[RISCV][GISel] Fallback to SelectionDAG for RVV tuple intrinsics.

Author: topperc

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -25031,8 +25031,17 @@ bool RISCVTargetLowering::fallBackToDAGISel(const Instruction &Inst) const {
 
   if (auto *II = dyn_cast<IntrinsicInst>(&Inst)) {
     // Mark RVV intrinsic as supported.
-    if (RISCVVIntrinsicsTable::getRISCVVIntrinsicInfo(II->getIntrinsicID()))
+    if (RISCVVIntrinsicsTable::getRISCVVIntrinsicInfo(II->getIntrinsicID())) {
+      // GISel doesn't support tuple types yet.
+      if (Inst.getType()->isRISCVVectorTupleTy())
+        return true;
+
+      for (unsigned i = 0; i < II->arg_size(); ++i)
+        if (II->getArgOperand(i)->getType()->isRISCVVectorTupleTy())
+          return true;
+
       return false;
+    }
   }
 
   if (Inst.getType()->isScalableTy())