[#llvm-LiveIntervals-shrinkToUses-09]
= xref:llvm.adoc[llvm]::xref:llvm/LiveIntervals.adoc[LiveIntervals]::shrinkToUses
:relfileprefix: ../../
:mrdocs:

Shrink a subregister live range to uses matching its lane mask.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
shrinkToUses(
    xref:llvm/LiveInterval/SubRange.adoc[LiveInterval::SubRange]& SR,
    xref:llvm/Register.adoc[Register] Reg);
----

== Description

Specialized version of shrinkToUses(LiveInterval _li, SmallVectorImpl<MachineInstr_> *dead) that works on a subregister live range and only looks at uses matching the lane mask of the subregister range. This may leave the subrange empty which needs to be cleaned up with LiveInterval::removeEmptySubranges() afterwards.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *SR*
| Subregister live range to shrink.
| *Reg*
| Virtual register that owns `SR.`
|===


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