--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGenObjC/block-byref-variable-layout.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,49 @@
+// RUN: %clang_cc1 -fblocks -fobjc-arc -fobjc-runtime-has-weak -triple x86_64-apple-darwin -emit-llvm %s -o - | FileCheck %s
+
+// rdar://12759433
+@class NSString;
+
+void Test12759433() {
+ __block __unsafe_unretained NSString *uuByref = (__bridge NSString *)(void*)0x102030405060708;
+ void (^block)() = ^{ uuByref = 0; };
+ block();
+}
+// CHECK: %struct.__block_byref_uuByref = type { i8*, %struct.__block_byref_uuByref*, i32, i32, [[ZERO:%.*]]* }
+int main() {
+  __block __weak id wid;
+  __block long XXX;
+  __block id ID;
+  __block struct S {
+     int iS;
+     double iD;
+     void *pv;
+     __unsafe_unretained id unsunr;
+  } import;
+  void (^c)() = ^{
+// Inline flag for BYREF variable layout (1107296256): BLOCK_BYREF_HAS_COPY_DISPOSE BLOCK_BYREF_LAYOUT_WEAK
+// CHECK: store i32 1107296256, i32* [[T0:%.*]]
+  wid = 0;
+
+// Inline flag for BYREF variable layout (536870912): BLOCK_BYREF_LAYOUT_NON_OBJECT
+// CHECK: store i32 536870912, i32* [[T1:%.*]]
+    XXX = 12345;
+
+// Inline flag for BYREF variable layout (838860800): BLOCK_BYREF_HAS_COPY_DISPOSE BLOCK_BYREF_LAYOUT_STRONG
+// CHECK: store i32 838860800, i32* [[T2:%.*]]
+    ID = 0;
+
+// Inline flag for BYREF variable layout (268435456): BLOCK_BYREF_LAYOUT_EXTENDED
+// BYREF variable layout: BL_NON_OBJECT_WORD:3, BL_UNRETAINED:1, BL_OPERATOR:0
+// CHECK: store i32 268435456, i32* [[T3:%.*]]
+    import.iD = 3.14;
+
+  };
+  c();
+}
+
+// rdar://12787751
+typedef char mds_path_t[1024];
+void directVolumePerfWaitForStoreState()
+{
+ __block mds_path_t path;
+}