================
@@ -52,6 +52,17 @@ class AMDGPUABIInfo final : public DefaultABIInfo {
void computeInfo(CGFunctionInfo &FI) const override;
RValue EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, QualType Ty,
AggValueSlot Slot) const override;
+
+ llvm::FixedVectorType *
+ getOptimalVectorType(llvm::FixedVectorType *T,
+ const LangOptions &Opt) const override {
+ // We have legal instructions for 96-bit so 3x32 can be supported.
+ // FIXME: This check should be a subtarget feature as technically SI
doesn't
+ // support it.
+ if (T->getNumElements() == 3 && getDataLayout().getTypeSizeInBits(T) == 96)
----------------
shiltian wrote:
It looks like they are preserved anyway. Clang only has special handling of
3-element vector.
https://github.com/llvm/llvm-project/pull/104661
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