unittests/MIR/MachineMetadata.cpp - llvm-project/llvm - Git at Google

 //===- MachineInstrBundleIteratorTest.cpp ---------------------------------===//
 //
 // 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/ADT/STLExtras.h"
 #include "llvm/CodeGen/MIRParser/MIRParser.h"
 #include "llvm/CodeGen/MIRPrinter.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineMemOperand.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineModuleSlotTracker.h"
 #include "llvm/CodeGen/MachineOperand.h"
 #include "llvm/CodeGen/TargetFrameLowering.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"
 #include "llvm/CodeGen/TargetLowering.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/FileCheck/FileCheck.h"
 #include "llvm/IR/MDBuilder.h"
 #include "llvm/IR/ModuleSlotTracker.h"
 #include "llvm/MC/MCAsmInfo.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 MachineMetadataTest : public testing::Test {
 public:
   MachineMetadataTest() {}

 protected:
   LLVMContext Context;
   std::unique_ptr<Module> M;
   std::unique_ptr<MIRParser> MIR;

   static void SetUpTestCase() {
     InitializeAllTargetInfos();
     InitializeAllTargets();
     InitializeAllTargetMCs();
   }

   void SetUp() override { M = std::make_unique<Module>("Dummy", Context); }

   void addHooks(ModuleSlotTracker &MST, const MachineOperand &MO) {
     // Setup hooks to assign slot numbers for the specified machine metadata.
     MST.setProcessHook([&MO](AbstractSlotTrackerStorage *AST, const Module *M,
                              bool ShouldInitializeAllMetadata) {
       if (ShouldInitializeAllMetadata) {
         if (MO.isMetadata())
           AST->createMetadataSlot(MO.getMetadata());
       }
     });
     MST.setProcessHook([&MO](AbstractSlotTrackerStorage *AST, const Function *F,
                              bool ShouldInitializeAllMetadata) {
       if (!ShouldInitializeAllMetadata) {
         if (MO.isMetadata())
           AST->createMetadataSlot(MO.getMetadata());
       }
     });
   }

   std::unique_ptr<LLVMTargetMachine>
   createTargetMachine(std::string TT, StringRef CPU, StringRef FS) {
     std::string Error;
     const Target *T = TargetRegistry::lookupTarget(TT, Error);
     if (!T)
       return nullptr;
     TargetOptions Options;
     return std::unique_ptr<LLVMTargetMachine>(
         static_cast<LLVMTargetMachine *>(T->createTargetMachine(
             TT, CPU, FS, Options, std::nullopt, std::nullopt)));
   }

   std::unique_ptr<Module> parseMIR(const TargetMachine &TM, StringRef MIRCode,
                                    const char *FnName, MachineModuleInfo &MMI) {
     SMDiagnostic Diagnostic;
     std::unique_ptr<MemoryBuffer> MBuffer = MemoryBuffer::getMemBuffer(MIRCode);
     MIR = createMIRParser(std::move(MBuffer), Context);
     if (!MIR)
       return nullptr;

     std::unique_ptr<Module> Mod = MIR->parseIRModule();
     if (!Mod)
       return nullptr;

     Mod->setDataLayout(TM.createDataLayout());

     if (MIR->parseMachineFunctions(*Mod, MMI)) {
       M.reset();
       return nullptr;
     }

     return Mod;
   }
 };

 // Helper to dump the printer output into a string.
 static std::string print(std::function<void(raw_ostream &OS)> PrintFn) {
   std::string Str;
   raw_string_ostream OS(Str);
   PrintFn(OS);
   OS.flush();
   return Str;
 }

 TEST_F(MachineMetadataTest, TrivialHook) {
   // Verify that post-process hook is invoked to assign slot numbers for
   // machine metadata.
   ASSERT_TRUE(M);

   // Create a MachineOperand with a metadata and print it.
   Metadata *MDS = MDString::get(Context, "foo");
   MDNode *Node = MDNode::get(Context, MDS);
   MachineOperand MO = MachineOperand::CreateMetadata(Node);

   // Checking some preconditions on the newly created
   // MachineOperand.
   ASSERT_TRUE(MO.isMetadata());
   ASSERT_EQ(MO.getMetadata(), Node);

   ModuleSlotTracker MST(M.get());
   addHooks(MST, MO);

   // Print a MachineOperand containing a metadata node.
   EXPECT_EQ("!0", print([&](raw_ostream &OS) {
               MO.print(OS, MST, LLT{}, /*OpIdx*/ ~0U, /*PrintDef=*/false,
                        /*IsStandalone=*/false,
                        /*ShouldPrintRegisterTies=*/false, /*TiedOperandIdx=*/0,
                        /*TRI=*/nullptr,
                        /*IntrinsicInfo=*/nullptr);
             }));
   // Print the definition of that metadata node.
   EXPECT_EQ("!0 = !{!\"foo\"}",
             print([&](raw_ostream &OS) { Node->print(OS, MST); }));
 }

 TEST_F(MachineMetadataTest, BasicHook) {
   // Verify that post-process hook is invoked to assign slot numbers for
   // machine metadata. When both LLVM IR and machine IR contain metadata,
   // ensure that machine metadata is always assigned after LLVM IR.
   ASSERT_TRUE(M);

   // Create a MachineOperand with a metadata and print it.
   Metadata *MachineMDS = MDString::get(Context, "foo");
   MDNode *MachineNode = MDNode::get(Context, MachineMDS);
   MachineOperand MO = MachineOperand::CreateMetadata(MachineNode);

   // Checking some preconditions on the newly created
   // MachineOperand.
   ASSERT_TRUE(MO.isMetadata());
   ASSERT_EQ(MO.getMetadata(), MachineNode);

   // Create metadata in LLVM IR.
   NamedMDNode *MD = M->getOrInsertNamedMetadata("namedmd");
   Metadata *MDS = MDString::get(Context, "bar");
   MDNode *Node = MDNode::get(Context, MDS);
   MD->addOperand(Node);

   ModuleSlotTracker MST(M.get());
   addHooks(MST, MO);

   // Print a MachineOperand containing a metadata node.
   EXPECT_EQ("!1", print([&](raw_ostream &OS) {
               MO.print(OS, MST, LLT{}, /*OpIdx*/ ~0U, /*PrintDef=*/false,
                        /*IsStandalone=*/false,
                        /*ShouldPrintRegisterTies=*/false, /*TiedOperandIdx=*/0,
                        /*TRI=*/nullptr,
                        /*IntrinsicInfo=*/nullptr);
             }));
   // Print the definition of these unnamed metadata nodes.
   EXPECT_EQ("!0 = !{!\"bar\"}",
             print([&](raw_ostream &OS) { Node->print(OS, MST); }));
   EXPECT_EQ("!1 = !{!\"foo\"}",
             print([&](raw_ostream &OS) { MachineNode->print(OS, MST); }));
 }

 static bool checkOutput(std::string CheckString, std::string Output) {
   auto CheckBuffer = MemoryBuffer::getMemBuffer(CheckString, "");
   auto OutputBuffer = MemoryBuffer::getMemBuffer(Output, "Output", false);

   SmallString<4096> CheckFileBuffer;
   FileCheckRequest Req;
   FileCheck FC(Req);
   StringRef CheckFileText =
       FC.CanonicalizeFile(*CheckBuffer.get(), CheckFileBuffer);

   SourceMgr SM;
   SM.AddNewSourceBuffer(MemoryBuffer::getMemBuffer(CheckFileText, "CheckFile"),
                         SMLoc());
   Regex PrefixRE = FC.buildCheckPrefixRegex();
   if (FC.readCheckFile(SM, CheckFileText, PrefixRE))
     return false;

   auto OutBuffer = OutputBuffer->getBuffer();
   SM.AddNewSourceBuffer(std::move(OutputBuffer), SMLoc());
   return FC.checkInput(SM, OutBuffer);
 }

 TEST_F(MachineMetadataTest, MMSlotTrackerAArch64) {
   auto TM = createTargetMachine(Triple::normalize("aarch64--"), "", "");
   if (!TM)
     GTEST_SKIP();

   StringRef MIRString = R"MIR(
 --- |
   define i32 @test0(i32* %p) {
     %r = load i32, i32* %p, align 4
     ret i32 %r
   }
 ...
 ---
 name:            test0
 liveins:
   - { reg: '$x0', virtual-reg: '%0' }
 body:             |
   bb.0 (%ir-block.0):
     liveins: $x0

   %0:gpr64common = COPY $x0
   %1:gpr32 = LDRWui %0, 0 :: (load (s32) from %ir.p)
 ...
 )MIR";

   MachineModuleInfo MMI(TM.get());
   M = parseMIR(*TM, MIRString, "test0", MMI);
   ASSERT_TRUE(M);

   auto *MF = MMI.getMachineFunction(*M->getFunction("test0"));
   auto *MBB = MF->getBlockNumbered(0);

   auto &MI = MBB->back();
   ASSERT_TRUE(MI.hasOneMemOperand());

   // Create and attached scoped AA metadata on that instruction with one MMO.
   MDBuilder MDB(Context);
   MDNode *Domain = MDB.createAnonymousAliasScopeDomain("domain");
   MDNode *Scope0 = MDB.createAnonymousAliasScope(Domain, "scope0");
   MDNode *Scope1 = MDB.createAnonymousAliasScope(Domain, "scope1");
   MDNode *Set0 = MDNode::get(Context, {Scope0});
   MDNode *Set1 = MDNode::get(Context, {Scope1});

   AAMDNodes AAInfo;
   AAInfo.TBAA = AAInfo.TBAAStruct = nullptr;
   AAInfo.Scope = Set0;
   AAInfo.NoAlias = Set1;

   auto *OldMMO = MI.memoperands().front();
   auto *NewMMO = MF->getMachineMemOperand(OldMMO, AAInfo);
   MI.setMemRefs(*MF, NewMMO);

   MachineModuleSlotTracker MST(MF);
   // Print that MI with new machine metadata, which slot numbers should be
   // assigned.
   EXPECT_EQ("%1:gpr32 = LDRWui %0, 0 :: (load (s32) from %ir.p, "
             "!alias.scope !0, !noalias !3)",
             print([&](raw_ostream &OS) {
               MI.print(OS, MST, /*IsStandalone=*/false, /*SkipOpers=*/false,
                        /*SkipDebugLoc=*/false, /*AddNewLine=*/false);
             }));

   std::vector<const MDNode *> Generated{Domain, Scope0, Scope1, Set0, Set1};
   // Examine machine metadata collected. They should match ones
   // afore-generated.
   std::vector<const MDNode *> Collected;
   MachineModuleSlotTracker::MachineMDNodeListType MDList;
   MST.collectMachineMDNodes(MDList);
   for (auto &MD : MDList)
     Collected.push_back(MD.second);

   llvm::sort(Generated);
   llvm::sort(Collected);
   EXPECT_EQ(Collected, Generated);

   // FileCheck the output from MIR printer.
   std::string Output = print([&](raw_ostream &OS) { printMIR(OS, *MF); });
   std::string CheckString = R"(
 CHECK: machineMetadataNodes:
 CHECK-DAG: ![[MMDOMAIN:[0-9]+]] = distinct !{!{{[0-9]+}}, !"domain"}
 CHECK-DAG: ![[MMSCOPE0:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope0"}
 CHECK-DAG: ![[MMSCOPE1:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope1"}
 CHECK-DAG: ![[MMSET0:[0-9]+]] = !{![[MMSCOPE0]]}
 CHECK-DAG: ![[MMSET1:[0-9]+]] = !{![[MMSCOPE1]]}
 CHECK: body:
 CHECK: %1:gpr32 = LDRWui %0, 0 :: (load (s32) from %ir.p, !alias.scope ![[MMSET0]], !noalias ![[MMSET1]])
 )";
   EXPECT_TRUE(checkOutput(CheckString, Output));
 }

 TEST_F(MachineMetadataTest, isMetaInstruction) {
   auto TM = createTargetMachine(Triple::normalize("x86_64--"), "", "");
   if (!TM)
     GTEST_SKIP();

   StringRef MIRString = R"MIR(
 --- |
   define void @test0(i32 %b) {
     ret void
   }
   !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
   !1 = !DIFile(filename: "a.c", directory: "/tmp")
   !2 = !{i32 7, !"Dwarf Version", i32 4}
   !3 = !{i32 2, !"Debug Info Version", i32 3}
   !4 = !{i32 1, !"wchar_size", i32 4}
   !5 = !{i32 7, !"uwtable", i32 1}
   !6 = !{i32 7, !"frame-pointer", i32 2}
   !7 = !{!""}
   !8 = distinct !DISubprogram(name: "test0", scope: !1, file: !1, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !12)
   !9 = !DISubroutineType(types: !10)
   !10 = !{null, !11}
   !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
   !12 = !{}
   !13 = !DILocalVariable(name: "b", arg: 1, scope: !8, file: !1, line: 1, type: !11)
   !14 = !DILocation(line: 1, column: 16, scope: !8)
 ...
 ---
 name:            test0
 machineFunctionInfo
 body:             |
   bb.0:
   $rdi = IMPLICIT_DEF
   KILL $rsi
   CFI_INSTRUCTION undefined $rax
   EH_LABEL 0
   GC_LABEL 0
   DBG_VALUE $rax, $noreg, !13, !DIExpression(), debug-location !14
   DBG_LABEL 0
   LIFETIME_START 0
   LIFETIME_END 0
   PSEUDO_PROBE 6699318081062747564, 1, 0, 0
   $xmm0 = ARITH_FENCE $xmm0
   MEMBARRIER
 ...
 )MIR";

   MachineModuleInfo MMI(TM.get());
   M = parseMIR(*TM, MIRString, "test0", MMI);
   ASSERT_TRUE(M);

   auto *MF = MMI.getMachineFunction(*M->getFunction("test0"));
   auto *MBB = MF->getBlockNumbered(0);

   for (auto It = MBB->begin(); It != MBB->end(); ++It) {
     MachineInstr &MI = *It;
     ASSERT_TRUE(MI.isMetaInstruction());
   }
 }

 TEST_F(MachineMetadataTest, MMSlotTrackerX64) {
   auto TM = createTargetMachine(Triple::normalize("x86_64--"), "", "");
   if (!TM)
     GTEST_SKIP();

   StringRef MIRString = R"MIR(
 --- |
   define i32 @test0(i32* %p) {
     %r = load i32, i32* %p, align 4
     ret i32 %r
   }
 ...
 ---
 name:            test0
 liveins:
   - { reg: '$rdi', virtual-reg: '%0' }
 body:             |
   bb.0 (%ir-block.0):
     liveins: $rdi

   %0:gr64 = COPY $rdi
   %1:gr32 = MOV32rm %0, 1, $noreg, 0, $noreg :: (load (s32) from %ir.p)
 ...
 )MIR";

   MachineModuleInfo MMI(TM.get());
   M = parseMIR(*TM, MIRString, "test0", MMI);
   ASSERT_TRUE(M);

   auto *MF = MMI.getMachineFunction(*M->getFunction("test0"));
   auto *MBB = MF->getBlockNumbered(0);

   auto &MI = MBB->back();
   ASSERT_FALSE(MI.memoperands_empty());
   ASSERT_TRUE(MI.hasOneMemOperand());

   // Create and attached scoped AA metadata on that instruction with one MMO.
   MDBuilder MDB(Context);
   MDNode *Domain = MDB.createAnonymousAliasScopeDomain("domain");
   MDNode *Scope0 = MDB.createAnonymousAliasScope(Domain, "scope0");
   MDNode *Scope1 = MDB.createAnonymousAliasScope(Domain, "scope1");
   MDNode *Set0 = MDNode::get(Context, {Scope0});
   MDNode *Set1 = MDNode::get(Context, {Scope1});

   AAMDNodes AAInfo;
   AAInfo.TBAA = AAInfo.TBAAStruct = nullptr;
   AAInfo.Scope = Set0;
   AAInfo.NoAlias = Set1;

   auto *OldMMO = MI.memoperands().front();
   auto *NewMMO = MF->getMachineMemOperand(OldMMO, AAInfo);
   MI.setMemRefs(*MF, NewMMO);

   MachineModuleSlotTracker MST(MF);
   // Print that MI with new machine metadata, which slot numbers should be
   // assigned.
   EXPECT_EQ("%1:gr32 = MOV32rm %0, 1, $noreg, 0, $noreg :: (load (s32) from %ir.p, "
             "!alias.scope !0, !noalias !3)",
             print([&](raw_ostream &OS) {
               MI.print(OS, MST, /*IsStandalone=*/false, /*SkipOpers=*/false,
                        /*SkipDebugLoc=*/false, /*AddNewLine=*/false);
             }));

   std::vector<const MDNode *> Generated{Domain, Scope0, Scope1, Set0, Set1};
   // Examine machine metadata collected. They should match ones
   // afore-generated.
   std::vector<const MDNode *> Collected;
   MachineModuleSlotTracker::MachineMDNodeListType MDList;
   MST.collectMachineMDNodes(MDList);
   for (auto &MD : MDList)
     Collected.push_back(MD.second);

   llvm::sort(Generated);
   llvm::sort(Collected);
   EXPECT_EQ(Collected, Generated);

   // FileCheck the output from MIR printer.
   std::string Output = print([&](raw_ostream &OS) { printMIR(OS, *MF); });
   std::string CheckString = R"(
 CHECK: machineMetadataNodes:
 CHECK-DAG: ![[MMDOMAIN:[0-9]+]] = distinct !{!{{[0-9]+}}, !"domain"}
 CHECK-DAG: ![[MMSCOPE0:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope0"}
 CHECK-DAG: ![[MMSCOPE1:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope1"}
 CHECK-DAG: ![[MMSET0:[0-9]+]] = !{![[MMSCOPE0]]}
 CHECK-DAG: ![[MMSET1:[0-9]+]] = !{![[MMSCOPE1]]}
 CHECK: body:
 CHECK: %1:gr32 = MOV32rm %0, 1, $noreg, 0, $noreg :: (load (s32) from %ir.p, !alias.scope ![[MMSET0]], !noalias ![[MMSET1]])
 )";
   EXPECT_TRUE(checkOutput(CheckString, Output));
 }

 TEST_F(MachineMetadataTest, MMSlotTrackerAMDGPU) {
   auto TM = createTargetMachine(Triple::normalize("amdgcn-amd-amdhsa"),
                                 "gfx1010", "");
   if (!TM)
     GTEST_SKIP();

   StringRef MIRString = R"MIR(
 --- |
   define i32 @test0(i32* %p) {
     %r = load i32, i32* %p, align 4
     ret i32 %r
   }
 ...
 ---
 name:            test0
 liveins:
   - { reg: '$vgpr0', virtual-reg: '%0' }
   - { reg: '$vgpr1', virtual-reg: '%1' }
   - { reg: '$sgpr30_sgpr31', virtual-reg: '%2' }
 body:             |
   bb.0 (%ir-block.0):
     liveins: $vgpr0, $vgpr1, $sgpr30_sgpr31

     %2:sreg_64 = COPY $sgpr30_sgpr31
     %1:vgpr_32 = COPY $vgpr1
     %0:vgpr_32 = COPY $vgpr0
     %8:vreg_64 = REG_SEQUENCE %0, %subreg.sub0, %1, %subreg.sub1
     %6:vreg_64 = COPY %8
     %5:vgpr_32 = FLAT_LOAD_DWORD killed %6, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.p)
 ...
 )MIR";

   MachineModuleInfo MMI(TM.get());
   M = parseMIR(*TM, MIRString, "test0", MMI);
   ASSERT_TRUE(M);

   auto *MF = MMI.getMachineFunction(*M->getFunction("test0"));
   auto *MBB = MF->getBlockNumbered(0);

   auto &MI = MBB->back();
   ASSERT_FALSE(MI.memoperands_empty());
   ASSERT_TRUE(MI.hasOneMemOperand());

   // Create and attached scoped AA metadata on that instruction with one MMO.
   MDBuilder MDB(Context);
   MDNode *Domain = MDB.createAnonymousAliasScopeDomain("domain");
   MDNode *Scope0 = MDB.createAnonymousAliasScope(Domain, "scope0");
   MDNode *Scope1 = MDB.createAnonymousAliasScope(Domain, "scope1");
   MDNode *Set0 = MDNode::get(Context, {Scope0});
   MDNode *Set1 = MDNode::get(Context, {Scope1});

   AAMDNodes AAInfo;
   AAInfo.TBAA = AAInfo.TBAAStruct = nullptr;
   AAInfo.Scope = Set0;
   AAInfo.NoAlias = Set1;

   auto *OldMMO = MI.memoperands().front();
   auto *NewMMO = MF->getMachineMemOperand(OldMMO, AAInfo);
   MI.setMemRefs(*MF, NewMMO);

   MachineModuleSlotTracker MST(MF);
   // Print that MI with new machine metadata, which slot numbers should be
   // assigned.
   EXPECT_EQ(
       "%5:vgpr_32 = FLAT_LOAD_DWORD killed %4, 0, 0, implicit $exec, implicit "
       "$flat_scr :: (load (s32) from %ir.p, !alias.scope !0, !noalias !3)",
       print([&](raw_ostream &OS) {
         MI.print(OS, MST, /*IsStandalone=*/false, /*SkipOpers=*/false,
                  /*SkipDebugLoc=*/false, /*AddNewLine=*/false);
       }));

   std::vector<const MDNode *> Generated{Domain, Scope0, Scope1, Set0, Set1};
   // Examine machine metadata collected. They should match ones
   // afore-generated.
   std::vector<const MDNode *> Collected;
   MachineModuleSlotTracker::MachineMDNodeListType MDList;
   MST.collectMachineMDNodes(MDList);
   for (auto &MD : MDList)
     Collected.push_back(MD.second);

   llvm::sort(Generated);
   llvm::sort(Collected);
   EXPECT_EQ(Collected, Generated);

   // FileCheck the output from MIR printer.
   std::string Output = print([&](raw_ostream &OS) { printMIR(OS, *MF); });
   std::string CheckString = R"(
 CHECK: machineMetadataNodes:
 CHECK-DAG: ![[MMDOMAIN:[0-9]+]] = distinct !{!{{[0-9]+}}, !"domain"}
 CHECK-DAG: ![[MMSCOPE0:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope0"}
 CHECK-DAG: ![[MMSCOPE1:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope1"}
 CHECK-DAG: ![[MMSET0:[0-9]+]] = !{![[MMSCOPE0]]}
 CHECK-DAG: ![[MMSET1:[0-9]+]] = !{![[MMSCOPE1]]}
 CHECK: body:
 CHECK: %5:vgpr_32 = FLAT_LOAD_DWORD killed %4, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.p, !alias.scope ![[MMSET0]], !noalias ![[MMSET1]])
 )";
   EXPECT_TRUE(checkOutput(CheckString, Output));
 }

 TEST_F(MachineMetadataTest, TiedOpsRewritten) {
   auto TM = createTargetMachine(Triple::normalize("powerpc64--"), "", "");
   if (!TM)
     GTEST_SKIP();
   StringRef MIRString = R"MIR(
 ---
 name:            foo
 alignment:       16
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    16
 machineFunctionInfo: {}
 body:             |
   bb.0:
     liveins: $r3
     %0:gprc = COPY $r3
     %0 = RLWIMI killed %0, $r3, 1, 0, 30
     $r3 = COPY %0
     BLR8 implicit $r3, implicit $lr8, implicit $rm

 ...
 )MIR";
   MachineModuleInfo MMI(TM.get());
   M = parseMIR(*TM, MIRString, "foo", MMI);
   ASSERT_TRUE(M);
   auto *MF = MMI.getMachineFunction(*M->getFunction("foo"));
   MachineFunctionProperties &Properties = MF->getProperties();
   ASSERT_TRUE(Properties.hasProperty(
       MachineFunctionProperties::Property::TiedOpsRewritten));
 }

 TEST_F(MachineMetadataTest, NoTiedOpsRewritten) {
   auto TM = createTargetMachine(Triple::normalize("powerpc64--"), "", "");
   if (!TM)
     GTEST_SKIP();
   StringRef MIRString = R"MIR(
 ---
 name:            foo
 alignment:       16
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    16
 machineFunctionInfo: {}
 body:             |
   bb.0:
     liveins: $r3
     %0:gprc = COPY $r3
     %1:gprc = RLWIMI killed %0, $r3, 1, 0, 30
     $r3 = COPY %1
     BLR8 implicit $r3, implicit $lr8, implicit $rm

 ...
 )MIR";
   MachineModuleInfo MMI(TM.get());
   M = parseMIR(*TM, MIRString, "foo", MMI);
   ASSERT_TRUE(M);
   auto *MF = MMI.getMachineFunction(*M->getFunction("foo"));
   MachineFunctionProperties &Properties = MF->getProperties();
   ASSERT_FALSE(Properties.hasProperty(
       MachineFunctionProperties::Property::TiedOpsRewritten));
 }
	//===- MachineInstrBundleIteratorTest.cpp ---------------------------------===//
	//
	// 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/ADT/STLExtras.h"
	#include "llvm/CodeGen/MIRParser/MIRParser.h"
	#include "llvm/CodeGen/MIRPrinter.h"
	#include "llvm/CodeGen/MachineFunction.h"
	#include "llvm/CodeGen/MachineMemOperand.h"
	#include "llvm/CodeGen/MachineModuleInfo.h"
	#include "llvm/CodeGen/MachineModuleSlotTracker.h"
	#include "llvm/CodeGen/MachineOperand.h"
	#include "llvm/CodeGen/TargetFrameLowering.h"
	#include "llvm/CodeGen/TargetInstrInfo.h"
	#include "llvm/CodeGen/TargetLowering.h"
	#include "llvm/CodeGen/TargetSubtargetInfo.h"
	#include "llvm/FileCheck/FileCheck.h"
	#include "llvm/IR/MDBuilder.h"
	#include "llvm/IR/ModuleSlotTracker.h"
	#include "llvm/MC/MCAsmInfo.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 MachineMetadataTest : public testing::Test {
	public:
	MachineMetadataTest() {}

	protected:
	LLVMContext Context;
	std::unique_ptr<Module> M;
	std::unique_ptr<MIRParser> MIR;

	static void SetUpTestCase() {
	InitializeAllTargetInfos();
	InitializeAllTargets();
	InitializeAllTargetMCs();
	}

	void SetUp() override { M = std::make_unique<Module>("Dummy", Context); }

	void addHooks(ModuleSlotTracker &MST, const MachineOperand &MO) {
	// Setup hooks to assign slot numbers for the specified machine metadata.
	MST.setProcessHook([&MO](AbstractSlotTrackerStorage AST, const Module M,
	bool ShouldInitializeAllMetadata) {
	if (ShouldInitializeAllMetadata) {
	if (MO.isMetadata())
	AST->createMetadataSlot(MO.getMetadata());
	}
	});
	MST.setProcessHook([&MO](AbstractSlotTrackerStorage AST, const Function F,
	bool ShouldInitializeAllMetadata) {
	if (!ShouldInitializeAllMetadata) {
	if (MO.isMetadata())
	AST->createMetadataSlot(MO.getMetadata());
	}
	});
	}

	std::unique_ptr<LLVMTargetMachine>
	createTargetMachine(std::string TT, StringRef CPU, StringRef FS) {
	std::string Error;
	const Target *T = TargetRegistry::lookupTarget(TT, Error);
	if (!T)
	return nullptr;
	TargetOptions Options;
	return std::unique_ptr<LLVMTargetMachine>(
	static_cast<LLVMTargetMachine *>(T->createTargetMachine(
	TT, CPU, FS, Options, std::nullopt, std::nullopt)));
	}

	std::unique_ptr<Module> parseMIR(const TargetMachine &TM, StringRef MIRCode,
	const char *FnName, MachineModuleInfo &MMI) {
	SMDiagnostic Diagnostic;
	std::unique_ptr<MemoryBuffer> MBuffer = MemoryBuffer::getMemBuffer(MIRCode);
	MIR = createMIRParser(std::move(MBuffer), Context);
	if (!MIR)
	return nullptr;

	std::unique_ptr<Module> Mod = MIR->parseIRModule();
	if (!Mod)
	return nullptr;

	Mod->setDataLayout(TM.createDataLayout());

	if (MIR->parseMachineFunctions(*Mod, MMI)) {
	M.reset();
	return nullptr;
	}

	return Mod;
	}
	};

	// Helper to dump the printer output into a string.
	static std::string print(std::function<void(raw_ostream &OS)> PrintFn) {
	std::string Str;
	raw_string_ostream OS(Str);
	PrintFn(OS);
	OS.flush();
	return Str;
	}

	TEST_F(MachineMetadataTest, TrivialHook) {
	// Verify that post-process hook is invoked to assign slot numbers for
	// machine metadata.
	ASSERT_TRUE(M);

	// Create a MachineOperand with a metadata and print it.
	Metadata *MDS = MDString::get(Context, "foo");
	MDNode *Node = MDNode::get(Context, MDS);
	MachineOperand MO = MachineOperand::CreateMetadata(Node);

	// Checking some preconditions on the newly created
	// MachineOperand.
	ASSERT_TRUE(MO.isMetadata());
	ASSERT_EQ(MO.getMetadata(), Node);

	ModuleSlotTracker MST(M.get());
	addHooks(MST, MO);

	// Print a MachineOperand containing a metadata node.
	EXPECT_EQ("!0", print([&](raw_ostream &OS) {
	MO.print(OS, MST, LLT{}, /OpIdx/ ~0U, /PrintDef=/false,
	/IsStandalone=/false,
	/ShouldPrintRegisterTies=/false, /TiedOperandIdx=/0,
	/TRI=/nullptr,
	/IntrinsicInfo=/nullptr);
	}));
	// Print the definition of that metadata node.
	EXPECT_EQ("!0 = !{!\"foo\"}",
	print([&](raw_ostream &OS) { Node->print(OS, MST); }));
	}

	TEST_F(MachineMetadataTest, BasicHook) {
	// Verify that post-process hook is invoked to assign slot numbers for
	// machine metadata. When both LLVM IR and machine IR contain metadata,
	// ensure that machine metadata is always assigned after LLVM IR.
	ASSERT_TRUE(M);

	// Create a MachineOperand with a metadata and print it.
	Metadata *MachineMDS = MDString::get(Context, "foo");
	MDNode *MachineNode = MDNode::get(Context, MachineMDS);
	MachineOperand MO = MachineOperand::CreateMetadata(MachineNode);

	// Checking some preconditions on the newly created
	// MachineOperand.
	ASSERT_TRUE(MO.isMetadata());
	ASSERT_EQ(MO.getMetadata(), MachineNode);

	// Create metadata in LLVM IR.
	NamedMDNode *MD = M->getOrInsertNamedMetadata("namedmd");
	Metadata *MDS = MDString::get(Context, "bar");
	MDNode *Node = MDNode::get(Context, MDS);
	MD->addOperand(Node);

	ModuleSlotTracker MST(M.get());
	addHooks(MST, MO);

	// Print a MachineOperand containing a metadata node.
	EXPECT_EQ("!1", print([&](raw_ostream &OS) {
	MO.print(OS, MST, LLT{}, /OpIdx/ ~0U, /PrintDef=/false,
	/IsStandalone=/false,
	/ShouldPrintRegisterTies=/false, /TiedOperandIdx=/0,
	/TRI=/nullptr,
	/IntrinsicInfo=/nullptr);
	}));
	// Print the definition of these unnamed metadata nodes.
	EXPECT_EQ("!0 = !{!\"bar\"}",
	print([&](raw_ostream &OS) { Node->print(OS, MST); }));
	EXPECT_EQ("!1 = !{!\"foo\"}",
	print([&](raw_ostream &OS) { MachineNode->print(OS, MST); }));
	}

	static bool checkOutput(std::string CheckString, std::string Output) {
	auto CheckBuffer = MemoryBuffer::getMemBuffer(CheckString, "");
	auto OutputBuffer = MemoryBuffer::getMemBuffer(Output, "Output", false);

	SmallString<4096> CheckFileBuffer;
	FileCheckRequest Req;
	FileCheck FC(Req);
	StringRef CheckFileText =
	FC.CanonicalizeFile(*CheckBuffer.get(), CheckFileBuffer);

	SourceMgr SM;
	SM.AddNewSourceBuffer(MemoryBuffer::getMemBuffer(CheckFileText, "CheckFile"),
	SMLoc());
	Regex PrefixRE = FC.buildCheckPrefixRegex();
	if (FC.readCheckFile(SM, CheckFileText, PrefixRE))
	return false;

	auto OutBuffer = OutputBuffer->getBuffer();
	SM.AddNewSourceBuffer(std::move(OutputBuffer), SMLoc());
	return FC.checkInput(SM, OutBuffer);
	}

	TEST_F(MachineMetadataTest, MMSlotTrackerAArch64) {
	auto TM = createTargetMachine(Triple::normalize("aarch64--"), "", "");
	if (!TM)
	GTEST_SKIP();

	StringRef MIRString = R"MIR(
	--- \|
	define i32 @test0(i32* %p) {
	%r = load i32, i32* %p, align 4
	ret i32 %r
	}
	...
	---
	name: test0
	liveins:
	- { reg: '$x0', virtual-reg: '%0' }
	body: \|
	bb.0 (%ir-block.0):
	liveins: $x0

	%0:gpr64common = COPY $x0
	%1:gpr32 = LDRWui %0, 0 :: (load (s32) from %ir.p)
	...
	)MIR";

	MachineModuleInfo MMI(TM.get());
	M = parseMIR(*TM, MIRString, "test0", MMI);
	ASSERT_TRUE(M);

	auto MF = MMI.getMachineFunction(M->getFunction("test0"));
	auto *MBB = MF->getBlockNumbered(0);

	auto &MI = MBB->back();
	ASSERT_TRUE(MI.hasOneMemOperand());

	// Create and attached scoped AA metadata on that instruction with one MMO.
	MDBuilder MDB(Context);
	MDNode *Domain = MDB.createAnonymousAliasScopeDomain("domain");
	MDNode *Scope0 = MDB.createAnonymousAliasScope(Domain, "scope0");
	MDNode *Scope1 = MDB.createAnonymousAliasScope(Domain, "scope1");
	MDNode *Set0 = MDNode::get(Context, {Scope0});
	MDNode *Set1 = MDNode::get(Context, {Scope1});

	AAMDNodes AAInfo;
	AAInfo.TBAA = AAInfo.TBAAStruct = nullptr;
	AAInfo.Scope = Set0;
	AAInfo.NoAlias = Set1;

	auto *OldMMO = MI.memoperands().front();
	auto *NewMMO = MF->getMachineMemOperand(OldMMO, AAInfo);
	MI.setMemRefs(*MF, NewMMO);

	MachineModuleSlotTracker MST(MF);
	// Print that MI with new machine metadata, which slot numbers should be
	// assigned.
	EXPECT_EQ("%1:gpr32 = LDRWui %0, 0 :: (load (s32) from %ir.p, "
	"!alias.scope !0, !noalias !3)",
	print([&](raw_ostream &OS) {
	MI.print(OS, MST, /IsStandalone=/false, /SkipOpers=/false,
	/SkipDebugLoc=/false, /AddNewLine=/false);
	}));

	std::vector<const MDNode *> Generated{Domain, Scope0, Scope1, Set0, Set1};
	// Examine machine metadata collected. They should match ones
	// afore-generated.
	std::vector<const MDNode *> Collected;
	MachineModuleSlotTracker::MachineMDNodeListType MDList;
	MST.collectMachineMDNodes(MDList);
	for (auto &MD : MDList)
	Collected.push_back(MD.second);

	llvm::sort(Generated);
	llvm::sort(Collected);
	EXPECT_EQ(Collected, Generated);

	// FileCheck the output from MIR printer.
	std::string Output = print([&](raw_ostream &OS) { printMIR(OS, *MF); });
	std::string CheckString = R"(
	CHECK: machineMetadataNodes:
	CHECK-DAG: ![[MMDOMAIN:[0-9]+]] = distinct !{!{{[0-9]+}}, !"domain"}
	CHECK-DAG: ![[MMSCOPE0:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope0"}
	CHECK-DAG: ![[MMSCOPE1:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope1"}
	CHECK-DAG: ![[MMSET0:[0-9]+]] = !{![[MMSCOPE0]]}
	CHECK-DAG: ![[MMSET1:[0-9]+]] = !{![[MMSCOPE1]]}
	CHECK: body:
	CHECK: %1:gpr32 = LDRWui %0, 0 :: (load (s32) from %ir.p, !alias.scope ![[MMSET0]], !noalias ![[MMSET1]])
	)";
	EXPECT_TRUE(checkOutput(CheckString, Output));
	}

	TEST_F(MachineMetadataTest, isMetaInstruction) {
	auto TM = createTargetMachine(Triple::normalize("x86_64--"), "", "");
	if (!TM)
	GTEST_SKIP();

	StringRef MIRString = R"MIR(
	--- \|
	define void @test0(i32 %b) {
	ret void
	}
	!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
	!1 = !DIFile(filename: "a.c", directory: "/tmp")
	!2 = !{i32 7, !"Dwarf Version", i32 4}
	!3 = !{i32 2, !"Debug Info Version", i32 3}
	!4 = !{i32 1, !"wchar_size", i32 4}
	!5 = !{i32 7, !"uwtable", i32 1}
	!6 = !{i32 7, !"frame-pointer", i32 2}
	!7 = !{!""}
	!8 = distinct !DISubprogram(name: "test0", scope: !1, file: !1, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !12)
	!9 = !DISubroutineType(types: !10)
	!10 = !{null, !11}
	!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
	!12 = !{}
	!13 = !DILocalVariable(name: "b", arg: 1, scope: !8, file: !1, line: 1, type: !11)
	!14 = !DILocation(line: 1, column: 16, scope: !8)
	...
	---
	name: test0
	machineFunctionInfo
	body: \|
	bb.0:
	$rdi = IMPLICIT_DEF
	KILL $rsi
	CFI_INSTRUCTION undefined $rax
	EH_LABEL 0
	GC_LABEL 0
	DBG_VALUE $rax, $noreg, !13, !DIExpression(), debug-location !14
	DBG_LABEL 0
	LIFETIME_START 0
	LIFETIME_END 0
	PSEUDO_PROBE 6699318081062747564, 1, 0, 0
	$xmm0 = ARITH_FENCE $xmm0
	MEMBARRIER
	...
	)MIR";

	MachineModuleInfo MMI(TM.get());
	M = parseMIR(*TM, MIRString, "test0", MMI);
	ASSERT_TRUE(M);

	auto MF = MMI.getMachineFunction(M->getFunction("test0"));
	auto *MBB = MF->getBlockNumbered(0);

	for (auto It = MBB->begin(); It != MBB->end(); ++It) {
	MachineInstr &MI = *It;
	ASSERT_TRUE(MI.isMetaInstruction());
	}
	}

	TEST_F(MachineMetadataTest, MMSlotTrackerX64) {
	auto TM = createTargetMachine(Triple::normalize("x86_64--"), "", "");
	if (!TM)
	GTEST_SKIP();

	StringRef MIRString = R"MIR(
	--- \|
	define i32 @test0(i32* %p) {
	%r = load i32, i32* %p, align 4
	ret i32 %r
	}
	...
	---
	name: test0
	liveins:
	- { reg: '$rdi', virtual-reg: '%0' }
	body: \|
	bb.0 (%ir-block.0):
	liveins: $rdi

	%0:gr64 = COPY $rdi
	%1:gr32 = MOV32rm %0, 1, $noreg, 0, $noreg :: (load (s32) from %ir.p)
	...
	)MIR";

	MachineModuleInfo MMI(TM.get());
	M = parseMIR(*TM, MIRString, "test0", MMI);
	ASSERT_TRUE(M);

	auto MF = MMI.getMachineFunction(M->getFunction("test0"));
	auto *MBB = MF->getBlockNumbered(0);

	auto &MI = MBB->back();
	ASSERT_FALSE(MI.memoperands_empty());
	ASSERT_TRUE(MI.hasOneMemOperand());

	// Create and attached scoped AA metadata on that instruction with one MMO.
	MDBuilder MDB(Context);
	MDNode *Domain = MDB.createAnonymousAliasScopeDomain("domain");
	MDNode *Scope0 = MDB.createAnonymousAliasScope(Domain, "scope0");
	MDNode *Scope1 = MDB.createAnonymousAliasScope(Domain, "scope1");
	MDNode *Set0 = MDNode::get(Context, {Scope0});
	MDNode *Set1 = MDNode::get(Context, {Scope1});

	AAMDNodes AAInfo;
	AAInfo.TBAA = AAInfo.TBAAStruct = nullptr;
	AAInfo.Scope = Set0;
	AAInfo.NoAlias = Set1;

	auto *OldMMO = MI.memoperands().front();
	auto *NewMMO = MF->getMachineMemOperand(OldMMO, AAInfo);
	MI.setMemRefs(*MF, NewMMO);

	MachineModuleSlotTracker MST(MF);
	// Print that MI with new machine metadata, which slot numbers should be
	// assigned.
	EXPECT_EQ("%1:gr32 = MOV32rm %0, 1, $noreg, 0, $noreg :: (load (s32) from %ir.p, "
	"!alias.scope !0, !noalias !3)",
	print([&](raw_ostream &OS) {
	MI.print(OS, MST, /IsStandalone=/false, /SkipOpers=/false,
	/SkipDebugLoc=/false, /AddNewLine=/false);
	}));

	std::vector<const MDNode *> Generated{Domain, Scope0, Scope1, Set0, Set1};
	// Examine machine metadata collected. They should match ones
	// afore-generated.
	std::vector<const MDNode *> Collected;
	MachineModuleSlotTracker::MachineMDNodeListType MDList;
	MST.collectMachineMDNodes(MDList);
	for (auto &MD : MDList)
	Collected.push_back(MD.second);

	llvm::sort(Generated);
	llvm::sort(Collected);
	EXPECT_EQ(Collected, Generated);

	// FileCheck the output from MIR printer.
	std::string Output = print([&](raw_ostream &OS) { printMIR(OS, *MF); });
	std::string CheckString = R"(
	CHECK: machineMetadataNodes:
	CHECK-DAG: ![[MMDOMAIN:[0-9]+]] = distinct !{!{{[0-9]+}}, !"domain"}
	CHECK-DAG: ![[MMSCOPE0:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope0"}
	CHECK-DAG: ![[MMSCOPE1:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope1"}
	CHECK-DAG: ![[MMSET0:[0-9]+]] = !{![[MMSCOPE0]]}
	CHECK-DAG: ![[MMSET1:[0-9]+]] = !{![[MMSCOPE1]]}
	CHECK: body:
	CHECK: %1:gr32 = MOV32rm %0, 1, $noreg, 0, $noreg :: (load (s32) from %ir.p, !alias.scope ![[MMSET0]], !noalias ![[MMSET1]])
	)";
	EXPECT_TRUE(checkOutput(CheckString, Output));
	}

	TEST_F(MachineMetadataTest, MMSlotTrackerAMDGPU) {
	auto TM = createTargetMachine(Triple::normalize("amdgcn-amd-amdhsa"),
	"gfx1010", "");
	if (!TM)
	GTEST_SKIP();

	StringRef MIRString = R"MIR(
	--- \|
	define i32 @test0(i32* %p) {
	%r = load i32, i32* %p, align 4
	ret i32 %r
	}
	...
	---
	name: test0
	liveins:
	- { reg: '$vgpr0', virtual-reg: '%0' }
	- { reg: '$vgpr1', virtual-reg: '%1' }
	- { reg: '$sgpr30_sgpr31', virtual-reg: '%2' }
	body: \|
	bb.0 (%ir-block.0):
	liveins: $vgpr0, $vgpr1, $sgpr30_sgpr31

	%2:sreg_64 = COPY $sgpr30_sgpr31
	%1:vgpr_32 = COPY $vgpr1
	%0:vgpr_32 = COPY $vgpr0
	%8:vreg_64 = REG_SEQUENCE %0, %subreg.sub0, %1, %subreg.sub1
	%6:vreg_64 = COPY %8
	%5:vgpr_32 = FLAT_LOAD_DWORD killed %6, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.p)
	...
	)MIR";

	MachineModuleInfo MMI(TM.get());
	M = parseMIR(*TM, MIRString, "test0", MMI);
	ASSERT_TRUE(M);

	auto MF = MMI.getMachineFunction(M->getFunction("test0"));
	auto *MBB = MF->getBlockNumbered(0);

	auto &MI = MBB->back();
	ASSERT_FALSE(MI.memoperands_empty());
	ASSERT_TRUE(MI.hasOneMemOperand());

	// Create and attached scoped AA metadata on that instruction with one MMO.
	MDBuilder MDB(Context);
	MDNode *Domain = MDB.createAnonymousAliasScopeDomain("domain");
	MDNode *Scope0 = MDB.createAnonymousAliasScope(Domain, "scope0");
	MDNode *Scope1 = MDB.createAnonymousAliasScope(Domain, "scope1");
	MDNode *Set0 = MDNode::get(Context, {Scope0});
	MDNode *Set1 = MDNode::get(Context, {Scope1});

	AAMDNodes AAInfo;
	AAInfo.TBAA = AAInfo.TBAAStruct = nullptr;
	AAInfo.Scope = Set0;
	AAInfo.NoAlias = Set1;

	auto *OldMMO = MI.memoperands().front();
	auto *NewMMO = MF->getMachineMemOperand(OldMMO, AAInfo);
	MI.setMemRefs(*MF, NewMMO);

	MachineModuleSlotTracker MST(MF);
	// Print that MI with new machine metadata, which slot numbers should be
	// assigned.
	EXPECT_EQ(
	"%5:vgpr_32 = FLAT_LOAD_DWORD killed %4, 0, 0, implicit $exec, implicit "
	"$flat_scr :: (load (s32) from %ir.p, !alias.scope !0, !noalias !3)",
	print([&](raw_ostream &OS) {
	MI.print(OS, MST, /IsStandalone=/false, /SkipOpers=/false,
	/SkipDebugLoc=/false, /AddNewLine=/false);
	}));

	std::vector<const MDNode *> Generated{Domain, Scope0, Scope1, Set0, Set1};
	// Examine machine metadata collected. They should match ones
	// afore-generated.
	std::vector<const MDNode *> Collected;
	MachineModuleSlotTracker::MachineMDNodeListType MDList;
	MST.collectMachineMDNodes(MDList);
	for (auto &MD : MDList)
	Collected.push_back(MD.second);

	llvm::sort(Generated);
	llvm::sort(Collected);
	EXPECT_EQ(Collected, Generated);

	// FileCheck the output from MIR printer.
	std::string Output = print([&](raw_ostream &OS) { printMIR(OS, *MF); });
	std::string CheckString = R"(
	CHECK: machineMetadataNodes:
	CHECK-DAG: ![[MMDOMAIN:[0-9]+]] = distinct !{!{{[0-9]+}}, !"domain"}
	CHECK-DAG: ![[MMSCOPE0:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope0"}
	CHECK-DAG: ![[MMSCOPE1:[0-9]+]] = distinct !{!{{[0-9]+}}, ![[MMDOMAIN]], !"scope1"}
	CHECK-DAG: ![[MMSET0:[0-9]+]] = !{![[MMSCOPE0]]}
	CHECK-DAG: ![[MMSET1:[0-9]+]] = !{![[MMSCOPE1]]}
	CHECK: body:
	CHECK: %5:vgpr_32 = FLAT_LOAD_DWORD killed %4, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.p, !alias.scope ![[MMSET0]], !noalias ![[MMSET1]])
	)";
	EXPECT_TRUE(checkOutput(CheckString, Output));
	}

	TEST_F(MachineMetadataTest, TiedOpsRewritten) {
	auto TM = createTargetMachine(Triple::normalize("powerpc64--"), "", "");
	if (!TM)
	GTEST_SKIP();
	StringRef MIRString = R"MIR(
	---
	name: foo
	alignment: 16
	tracksRegLiveness: true
	frameInfo:
	maxAlignment: 16
	machineFunctionInfo: {}
	body: \|
	bb.0:
	liveins: $r3
	%0:gprc = COPY $r3
	%0 = RLWIMI killed %0, $r3, 1, 0, 30
	$r3 = COPY %0
	BLR8 implicit $r3, implicit $lr8, implicit $rm

	...
	)MIR";
	MachineModuleInfo MMI(TM.get());
	M = parseMIR(*TM, MIRString, "foo", MMI);
	ASSERT_TRUE(M);
	auto MF = MMI.getMachineFunction(M->getFunction("foo"));
	MachineFunctionProperties &Properties = MF->getProperties();
	ASSERT_TRUE(Properties.hasProperty(
	MachineFunctionProperties::Property::TiedOpsRewritten));
	}

	TEST_F(MachineMetadataTest, NoTiedOpsRewritten) {
	auto TM = createTargetMachine(Triple::normalize("powerpc64--"), "", "");
	if (!TM)
	GTEST_SKIP();
	StringRef MIRString = R"MIR(
	---
	name: foo
	alignment: 16
	tracksRegLiveness: true
	frameInfo:
	maxAlignment: 16
	machineFunctionInfo: {}
	body: \|
	bb.0:
	liveins: $r3
	%0:gprc = COPY $r3
	%1:gprc = RLWIMI killed %0, $r3, 1, 0, 30
	$r3 = COPY %1
	BLR8 implicit $r3, implicit $lr8, implicit $rm

	...
	)MIR";
	MachineModuleInfo MMI(TM.get());
	M = parseMIR(*TM, MIRString, "foo", MMI);
	ASSERT_TRUE(M);
	auto MF = MMI.getMachineFunction(M->getFunction("foo"));
	MachineFunctionProperties &Properties = MF->getProperties();
	ASSERT_FALSE(Properties.hasProperty(
	MachineFunctionProperties::Property::TiedOpsRewritten));
	}