[#llvm-UniqueMachineInstr]
= xref:llvm.adoc[llvm]::UniqueMachineInstr
:relfileprefix: ../
:mrdocs:

Wrap a MachineInstr for uniquing in a CSE FoldingSet.

== Synopsis

Declared in `<llvm/CodeGen/GlobalISel/CSEInfo.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class UniqueMachineInstr
    : public xref:llvm/FoldingSetNode.adoc[FoldingSetNode]
----

== Description

The tradeoff here is extra memory allocations for UniqueMachineInstr vs making MachineInstr bigger.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:llvm/FoldingSetNode.adoc[FoldingSetNode]`
| Convenience alias for the base node type stored in a folding set.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/UniqueMachineInstr/Profile.adoc[`Profile`] 
| Add this instruction's profile bits to `ID.`
|===


== Friends

[cols="1,4"]
|===
| Name| Description
| `xref:llvm/GISelCSEInfo.adoc[llvm::GISelCSEInfo]`
| CSE analysis that tracks instructions for common‐subexpression elimination.
|===


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