1 files changed, 99 insertions, 0 deletions
diff --git a/llvm/unittests/CodeGen/SelectionDAGTestBase.h b/llvm/unittests/CodeGen/SelectionDAGTestBase.h
new file mode 100644
index 0000000..edc730d
--- /dev/null
+++ b/llvm/unittests/CodeGen/SelectionDAGTestBase.h
@@ -0,0 +1,99 @@
+//===---- llvm/unittest/CodeGen/SelectionDAGTestBase.h --------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/OptimizationRemarkEmitter.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/AsmParser/Parser.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/TargetLowering.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/TargetRegistry.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Target/TargetMachine.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+class SelectionDAGTestBase : public testing::Test {
+protected:
+  static void SetUpTestCase() {
+    InitializeAllTargets();
+    InitializeAllTargetMCs();
+  }
+
+  void SetUp() override {
+    StringRef Assembly = "@g = global i32 0\n"
+                         "@g_alias = alias i32, i32* @g\n"
+                         "define i32 @f() {\n"
+                         "  %1 = load i32, i32* @g\n"
+                         "  ret i32 %1\n"
+                         "}";
+
+    Triple TargetTriple("aarch64--");
+    std::string Error;
+    const Target *T = TargetRegistry::lookupTarget("", TargetTriple, Error);
+    // FIXME: These tests do not depend on AArch64 specifically, but we have to
+    // initialize a target. A skeleton Target for unittests would allow us to
+    // always run these tests.
+    if (!T)
+      GTEST_SKIP();
+
+    TargetOptions Options;
+    TM = std::unique_ptr<TargetMachine>(
+        T->createTargetMachine(TargetTriple, "", "+sve", Options, std::nullopt,
+                               std::nullopt, CodeGenOptLevel::Aggressive));
+    if (!TM)
+      GTEST_SKIP();
+
+    SMDiagnostic SMError;
+    M = parseAssemblyString(Assembly, SMError, Context);
+    ASSERT_TRUE(M && "Could not parse module!");
+    M->setDataLayout(TM->createDataLayout());
+
+    F = M->getFunction("f");
+    ASSERT_TRUE(F && "Could not get function f!");
+    G = M->getGlobalVariable("g");
+    ASSERT_TRUE(G && "Could not get global g!");
+    AliasedG = M->getNamedAlias("g_alias");
+    ASSERT_TRUE(AliasedG && "Could not get alias g_alias!");
+
+    MachineModuleInfo MMI(TM.get());
+
+    MF = std::make_unique<MachineFunction>(*F, *TM, *TM->getSubtargetImpl(*F),
+                                           MMI.getContext(), 0);
+
+    DAG = std::make_unique<SelectionDAG>(*TM, CodeGenOptLevel::None);
+    if (!DAG)
+      reportFatalUsageError("Failed to create SelectionDAG?");
+    OptimizationRemarkEmitter ORE(F);
+    FunctionAnalysisManager FAM;
+    FAM.registerPass([&] { return TM->getTargetIRAnalysis(); });
+
+    TargetTransformInfo TTI = TM->getTargetIRAnalysis().run(*F, FAM);
+    DAG->init(*MF, ORE, nullptr, nullptr, nullptr, nullptr, nullptr, MMI,
+              nullptr, TTI.hasBranchDivergence(F));
+  }
+
+  TargetLoweringBase::LegalizeTypeAction getTypeAction(EVT VT) {
+    return DAG->getTargetLoweringInfo().getTypeAction(Context, VT);
+  }
+
+  EVT getTypeToTransformTo(EVT VT) {
+    return DAG->getTargetLoweringInfo().getTypeToTransformTo(Context, VT);
+  }
+
+  LLVMContext Context;
+  std::unique_ptr<TargetMachine> TM;
+  std::unique_ptr<Module> M;
+  Function *F;
+  GlobalVariable *G;
+  GlobalAlias *AliasedG;
+  std::unique_ptr<MachineFunction> MF;
+  std::unique_ptr<SelectionDAG> DAG;
+};