[llvm-exegesis] Add an AArch64 target

The target does just enough to be able to run llvm-exegesis in latency mode for
at least some opcodes.

Differential Revision: https://reviews.llvm.org/D48780

llvm-svn: 336187

3 files changed, 62 insertions, 0 deletions

diff --git a/llvm/unittests/tools/llvm-exegesis/AArch64/CMakeLists.txt b/llvm/unittests/tools/llvm-exegesis/AArch64/CMakeLists.txt
new file mode 100644
index 00000000000..392efce26c0
--- /dev/null
+++ b/llvm/unittests/tools/llvm-exegesis/AArch64/CMakeLists.txt
@@ -0,0 +1,21 @@
+include_directories(
+  ${LLVM_MAIN_SRC_DIR}/lib/Target/AArch64
+  ${LLVM_BINARY_DIR}/lib/Target/AArch64
+  ${LLVM_MAIN_SRC_DIR}/tools/llvm-exegesis/lib
+  )
+
+set(LLVM_LINK_COMPONENTS
+  MC
+  MCParser
+  Object
+  Support
+  Symbolize
+  AArch64
+  )
+
+add_llvm_unittest(LLVMExegesisAArch64Tests
+  TargetTest.cpp
+  )
+target_link_libraries(LLVMExegesisAArch64Tests PRIVATE
+  LLVMExegesis
+  LLVMExegesisAArch64)
diff --git a/llvm/unittests/tools/llvm-exegesis/AArch64/TargetTest.cpp b/llvm/unittests/tools/llvm-exegesis/AArch64/TargetTest.cpp
new file mode 100644
index 00000000000..7d1f2e4804e
--- /dev/null
+++ b/llvm/unittests/tools/llvm-exegesis/AArch64/TargetTest.cpp
@@ -0,0 +1,38 @@
+#include "Target.h"
+
+#include <cassert>
+#include <memory>
+
+#include "MCTargetDesc/AArch64MCTargetDesc.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace exegesis {
+
+void InitializeAArch64ExegesisTarget();
+
+namespace {
+
+using testing::Gt;
+using testing::NotNull;
+using testing::SizeIs;
+
+class AArch64TargetTest : public ::testing::Test {
+protected:
+  AArch64TargetTest()
+      : Target_(ExegesisTarget::lookup(llvm::Triple("aarch64-unknown-linux"))) {
+    EXPECT_THAT(Target_, NotNull());
+  }
+  static void SetUpTestCase() { InitializeAArch64ExegesisTarget(); }
+
+  const ExegesisTarget *const Target_;
+};
+
+TEST_F(AArch64TargetTest, SetRegToConstant) {
+  // The AArch64 target currently doesn't know how to set register values
+  const auto Insts = Target_->setRegToConstant(llvm::AArch64::X0);
+  EXPECT_THAT(Insts, SizeIs(0));
+}
+
+} // namespace
+} // namespace exegesis
diff --git a/llvm/unittests/tools/llvm-exegesis/CMakeLists.txt b/llvm/unittests/tools/llvm-exegesis/CMakeLists.txt
index 867df415b93..9afa17a8e80 100644
--- a/llvm/unittests/tools/llvm-exegesis/CMakeLists.txt
+++ b/llvm/unittests/tools/llvm-exegesis/CMakeLists.txt
@@ -23,3 +23,6 @@ endif()
 if(LLVM_TARGETS_TO_BUILD MATCHES "ARM")
 	add_subdirectory(ARM)
 endif()
+if(LLVM_TARGETS_TO_BUILD MATCHES "AArch64")
+  add_subdirectory(AArch64)
+endif()