Mark an unreachable code path with llvm_unreachable. Pacifies GCC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189726 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/R600/AMDGPUISelDAGToDAG.cpp b/lib/Target/R600/AMDGPUISelDAGToDAG.cpp
index 4f78f2938f9b36dc38fd5ef8c8d669c430909b76..46e50bc52cf2119f8b9aefca2e3835b454b70dba 100644 (file)
--- a/lib/Target/R600/AMDGPUISelDAGToDAG.cpp
+++ b/lib/Target/R600/AMDGPUISelDAGToDAG.cpp
@@ -328,6 +328,7 @@ SDNode *AMDGPUDAGToDAGISel::Select(SDNode *N) {
       case 16: RegClassID = UseVReg ? AMDGPU::VReg_512RegClassID :
                                       AMDGPU::SReg_512RegClassID;
         break;
+      default: llvm_unreachable("Do not know how to lower this BUILD_VECTOR");
       }
     } else {
       // BUILD_VECTOR was lowered into an IMPLICIT_DEF + 4 INSERT_SUBREG