View JIT and native disassembly

JetBrains Rider allows you to study disassembly of C# methods generated by JIT, ReadyToRun, and NativeAOT compilers.

This functionality relies on the .NET Disassembler plugin, which you need to install and enable.

Press Ctrl+Alt+S to open settings and then select Plugins.
Open the Marketplace tab, find the .NET Disassembler plugin, and click Install (restart the IDE if prompted).

Open the ASM window: either click the corresponding button on the right toolbar or choose View | Tool Windows | ASM from the menu.
Place the caret on a method, property, constructor, or type declaration. The disassembly will appear in the ASM window.

You can use the ASM Viewer to see how source code changes affect the disassembled output, helping you fine-tune low-level execution and performance.

When the first version of your code is open in the editor, set the caret at the necessary symbol (class, method, property) wait for the disassembly view to render, and click Create Snapshot on the toolbar.
A snapshot will be created and the diff view will be enabled. Initially, both sides of the diff are the same.
Make the necessary changes to your code and check how the newly disassembled code differs from the original. If necessary, click Force Recompile on the ASM Viewer toolbar.
To finish the comparison session, click Delete Snapshot on the ASM Viewer toolbar. This will delete the original snapshot and restore the normal disassembly view for the current state of your source code.

ASM Viewer settings

To configure the ASM viewer settings, click Settings on the toolbar.

The table below details all available settings. Note that ASM viewer settings are saved individually for each solution you open.

Show Comments	Enables JIT compiler annotations, such as optimization flags, CPU target, PGO statistics, and prolog size.
Diff-Friendly Output	Formats the disassembly to be more stable across runs, making it easier to compare diffs (for example, reducing address noise).

Use Tiered Compilation	Enables tiered JIT compilation, in which methods are initially compiled for fast startup and later recompiled with higher optimization levels once they are frequently executed.
Use PGO (Profile-Guided Optimization)	Enables profile-guided optimizations, allowing the JIT to use runtime execution data to generate more optimized native code.
Code Generator	Selects the JIT code generator implementation used to produce disassembled code.

dotnet build	Builds the project using `dotnet build` before generating disassembly.
Skip Package Restore	Skips NuGet package restore during the build step. Available only for the dotnet build mode.
dotnet publish	Publishes the project using `dotnet publish` before generating disassembly (typically used for self-contained or optimized outputs).
Target Framework	Specifies the target .NET Framework used for the build and JIT disassembly. The format must be in the TFM standard. For example, `net10.0`.

Run Project	Executes the project so that JIT compilation occurs at runtime before collecting disassembly. Can increase the time to produce disassembly.
Timeout (seconds)	The maximum time allowed for build and/or execution before producing disassembly is aborted. Set to `0` to disable the timeout.

09 February 2026