[llvm-dev] Difference between "byval" and actually passing by value?

[edA-qa mort-ora-y via llvm-dev]

There appears to be a difference between passing by value:

    call void @foo(%some_struct %v)

And using the `byval` attribute on a pointer:

    call void @foo(%some_struct* byval %v)

They are not compatible with each other yet logically do the same
thing.  The second form is the one that appears to work with the ABI on
linux, and the first one not.

What is the reason for the difference?


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