[#llvm-getOpcodeDef-077]
= xref:llvm.adoc[llvm]::getOpcodeDef
:relfileprefix: ../
:mrdocs:

See if Reg is defined by an single def instruction that is Opcode. Also try to do trivial folding if it's a COPY with same types. Returns null otherwise.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:llvm/MachineInstr.adoc[MachineInstr]*
getOpcodeDef(
    unsigned int Opcode,
    xref:llvm/Register.adoc[Register] Reg,
    xref:llvm/MachineRegisterInfo.adoc[MachineRegisterInfo] const& MRI);
----

== Return Value

The defining instruction matching `Opcode,` or nullptr.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *Opcode*
| Opcode that the defining instruction must match.
| *Reg*
| Virtual register whose defining instruction is inspected.
| *MRI*
| Register information for the function.
|===


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