1 files changed, 39 insertions, 0 deletions
diff --git a/clang/test/CodeGenCXX/cxx11-initializer-aggregate.cpp b/clang/test/CodeGenCXX/cxx11-initializer-aggregate.cpp
index 8bf35966f5b..4a593689650 100644
--- a/clang/test/CodeGenCXX/cxx11-initializer-aggregate.cpp
+++ b/clang/test/CodeGenCXX/cxx11-initializer-aggregate.cpp
@@ -11,6 +11,13 @@ namespace NonAggregateCopyInAggregateInit { // PR32044
   struct C { A &&p; } c{{1}};
 }
 
+namespace NearlyZeroInit {
+  // CHECK-DAG: @_ZN14NearlyZeroInit1aE = global {{.*}} <{ i32 1, i32 2, i32 3, [120 x i32] zeroinitializer }>
+  int a[123] = {1, 2, 3};
+  // CHECK-DAG: @_ZN14NearlyZeroInit1bE = global {{.*}} { i32 1, <{ i32, [2147483647 x i32] }> <{ i32 2, [2147483647 x i32] zeroinitializer }> }
+  struct B { int n; int arr[1024 * 1024 * 1024 * 2u]; } b = {1, {2}};
+}
+
 // CHECK-LABEL: define {{.*}}@_Z3fn1i(
 int fn1(int x) {
   // CHECK: %[[INITLIST:.*]] = alloca %struct.A
@@ -51,3 +58,35 @@ namespace NonTrivialInit {
   // meaningful.
   B b[30] = {};
 }
+
+namespace ZeroInit {
+  enum { Zero, One };
+  constexpr int zero() { return 0; }
+  constexpr int *null() { return nullptr; }
+  struct Filler {
+    int x;
+    Filler();
+  };
+  struct S1 {
+    int x;
+  };
+
+  // These declarations, if implemented elementwise, require huge
+  // amout of memory and compiler time.
+  unsigned char data_1[1024 * 1024 * 1024 * 2u] = { 0 };
+  unsigned char data_2[1024 * 1024 * 1024 * 2u] = { Zero };
+  unsigned char data_3[1024][1024][1024] = {{{0}}};
+  unsigned char data_4[1024 * 1024 * 1024 * 2u] = { zero() };
+  int *data_5[1024 * 1024 * 512] = { nullptr };
+  int *data_6[1024 * 1024 * 512] = { null() };
+  struct S1 data_7[1024 * 1024 * 512] = {{0}};
+  char data_8[1000 * 1000 * 1000] = {};
+  int (&&data_9)[1000 * 1000 * 1000] = {0};
+  unsigned char data_10[1024 * 1024 * 1024 * 2u] = { 1 };
+  unsigned char data_11[1024 * 1024 * 1024 * 2u] = { One };
+  unsigned char data_12[1024][1024][1024] = {{{1}}};
+
+  // This variable must be initialized elementwise.
+  Filler data_e1[1024] = {};
+  // CHECK: getelementptr inbounds {{.*}} @_ZN8ZeroInit7data_e1E
+}