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

4 files changed, 66 insertions, 0 deletions

diff --git a/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp b/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
new file mode 100644
index 0000000000..fa07d492ff
--- /dev/null
+++ b/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
@@ -0,0 +1,20 @@
+//===-- AArch64TargetInfo.cpp - AArch64 Target Implementation ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AArch64.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/TargetRegistry.h"
+using namespace llvm;
+
+Target llvm::TheAArch64Target;
+
+extern "C" void LLVMInitializeAArch64TargetInfo() {
+  RegisterTarget<Triple::aarch64>
+    X(TheAArch64Target, "aarch64", "AArch64");
+}
diff --git a/lib/Target/AArch64/TargetInfo/CMakeLists.txt b/lib/Target/AArch64/TargetInfo/CMakeLists.txt
new file mode 100644
index 0000000000..e236eed00b
--- /dev/null
+++ b/lib/Target/AArch64/TargetInfo/CMakeLists.txt
@@ -0,0 +1,7 @@
+include_directories( ${CMAKE_CURRENT_BINARY_DIR}/.. ${CMAKE_CURRENT_SOURCE_DIR}/.. )
+
+add_llvm_library(LLVMAArch64Info
+  AArch64TargetInfo.cpp
+  )
+
+add_dependencies(LLVMAArch64Info AArch64CommonTableGen)
diff --git a/lib/Target/AArch64/TargetInfo/LLVMBuild.txt b/lib/Target/AArch64/TargetInfo/LLVMBuild.txt
new file mode 100644
index 0000000000..5b003f0122
--- /dev/null
+++ b/lib/Target/AArch64/TargetInfo/LLVMBuild.txt
@@ -0,0 +1,24 @@
+;===- ./lib/Target/AArch64/TargetInfo/LLVMBuild.txt ------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = AArch64Info
+parent = AArch64
+required_libraries = MC Support Target
+add_to_library_groups = AArch64
+
diff --git a/lib/Target/AArch64/TargetInfo/Makefile b/lib/Target/AArch64/TargetInfo/Makefile
new file mode 100644
index 0000000000..9dc9aa4bcc
--- /dev/null
+++ b/lib/Target/AArch64/TargetInfo/Makefile
@@ -0,0 +1,15 @@
+##===- lib/Target/AArch64/TargetInfo/Makefile --------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+LEVEL = ../../../..
+LIBRARYNAME = LLVMAArch64Info
+
+# Hack: we need to include 'main' target directory to grab private headers
+CPPFLAGS = -I$(PROJ_OBJ_DIR)/.. -I$(PROJ_SRC_DIR)/..
+
+include $(LEVEL)/Makefile.common