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

Legalize an instruction by splitting it into simpler parts.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:llvm/LegalizerHelper/LegalizeResult.adoc[LegalizeResult]
lower(
    xref:llvm/MachineInstr.adoc[MachineInstr]& MI,
    unsigned int TypeIdx,
    xref:llvm/LLT.adoc[LLT] Ty);
----

== Return Value

Result of attempting to legalize the instruction.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *MI*
| Instruction being legalized.
| *TypeIdx*
| Type index that triggered the lower action.
| *Ty*
| Type associated with the lower action.
|===


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