When is a method eligible to be inlined by the CLR?

by

It is a jitter implementation detail, the x86 and x64 jitters have subtly different rules. This is casually documented in blog posts of team members that worked on the jitter but the teams certainly reserve the right to alter the rules. Looks like you already found them.

Inlining methods from other assemblies is most certainly supported, a lot of the .NET classes would work quite miserably if that wasn’t the case. You can see it at work when you look at the machine code generated for Console.WriteLine(), it often gets inlined when you pass a simple string. To see this for yourself, you need to switch to the Release build and change a debugger option. Tools + Options, Debugging, General, untick “Suppress JIT optimization on module load”.

There is otherwise no good reason to consider MethodImpOptions.NoInlining maligned, it’s pretty much why it exists in the first place. It is in fact used intentionally in the .NET framework on lots of small public methods that call an internal helper method. It makes exception stack traces easier to diagnose.

More Related Contents:

  1. Does the .NET CLR JIT compile every method, every time?
  2. How to see JIT-Compiled code in .NET VM (CLR)
  3. Deciphering the .NET clr20r3 exception parameters P1..P10
  4. Why Large Object Heap and why do we care?
  5. A definitive guide to API-breaking changes in .NET
  6. LINQ on the .NET 2.0 Runtime
  7. What are the roots?
  8. How do I detect at runtime that .NET version 4.5 is currently running your code?
  9. Resolving MSB3247 – Found conflicts between different versions of the same dependent assembly
  10. How do the .NET Framework, CLR and Visual Studio version numbers relate to each other?
  11. Equivalent of Class Loaders in .NET
  12. How to call managed code from unmanaged code?
  13. Is it possible to get parameters’ values for each frame in call stack in .NET
  14. No AppDomains in .NET Core! Why?
  15. Get Current .NET CLR version at runtime?
  16. Retrieve JIT output
  17. Is the CLR a virtual machine?
  18. Where is the .NET JIT-compiled code cached?
  19. Where is the .NET JIT-compiled code cached?
  20. Comparing two collections for equality irrespective of the order of items in them
  21. How can I set the opacity or transparency of a Panel in WinForms?
  22. What is the best implementation for AOP in .Net? [closed]
  23. Update primary key value using entity framework
  24. How to programmatically derive Windows Downloads folder “%USERPROFILE%/Downloads”?
  25. How can I force .NET to use a local copy of an assembly that’s in the GAC
  26. Coerce a WPF TextBox not working anymore in .NET 4.0
  27. How to edit EXIF data in .NET [closed]
  28. What is the difference between Culture and UICulture?
  29. What should be the lifetime of an NHibernate session?
  30. .net: How to parse a date with this format: 08 Feb 2011 06:46

Leave a Comment