Add llvm_unreachable for ... unreachable code!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77480 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 505548773f5968795420e2d7cb6253ad72cb28cb..c8eed721eb28d03fefd1ffe27a2aa0f2746e1a59 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -6207,7 +6207,7 @@ X86TargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) {
   case Intrinsic::x86_sse41_ptestnzc:{
     unsigned X86CC = 0;
     switch (IntNo) {
-    default: break;
+    default: llvm_unreachable("Bad fallthrough in Intrinsic lowering.");
     case Intrinsic::x86_sse41_ptestz:
       // ZF = 1
       X86CC = X86::COND_E;