diff --git a/test/CodeGenCUDA/unused-global-var.cu b/test/CodeGenCUDA/unused-global-var.cu
new file mode 100644
index 0000000..1dbb3a2
--- /dev/null
+++ b/test/CodeGenCUDA/unused-global-var.cu
@@ -0,0 +1,53 @@
+// REQUIRES: amdgpu-registered-target
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -fcuda-is-device -x hip %s \
+// RUN:   -std=c++11 -O3 -mllvm -amdgpu-internalize-symbols -emit-llvm -o - \
+// RUN:   -target-cpu gfx906 | FileCheck %s
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -fcuda-is-device -x hip %s \
+// RUN:   -std=c++11 -O3 -mllvm -amdgpu-internalize-symbols -emit-llvm -o - \
+// RUN:   -target-cpu gfx906 | FileCheck -check-prefix=NEGCHK %s
+
+#include "Inputs/cuda.h"
+
+// AMDGPU internalize unused global variables for whole-program compilation
+// (-fno-gpu-rdc for each TU, or -fgpu-rdc for LTO), which are then
+// eliminated by global DCE. If there are invisible unused address space casts
+// for global variables, these dead users need to be eliminated by global
+// DCE before internalization. This test makes sure unused global variables
+// are eliminated.
+
+// Check unused device/constant variables are eliminated.
+
+// NEGCHK-NOT: @v1
+__device__ int v1;
+
+// NEGCHK-NOT: @v2
+__constant__ int v2;
+
+// NEGCHK-NOT: @_ZL2v3
+constexpr int v3 = 1;
+
+// Check managed variables are always kept.
+
+// CHECK-DAG: @v4
+__managed__ int v4;
+
+// Check used device/constant variables are not eliminated.
+// CHECK-DAG: @u1
+__device__ int u1;
+
+// CHECK-DAG: @u2
+__constant__ int u2;
+
+// Check u3 is kept because its address is taken.
+// CHECK-DAG: @_ZL2u3
+constexpr int u3 = 2;
+
+// Check u4 is not kept because it is not ODR-use.
+// NEGCHK-NOT: @_ZL2u4
+constexpr int u4 = 3;
+
+__device__ int fun1(const int& x);
+
+__global__ void kern1(int *x) {
+  *x = u1 + u2 + fun1(u3) + u4;
+}