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

Value Number Information for a live range definition.

== Synopsis

Declared in `<llvm/CodeGen/LiveInterval.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class VNInfo;
----

== Description

This class holds information about a machine level value, including definition and use points.

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:llvm/VNInfo/Allocator.adoc[`Allocator`] 
| Bump‐pointer allocator used to allocate VNInfo objects.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/VNInfo/2constructor-02.adoc[`VNInfo`]         [.small]#[constructor]#
| Constructors
| xref:llvm/VNInfo/copyFrom.adoc[`copyFrom`] 
| Copy definition information from `src` into this VNInfo.
| xref:llvm/VNInfo/dump.adoc[`dump`] 
| Dump this value number to the debug stream.
| xref:llvm/VNInfo/isPHIDef.adoc[`isPHIDef`] 
| Return true if this value is (or was) defined by a PHI.
| xref:llvm/VNInfo/isUnused.adoc[`isUnused`] 
| Returns true if this value is unused.
| xref:llvm/VNInfo/markUnused.adoc[`markUnused`] 
| Mark this value as unused.
| xref:llvm/VNInfo/print.adoc[`print`] 
| Print this value number to `OS.`
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:llvm/VNInfo/def.adoc[`def`] 
| The index of the defining instruction.
| xref:llvm/VNInfo/id.adoc[`id`] 
| The ID number of this value.
|===



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