================
@@ -64,6 +66,27 @@ void CommonSPIRABIInfo::setCCs() {
RuntimeCC = llvm::CallingConv::SPIR_FUNC;
}
+ABIArgInfo SPIRVABIInfo::classifyReturnType(QualType RetTy) const {
+ if (getTarget().getTriple().getVendor() != llvm::Triple::AMD)
+ return DefaultABIInfo::classifyReturnType(RetTy);
+ if (!isAggregateTypeForABI(RetTy) || getRecordArgABI(RetTy, getCXXABI()))
+ return DefaultABIInfo::classifyReturnType(RetTy);
+
+ if (const RecordType *RT = RetTy->getAs<RecordType>()) {
+ const RecordDecl *RD = RT->getDecl();
+ if (RD->hasFlexibleArrayMember())
+ return DefaultABIInfo::classifyReturnType(RetTy);
+ }
+
+ // TODO: The AMDGPU ABI is non-trivial to represent in SPIR-V; in order to
+ // avoid encoding various architecture specific bits here we return
everything
+ // as direct to retain type info for things like aggregates, for later
perusal
+ // when translating back to LLVM/lowering in the BE. This is also why we
+ // disable flattening as the outcomes can mismatch between SPIR-V and AMDGPU.
+ // This will be revisited / optimised in the future.
----------------
AlexVlx wrote:
To wit, it's necessary pain, in the end, but we've not yet figured out the
right way to do it, since there are a few moving pieces involved. Perhaps the
solution will end up to add `byref` to the SPIR-V spec; in the meanwhile, this
is a sufficient, if temporary and slightly icky, solution.
https://github.com/llvm/llvm-project/pull/102776
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