---
 clang/lib/Basic/Targets.cpp           |   14 ++++++++++++++
 clang/test/CodeGen/linux-arm-atomic.c |   10 ++++++++++
 2 files changed, 24 insertions(+)

Index: llvm-toolchain-snapshot_11~++20200326111000+4673699a470/clang/test/CodeGen/linux-arm-atomic.c
===================================================================
--- llvm-toolchain-snapshot_11~++20200326111000+4673699a470.orig/clang/test/CodeGen/linux-arm-atomic.c
+++ llvm-toolchain-snapshot_11~++20200326111000+4673699a470/clang/test/CodeGen/linux-arm-atomic.c
@@ -1,5 +1,15 @@
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-linux | FileCheck %s
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-linux | FileCheck %s
+
+typedef int _Atomic_word;
+_Atomic_word exchange_and_add(volatile _Atomic_word *__mem, int __val) {
+  return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL);
+}
+
+// CHECK: define {{.*}} @exchange_and_add
+// CHECK: atomicrmw {{.*}} add
+// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-linux | FileCheck %s
+// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-linux | FileCheck %s
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=thumbv7-unknown-linux | FileCheck %s
 // RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-freebsd | FileCheck %s