jeanPerier 011ba72507 [flang] finish BIND(C) VALUE derived type passing ABI on X86-64 (#77742) ...

Derived type passed with VALUE in BIND(C) context must be passed like C
struct and LLVM is not implementing the ABI for this (it is up to the
frontends like clang).

Previous patch #75802 implemented the simple cases where the derived
type have one field, this patch implements the general case. Note that
the generated LLVM IR is compliant from a X86-64 C ABI point of view and
compatible with clang generated assembly, but that it is not guaranteed
to match the LLVM IR signatures generated by clang for the C equivalent
functions because several LLVM IR signatures may lead to the same X86-64
signature.

2024-01-12 09:32:48 +01:00

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