Index: clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
===================================================================
--- clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
+++ clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
@@ -528,6 +528,8 @@
   CGBuilderTy &Bld = CGF.Builder;
   unsigned LaneIDBits =
       llvm::Log2_32(CGF.getTarget().getGridValue().GV_Warp_Size);
+  assert((32U - LaneIDBits) <= 33 &&
+         "Invalid LaneIDBits size in NVPTX device.");
   unsigned LaneIDMask = ~0u >> (32u - LaneIDBits);
   auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime());
   return Bld.CreateAnd(RT.getGPUThreadID(CGF), Bld.getInt32(LaneIDMask),