The LLVM Lexicon

NOTE: This document is a work in progress!

Table Of Contents
- A -
ADCE
- B -
BURS
- C -
CSE
- D -
DSA DSE
- I -
IPA IPO
- L -
LICM Load-VN
- P -
PRE
- R -
Reassociation
- S -
SCCP SSA
Definitions
- A -
ADCE
Aggressive Dead Code Elimination
- B -
BURS
Bottom Up Rewriting System - A method of instruction selection for code generation. An example is the BURG tool.
- C -
CSE
Common Subexpression Elimination. An optimization that removes common subexpression compuation. For example (a+b)*(a+b) has two subexpressions that are the same: (a+b). This optimization would perform the addition only once and then perform the multiply (but only if its compulationally correct/safe).
- D -
DSA
Data Structure Analysis
DSE
Dead Store Elimination
- I -
IPA
Inter-Procedural Analysis. Refers to any variety of code analysis that occurs between procedures, functions or compilation units (modules).
IPO
Inter-Procedural Optimization. Refers to any variety of code optimization that occurs between procedures, functions or compilation units (modules).
- L -
LICM
Loop Invariant Code Motion
Load-VN
Load Value Numbering
- P -
PRE
Partial Redundancy Elimination
- R -
Reassociation
Rearranging associative expressions to promote better redundancy elimination and other optimization. For example, changing (A+B-A) into (B+A-A), permitting it to be optimized into (B+0) then (B).
- S -
SCCP
Sparse Conditional Constant Propagation
SSA
Static Single Assignment

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