[#llvm-stableHashValue-00]
= xref:llvm.adoc[llvm]::stableHashValue
:relfileprefix: ../
:mrdocs:

Compute a stable hash of machine instruction `MI.`

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:llvm/stable_hash.adoc[stable_hash]
stableHashValue(
    xref:llvm/MachineInstr.adoc[MachineInstr] const& MI,
    bool HashVRegs = false,
    bool HashConstantPoolIndices = false,
    bool HashMemOperands = false);
----

== Description

Returns 0 if no stable hash could be computed. By default, virtual register definitions and memory operands are ignored so the hash is useful for CSE.

== Return Value

A stable hash of the machine instruction, or 0 if none could be computed.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *MI*
| The machine instruction to hash.
| *HashVRegs*
| Whether to include virtual register definitions.
| *HashConstantPoolIndices*
| Whether to include constant pool indices.
| *HashMemOperands*
| Whether to include memory operands.
|===


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