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annotate gcc/sese.h @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Single entry single exit control flow regions.
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2 Copyright (C) 2008-2020 Free Software Foundation, Inc.
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3 Contributed by Jan Sjodin <jan.sjodin@amd.com> and
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4 Sebastian Pop <sebastian.pop@amd.com>.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #ifndef GCC_SESE_H
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23 #define GCC_SESE_H
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24
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25 typedef struct ifsese_s *ifsese;
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26
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27 /* A Single Entry, Single Exit region is a part of the CFG delimited
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28 by two edges. */
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29 class sese_l
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30 {
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31 public:
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32 sese_l (edge e, edge x) : entry (e), exit (x) {}
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33
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34 operator bool () const { return entry && exit; }
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35
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36 edge entry;
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37 edge exit;
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38 };
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39
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40 void print_edge (FILE *file, const_edge e);
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41 void print_sese (FILE *file, const sese_l &s);
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42 void dump_edge (const_edge e);
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43 void dump_sese (const sese_l &);
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44
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45 /* Get the entry of an sese S. */
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46
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47 static inline basic_block
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48 get_entry_bb (sese_l &s)
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49 {
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50 return s.entry->dest;
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51 }
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52
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53 /* Get the exit of an sese S. */
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54
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55 static inline basic_block
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56 get_exit_bb (sese_l &s)
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57 {
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58 return s.exit->src;
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59 }
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60
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61 /* Returns the index of V where ELEM can be found. -1 Otherwise. */
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62 template<typename T>
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63 int
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64 vec_find (const vec<T> &v, const T &elem)
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65 {
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66 int i;
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67 T t;
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68 FOR_EACH_VEC_ELT (v, i, t)
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69 if (elem == t)
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70 return i;
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71 return -1;
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72 }
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73
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74 /* A helper structure for bookkeeping information about a scop in graphite. */
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75 typedef class sese_info_t
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76 {
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77 public:
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78 /* The SESE region. */
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79 sese_l region;
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80
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81 /* Liveout vars. */
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82 bitmap liveout;
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83
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84 /* Liveout in debug stmts. */
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85 bitmap debug_liveout;
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86
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87 /* Parameters used within the SCOP. */
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88 vec<tree> params;
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89
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90 /* Maps an old name to a new decl. */
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91 hash_map<tree, tree> *rename_map;
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92
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93 /* Basic blocks contained in this SESE. */
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94 vec<basic_block> bbs;
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95
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96 /* The condition region generated for this sese. */
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97 ifsese if_region;
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98
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99 } *sese_info_p;
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100
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101 extern sese_info_p new_sese_info (edge, edge);
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102 extern void free_sese_info (sese_info_p);
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103 extern void sese_insert_phis_for_liveouts (sese_info_p, basic_block, edge, edge);
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104 extern class loop *outermost_loop_in_sese (sese_l &, basic_block);
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105 extern tree scalar_evolution_in_region (const sese_l &, loop_p, tree);
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106 extern bool scev_analyzable_p (tree, sese_l &);
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107 extern bool invariant_in_sese_p_rec (tree, const sese_l &, bool *);
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108 extern void sese_build_liveouts (sese_info_p);
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109 extern bool sese_trivially_empty_bb_p (basic_block);
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110
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111 /* The number of parameters in REGION. */
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112
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113 static inline unsigned
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114 sese_nb_params (sese_info_p region)
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115 {
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116 return region->params.length ();
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117 }
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118
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119 /* Checks whether BB is contained in the region delimited by ENTRY and
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120 EXIT blocks. */
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121
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122 static inline bool
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123 bb_in_region (const_basic_block bb, const_basic_block entry, const_basic_block exit)
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124 {
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125 return dominated_by_p (CDI_DOMINATORS, bb, entry)
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126 && !(dominated_by_p (CDI_DOMINATORS, bb, exit)
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127 && !dominated_by_p (CDI_DOMINATORS, entry, exit));
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128 }
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129
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130 /* Checks whether BB is contained in the region delimited by ENTRY and
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131 EXIT blocks. */
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132
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133 static inline bool
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134 bb_in_sese_p (basic_block bb, const sese_l &r)
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135 {
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136 return bb_in_region (bb, r.entry->dest, r.exit->dest);
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137 }
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138
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139 /* Returns true when STMT is defined in REGION. */
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140
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141 static inline bool
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142 stmt_in_sese_p (gimple *stmt, const sese_l &r)
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143 {
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144 basic_block bb = gimple_bb (stmt);
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145 return bb && bb_in_sese_p (bb, r);
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146 }
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147
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148 /* Returns true when NAME is defined in REGION. */
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149
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150 static inline bool
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151 defined_in_sese_p (tree name, const sese_l &r)
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152 {
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153 return stmt_in_sese_p (SSA_NAME_DEF_STMT (name), r);
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154 }
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155
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156 /* Returns true when LOOP is in REGION. */
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157
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158 static inline bool
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159 loop_in_sese_p (class loop *loop, const sese_l &region)
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160 {
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161 return (bb_in_sese_p (loop->header, region)
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162 && bb_in_sese_p (loop->latch, region));
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163 }
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164
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165 /* Returns the loop depth of LOOP in REGION. The loop depth
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166 is the same as the normal loop depth, but limited by a region.
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167
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168 Example:
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169
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170 loop_0
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171 loop_1
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172 {
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173 S0
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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174 <- region start
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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175 S1
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parents:
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176
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 loop_2
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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178 S2
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parents:
diff changeset
179
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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180 S3
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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181 <- region end
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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182 }
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183
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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184 loop_0 does not exist in the region -> invalid
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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185 loop_1 exists, but is not completely contained in the region -> depth 0
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186 loop_2 is completely contained -> depth 1 */
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187
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188 static inline unsigned int
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diff changeset
189 sese_loop_depth (const sese_l &region, loop_p loop)
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190 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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191 unsigned int depth = 0;
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192
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193 while (loop_in_sese_p (loop, region))
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194 {
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195 depth++;
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196 loop = loop_outer (loop);
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197 }
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198
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199 return depth;
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200 }
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201
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202 /* A single entry single exit specialized for conditions. */
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203
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204 typedef struct ifsese_s {
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205 sese_info_p region;
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206 sese_info_p true_region;
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207 sese_info_p false_region;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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208 } *ifsese;
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209
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210 extern ifsese move_sese_in_condition (sese_info_p);
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211 extern void set_ifsese_condition (ifsese, tree);
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212 extern edge get_true_edge_from_guard_bb (basic_block);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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213 extern edge get_false_edge_from_guard_bb (basic_block);
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214
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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215 static inline edge
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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216 if_region_entry (ifsese if_region)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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217 {
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218 return if_region->region->region.entry;
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219 }
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220
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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221 static inline edge
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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222 if_region_exit (ifsese if_region)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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223 {
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224 return if_region->region->region.exit;
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225 }
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parents:
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226
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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227 static inline basic_block
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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228 if_region_get_condition_block (ifsese if_region)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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229 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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230 return if_region_entry (if_region)->dest;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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231 }
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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232
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233 typedef std::pair <gimple *, tree> scalar_use;
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234
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235 typedef struct gimple_poly_bb
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236 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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237 basic_block bb;
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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238 struct poly_bb *pbb;
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239
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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240 /* Lists containing the restrictions of the conditional statements
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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241 dominating this bb. This bb can only be executed, if all conditions
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 are true.
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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243
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 Example:
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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245
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 for (i = 0; i <= 20; i++)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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247 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 A
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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249
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 if (2i <= 8)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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251 B
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 }
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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253
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 So for B there is an additional condition (2i <= 8).
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parents:
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255
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 List of COND_EXPR and SWITCH_EXPR. A COND_EXPR is true only if the
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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257 corresponding element in CONDITION_CASES is not NULL_TREE. For a
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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258 SWITCH_EXPR the corresponding element in CONDITION_CASES is a
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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259 CASE_LABEL_EXPR. */
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260 vec<gimple *> conditions;
kono
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261 vec<gimple *> condition_cases;
kono
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262 vec<data_reference_p> data_refs;
kono
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263 vec<scalar_use> read_scalar_refs;
kono
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264 vec<tree> write_scalar_refs;
kono
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265 } *gimple_poly_bb_p;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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266
67
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 63
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267 #define GBB_BB(GBB) (GBB)->bb
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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268 #define GBB_PBB(GBB) (GBB)->pbb
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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269 #define GBB_DATA_REFS(GBB) (GBB)->data_refs
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff changeset
270 #define GBB_CONDITIONS(GBB) (GBB)->conditions
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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271 #define GBB_CONDITION_CASES(GBB) (GBB)->condition_cases
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272
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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273 /* Return the innermost loop that contains the basic block GBB. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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274
145
1830386684a0 gcc-9.2.0
anatofuz
parents: 131
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275 static inline class loop *
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276 gbb_loop (gimple_poly_bb_p gbb)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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277 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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278 return GBB_BB (gbb)->loop_father;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
279 }
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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280
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
281 /* Returns the gimple loop, that corresponds to the loop_iterator_INDEX.
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
282 If there is no corresponding gimple loop, we return NULL. */
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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283
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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284 static inline loop_p
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285 gbb_loop_at_index (gimple_poly_bb_p gbb, sese_l &region, int index)
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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286 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
287 loop_p loop = gbb_loop (gbb);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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288 int depth = sese_loop_depth (region, loop);
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289
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
290 while (--depth > index)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
291 loop = loop_outer (loop);
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292
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diff changeset
293 gcc_assert (loop_in_sese_p (loop, region));
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294
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
295 return loop;
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
296 }
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297
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
298 /* The number of common loops in REGION for GBB1 and GBB2. */
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diff changeset
299
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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300 static inline int
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diff changeset
301 nb_common_loops (sese_l &region, gimple_poly_bb_p gbb1, gimple_poly_bb_p gbb2)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
302 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
303 loop_p l1 = gbb_loop (gbb1);
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diff changeset
304 loop_p l2 = gbb_loop (gbb2);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
305 loop_p common = find_common_loop (l1, l2);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
306
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
307 return sese_loop_depth (region, common);
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
308 }
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
309
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff changeset
310 #endif