[swift-dev] Returning more than two scalars from C code

[Bryan Chan]

jgroff at apple.com wrote on 2016-03-22 02:37:47 PM:

> The runtime functions are hacked in various unsavory ways to give
> them Swift-like calling conventions. Many of them also have
> important semantics that the compiler needs to be aware of, so if
> they aren't exported as standard library API in some way, you really
> shouldn't interact with them directly.
> (swift_class_getInstanceExtents happens to be OK, but what are you
> trying to do with it?)

I am trying to build Swift on a different architecture (s390x). This
function was causing crashes due to the ABI mismatch, and I also
found that the issue is not 100% fixed on x86 either, so I wondered
if the community has an opinion on the right way to deal with this
in the runtime, or if the answer is simply "don't do this for
3-scalar returns".

Thanks, Bryan
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