Add clang support of RTM from TSX

- New options '-mrtm'/'-mno-rtm' are added to enable/disable RTM feature
- Builtin macro '__RTM__' is defined if RTM feature is enabled
- RTM intrinsic header is added and introduces 3 new intrinsics, namely
  '_xbegin', '_xend', and '_xabort'.
- 3 new builtins are added to keep compatible with gcc, namely
  '__builtin_ia32_xbegin', '__builtin_ia32_xend', and '__builtin_ia32_xabort'.
- Test cases for pre-defined macro and new intrinsic codegen are added.

llvm-svn: 167665

1 files changed, 23 insertions, 0 deletions

diff --git a/clang/test/CodeGen/rtm-builtins.c b/clang/test/CodeGen/rtm-builtins.c
new file mode 100644
index 00000000000..c4939a9a3d9
--- /dev/null
+++ b/clang/test/CodeGen/rtm-builtins.c
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 %s -O3 -triple=x86_64-apple-darwin -target-feature +rtm -emit-llvm -o - | FileCheck %s
+
+// Don't include mm_malloc.h, it's system specific.
+#define __MM_MALLOC_H
+
+#include <immintrin.h>
+
+unsigned int test_xbegin(void) {
+  // CHECK: i32 @llvm.x86.xbegin()
+  return _xbegin();
+}
+
+void
+test_xend(void) {
+  // CHECK: void @llvm.x86.xend()
+  _xend();
+}
+
+void
+test_xabort(void) {
+  // CHECK: void @llvm.x86.xabort(i8 2)
+  _xabort(2);
+}