1) = res;
- update_stmt (use_stmt);
- }
-
-next:;
- /* Continue searching for a proper dereference. */
- }
-
- return phi_inserted;
-}
-
-/* Helper walking the dominator tree starting from BB and processing
- phi nodes with global data PHIVN and N. */
-
-static bool
-tree_ssa_phiprop_1 (basic_block bb, struct phiprop_d *phivn, size_t n)
-{
- bool did_something = false;
- basic_block son;
- tree phi;
-
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
- did_something |= propagate_with_phi (bb, phi, phivn, n);
-
- for (son = first_dom_son (CDI_DOMINATORS, bb);
- son;
- son = next_dom_son (CDI_DOMINATORS, son))
- did_something |= tree_ssa_phiprop_1 (son, phivn, n);
-
- return did_something;
-}
-
-/* Main entry for phiprop pass. */
-
-static unsigned int
-tree_ssa_phiprop (void)
-{
- struct phiprop_d *phivn;
-
- calculate_dominance_info (CDI_DOMINATORS);
-
- phivn = XCNEWVEC (struct phiprop_d, num_ssa_names);
-
- if (tree_ssa_phiprop_1 (ENTRY_BLOCK_PTR, phivn, num_ssa_names))
- bsi_commit_edge_inserts ();
-
- free (phivn);
-
- return 0;
-}
-
-static bool
-gate_phiprop (void)
-{
- return 1;
-}
-
-struct tree_opt_pass pass_phiprop = {
- "phiprop", /* name */
- gate_phiprop, /* gate */
- tree_ssa_phiprop, /* execute */
- NULL, /* sub */
- NULL, /* next */
- 0, /* static_pass_number */
- TV_TREE_FORWPROP, /* tv_id */
- PROP_cfg | PROP_ssa, /* properties_required */
- 0, /* properties_provided */
- 0, /* properties_destroyed */
- 0, /* todo_flags_start */
- TODO_dump_func
- | TODO_ggc_collect
- | TODO_update_ssa
- | TODO_verify_ssa, /* todo_flags_finish */
- 0 /* letter */
-};
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