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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Sun, 31 Jan 2016 17:34:49 +0900
parents afa8332a0e37
children 1172e4bd9c6f
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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
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41 **BURS**
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42 Bottom Up Rewriting System --- A method of instruction selection for code
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43 generation. An example is the `BURG
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44 <http://www.program-transformation.org/Transform/BURG>`_ tool.
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45
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46 C
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47 -
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48
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49 **CFI**
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50 Call Frame Information. Used in DWARF debug info and in C++ unwind info
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51 to show how the function prolog lays out the stack frame.
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52
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53 **CIE**
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54 Common Information Entry. A kind of CFI used to reduce the size of FDEs.
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55 The compiler creates a CIE which contains the information common across all
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56 the FDEs. Each FDE then points to its CIE.
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57
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58 **CSE**
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59 Common Subexpression Elimination. An optimization that removes common
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60 subexpression compuation. For example ``(a+b)*(a+b)`` has two subexpressions
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61 that are the same: ``(a+b)``. This optimization would perform the addition
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62 only once and then perform the multiply (but only if it's computationally
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63 correct/safe).
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64
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65 D
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66 -
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67
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68 **DAG**
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69 Directed Acyclic Graph
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70
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71 .. _derived pointer:
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72 .. _derived pointers:
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73
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74 **Derived Pointer**
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75 A pointer to the interior of an object, such that a garbage collector is
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76 unable to use the pointer for reachability analysis. While a derived pointer
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77 is live, the corresponding object pointer must be kept in a root, otherwise
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78 the collector might free the referenced object. With copying collectors,
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79 derived pointers pose an additional hazard that they may be invalidated at
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80 any `safe point`_. This term is used in opposition to `object pointer`_.
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81
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82 **DSA**
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83 Data Structure Analysis
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84
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85 **DSE**
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86 Dead Store Elimination
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87
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88 F
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89 -
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90
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91 **FCA**
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92 First Class Aggregate
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93
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94 **FDE**
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95 Frame Description Entry. A kind of CFI used to describe the stack frame of
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96 one function.
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97
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98 G
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99 -
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100
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101 **GC**
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102 Garbage Collection. The practice of using reachability analysis instead of
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103 explicit memory management to reclaim unused memory.
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104
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105 H
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106 -
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107
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108 .. _heap:
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109
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110 **Heap**
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111 In garbage collection, the region of memory which is managed using
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112 reachability analysis.
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113
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114 I
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115 -
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116
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117 **IPA**
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118 Inter-Procedural Analysis. Refers to any variety of code analysis that
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119 occurs between procedures, functions or compilation units (modules).
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120
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121 **IPO**
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122 Inter-Procedural Optimization. Refers to any variety of code optimization
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123 that occurs between procedures, functions or compilation units (modules).
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124
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125 **ISel**
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126 Instruction Selection
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127
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128 L
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129 -
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130
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131 **LCSSA**
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132 Loop-Closed Static Single Assignment Form
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133
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134 **LGTM**
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135 "Looks Good To Me". In a review thread, this indicates that the
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136 reviewer thinks that the patch is okay to commit.
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137
0
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138 **LICM**
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139 Loop Invariant Code Motion
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140
95
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141 **LSDA**
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142 Language Specific Data Area. C++ "zero cost" unwinding is built on top a
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143 generic unwinding mechanism. As the unwinder walks each frame, it calls
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144 a "personality" function to do language specific analysis. Each function's
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145 FDE points to an optional LSDA which is passed to the personality function.
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146 For C++, the LSDA contain info about the type and location of catch
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147 statements in that function.
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148
0
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149 **Load-VN**
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150 Load Value Numbering
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151
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152 **LTO**
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153 Link-Time Optimization
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154
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155 M
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156 -
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157
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158 **MC**
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159 Machine Code
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160
77
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diff changeset
161 N
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parents: 0
diff changeset
162 -
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163
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164 **NFC**
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165 "No functional change". Used in a commit message to indicate that a patch
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166 is a pure refactoring/cleanup.
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167 Usually used in the first line, so it is visible without opening the
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168 actual commit email.
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169
0
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170 O
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171 -
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172 .. _object pointer:
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173 .. _object pointers:
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174
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175 **Object Pointer**
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176 A pointer to an object such that the garbage collector is able to trace
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177 references contained within the object. This term is used in opposition to
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178 `derived pointer`_.
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179
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180 P
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181 -
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182
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183 **PRE**
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184 Partial Redundancy Elimination
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185
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186 R
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187 -
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188
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189 **RAUW**
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190
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191 Replace All Uses With. The functions ``User::replaceUsesOfWith()``,
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192 ``Value::replaceAllUsesWith()``, and
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193 ``Constant::replaceUsesOfWithOnConstant()`` implement the replacement of one
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194 Value with another by iterating over its def/use chain and fixing up all of
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195 the pointers to point to the new value. See
77
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196 also `def/use chains <ProgrammersManual.html#iterating-over-def-use-use-def-chains>`_.
0
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197
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198 **Reassociation**
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199 Rearranging associative expressions to promote better redundancy elimination
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200 and other optimization. For example, changing ``(A+B-A)`` into ``(B+A-A)``,
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201 permitting it to be optimized into ``(B+0)`` then ``(B)``.
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202
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203 .. _roots:
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204 .. _stack roots:
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205
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206 **Root**
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207 In garbage collection, a pointer variable lying outside of the `heap`_ from
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208 which the collector begins its reachability analysis. In the context of code
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209 generation, "root" almost always refers to a "stack root" --- a local or
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210 temporary variable within an executing function.
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211
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212 **RPO**
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213 Reverse postorder
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214
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215 S
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216 -
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217
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218 .. _safe point:
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219
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220 **Safe Point**
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221 In garbage collection, it is necessary to identify `stack roots`_ so that
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222 reachability analysis may proceed. It may be infeasible to provide this
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223 information for every instruction, so instead the information may is
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224 calculated only at designated safe points. With a copying collector,
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225 `derived pointers`_ must not be retained across safe points and `object
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226 pointers`_ must be reloaded from stack roots.
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227
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228 **SDISel**
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229 Selection DAG Instruction Selection.
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230
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231 **SCC**
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232 Strongly Connected Component
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233
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234 **SCCP**
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235 Sparse Conditional Constant Propagation
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diff changeset
236
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237 **SLP**
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238 Superword-Level Parallelism, same as :ref:`Basic-Block Vectorization
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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239 <lexicon-bb-vectorization>`.
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240
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241 **SRoA**
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242 Scalar Replacement of Aggregates
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243
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244 **SSA**
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245 Static Single Assignment
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246
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247 **Stack Map**
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248 In garbage collection, metadata emitted by the code generator which
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249 identifies `roots`_ within the stack frame of an executing function.
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250
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251 T
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parents:
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252 -
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parents:
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253
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diff changeset
254 **TBAA**
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 Type-Based Alias Analysis
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parents:
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256