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add explanations for CSE and DCE to Glossary.md #185

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add explanations for CSE and DCE to Glossary.md #185

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add explanations for CSE and DCE to Glossary.md
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10 changes: 10 additions & 0 deletions website/content/getting_started/Glossary.md
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Expand Up @@ -29,6 +29,16 @@ Conversion refers to a transformation between (or within) dialects, but all
still within MLIR, whereas translation refers to a transformation between MLIR
and an external representation.

### [CSE (Constant Subexpression Elimination)](../docs/Passes/#-cse)

CSE eliminates expressions computing already-computed values.

### DCE (Dead Code Elimination)

DCE removes unreachable code and expressions leading to unused results.
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The [canonicalize pass](https://mlir.llvm.org/docs/Canonicalization/) performs DCE as part of the canonicalization.

#### [Declarative Rewrite Rule](../docs/DeclarativeRewrites) (DRR)

A [rewrite rule](https://en.wikipedia.org/wiki/Graph_rewriting) which can be
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