The new .NET 10 feature for passing struct fields in registers does not appear to be working as advertized

[perl80903]

Type of issue

Code does not work

Description

As documented in the following SO question:

https://stackoverflow.com/questions/79978180/why-does-net-10-jit-not-pass-struct-fields-in-registers-despite-physical-promot#comment141107350_79978180

I am not the author of this question but I have verified that it does not appear to be possible with the given steps to persuade the .NET 10 runtime into behaving as described.

Page URL

https://learn.microsoft.com/en-us/dotnet/core/whats-new/dotnet-10/runtime#improved-code-generation-for-struct-arguments

Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/whats-new/dotnet-10/runtime.md

Document Version Independent Id

64b4a915-2d72-9816-31a1-866ad593bb27

Platform Id

489673e8-6332-c144-727a-e98fa5cea709

Article author

@gewarren

Metadata

• ID: 3357401d-36c1-995f-6b95-17865f4d58a5
• PlatformId: 489673e8-6332-c144-727a-e98fa5cea709
• Service: dotnet-fundamentals

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