Are there attributes that affect how the CLR optimizes during a JIT compile?

Question

As the question says, I am curious if any of you know about attributes that affect how the CLR will compile/optimize the bytecode. Is there an attribute that will affect code inlining decisions? Unroll loops? Are there undocumented attributes on classes generated for anonymous types/delegates? There's probably attributes to disable optimizations for debug purposes, but somehow I am not so interested in those.

Accepted Answer

Only one I've used in debugging something:

```
[MethodImpl(MethodImplOptions.NoInlining)]
```

This prevents JIT from inlining a method. There's also a:

```
[MethodImpl(MethodImplOptions.NoOptimization)]
```

Which just prevents JIT from optimizing anything, in case you found a rare bug in code generation that's actually causing the issue.

Are there attributes that affect how the CLR optimizes during a JIT compile?

Solution

Problem