]>
Commit | Line | Data |
---|---|---|
feeeff5c | 1 | /* Mode switching cleanup pass for the EPIPHANY cpu. |
8d9254fc | 2 | Copyright (C) 2000-2020 Free Software Foundation, Inc. |
feeeff5c JR |
3 | Contributed by Embecosm on behalf of Adapteva, Inc. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License 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 | ||
8fcc61f8 RS |
21 | #define IN_TARGET_CODE 1 |
22 | ||
feeeff5c JR |
23 | #include "config.h" |
24 | #include "system.h" | |
25 | #include "coretypes.h" | |
c7131fb2 AM |
26 | #include "backend.h" |
27 | #include "rtl.h" | |
28 | #include "df.h" | |
4d0cdd0c | 29 | #include "memmodel.h" |
feeeff5c | 30 | #include "tm_p.h" |
feeeff5c | 31 | #include "insn-config.h" |
feeeff5c JR |
32 | #include "emit-rtl.h" |
33 | #include "recog.h" | |
e11c4407 | 34 | #include "cfgrtl.h" |
feeeff5c JR |
35 | #include "insn-attr-common.h" |
36 | #include "tree-pass.h" | |
37 | ||
be55bfe6 TS |
38 | namespace { |
39 | ||
40 | const pass_data pass_data_resolve_sw_modes = | |
41 | { | |
42 | RTL_PASS, /* type */ | |
43 | "resolve_sw_modes", /* name */ | |
44 | OPTGROUP_NONE, /* optinfo_flags */ | |
be55bfe6 TS |
45 | TV_MODE_SWITCH, /* tv_id */ |
46 | 0, /* properties_required */ | |
47 | 0, /* properties_provided */ | |
48 | 0, /* properties_destroyed */ | |
49 | 0, /* todo_flags_start */ | |
3bea341f | 50 | TODO_df_finish, /* todo_flags_finish */ |
be55bfe6 TS |
51 | }; |
52 | ||
53 | class pass_resolve_sw_modes : public rtl_opt_pass | |
54 | { | |
55 | public: | |
56 | pass_resolve_sw_modes(gcc::context *ctxt) | |
57 | : rtl_opt_pass(pass_data_resolve_sw_modes, ctxt) | |
58 | {} | |
59 | ||
60 | /* opt_pass methods: */ | |
61 | virtual bool gate (function *) { return optimize; } | |
62 | virtual unsigned int execute (function *); | |
63 | ||
64 | }; // class pass_resolve_sw_modes | |
65 | ||
feeeff5c JR |
66 | /* Clean-up after mode switching: |
67 | Check for mode setting insns that have FP_MODE_ROUND_UNKNOWN. | |
68 | If only one rounding mode is required, select that one. | |
69 | Else we have to choose one to use in this mode setting insn and | |
70 | insert new mode setting insns on the edges where the other mode | |
71 | becomes unambigous. */ | |
72 | ||
be55bfe6 TS |
73 | unsigned |
74 | pass_resolve_sw_modes::execute (function *fun) | |
feeeff5c JR |
75 | { |
76 | basic_block bb; | |
bcfba653 DM |
77 | rtx_insn *insn; |
78 | rtx src; | |
9771b263 | 79 | vec<basic_block> todo; |
feeeff5c JR |
80 | sbitmap pushed; |
81 | bool need_commit = false; | |
82 | bool finalize_fp_sets = (MACHINE_FUNCTION (cfun)->unknown_mode_sets == 0); | |
83 | ||
be55bfe6 TS |
84 | todo.create (last_basic_block_for_fn (fun)); |
85 | pushed = sbitmap_alloc (last_basic_block_for_fn (fun)); | |
f61e445a | 86 | bitmap_clear (pushed); |
feeeff5c JR |
87 | if (!finalize_fp_sets) |
88 | { | |
89 | df_note_add_problem (); | |
90 | df_analyze (); | |
91 | } | |
be55bfe6 | 92 | FOR_EACH_BB_FN (bb, fun) |
feeeff5c JR |
93 | FOR_BB_INSNS (bb, insn) |
94 | { | |
95 | enum attr_fp_mode selected_mode; | |
96 | ||
97 | if (!NONJUMP_INSN_P (insn) | |
98 | || recog_memoized (insn) != CODE_FOR_set_fp_mode) | |
99 | continue; | |
100 | src = SET_SRC (XVECEXP (PATTERN (insn), 0, 0)); | |
101 | if (finalize_fp_sets) | |
102 | { | |
103 | SET_SRC (XVECEXP (PATTERN (insn), 0, 2)) = copy_rtx (src); | |
104 | if (REG_P (src)) | |
105 | df_insn_rescan (insn); | |
106 | continue; | |
107 | } | |
108 | if (REG_P (src) | |
109 | || XINT (XVECEXP (XEXP (src, 0), 0, 0), 0) != FP_MODE_ROUND_UNKNOWN) | |
110 | continue; | |
111 | if (find_regno_note (insn, REG_UNUSED, FP_TRUNCATE_REGNUM)) | |
112 | selected_mode = FP_MODE_ROUND_NEAREST; | |
113 | else if (find_regno_note (insn, REG_UNUSED, FP_NEAREST_REGNUM)) | |
114 | selected_mode = FP_MODE_ROUND_TRUNC; | |
115 | else | |
116 | { | |
117 | /* We could get more fancy in the selection of the mode by | |
118 | checking the total frequency of the affected edges. */ | |
119 | selected_mode = (enum attr_fp_mode) epiphany_normal_fp_rounding; | |
120 | ||
9771b263 | 121 | todo.quick_push (bb); |
d7c028c0 | 122 | bitmap_set_bit (pushed, bb->index); |
feeeff5c JR |
123 | } |
124 | XVECEXP (XEXP (src, 0), 0, 0) = GEN_INT (selected_mode); | |
125 | SET_SRC (XVECEXP (PATTERN (insn), 0, 1)) = copy_rtx (src); | |
126 | SET_SRC (XVECEXP (PATTERN (insn), 0, 2)) = copy_rtx (src); | |
127 | df_insn_rescan (insn); | |
128 | } | |
9771b263 | 129 | while (todo.length ()) |
feeeff5c | 130 | { |
9771b263 | 131 | basic_block bb = todo.pop (); |
feeeff5c JR |
132 | int selected_reg, jilted_reg; |
133 | enum attr_fp_mode jilted_mode; | |
134 | edge e; | |
135 | edge_iterator ei; | |
136 | ||
d7c028c0 LC |
137 | bitmap_set_bit (pushed, bb->index); |
138 | bitmap_set_bit (pushed, bb->index); | |
feeeff5c JR |
139 | |
140 | if (epiphany_normal_fp_rounding == FP_MODE_ROUND_NEAREST) | |
141 | { | |
142 | selected_reg = FP_NEAREST_REGNUM; | |
143 | jilted_reg = FP_TRUNCATE_REGNUM; | |
144 | jilted_mode = FP_MODE_ROUND_TRUNC; | |
145 | } | |
146 | else | |
147 | { | |
148 | selected_reg = FP_TRUNCATE_REGNUM; | |
149 | jilted_reg = FP_NEAREST_REGNUM; | |
150 | jilted_mode = FP_MODE_ROUND_NEAREST; | |
151 | } | |
152 | ||
153 | FOR_EACH_EDGE (e, ei, bb->succs) | |
154 | { | |
155 | basic_block succ = e->dest; | |
bcfba653 | 156 | rtx_insn *seq; |
feeeff5c JR |
157 | |
158 | if (!REGNO_REG_SET_P (DF_LIVE_IN (succ), jilted_reg)) | |
159 | continue; | |
160 | if (REGNO_REG_SET_P (DF_LIVE_IN (succ), selected_reg)) | |
161 | { | |
d7c028c0 | 162 | if (bitmap_bit_p (pushed, succ->index)) |
feeeff5c | 163 | continue; |
9771b263 | 164 | todo.quick_push (succ); |
d7c028c0 | 165 | bitmap_set_bit (pushed, bb->index); |
feeeff5c JR |
166 | continue; |
167 | } | |
168 | start_sequence (); | |
169 | emit_set_fp_mode (EPIPHANY_MSW_ENTITY_ROUND_UNKNOWN, | |
504279ae RS |
170 | jilted_mode, FP_MODE_NONE, |
171 | reg_class_contents[NO_REGS]); | |
feeeff5c JR |
172 | seq = get_insns (); |
173 | end_sequence (); | |
174 | need_commit = true; | |
175 | insert_insn_on_edge (seq, e); | |
176 | } | |
177 | } | |
9771b263 | 178 | todo.release (); |
feeeff5c JR |
179 | sbitmap_free (pushed); |
180 | if (need_commit) | |
181 | commit_edge_insertions (); | |
182 | return 0; | |
183 | } | |
184 | ||
27a4cd48 DM |
185 | } // anon namespace |
186 | ||
187 | rtl_opt_pass * | |
188 | make_pass_resolve_sw_modes (gcc::context *ctxt) | |
189 | { | |
190 | return new pass_resolve_sw_modes (ctxt); | |
191 | } |