Add AArch64 as an experimental target.

This patch adds support for AArch64 (ARM's 64-bit architecture) to
LLVM in the "experimental" category. Currently, it won't be built
unless requested explicitly.

This initial commit should have support for:
    + Assembly of all scalar (i.e. non-NEON, non-Crypto) instructions
      (except the late addition CRC instructions).
    + CodeGen features required for C++03 and C99.
    + Compilation for the "small" memory model: code+static data <
      4GB.
    + Absolute and position-independent code.
    + GNU-style (i.e. "__thread") TLS.
    + Debugging information.

The principal omission, currently, is performance tuning.

This patch excludes the NEON support also reviewed due to an outbreak of
batshit insanity in our legal department. That will be committed soon bringing
the changes to precisely what has been approved.

Further reviews would be gratefully received.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174054 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/Target/AArch64/AArch64TargetObjectFile.h b/lib/Target/AArch64/AArch64TargetObjectFile.h
new file mode 100644
index 0000000..07caac1
--- /dev/null
+++ b/lib/Target/AArch64/AArch64TargetObjectFile.h
@@ -0,0 +1,27 @@
+//===-- AArch64TargetObjectFile.h - AArch64 Object Info ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_AARCH64_TARGETOBJECTFILE_H
+#define LLVM_TARGET_AARCH64_TARGETOBJECTFILE_H
+
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+
+namespace llvm {
+
+  /// AArch64LinuxTargetObjectFile - This implementation is used for linux
+  /// AArch64.
+  class AArch64LinuxTargetObjectFile : public TargetLoweringObjectFileELF {
+    virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
+  };
+
+} // end namespace llvm
+
+#endif