Topic 9: Static Single Assignment...Given d: t = x op y t is live at end of node d if there exists...

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1 Topic 9 : Static Single Assignment COS 320 Compiling Techniques Princeton University Spring 2018 Prof. David August

Transcript of Topic 9: Static Single Assignment...Given d: t = x op y t is live at end of node d if there exists...

Page 1: Topic 9: Static Single Assignment...Given d: t = x op y t is live at end of node d if there exists path from end of d to use of t that does not go through definition of t. if program

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Topic 9: Static Single Assignment

COS 320

Compiling Techniques

Princeton University Spring 2018

Prof. David August

Page 2: Topic 9: Static Single Assignment...Given d: t = x op y t is live at end of node d if there exists path from end of d to use of t that does not go through definition of t. if program

Def-Use Chains, Use-Def Chains

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Use-Def Chains, Def-Use Chains

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Static Single Assignment

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Why SSA?

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Conversion to SSA Code

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Conversion to SSA Form

Page 8: Topic 9: Static Single Assignment...Given d: t = x op y t is live at end of node d if there exists path from end of d to use of t that does not go through definition of t. if program

Conversion to SSA Form

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Conversion to SSA Form

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Conversion to SSA Form

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Conversion to SSA Form

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Dominance Frontier

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Dominance Frontier

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Dominance Frontier Computation

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SSA Example

Page 16: Topic 9: Static Single Assignment...Given d: t = x op y t is live at end of node d if there exists path from end of d to use of t that does not go through definition of t. if program

Dominator Analysis

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SSA Example

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SSA Example

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SSA Example

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SSA Example

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Static Single Assignment

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SSA Dominance Property

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SSA Dead Code Elimination

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SSA Dead Code Elimination

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SSA Simple Constant Propagation

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SSA Simple Constant Propagation

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SSA Conditional Constant Propagation

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SSA Conditional Constant Propagation

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SSA Conditional Constant Propagation

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SSA Conditional Constant Propagation

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SSA Conditional Constant Propagation

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SSA Conditional Constant Propagation

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SSA Conditional Constant PropagationExample

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SSA Conditional Constant PropagationExample

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SSA Conditional Constant PropagationExample

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SSA Conditional Constant PropagationExample

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SSA Conditional Constant PropagationExample


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