AArch64: teach Clang about __clear_cache intrinsic

libgcc provides a __clear_cache intrinsic on AArch64, much like it
does on 32-bit ARM.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181111 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 22 insertions, 0 deletions

diff --git a/test/CodeGen/builtins-aarch64.c b/test/CodeGen/builtins-aarch64.c
new file mode 100644
index 0000000000..8a93cb41fa
--- /dev/null
+++ b/test/CodeGen/builtins-aarch64.c
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -O3 -emit-llvm -o - %s | FileCheck %s
+
+void f0(char *a, char *b) {
+	__clear_cache(a,b);
+// CHECK: call {{.*}} @__clear_cache
+}
diff --git a/test/Sema/builtins-aarch64.c b/test/Sema/builtins-aarch64.c
new file mode 100644
index 0000000000..03e03343eb
--- /dev/null
+++ b/test/Sema/builtins-aarch64.c
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -fsyntax-only -verify %s
+
+void test_clear_cache_chars(char *start, char *end) {
+  __clear_cache(start, end);
+}
+
+void test_clear_cache_voids(void *start, void *end) {
+  __clear_cache(start, end);
+}
+
+void test_clear_cache_no_args() {
+  // AArch32 version of this is variadic (at least syntactically).
+  // However, on AArch64 GCC does not permit this call and the
+  // implementation I've seen would go disastrously wrong.
+  __clear_cache(); // expected-error {{too few arguments to function call}}
+}