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annotate gcc/sese.h @ 138:fc828634a951

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Thu, 08 Nov 2018 14:17:14 +0900
parents 84e7813d76e9
children 1830386684a0
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1 /* Single entry single exit control flow regions.
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2 Copyright (C) 2008-2018 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 struct sese_l
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30 {
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31 sese_l (edge e, edge x) : entry (e), exit (x) {}
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32
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33 operator bool () const { return entry && exit; }
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34
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35 edge entry;
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36 edge exit;
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37 };
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38
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39 void print_edge (FILE *file, const_edge e);
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40 void print_sese (FILE *file, const sese_l &s);
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41 void dump_edge (const_edge e);
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42 void dump_sese (const sese_l &);
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43
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44 /* Get the entry of an sese S. */
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45
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46 static inline basic_block
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47 get_entry_bb (sese_l &s)
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48 {
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49 return s.entry->dest;
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50 }
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51
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52 /* Get the exit of an sese S. */
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53
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54 static inline basic_block
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55 get_exit_bb (sese_l &s)
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56 {
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57 return s.exit->src;
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58 }
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59
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60 /* Returns the index of V where ELEM can be found. -1 Otherwise. */
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61 template<typename T>
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62 int
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63 vec_find (const vec<T> &v, const T &elem)
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64 {
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65 int i;
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66 T t;
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67 FOR_EACH_VEC_ELT (v, i, t)
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68 if (elem == t)
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69 return i;
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70 return -1;
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71 }
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72
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73 /* A helper structure for bookkeeping information about a scop in graphite. */
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74 typedef struct sese_info_t
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75 {
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76 /* The SESE region. */
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77 sese_l region;
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78
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79 /* Liveout vars. */
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80 bitmap liveout;
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81
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82 /* Liveout in debug stmts. */
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83 bitmap debug_liveout;
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84
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85 /* Parameters used within the SCOP. */
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86 vec<tree> params;
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87
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88 /* Maps an old name to a new decl. */
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89 hash_map<tree, tree> *rename_map;
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90
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91 /* Basic blocks contained in this SESE. */
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92 vec<basic_block> bbs;
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93
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94 /* The condition region generated for this sese. */
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95 ifsese if_region;
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96
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97 } *sese_info_p;
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98
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99 extern sese_info_p new_sese_info (edge, edge);
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100 extern void free_sese_info (sese_info_p);
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101 extern void sese_insert_phis_for_liveouts (sese_info_p, basic_block, edge, edge);
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102 extern struct loop *outermost_loop_in_sese (sese_l &, basic_block);
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103 extern tree scalar_evolution_in_region (const sese_l &, loop_p, tree);
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104 extern bool scev_analyzable_p (tree, sese_l &);
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105 extern bool invariant_in_sese_p_rec (tree, const sese_l &, bool *);
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106 extern void sese_build_liveouts (sese_info_p);
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107 extern bool sese_trivially_empty_bb_p (basic_block);
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108
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109 /* The number of parameters in REGION. */
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110
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111 static inline unsigned
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112 sese_nb_params (sese_info_p region)
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113 {
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114 return region->params.length ();
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115 }
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116
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117 /* Checks whether BB is contained in the region delimited by ENTRY and
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118 EXIT blocks. */
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119
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120 static inline bool
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121 bb_in_region (const_basic_block bb, const_basic_block entry, const_basic_block exit)
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122 {
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123 return dominated_by_p (CDI_DOMINATORS, bb, entry)
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124 && !(dominated_by_p (CDI_DOMINATORS, bb, exit)
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125 && !dominated_by_p (CDI_DOMINATORS, entry, exit));
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126 }
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127
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128 /* Checks whether BB is contained in the region delimited by ENTRY and
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129 EXIT blocks. */
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130
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131 static inline bool
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132 bb_in_sese_p (basic_block bb, const sese_l &r)
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133 {
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134 return bb_in_region (bb, r.entry->dest, r.exit->dest);
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135 }
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136
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137 /* Returns true when STMT is defined in REGION. */
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138
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139 static inline bool
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140 stmt_in_sese_p (gimple *stmt, const sese_l &r)
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141 {
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142 basic_block bb = gimple_bb (stmt);
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143 return bb && bb_in_sese_p (bb, r);
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144 }
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145
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146 /* Returns true when NAME is defined in REGION. */
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147
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148 static inline bool
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149 defined_in_sese_p (tree name, const sese_l &r)
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150 {
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151 return stmt_in_sese_p (SSA_NAME_DEF_STMT (name), r);
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152 }
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153
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154 /* Returns true when LOOP is in REGION. */
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155
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156 static inline bool
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157 loop_in_sese_p (struct loop *loop, const sese_l &region)
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158 {
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159 return (bb_in_sese_p (loop->header, region)
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160 && bb_in_sese_p (loop->latch, region));
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161 }
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162
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163 /* Returns the loop depth of LOOP in REGION. The loop depth
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164 is the same as the normal loop depth, but limited by a region.
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165
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166 Example:
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167
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168 loop_0
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169 loop_1
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170 {
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171 S0
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172 <- region start
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173 S1
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174
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175 loop_2
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176 S2
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177
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178 S3
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179 <- region end
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180 }
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181
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182 loop_0 does not exist in the region -> invalid
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183 loop_1 exists, but is not completely contained in the region -> depth 0
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184 loop_2 is completely contained -> depth 1 */
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185
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186 static inline unsigned int
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187 sese_loop_depth (const sese_l &region, loop_p loop)
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188 {
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189 unsigned int depth = 0;
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190
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191 while (loop_in_sese_p (loop, region))
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192 {
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193 depth++;
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194 loop = loop_outer (loop);
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195 }
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196
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197 return depth;
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198 }
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199
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200 /* A single entry single exit specialized for conditions. */
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201
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202 typedef struct ifsese_s {
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203 sese_info_p region;
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204 sese_info_p true_region;
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205 sese_info_p false_region;
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206 } *ifsese;
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207
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208 extern ifsese move_sese_in_condition (sese_info_p);
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209 extern void set_ifsese_condition (ifsese, tree);
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210 extern edge get_true_edge_from_guard_bb (basic_block);
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211 extern edge get_false_edge_from_guard_bb (basic_block);
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212
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213 static inline edge
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214 if_region_entry (ifsese if_region)
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215 {
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216 return if_region->region->region.entry;
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217 }
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218
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219 static inline edge
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220 if_region_exit (ifsese if_region)
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221 {
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222 return if_region->region->region.exit;
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223 }
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224
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225 static inline basic_block
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226 if_region_get_condition_block (ifsese if_region)
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227 {
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228 return if_region_entry (if_region)->dest;
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229 }
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230
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231 typedef std::pair <gimple *, tree> scalar_use;
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232
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233 typedef struct gimple_poly_bb
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234 {
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235 basic_block bb;
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236 struct poly_bb *pbb;
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237
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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238 /* Lists containing the restrictions of the conditional statements
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239 dominating this bb. This bb can only be executed, if all conditions
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240 are true.
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241
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diff changeset
242 Example:
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243
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244 for (i = 0; i <= 20; i++)
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245 {
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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246 A
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247
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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248 if (2i <= 8)
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249 B
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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250 }
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251
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252 So for B there is an additional condition (2i <= 8).
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253
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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254 List of COND_EXPR and SWITCH_EXPR. A COND_EXPR is true only if the
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255 corresponding element in CONDITION_CASES is not NULL_TREE. For a
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256 SWITCH_EXPR the corresponding element in CONDITION_CASES is a
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257 CASE_LABEL_EXPR. */
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258 vec<gimple *> conditions;
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259 vec<gimple *> condition_cases;
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260 vec<data_reference_p> data_refs;
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261 vec<scalar_use> read_scalar_refs;
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262 vec<tree> write_scalar_refs;
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263 } *gimple_poly_bb_p;
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264
67
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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265 #define GBB_BB(GBB) (GBB)->bb
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266 #define GBB_PBB(GBB) (GBB)->pbb
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267 #define GBB_DATA_REFS(GBB) (GBB)->data_refs
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268 #define GBB_CONDITIONS(GBB) (GBB)->conditions
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269 #define GBB_CONDITION_CASES(GBB) (GBB)->condition_cases
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270
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271 /* Return the innermost loop that contains the basic block GBB. */
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272
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273 static inline struct loop *
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274 gbb_loop (gimple_poly_bb_p gbb)
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275 {
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276 return GBB_BB (gbb)->loop_father;
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277 }
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278
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diff changeset
279 /* Returns the gimple loop, that corresponds to the loop_iterator_INDEX.
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280 If there is no corresponding gimple loop, we return NULL. */
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281
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282 static inline loop_p
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283 gbb_loop_at_index (gimple_poly_bb_p gbb, sese_l &region, int index)
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284 {
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285 loop_p loop = gbb_loop (gbb);
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286 int depth = sese_loop_depth (region, loop);
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287
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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288 while (--depth > index)
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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289 loop = loop_outer (loop);
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290
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291 gcc_assert (loop_in_sese_p (loop, region));
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292
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293 return loop;
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294 }
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295
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diff changeset
296 /* The number of common loops in REGION for GBB1 and GBB2. */
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297
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298 static inline int
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299 nb_common_loops (sese_l &region, gimple_poly_bb_p gbb1, gimple_poly_bb_p gbb2)
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300 {
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301 loop_p l1 = gbb_loop (gbb1);
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302 loop_p l2 = gbb_loop (gbb2);
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303 loop_p common = find_common_loop (l1, l2);
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304
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305 return sese_loop_depth (region, common);
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306 }
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307
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308 #endif