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PTAL @dotnet/jit-contrib

for my education, why it's 1 otherwise? can we benefit from having natural alignment for unmanaged layouts as well?

Well, the question is what is natural alignment for custom layouts. Alignment for metadata based structs is based on contained fields, and computed by the runtime, but custom layouts in the JIT are just collections of bytes of specified size with some GC pointers in them.

Do you know if the backend makes use of any alignment information for struct copies/loads/stores? And if so, where?
For example, I don't see any uses of getClassAlignmentRequirement in the backend, so I am not sure what kind of alignment information we could be making use of and how we would be doing that.

for my education, why it's 1 otherwise? can we benefit from having natural alignment for unmanaged layouts as well?

Well, the question is what is natural alignment for custom layouts. Alignment for metadata based structs is based on contained fields, and computed by the runtime, but custom layouts in the JIT are just collections of bytes of specified size with some GC pointers in them.

Do you know if the backend makes use of any alignment information for struct copies/loads/stores? And if so, where? For example, I don't see any uses of getClassAlignmentRequirement in the backend, so I am not sure what kind of alignment information we could be making use of and how we would be doing that.

Not sure to be honest, except for types with GC being rounded up to pointer size?

for my education, why it's 1 otherwise? can we benefit from having natural alignment for unmanaged layouts as well?

Well, the question is what is natural alignment for custom layouts. Alignment for metadata based structs is based on contained fields, and computed by the runtime, but custom layouts in the JIT are just collections of bytes of specified size with some GC pointers in them.
Do you know if the backend makes use of any alignment information for struct copies/loads/stores? And if so, where? For example, I don't see any uses of getClassAlignmentRequirement in the backend, so I am not sure what kind of alignment information we could be making use of and how we would be doing that.

Not sure to be honest, except for types with GC being rounded up to pointer size?

Yeah, I wonder if the logic we have that loads from memory actually is doing some unaligned loads in some cases.

/ba-g iOS dead letter