--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGenObjC/interface-layout-64.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,121 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
+
+// CHECK: @"OBJC_IVAR_$_I3._iv2" = global i64 8, section "__DATA, __objc_ivar", align 8
+// CHECK: @"OBJC_IVAR_$_I3._iv3" = global i64 12, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I3" = internal global {{.*}} { i32 0, i32 8, i32 13
+// CHECK: @"OBJC_IVAR_$_I4._iv4" = global i64 13, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I4" = internal global {{.*}} { i32 0, i32 13, i32 14, {{.*}}
+// CHECK: @"OBJC_IVAR_$_I5._iv6_synth" = hidden global i64 16, section "__DATA, __objc_ivar", align 8
+// CHECK: @"OBJC_IVAR_$_I5._iv7_synth" = hidden global i64 20, section "__DATA, __objc_ivar", align 8
+// CHECK: @"OBJC_IVAR_$_I5._iv5" = global i64 14, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I5" = internal global {{.*}} { i32 0, i32 14, i32 24, {{.*}}
+// CHECK: @"OBJC_IVAR_$_I6.iv0" = global i64 0, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I6" = internal global {{.*}} { i32 2, i32 0, i32 1, {{.*}}
+// CHECK: @"OBJC_IVAR_$_I8.b" = global i64 8, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I8" = internal global {{.*}} { i32 0, i32 8, i32 16, {{.*}}
+// CHECK: @"OBJC_IVAR_$_I9.iv0" = global i64 0, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I9" = internal global {{.*}} { i32 2, i32 0, i32 4, {{.*}}
+// CHECK: @"OBJC_IVAR_$_I10.iv1" = global i64 4, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I10" = internal global {{.*}} { i32 0, i32 4, i32 5, {{.*}}
+// CHECK: _OBJC_CLASS_RO_$_I11" = internal global {{.*}} { i32 0, i32 5, i32 5, {{.*}}
+// CHECK: @"OBJC_IVAR_$_I12.iv2" = global i64 8, section "__DATA, __objc_ivar", align 8
+// CHECK: _OBJC_CLASS_RO_$_I12" = internal global {{.*}} { i32 0, i32 8, i32 12, {{.*}}
+
+/*
+  Compare to:
+    gcc -m64 -S -o - interface-layout-64.m | grep '^_OBJC_IVAR_$_*{{.*}}' -A 1
+  and 
+    gcc -m64 -S -o - interface-layout-64.m | grep '^l{{.*}}_CLASS_RO_$_I[0-9]*' -A 3
+ */
+
+struct s0 {
+  double x;
+};
+
+@interface I2 {
+  struct s0 _iv1;
+}
+@end
+
+@interface I3 : I2 {
+  unsigned int _iv2 :1;
+  unsigned : 0;
+  unsigned int _iv3 : 3;
+}
+@end
+
+@interface I4 : I3 {
+ char _iv4;
+}
+@end
+
+@interface I5 : I4 {
+ char _iv5;
+}
+
+@property int prop0;
+@end
+
+@implementation I3
+@end
+
+@implementation I4 
+@end
+
+@interface I5 ()
+@property int prop1;
+@property char prop2;
+@end
+
+@implementation I5
+@synthesize prop0 = _iv6_synth;
+@synthesize prop1 = _iv7_synth;
+@synthesize prop2 = _iv5;
+@end
+
+// The size rounds up to the next available byte.
+@interface I6 {
+  unsigned iv0 : 2;
+}
+@end
+@implementation I6
+@end
+
+// The start of the subclass includes padding for its own alignment.
+@interface I7 {
+  char a;
+}
+@end
+@interface I8 : I7 {
+  double b;
+}
+@end
+@implementation I8
+@end
+
+// Padding bit-fields
+@interface I9 {
+  unsigned iv0 : 2;
+  unsigned : 0;
+}
+@end
+@implementation I9
+@end
+@interface I10 : I9 {
+  unsigned iv1 : 2;
+}
+@end
+@implementation I10
+@end
+
+// Empty structures
+@interface I11 : I10
+@end
+@implementation I11
+@end
+@interface I12 : I11 {
+  unsigned iv2;
+}
+@end
+@implementation I12
+@end