Description
Description
Apologies if this is not in the right repo.
On migrating from .NET 6 to .NET 8 we noticed some failing tests.
It would appear that the behaviour of one of our methods changes after tiered compilation.
The issue only appears in release and goes away if MethodImpl.NoOptimization is applied to the method or <TieredCompilation>false</TieredCompilation> is set in the project file.
Reproduction Steps
A minimal console app that demonstrates the problem is at: https://github.com/ojb500/optimization-problem
Expected behavior
The results of the method calls should be consistent.
Actual behavior
The method starts to return an incorrect result after a few calls.
Regression?
Last known to be working with SDK 6.0.417 and runtime 6.0.25.
Known Workarounds
No response
Configuration
OS: Windows 10 Enterprise 22H2 build 19045.3693
win-x64
(We also see this on our build servers which have a different configuration)
❯ dotnet --list-sdks
6.0.417 [C:\Program Files\dotnet\sdk]
8.0.100 [C:\Program Files\dotnet\sdk]
❯ dotnet --list-runtimes
Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Other information
No response