[inline asm] Fix a crasher for an invalid value type/register class.

rdar://13731657

llvm-svn: 180226

1 files changed, 11 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index c1c8be4387a..6e613d606f4 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -6171,10 +6171,17 @@ void SelectionDAGBuilder::visitInlineAsm(ImmutableCallSite CS) {
           MatchedRegs.RegVTs.push_back(RegVT);
           MachineRegisterInfo &RegInfo = DAG.getMachineFunction().getRegInfo();
           for (unsigned i = 0, e = InlineAsm::getNumOperandRegisters(OpFlag);
-               i != e; ++i)
-            MatchedRegs.Regs.push_back
-              (RegInfo.createVirtualRegister(TLI.getRegClassFor(RegVT)));
-
+               i != e; ++i) {
+            if (const TargetRegisterClass *RC = TLI.getRegClassFor(RegVT))
+              MatchedRegs.Regs.push_back(RegInfo.createVirtualRegister(RC));
+            else {
+              LLVMContext &Ctx = *DAG.getContext();
+              Ctx.emitError(CS.getInstruction(), "inline asm error: This value"
+                            " type register class is not natively supported!");
+              report_fatal_error("inline asm error: This value type register "
+                                 "class is not natively supported!");
+            }
+          }
           // Use the produced MatchedRegs object to
           MatchedRegs.getCopyToRegs(InOperandVal, DAG, getCurDebugLoc(),
                                     Chain, &Flag, CS.getInstruction());