1 /* Header file for PHI node routines
2 Copyright (C) 2013-2022 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 #ifndef GCC_TREE_PHINODES_H
21 #define GCC_TREE_PHINODES_H
23 extern void phinodes_print_statistics (void);
24 extern void reserve_phi_args_for_new_edge (basic_block);
25 extern void add_phi_node_to_bb (gphi *phi, basic_block bb);
26 extern gphi *create_phi_node (tree, basic_block);
27 extern void add_phi_arg (gphi *, tree, edge, location_t);
28 extern void remove_phi_args (edge);
29 extern void remove_phi_node (gimple_stmt_iterator *, bool);
30 extern void remove_phi_nodes (basic_block);
31 extern tree degenerate_phi_result (gphi *);
32 extern void set_phi_nodes (basic_block, gimple_seq);
34 static inline use_operand_p
35 gimple_phi_arg_imm_use_ptr (gimple *gs, int i)
37 return &gimple_phi_arg (gs, i)->imm_use;
40 /* Return the phi argument which contains the specified use. */
43 phi_arg_index_from_use (use_operand_p use)
45 struct phi_arg_d *element, *root;
49 /* Since the use is the first thing in a PHI argument element, we can
50 calculate its index based on casting it to an argument, and performing
51 pointer arithmetic. */
55 element = (struct phi_arg_d *)use;
56 root = gimple_phi_arg (phi, 0);
57 index = element - root;
59 /* Make sure the calculation doesn't have any leftover bytes. If it does,
60 then imm_use is likely not the first element in phi_arg_d. */
61 gcc_checking_assert ((((char *)element - (char *)root)
62 % sizeof (struct phi_arg_d)) == 0
63 && index < gimple_phi_capacity (phi));
68 #endif /* GCC_TREE_PHINODES_H */