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feeeff5c | 1 | /* Mode switching cleanup pass for the EPIPHANY cpu. |
d1e082c2 | 2 | Copyright (C) 2000-2013 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 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "machmode.h" | |
25 | #include "tm.h" | |
26 | #include "hard-reg-set.h" | |
27 | #include "tm_p.h" | |
28 | #include "vec.h" | |
29 | #include "sbitmap.h" | |
30 | #include "basic-block.h" | |
31 | #include "df.h" | |
32 | #include "rtl.h" | |
33 | #include "insn-config.h" | |
34 | #include "insn-codes.h" | |
35 | #include "emit-rtl.h" | |
36 | #include "recog.h" | |
37 | #include "function.h" | |
38 | #include "insn-attr-common.h" | |
39 | #include "tree-pass.h" | |
40 | ||
41 | /* Clean-up after mode switching: | |
42 | Check for mode setting insns that have FP_MODE_ROUND_UNKNOWN. | |
43 | If only one rounding mode is required, select that one. | |
44 | Else we have to choose one to use in this mode setting insn and | |
45 | insert new mode setting insns on the edges where the other mode | |
46 | becomes unambigous. */ | |
47 | ||
48 | static bool | |
49 | gate_resolve_sw_modes (void) | |
50 | { | |
51 | return optimize; | |
52 | } | |
53 | ||
54 | static unsigned | |
55 | resolve_sw_modes (void) | |
56 | { | |
57 | basic_block bb; | |
58 | rtx insn, src; | |
9771b263 | 59 | vec<basic_block> todo; |
feeeff5c JR |
60 | sbitmap pushed; |
61 | bool need_commit = false; | |
62 | bool finalize_fp_sets = (MACHINE_FUNCTION (cfun)->unknown_mode_sets == 0); | |
63 | ||
9771b263 | 64 | todo.create (last_basic_block); |
feeeff5c | 65 | pushed = sbitmap_alloc (last_basic_block); |
f61e445a | 66 | bitmap_clear (pushed); |
feeeff5c JR |
67 | if (!finalize_fp_sets) |
68 | { | |
69 | df_note_add_problem (); | |
70 | df_analyze (); | |
71 | } | |
72 | FOR_EACH_BB (bb) | |
73 | FOR_BB_INSNS (bb, insn) | |
74 | { | |
75 | enum attr_fp_mode selected_mode; | |
76 | ||
77 | if (!NONJUMP_INSN_P (insn) | |
78 | || recog_memoized (insn) != CODE_FOR_set_fp_mode) | |
79 | continue; | |
80 | src = SET_SRC (XVECEXP (PATTERN (insn), 0, 0)); | |
81 | if (finalize_fp_sets) | |
82 | { | |
83 | SET_SRC (XVECEXP (PATTERN (insn), 0, 2)) = copy_rtx (src); | |
84 | if (REG_P (src)) | |
85 | df_insn_rescan (insn); | |
86 | continue; | |
87 | } | |
88 | if (REG_P (src) | |
89 | || XINT (XVECEXP (XEXP (src, 0), 0, 0), 0) != FP_MODE_ROUND_UNKNOWN) | |
90 | continue; | |
91 | if (find_regno_note (insn, REG_UNUSED, FP_TRUNCATE_REGNUM)) | |
92 | selected_mode = FP_MODE_ROUND_NEAREST; | |
93 | else if (find_regno_note (insn, REG_UNUSED, FP_NEAREST_REGNUM)) | |
94 | selected_mode = FP_MODE_ROUND_TRUNC; | |
95 | else | |
96 | { | |
97 | /* We could get more fancy in the selection of the mode by | |
98 | checking the total frequency of the affected edges. */ | |
99 | selected_mode = (enum attr_fp_mode) epiphany_normal_fp_rounding; | |
100 | ||
9771b263 | 101 | todo.quick_push (bb); |
d7c028c0 | 102 | bitmap_set_bit (pushed, bb->index); |
feeeff5c JR |
103 | } |
104 | XVECEXP (XEXP (src, 0), 0, 0) = GEN_INT (selected_mode); | |
105 | SET_SRC (XVECEXP (PATTERN (insn), 0, 1)) = copy_rtx (src); | |
106 | SET_SRC (XVECEXP (PATTERN (insn), 0, 2)) = copy_rtx (src); | |
107 | df_insn_rescan (insn); | |
108 | } | |
9771b263 | 109 | while (todo.length ()) |
feeeff5c | 110 | { |
9771b263 | 111 | basic_block bb = todo.pop (); |
feeeff5c JR |
112 | int selected_reg, jilted_reg; |
113 | enum attr_fp_mode jilted_mode; | |
114 | edge e; | |
115 | edge_iterator ei; | |
116 | ||
d7c028c0 LC |
117 | bitmap_set_bit (pushed, bb->index); |
118 | bitmap_set_bit (pushed, bb->index); | |
feeeff5c JR |
119 | |
120 | if (epiphany_normal_fp_rounding == FP_MODE_ROUND_NEAREST) | |
121 | { | |
122 | selected_reg = FP_NEAREST_REGNUM; | |
123 | jilted_reg = FP_TRUNCATE_REGNUM; | |
124 | jilted_mode = FP_MODE_ROUND_TRUNC; | |
125 | } | |
126 | else | |
127 | { | |
128 | selected_reg = FP_TRUNCATE_REGNUM; | |
129 | jilted_reg = FP_NEAREST_REGNUM; | |
130 | jilted_mode = FP_MODE_ROUND_NEAREST; | |
131 | } | |
132 | ||
133 | FOR_EACH_EDGE (e, ei, bb->succs) | |
134 | { | |
135 | basic_block succ = e->dest; | |
136 | rtx seq; | |
137 | ||
138 | if (!REGNO_REG_SET_P (DF_LIVE_IN (succ), jilted_reg)) | |
139 | continue; | |
140 | if (REGNO_REG_SET_P (DF_LIVE_IN (succ), selected_reg)) | |
141 | { | |
d7c028c0 | 142 | if (bitmap_bit_p (pushed, succ->index)) |
feeeff5c | 143 | continue; |
9771b263 | 144 | todo.quick_push (succ); |
d7c028c0 | 145 | bitmap_set_bit (pushed, bb->index); |
feeeff5c JR |
146 | continue; |
147 | } | |
148 | start_sequence (); | |
149 | emit_set_fp_mode (EPIPHANY_MSW_ENTITY_ROUND_UNKNOWN, | |
150 | jilted_mode, NULL); | |
151 | seq = get_insns (); | |
152 | end_sequence (); | |
153 | need_commit = true; | |
154 | insert_insn_on_edge (seq, e); | |
155 | } | |
156 | } | |
9771b263 | 157 | todo.release (); |
feeeff5c JR |
158 | sbitmap_free (pushed); |
159 | if (need_commit) | |
160 | commit_edge_insertions (); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | struct rtl_opt_pass pass_resolve_sw_modes = | |
165 | { | |
166 | { | |
167 | RTL_PASS, | |
168 | "resolve_sw_modes", /* name */ | |
53750ab0 | 169 | OPTGROUP_NONE, /* optinfo_flags */ |
feeeff5c JR |
170 | gate_resolve_sw_modes, /* gate */ |
171 | resolve_sw_modes, /* execute */ | |
172 | NULL, /* sub */ | |
173 | NULL, /* next */ | |
174 | 0, /* static_pass_number */ | |
175 | TV_MODE_SWITCH, /* tv_id */ | |
176 | 0, /* properties_required */ | |
177 | 0, /* properties_provided */ | |
178 | 0, /* properties_destroyed */ | |
179 | 0, /* todo_flags_start */ | |
180 | TODO_df_finish | TODO_verify_rtl_sharing | | |
181 | 0 /* todo_flags_finish */ | |
182 | } | |
183 | }; |