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Fix compile error to update llvm 5.0
author mir3636
date Tue, 12 Dec 2017 19:42:58 +0900
parents 803732b1fca8
children c2174574ed3a
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1 ================
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2 The LLVM Lexicon
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3 ================
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4
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5 .. note::
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6
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7 This document is a work in progress!
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8
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9 Definitions
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10 ===========
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11
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12 A
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13 -
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14
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15 **ADCE**
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16 Aggressive Dead Code Elimination
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17
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18 **AST**
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19 Abstract Syntax Tree.
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20
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21 Due to Clang's influence (mostly the fact that parsing and semantic
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22 analysis are so intertwined for C and especially C++), the typical
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23 working definition of AST in the LLVM community is roughly "the
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24 compiler's first complete symbolic (as opposed to textual)
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25 representation of an input program".
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26 As such, an "AST" might be a more general graph instead of a "tree"
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27 (consider the symbolic representation for the type of a typical "linked
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28 list node"). This working definition is closer to what some authors
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29 call an "annotated abstract syntax tree".
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30
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31 Consult your favorite compiler book or search engine for more details.
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32
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33 B
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34 -
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35
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36 .. _lexicon-bb-vectorization:
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37
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38 **BB Vectorization**
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39 Basic-Block Vectorization
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40
121
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41 **BDCE**
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42 Bit-tracking dead code elimination. Some bit-wise instructions (shifts,
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43 ands, ors, etc.) "kill" some of their input bits -- that is, they make it
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44 such that those bits can be either zero or one without affecting control or
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45 data flow of a program. The BDCE pass removes instructions that only
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46 compute these dead bits.
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47
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48 **BURS**
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49 Bottom Up Rewriting System --- A method of instruction selection for code
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50 generation. An example is the `BURG
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51 <http://www.program-transformation.org/Transform/BURG>`_ tool.
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52
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53 C
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54 -
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55
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56 **CFI**
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57 Call Frame Information. Used in DWARF debug info and in C++ unwind info
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58 to show how the function prolog lays out the stack frame.
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59
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60 **CIE**
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61 Common Information Entry. A kind of CFI used to reduce the size of FDEs.
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62 The compiler creates a CIE which contains the information common across all
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63 the FDEs. Each FDE then points to its CIE.
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64
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65 **CSE**
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66 Common Subexpression Elimination. An optimization that removes common
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67 subexpression compuation. For example ``(a+b)*(a+b)`` has two subexpressions
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68 that are the same: ``(a+b)``. This optimization would perform the addition
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69 only once and then perform the multiply (but only if it's computationally
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70 correct/safe).
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71
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72 D
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73 -
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74
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75 **DAG**
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76 Directed Acyclic Graph
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77
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78 .. _derived pointer:
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79 .. _derived pointers:
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80
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81 **Derived Pointer**
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82 A pointer to the interior of an object, such that a garbage collector is
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83 unable to use the pointer for reachability analysis. While a derived pointer
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84 is live, the corresponding object pointer must be kept in a root, otherwise
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85 the collector might free the referenced object. With copying collectors,
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86 derived pointers pose an additional hazard that they may be invalidated at
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87 any `safe point`_. This term is used in opposition to `object pointer`_.
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88
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89 **DSA**
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90 Data Structure Analysis
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91
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92 **DSE**
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93 Dead Store Elimination
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94
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95 F
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96 -
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97
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98 **FCA**
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99 First Class Aggregate
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100
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101 **FDE**
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102 Frame Description Entry. A kind of CFI used to describe the stack frame of
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103 one function.
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104
0
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105 G
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106 -
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107
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108 **GC**
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109 Garbage Collection. The practice of using reachability analysis instead of
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110 explicit memory management to reclaim unused memory.
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111
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112 **GEP**
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113 ``GetElementPtr``. An LLVM IR instruction that is used to get the address
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114 of a subelement of an aggregate data structure. It is documented in detail
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115 `here <http://llvm.org/docs/GetElementPtr.html>`_.
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116
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117 **GVN**
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118 Global Value Numbering. GVN is a pass that partitions values computed by a
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119 function into congruence classes. Values ending up in the same congruence
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120 class are guaranteed to be the same for every execution of the program.
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121 In that respect, congruency is a compile-time approximation of equivalence
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122 of values at runtime.
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123
0
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124 H
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125 -
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126
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127 .. _heap:
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128
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129 **Heap**
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130 In garbage collection, the region of memory which is managed using
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131 reachability analysis.
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132
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133 I
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134 -
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135
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136 **IPA**
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137 Inter-Procedural Analysis. Refers to any variety of code analysis that
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138 occurs between procedures, functions or compilation units (modules).
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139
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140 **IPO**
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141 Inter-Procedural Optimization. Refers to any variety of code optimization
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142 that occurs between procedures, functions or compilation units (modules).
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143
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144 **ISel**
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145 Instruction Selection
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146
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147 L
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148 -
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diff changeset
149
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150 **LCSSA**
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151 Loop-Closed Static Single Assignment Form
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152
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153 **LGTM**
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154 "Looks Good To Me". In a review thread, this indicates that the
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155 reviewer thinks that the patch is okay to commit.
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156
0
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157 **LICM**
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158 Loop Invariant Code Motion
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159
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160 **LSDA**
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161 Language Specific Data Area. C++ "zero cost" unwinding is built on top a
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162 generic unwinding mechanism. As the unwinder walks each frame, it calls
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163 a "personality" function to do language specific analysis. Each function's
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164 FDE points to an optional LSDA which is passed to the personality function.
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165 For C++, the LSDA contain info about the type and location of catch
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166 statements in that function.
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167
0
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168 **Load-VN**
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169 Load Value Numbering
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170
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171 **LTO**
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172 Link-Time Optimization
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173
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174 M
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175 -
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176
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177 **MC**
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178 Machine Code
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179
77
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180 N
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parents: 0
diff changeset
181 -
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182
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183 **NFC**
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184 "No functional change". Used in a commit message to indicate that a patch
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185 is a pure refactoring/cleanup.
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186 Usually used in the first line, so it is visible without opening the
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187 actual commit email.
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188
0
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189 O
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190 -
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191 .. _object pointer:
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192 .. _object pointers:
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193
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194 **Object Pointer**
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195 A pointer to an object such that the garbage collector is able to trace
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196 references contained within the object. This term is used in opposition to
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197 `derived pointer`_.
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198
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199 P
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200 -
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201
120
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202 **PR**
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203 Problem report. A bug filed on `the LLVM Bug Tracking System
121
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204 <https://bugs.llvm.org/enter_bug.cgi>`_.
120
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205
0
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206 **PRE**
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207 Partial Redundancy Elimination
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208
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209 R
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210 -
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211
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212 **RAUW**
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213
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214 Replace All Uses With. The functions ``User::replaceUsesOfWith()``,
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215 ``Value::replaceAllUsesWith()``, and
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216 ``Constant::replaceUsesOfWithOnConstant()`` implement the replacement of one
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217 Value with another by iterating over its def/use chain and fixing up all of
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218 the pointers to point to the new value. See
77
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219 also `def/use chains <ProgrammersManual.html#iterating-over-def-use-use-def-chains>`_.
0
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220
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221 **Reassociation**
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222 Rearranging associative expressions to promote better redundancy elimination
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223 and other optimization. For example, changing ``(A+B-A)`` into ``(B+A-A)``,
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224 permitting it to be optimized into ``(B+0)`` then ``(B)``.
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225
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226 .. _roots:
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227 .. _stack roots:
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228
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229 **Root**
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230 In garbage collection, a pointer variable lying outside of the `heap`_ from
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231 which the collector begins its reachability analysis. In the context of code
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232 generation, "root" almost always refers to a "stack root" --- a local or
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233 temporary variable within an executing function.
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234
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235 **RPO**
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236 Reverse postorder
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237
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238 S
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239 -
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240
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241 .. _safe point:
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242
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243 **Safe Point**
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244 In garbage collection, it is necessary to identify `stack roots`_ so that
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245 reachability analysis may proceed. It may be infeasible to provide this
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246 information for every instruction, so instead the information may is
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247 calculated only at designated safe points. With a copying collector,
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248 `derived pointers`_ must not be retained across safe points and `object
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249 pointers`_ must be reloaded from stack roots.
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250
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251 **SDISel**
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252 Selection DAG Instruction Selection.
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253
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254 **SCC**
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255 Strongly Connected Component
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256
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257 **SCCP**
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258 Sparse Conditional Constant Propagation
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259
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260 **SLP**
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261 Superword-Level Parallelism, same as :ref:`Basic-Block Vectorization
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262 <lexicon-bb-vectorization>`.
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263
121
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264 **Splat**
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265 Splat refers to a vector of identical scalar elements.
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266
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267 The term is based on the PowerPC Altivec instructions that provided
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268 this functionality in hardware. For example, "vsplth" and the corresponding
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269 software intrinsic "vec_splat()". Examples of other hardware names for this
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270 action include "duplicate" (ARM) and "broadcast" (x86).
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271
0
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272 **SRoA**
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273 Scalar Replacement of Aggregates
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274
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275 **SSA**
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276 Static Single Assignment
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277
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278 **Stack Map**
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279 In garbage collection, metadata emitted by the code generator which
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280 identifies `roots`_ within the stack frame of an executing function.
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281
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282 T
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283 -
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diff changeset
284
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
285 **TBAA**
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
286 Type-Based Alias Analysis
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
287