2 files changed, 28 insertions, 0 deletions
diff --git a/clang/test/CodeGen/atomic_init.c b/clang/test/CodeGen/atomic_init.c
new file mode 100644
index 00000000000..243eb602cb1
--- /dev/null
+++ b/clang/test/CodeGen/atomic_init.c
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
+
+// Check that no atomic operations are used in any initialisation of _Atomic
+// types.  
+
+_Atomic(int) i = 42;
+
+void foo()
+{
+  _Atomic(int) j = 12; // CHECK: store 
+                       // CHECK-NOT: atomic
+  __atomic_init(&j, 42); // CHECK: store 
+                         // CHECK-NOT: atomic
+}
diff --git a/clang/test/CodeGen/atomic_ops.c b/clang/test/CodeGen/atomic_ops.c
new file mode 100644
index 00000000000..9a18c9e9449
--- /dev/null
+++ b/clang/test/CodeGen/atomic_ops.c
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
+
+void foo(void)
+{
+  _Atomic(int) i = 0;
+  // Check that multiply / divides on atomics produce a cmpxchg loop
+  i *= 2; // CHECK: cmpxchg
+  i /= 2; // CHECK: cmpxchg
+  // These should be emitting atomicrmw instructions, but they aren't yet
+  i += 2; // CHECK: cmpxchg
+  i -= 2; // CHECK: cmpxchg
+  i++; // CHECK: cmpxchg
+  i--; // CHECK: cmpxchg
+}