Fix DoNotOptimize on MSVC

llvm-svn: 297532
2017-03-11 00:07:08 +00:00 · 2017-03-11 00:07:08 +00:00 · d2001dac3f
parent c28c7e5bd3
commit d2001dac3f
1 changed files with 4 additions and 2 deletions
--- a/libcxx/test/support/test_macros.h
+++ b/libcxx/test/support/test_macros.h
@ -188,9 +188,11 @@ inline void DoNotOptimize(Tp const& value) {
  asm volatile("" : : "g"(value) : "memory");
 }
 #else
+#include <intrin.h>
 template <class Tp>
-inline void DoNotOptimize(Tp const&) {
-  // FIXME: Do something here...
+inline void DoNotOptimize(Tp const& value) {
+  const volatile void* volatile = __builtin_addressof(value);
+  _ReadWriteBarrier();
 }
 #endif