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

Code generation optimization level.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
enum class CodeGenOptLevel : int;
----

== Members

[cols="1,4"]
|===
| Name| Description
| `None` 
| No optimization (‐O0).
| `Less` 
| Minimal optimization (‐O1).
| `Default` 
| Default optimization (‐O2, ‐Os, ‐Oz).
| `Aggressive` 
| Aggressive optimization (‐O3).
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/createDwarfEHPass.adoc[`createDwarfEHPass`]
| createDwarfEHPass ‐ This pass mulches exception handling code into a form adapted to code generation. Required if using dwarf exception handling.
| xref:llvm/createExpandIRInstsPass.adoc[`createExpandIRInstsPass`]
| Create a pass that expands large div/rem and floating‐point instructions.
| xref:llvm/getStandardCSEConfigForOpt.adoc[`getStandardCSEConfigForOpt`]
| Return the standard CSEConfig for the given optimization level.
| xref:llvm/CodeGenOpt/getLevel.adoc[`CodeGenOpt::getLevel`]
| Get the `Level` identified by the integer `OL.`
| xref:llvm/CodeGenOpt/parseLevel.adoc[`CodeGenOpt::parseLevel`]
| Parse `C` as a single digit integer and get matching `CodeGenLevel.`
|===


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