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

Pass that shrink‐wraps unused library calls that may set errno.

== Synopsis

Declared in `<llvm/Transforms/Utils/LibCallsShrinkWrap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class LibCallsShrinkWrapPass
    : public xref:llvm/OptionalPassInfoMixin-0246.adoc[OptionalPassInfoMixin<LibCallsShrinkWrapPass>]
----

== Description

Guards calls whose results are unused but that can set errno on error, so the call runs only on the rare error path and is otherwise skipped.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:llvm/OptionalPassInfoMixin-0246.adoc[OptionalPassInfoMixin<LibCallsShrinkWrapPass>]`
| A CRTP mix‐in for passes that can be skipped.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/LibCallsShrinkWrapPass/run.adoc[`run`] 
| Run the libcalls‐shrink‐wrap pass over the function.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/LibCallsShrinkWrapPass/isRequired.adoc[`isRequired`] 
| Return false; optional passes may be skipped.
| xref:llvm/LibCallsShrinkWrapPass/name.adoc[`name`] 
| Returns the name of this pass.
|===



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