================
@@ -1780,6 +1780,14 @@ class TargetInfo : public TransferrableTargetInfo,
return 0;
}
+ /// \returns Target specific address space for indirect (e.g. sret)
arguments.
+ /// If such an address space exists, it must be convertible to and from the
+ /// alloca address space. If it does not, std::nullopt is returned and the
+ /// alloca address space will be used.
+ virtual std::optional<unsigned> getIndirectArgAddressSpace() const {
----------------
rjmccall wrote:
I would expect this to be a `LangAS`, since that's what our address-space
conversion lowerings are generally expressed in terms of. This also has the
advantage of avoiding a *lot* of heartache with implicit conversions around
`ABIInfo::getIndirect`, since `LangAS` is a scoped enum. And `LangAS::Default`
is a much more reasonable default argument for things like
`ABIArgInfo::getIndirect` than IR addrspace 0.
https://github.com/llvm/llvm-project/pull/114062
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