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1 | /* Lower and optimize address expressions. | |
2 | Copyright (C) 2015-2017 Free Software Foundation, Inc. | |
3 | Contributed by Marek Polacek <polacek@redhat.com> | |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "alias.h" | |
25 | #include "predict.h" | |
26 | #include "tm.h" | |
27 | #include "function.h" | |
28 | #include "dominance.h" | |
29 | #include "cfg.h" | |
30 | #include "basic-block.h" | |
31 | #include "tree-ssa-alias.h" | |
32 | #include "symtab.h" | |
33 | #include "tree.h" | |
34 | #include "stringpool.h" | |
35 | #include "tree-vrp.h" | |
36 | #include "tree-ssanames.h" | |
37 | #include "fold-const.h" | |
38 | #include "gimple-expr.h" | |
39 | #include "gimple.h" | |
40 | #include "gimplify.h" | |
41 | #include "gimple-iterator.h" | |
42 | #include "gimplify-me.h" | |
43 | #include "tree-pass.h" | |
44 | ||
45 | ||
46 | namespace { | |
47 | ||
48 | const pass_data pass_data_laddress = | |
49 | { | |
50 | GIMPLE_PASS, /* type */ | |
51 | "laddress", /* name */ | |
52 | OPTGROUP_NONE, /* optinfo_flags */ | |
53 | TV_GIMPLE_LADDRESS, /* tv_id */ | |
54 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
55 | 0, /* properties_provided */ | |
56 | 0, /* properties_destroyed */ | |
57 | 0, /* todo_flags_start */ | |
58 | 0, /* todo_flags_finish */ | |
59 | }; | |
60 | ||
61 | class pass_laddress : public gimple_opt_pass | |
62 | { | |
63 | public: | |
64 | pass_laddress (gcc::context *ctxt) | |
65 | : gimple_opt_pass (pass_data_laddress, ctxt) | |
66 | {} | |
67 | ||
68 | /* opt_pass methods: */ | |
69 | opt_pass * clone () { return new pass_laddress (m_ctxt); } | |
70 | virtual bool gate (function *) { return optimize != 0; } | |
71 | virtual unsigned int execute (function *); | |
72 | ||
73 | }; // class pass_laddress | |
74 | ||
75 | unsigned int | |
76 | pass_laddress::execute (function *fun) | |
77 | { | |
78 | basic_block bb; | |
79 | ||
80 | FOR_EACH_BB_FN (bb, fun) | |
81 | { | |
82 | for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);) | |
83 | { | |
84 | gimple *stmt = gsi_stmt (gsi); | |
85 | if (!is_gimple_assign (stmt) | |
86 | || gimple_assign_rhs_code (stmt) != ADDR_EXPR | |
87 | || is_gimple_invariant_address (gimple_assign_rhs1 (stmt))) | |
88 | { | |
89 | gsi_next (&gsi); | |
90 | continue; | |
91 | } | |
92 | ||
93 | /* Lower ADDR_EXPR assignments: | |
94 | _4 = &b[i_9]; | |
95 | into | |
96 | _1 = (sizetype) i_9; | |
97 | _7 = _1 * 4; | |
98 | _4 = &b + _7; | |
99 | This ought to aid the vectorizer and expose CSE opportunities. | |
100 | */ | |
101 | ||
102 | tree expr = gimple_assign_rhs1 (stmt); | |
103 | HOST_WIDE_INT bitsize, bitpos; | |
104 | tree base, offset; | |
105 | machine_mode mode; | |
106 | int volatilep = 0, reversep, unsignedp = 0; | |
107 | base = get_inner_reference (TREE_OPERAND (expr, 0), &bitsize, | |
108 | &bitpos, &offset, &mode, &unsignedp, | |
109 | &reversep, &volatilep); | |
110 | gcc_assert (base != NULL_TREE && (bitpos % BITS_PER_UNIT) == 0); | |
111 | if (offset != NULL_TREE) | |
112 | { | |
113 | if (bitpos != 0) | |
114 | offset = size_binop (PLUS_EXPR, offset, | |
115 | size_int (bitpos / BITS_PER_UNIT)); | |
116 | offset = force_gimple_operand_gsi (&gsi, offset, true, NULL, | |
117 | true, GSI_SAME_STMT); | |
118 | base = build_fold_addr_expr (base); | |
119 | base = force_gimple_operand_gsi (&gsi, base, true, NULL, | |
120 | true, GSI_SAME_STMT); | |
121 | gimple *g = gimple_build_assign (gimple_assign_lhs (stmt), | |
122 | POINTER_PLUS_EXPR, base, offset); | |
123 | gsi_replace (&gsi, g, false); | |
124 | } | |
125 | gsi_next (&gsi); | |
126 | } | |
127 | } | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | } // anon namespace | |
133 | ||
134 | gimple_opt_pass * | |
135 | make_pass_laddress (gcc::context *ctxt) | |
136 | { | |
137 | return new pass_laddress (ctxt); | |
138 | } |