comparison gcc/init-regs.c @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 77e2b8dfacca
children 84e7813d76e9
comparison
equal deleted inserted replaced
15:561a7518be6b 16:04ced10e8804
1 /* Initialization of uninitialized regs. 1 /* Initialization of uninitialized regs.
2 Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc. 2 Copyright (C) 2007-2017 Free Software Foundation, Inc.
3 3
4 This file is part of GCC. 4 This file is part of GCC.
5 5
6 GCC is free software; you can redistribute it and/or modify it under 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 7 the terms of the GNU General Public License as published by the Free
18 <http://www.gnu.org/licenses/>. */ 18 <http://www.gnu.org/licenses/>. */
19 19
20 #include "config.h" 20 #include "config.h"
21 #include "system.h" 21 #include "system.h"
22 #include "coretypes.h" 22 #include "coretypes.h"
23 #include "tm.h" 23 #include "backend.h"
24 #include "rtl.h"
24 #include "tree.h" 25 #include "tree.h"
25 #include "rtl.h" 26 #include "df.h"
26 #include "regs.h" 27 #include "memmodel.h"
28 #include "emit-rtl.h"
27 #include "expr.h" 29 #include "expr.h"
28 #include "tree-pass.h" 30 #include "tree-pass.h"
29 #include "basic-block.h"
30 #include "flags.h"
31 #include "df.h"
32 31
33 /* Check all of the uses of pseudo variables. If any use that is MUST 32 /* Check all of the uses of pseudo variables. If any use that is MUST
34 uninitialized, add a store of 0 immediately before it. For 33 uninitialized, add a store of 0 immediately before it. For
35 subregs, this makes combine happy. For full word regs, this makes 34 subregs, this makes combine happy. For full word regs, this makes
36 other optimizations, like the register allocator and the reg-stack 35 other optimizations, like the register allocator and the reg-stack
47 46
48 static void 47 static void
49 initialize_uninitialized_regs (void) 48 initialize_uninitialized_regs (void)
50 { 49 {
51 basic_block bb; 50 basic_block bb;
52 bitmap already_genned = BITMAP_ALLOC (NULL); 51 auto_bitmap already_genned;
53 52
54 if (optimize == 1) 53 if (optimize == 1)
55 { 54 {
56 df_live_add_problem (); 55 df_live_add_problem ();
57 df_live_set_all_dirty (); 56 df_live_set_all_dirty ();
58 } 57 }
59 58
60 df_analyze (); 59 df_analyze ();
61 60
62 FOR_EACH_BB (bb) 61 FOR_EACH_BB_FN (bb, cfun)
63 { 62 {
64 rtx insn; 63 rtx_insn *insn;
65 bitmap lr = DF_LR_IN (bb); 64 bitmap lr = DF_LR_IN (bb);
66 bitmap ur = DF_LIVE_IN (bb); 65 bitmap ur = DF_LIVE_IN (bb);
67 bitmap_clear (already_genned); 66 bitmap_clear (already_genned);
68 67
69 FOR_BB_INSNS (bb, insn) 68 FOR_BB_INSNS (bb, insn)
70 { 69 {
71 unsigned int uid = INSN_UID (insn); 70 df_ref use;
72 df_ref *use_rec;
73 if (!NONDEBUG_INSN_P (insn)) 71 if (!NONDEBUG_INSN_P (insn))
74 continue; 72 continue;
75 73
76 for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++) 74 FOR_EACH_INSN_USE (use, insn)
77 { 75 {
78 df_ref use = *use_rec;
79 unsigned int regno = DF_REF_REGNO (use); 76 unsigned int regno = DF_REF_REGNO (use);
80 77
81 /* Only do this for the pseudos. */ 78 /* Only do this for the pseudos. */
82 if (regno < FIRST_PSEUDO_REGISTER) 79 if (regno < FIRST_PSEUDO_REGISTER)
80 continue;
81
82 /* Ignore pseudo PIC register. */
83 if (pic_offset_table_rtx
84 && regno == REGNO (pic_offset_table_rtx))
83 continue; 85 continue;
84 86
85 /* Do not generate multiple moves for the same regno. 87 /* Do not generate multiple moves for the same regno.
86 This is common for sequences of subreg operations. 88 This is common for sequences of subreg operations.
87 They would be deleted during combine but there is no 89 They would be deleted during combine but there is no
94 and no def for it reaches the top of the block from 96 and no def for it reaches the top of the block from
95 outside of the block (the ur test). */ 97 outside of the block (the ur test). */
96 if (bitmap_bit_p (lr, regno) 98 if (bitmap_bit_p (lr, regno)
97 && (!bitmap_bit_p (ur, regno))) 99 && (!bitmap_bit_p (ur, regno)))
98 { 100 {
99 rtx move_insn; 101 rtx_insn *move_insn;
100 rtx reg = DF_REF_REAL_REG (use); 102 rtx reg = DF_REF_REAL_REG (use);
101 103
102 bitmap_set_bit (already_genned, regno); 104 bitmap_set_bit (already_genned, regno);
103 105
104 start_sequence (); 106 start_sequence ();
107 emit_clobber (reg);
105 emit_move_insn (reg, CONST0_RTX (GET_MODE (reg))); 108 emit_move_insn (reg, CONST0_RTX (GET_MODE (reg)));
106 move_insn = get_insns (); 109 move_insn = get_insns ();
107 end_sequence (); 110 end_sequence ();
108 emit_insn_before (move_insn, insn); 111 emit_insn_before (move_insn, insn);
109 if (dump_file) 112 if (dump_file)
110 fprintf (dump_file, 113 fprintf (dump_file,
111 "adding initialization in %s of reg %d at in block %d for insn %d.\n", 114 "adding initialization in %s of reg %d at in block %d for insn %d.\n",
112 current_function_name (), regno, bb->index, uid); 115 current_function_name (), regno, bb->index,
116 INSN_UID (insn));
113 } 117 }
114 } 118 }
115 } 119 }
116 } 120 }
117 121
119 { 123 {
120 if (dump_file) 124 if (dump_file)
121 df_dump (dump_file); 125 df_dump (dump_file);
122 df_remove_problem (df_live); 126 df_remove_problem (df_live);
123 } 127 }
124
125 BITMAP_FREE (already_genned);
126 } 128 }
127 129
128 static bool 130 namespace {
129 gate_initialize_regs (void) 131
132 const pass_data pass_data_initialize_regs =
130 { 133 {
131 return optimize > 0; 134 RTL_PASS, /* type */
135 "init-regs", /* name */
136 OPTGROUP_NONE, /* optinfo_flags */
137 TV_NONE, /* tv_id */
138 0, /* properties_required */
139 0, /* properties_provided */
140 0, /* properties_destroyed */
141 0, /* todo_flags_start */
142 TODO_df_finish, /* todo_flags_finish */
143 };
144
145 class pass_initialize_regs : public rtl_opt_pass
146 {
147 public:
148 pass_initialize_regs (gcc::context *ctxt)
149 : rtl_opt_pass (pass_data_initialize_regs, ctxt)
150 {}
151
152 /* opt_pass methods: */
153 virtual bool gate (function *) { return optimize > 0; }
154 virtual unsigned int execute (function *)
155 {
156 initialize_uninitialized_regs ();
157 return 0;
158 }
159
160 }; // class pass_initialize_regs
161
162 } // anon namespace
163
164 rtl_opt_pass *
165 make_pass_initialize_regs (gcc::context *ctxt)
166 {
167 return new pass_initialize_regs (ctxt);
132 } 168 }
133
134 static unsigned int
135 rest_of_handle_initialize_regs (void)
136 {
137 initialize_uninitialized_regs ();
138 return 0;
139 }
140
141 struct rtl_opt_pass pass_initialize_regs =
142 {
143 {
144 RTL_PASS,
145 "init-regs", /* name */
146 gate_initialize_regs, /* gate */
147 rest_of_handle_initialize_regs, /* execute */
148 NULL, /* sub */
149 NULL, /* next */
150 0, /* static_pass_number */
151 TV_NONE, /* tv_id */
152 0, /* properties_required */
153 0, /* properties_provided */
154 0, /* properties_destroyed */
155 0, /* todo_flags_start */
156 TODO_dump_func |
157 TODO_df_finish /* todo_flags_finish */
158 }
159 };