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

Register pressure computed over an iterator‐delimited instruction region.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct RegionPressure
    : xref:llvm/RegisterPressure.adoc[RegisterPressure]
----

== Description

This is a less precise version of IntervalPressure for use when LiveIntervals are unavailable.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:llvm/RegisterPressure.adoc[RegisterPressure]`
| Base class for register pressure results.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/RegisterPressure/dump.adoc[`dump`] 
| Dump max pressure and live in/out registers to the debug stream.
| xref:llvm/RegionPressure/openBottom.adoc[`openBottom`] 
| Open the bottom of the region if it currently equals `PrevBottom.`
| xref:llvm/RegionPressure/openTop.adoc[`openTop`] 
| Open the top of the region if it currently equals `PrevTop.`
| xref:llvm/RegionPressure/reset.adoc[`reset`] 
| Clear this result so it can be used for another round of tracking.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:llvm/RegionPressure/BottomPos.adoc[`BottomPos`] 
| Block iterator at the bottom of the tracked region.
| xref:llvm/RegisterPressure/LiveInRegs.adoc[`LiveInRegs`] 
| List of live in virtual registers or physical register units.
| xref:llvm/RegisterPressure/LiveOutRegs.adoc[`LiveOutRegs`] 
| List of live‐out virtual registers or physical register units.
| xref:llvm/RegisterPressure/MaxSetPressure.adoc[`MaxSetPressure`] 
| Map of max reg pressure indexed by pressure set ID, not class ID.
| xref:llvm/RegionPressure/TopPos.adoc[`TopPos`] 
| Record the boundary of the region being tracked.
|===



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