[llvm-dev] Passing structs in C calling convention

Reid Kleckner via llvm-dev llvm-dev at lists.llvm.org
Fri May 6 13:08:24 PDT 2016

LLVM doesn't have enough information to do it for you. The LLVM type system
just isn't as expressive as the C type system, so frontends end up bearing
some of the lowering burden.

You should consider using clang to do the lowering for you:

On Fri, May 6, 2016 at 4:32 AM, Paweł Bylica <llvm-dev at lists.llvm.org>

> Hi,
> I want to declare a function that matches C ABI. Do I need to transform
> declarations like void @f(%struct.A %a) into void @f(%struct.A* byval %a)
> myself or LLVM can do it for me? Is this what "ccc" calling convention
> means?
> - Paweł
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