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 //===-- Passes.h - Target independent code generation passes ----*- C++ -*-===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines interfaces to access the target independent code generation
 // passes provided by the LLVM backend.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_PASSES_H
 #define LLVM_CODEGEN_PASSES_H
 
 #include "llvm/Support/CodeGen.h"
 #include "llvm/Support/Discriminator.h"
 #include "llvm/CodeGen/RegAllocCommon.h"
 
 #include <functional>
 #include <string>
 
 namespace llvm {
 
 class FunctionPass;
 class MachineFunction;
 class MachineFunctionPass;
 class ModulePass;
 class Pass;
 class TargetMachine;
 class raw_ostream;
 
 template <typename T> class IntrusiveRefCntPtr;
 namespace vfs {
 class FileSystem;
 } // namespace vfs
 
 } // End llvm namespace
 
 // List of target independent CodeGen pass IDs.
 namespace llvm {
 
   /// AtomicExpandPass - At IR level this pass replace atomic instructions with
   /// __atomic_* library calls, or target specific instruction which implement the
   /// same semantics in a way which better fits the target backend.
   FunctionPass *createAtomicExpandLegacyPass();
 
   /// createUnreachableBlockEliminationPass - The LLVM code generator does not
   /// work well with unreachable basic blocks (what live ranges make sense for a
   /// block that cannot be reached?).  As such, a code generator should either
   /// not instruction select unreachable blocks, or run this pass as its
   /// last LLVM modifying pass to clean up blocks that are not reachable from
   /// the entry block.
   FunctionPass *createUnreachableBlockEliminationPass();
 
   /// createGCEmptyBasicblocksPass - Empty basic blocks (basic blocks without
   /// real code) appear as the result of optimization passes removing
   /// instructions. These blocks confuscate profile analysis (e.g., basic block
   /// sections) since they will share the address of their fallthrough blocks.
   /// This pass garbage-collects such basic blocks.
   MachineFunctionPass *createGCEmptyBasicBlocksPass();
 
   /// createBasicBlockSections Pass - This pass assigns sections to machine
   /// basic blocks and is enabled with -fbasic-block-sections.
   MachineFunctionPass *createBasicBlockSectionsPass();
 
   MachineFunctionPass *createBasicBlockPathCloningPass();
 
   /// createMachineFunctionSplitterPass - This pass splits machine functions
   /// using profile information.
   MachineFunctionPass *createMachineFunctionSplitterPass();
 
   /// createStaticDataSplitterPass - This pass partitions a static data section
   /// into a hot and cold section using profile information.
   MachineFunctionPass *createStaticDataSplitterPass();
 
   /// MachineFunctionPrinter pass - This pass prints out the machine function to
   /// the given stream as a debugging tool.
   MachineFunctionPass *
   createMachineFunctionPrinterPass(raw_ostream &OS,
                                    const std::string &Banner ="");
 
   /// StackFramePrinter pass - This pass prints out the machine function's
   /// stack frame to the given stream as a debugging tool.
   MachineFunctionPass *createStackFrameLayoutAnalysisPass();
 
   /// MIRPrinting pass - this pass prints out the LLVM IR into the given stream
   /// using the MIR serialization format.
   MachineFunctionPass *createPrintMIRPass(raw_ostream &OS);
 
   /// This pass resets a MachineFunction when it has the FailedISel property
   /// as if it was just created.
   /// If EmitFallbackDiag is true, the pass will emit a
   /// DiagnosticInfoISelFallback for every MachineFunction it resets.
   /// If AbortOnFailedISel is true, abort compilation instead of resetting.
   MachineFunctionPass *createResetMachineFunctionPass(bool EmitFallbackDiag,
                                                       bool AbortOnFailedISel);
 
   /// createCodeGenPrepareLegacyPass - Transform the code to expose more pattern
   /// matching during instruction selection.
   FunctionPass *createCodeGenPrepareLegacyPass();
 
   /// This pass implements generation of target-specific intrinsics to support
   /// handling of complex number arithmetic
   FunctionPass *createComplexDeinterleavingPass(const TargetMachine *TM);
 
   /// AtomicExpandID -- Lowers atomic operations in terms of either cmpxchg
   /// load-linked/store-conditional loops.
   extern char &AtomicExpandID;
 
   /// MachineLoopInfo - This pass is a loop analysis pass.
   extern char &MachineLoopInfoID;
 
   /// MachineDominators - This pass is a machine dominators analysis pass.
   extern char &MachineDominatorsID;
 
   /// MachineDominanaceFrontier - This pass is a machine dominators analysis.
   extern char &MachineDominanceFrontierID;
 
   /// MachineRegionInfo - This pass computes SESE regions for machine functions.
   extern char &MachineRegionInfoPassID;
 
   /// EdgeBundles analysis - Bundle machine CFG edges.
   extern char &EdgeBundlesWrapperLegacyID;
 
   /// LiveVariables pass - This pass computes the set of blocks in which each
   /// variable is life and sets machine operand kill flags.
   extern char &LiveVariablesID;
 
   /// PHIElimination - This pass eliminates machine instruction PHI nodes
   /// by inserting copy instructions.  This destroys SSA information, but is the
   /// desired input for some register allocators.  This pass is "required" by
   /// these register allocator like this: AU.addRequiredID(PHIEliminationID);
   extern char &PHIEliminationID;
 
   /// LiveIntervals - This analysis keeps track of the live ranges of virtual
   /// and physical registers.
   extern char &LiveIntervalsID;
 
   /// LiveStacks pass. An analysis keeping track of the liveness of stack slots.
   extern char &LiveStacksID;
 
   /// TwoAddressInstruction - This pass reduces two-address instructions to
   /// use two operands. This destroys SSA information but it is desired by
   /// register allocators.
   extern char &TwoAddressInstructionPassID;
 
   /// ProcessImpicitDefs pass - This pass removes IMPLICIT_DEFs.
   extern char &ProcessImplicitDefsID;
 
   /// RegisterCoalescer - This pass merges live ranges to eliminate copies.
   extern char &RegisterCoalescerID;
 
   /// MachineScheduler - This pass schedules machine instructions.
   extern char &MachineSchedulerID;
 
   /// PostMachineScheduler - This pass schedules machine instructions postRA.
   extern char &PostMachineSchedulerID;
 
   /// SpillPlacement analysis. Suggest optimal placement of spill code between
   /// basic blocks.
   extern char &SpillPlacementID;
 
   /// ShrinkWrap pass. Look for the best place to insert save and restore
   // instruction and update the MachineFunctionInfo with that information.
   extern char &ShrinkWrapID;
 
   /// LiveRangeShrink pass. Move instruction close to its definition to shrink
   /// the definition's live range.
   extern char &LiveRangeShrinkID;
 
   /// Greedy register allocator.
   extern char &RAGreedyID;
 
   /// Basic register allocator.
   extern char &RABasicID;
 
   /// VirtRegRewriter pass. Rewrite virtual registers to physical registers as
   /// assigned in VirtRegMap.
   extern char &VirtRegRewriterID;
   FunctionPass *createVirtRegRewriter(bool ClearVirtRegs = true);
 
   /// UnreachableMachineBlockElimination - This pass removes unreachable
   /// machine basic blocks.
   extern char &UnreachableMachineBlockElimID;
 
   /// DeadMachineInstructionElim - This pass removes dead machine instructions.
   extern char &DeadMachineInstructionElimID;
 
   /// This pass adds dead/undef flags after analyzing subregister lanes.
   extern char &DetectDeadLanesID;
 
   /// This pass perform post-ra machine sink for COPY instructions.
   extern char &PostRAMachineSinkingID;
 
   /// This pass adds flow sensitive discriminators.
   extern char &MIRAddFSDiscriminatorsID;
 
   /// This pass reads flow sensitive profile.
   extern char &MIRProfileLoaderPassID;
 
   // This pass gives undef values a Pseudo Instruction definition for
   // Instructions to ensure early-clobber is followed when using the greedy
   // register allocator.
   extern char &InitUndefID;
 
   /// FastRegisterAllocation Pass - This pass register allocates as fast as
   /// possible. It is best suited for debug code where live ranges are short.
   ///
   FunctionPass *createFastRegisterAllocator();
   FunctionPass *createFastRegisterAllocator(RegAllocFilterFunc F,
                                             bool ClearVirtRegs);
 
   /// BasicRegisterAllocation Pass - This pass implements a degenerate global
   /// register allocator using the basic regalloc framework.
   ///
   FunctionPass *createBasicRegisterAllocator();
   FunctionPass *createBasicRegisterAllocator(RegAllocFilterFunc F);
 
   /// Greedy register allocation pass - This pass implements a global register
   /// allocator for optimized builds.
   ///
   FunctionPass *createGreedyRegisterAllocator();
   FunctionPass *createGreedyRegisterAllocator(RegAllocFilterFunc F);
 
   /// PBQPRegisterAllocation Pass - This pass implements the Partitioned Boolean
   /// Quadratic Prograaming (PBQP) based register allocator.
   ///
   FunctionPass *createDefaultPBQPRegisterAllocator();
 
   /// PrologEpilogCodeInserter - This pass inserts prolog and epilog code,
   /// and eliminates abstract frame references.
   extern char &PrologEpilogCodeInserterID;
   MachineFunctionPass *createPrologEpilogInserterPass();
 
   /// ExpandPostRAPseudos - This pass expands pseudo instructions after
   /// register allocation.
   extern char &ExpandPostRAPseudosID;
 
   /// PostRAHazardRecognizer - This pass runs the post-ra hazard
   /// recognizer.
   extern char &PostRAHazardRecognizerID;
 
   /// PostRAScheduler - This pass performs post register allocation
   /// scheduling.
   extern char &PostRASchedulerID;
 
   /// BranchFolding - This pass performs machine code CFG based
   /// optimizations to delete branches to branches, eliminate branches to
   /// successor blocks (creating fall throughs), and eliminating branches over
   /// branches.
   extern char &BranchFolderPassID;
 
   /// BranchRelaxation - This pass replaces branches that need to jump further
   /// than is supported by a branch instruction.
   extern char &BranchRelaxationPassID;
 
   /// MachineFunctionPrinterPass - This pass prints out MachineInstr's.
   extern char &MachineFunctionPrinterPassID;
 
   /// MIRPrintingPass - this pass prints out the LLVM IR using the MIR
   /// serialization format.
   extern char &MIRPrintingPassID;
 
   /// TailDuplicate - Duplicate blocks with unconditional branches
   /// into tails of their predecessors.
   extern char &TailDuplicateLegacyID;
 
   /// Duplicate blocks with unconditional branches into tails of their
   /// predecessors. Variant that works before register allocation.
   extern char &EarlyTailDuplicateLegacyID;
 
   /// MachineTraceMetrics - This pass computes critical path and CPU resource
   /// usage in an ensemble of traces.
   extern char &MachineTraceMetricsID;
 
   /// EarlyIfConverter - This pass performs if-conversion on SSA form by
   /// inserting cmov instructions.
   extern char &EarlyIfConverterLegacyID;
 
   /// EarlyIfPredicator - This pass performs if-conversion on SSA form by
   /// predicating if/else block and insert select at the join point.
   extern char &EarlyIfPredicatorID;
 
   /// This pass performs instruction combining using trace metrics to estimate
   /// critical-path and resource depth.
   extern char &MachineCombinerID;
 
   /// StackSlotColoring - This pass performs stack coloring and merging.
   /// It merges disjoint allocas to reduce the stack size.
   extern char &StackColoringLegacyID;
 
   /// StackFramePrinter - This pass prints the stack frame layout and variable
   /// mappings.
   extern char &StackFrameLayoutAnalysisPassID;
 
   /// IfConverter - This pass performs machine code if conversion.
   extern char &IfConverterID;
 
   FunctionPass *createIfConverter(
       std::function<bool(const MachineFunction &)> Ftor);
 
   /// MachineBlockPlacement - This pass places basic blocks based on branch
   /// probabilities.
   extern char &MachineBlockPlacementID;
 
   /// MachineBlockPlacementStats - This pass collects statistics about the
   /// basic block placement using branch probabilities and block frequency
   /// information.
   extern char &MachineBlockPlacementStatsID;
 
   /// GCLowering Pass - Used by gc.root to perform its default lowering
   /// operations.
   FunctionPass *createGCLoweringPass();
 
   /// GCLowering Pass - Used by gc.root to perform its default lowering
   /// operations.
   extern char &GCLoweringID;
 
   /// ShadowStackGCLowering - Implements the custom lowering mechanism
   /// used by the shadow stack GC.  Only runs on functions which opt in to
   /// the shadow stack collector.
   FunctionPass *createShadowStackGCLoweringPass();
 
   /// ShadowStackGCLowering - Implements the custom lowering mechanism
   /// used by the shadow stack GC.
   extern char &ShadowStackGCLoweringID;
 
   /// GCMachineCodeAnalysis - Target-independent pass to mark safe points
   /// in machine code. Must be added very late during code generation, just
   /// prior to output, and importantly after all CFG transformations (such as
   /// branch folding).
   extern char &GCMachineCodeAnalysisID;
 
   /// MachineCSE - This pass performs global CSE on machine instructions.
   extern char &MachineCSELegacyID;
 
   /// MIRCanonicalizer - This pass canonicalizes MIR by renaming vregs
   /// according to the semantics of the instruction as well as hoists
   /// code.
   extern char &MIRCanonicalizerID;
 
   /// ImplicitNullChecks - This pass folds null pointer checks into nearby
   /// memory operations.
   extern char &ImplicitNullChecksID;
 
   /// This pass performs loop invariant code motion on machine instructions.
   extern char &MachineLICMID;
 
   /// This pass performs loop invariant code motion on machine instructions.
   /// This variant works before register allocation. \see MachineLICMID.
   extern char &EarlyMachineLICMID;
 
   /// MachineSinking - This pass performs sinking on machine instructions.
   extern char &MachineSinkingID;
 
   /// MachineCopyPropagation - This pass performs copy propagation on
   /// machine instructions.
   extern char &MachineCopyPropagationID;
 
   MachineFunctionPass *createMachineCopyPropagationPass(bool UseCopyInstr);
 
   /// MachineLateInstrsCleanup - This pass removes redundant identical
   /// instructions after register allocation and rematerialization.
   extern char &MachineLateInstrsCleanupID;
 
   /// PeepholeOptimizer - This pass performs peephole optimizations -
   /// like extension and comparison eliminations.
   extern char &PeepholeOptimizerLegacyID;
 
   /// OptimizePHIs - This pass optimizes machine instruction PHIs
   /// to take advantage of opportunities created during DAG legalization.
   extern char &OptimizePHIsLegacyID;
 
   /// StackSlotColoring - This pass performs stack slot coloring.
   extern char &StackSlotColoringID;
 
   /// This pass lays out funclets contiguously.
   extern char &FuncletLayoutID;
 
   /// This pass inserts the XRay instrumentation sleds if they are supported by
   /// the target platform.
   extern char &XRayInstrumentationID;
 
   /// This pass inserts FEntry calls
   extern char &FEntryInserterID;
 
   /// This pass implements the "patchable-function" attribute.
   extern char &PatchableFunctionID;
 
   /// createStackProtectorPass - This pass adds stack protectors to functions.
   ///
   FunctionPass *createStackProtectorPass();
 
   /// createMachineVerifierPass - This pass verifies cenerated machine code
   /// instructions for correctness.
   ///
   FunctionPass *createMachineVerifierPass(const std::string& Banner);
 
   /// createDwarfEHPass - This pass mulches exception handling code into a form
   /// adapted to code generation.  Required if using dwarf exception handling.
   FunctionPass *createDwarfEHPass(CodeGenOptLevel OptLevel);
 
   /// createWinEHPass - Prepares personality functions used by MSVC on Windows,
   /// in addition to the Itanium LSDA based personalities.
   FunctionPass *createWinEHPass(bool DemoteCatchSwitchPHIOnly = false);
 
   /// createSjLjEHPreparePass - This pass adapts exception handling code to use
   /// the GCC-style builtin setjmp/longjmp (sjlj) to handling EH control flow.
   ///
   FunctionPass *createSjLjEHPreparePass(const TargetMachine *TM);
 
   /// createWasmEHPass - This pass adapts exception handling code to use
   /// WebAssembly's exception handling scheme.
   FunctionPass *createWasmEHPass();
 
   /// LocalStackSlotAllocation - This pass assigns local frame indices to stack
   /// slots relative to one another and allocates base registers to access them
   /// when it is estimated by the target to be out of range of normal frame
   /// pointer or stack pointer index addressing.
   extern char &LocalStackSlotAllocationID;
 
   /// This pass expands pseudo-instructions, reserves registers and adjusts
   /// machine frame information.
   extern char &FinalizeISelID;
 
   /// UnpackMachineBundles - This pass unpack machine instruction bundles.
   extern char &UnpackMachineBundlesID;
 
   FunctionPass *
   createUnpackMachineBundles(std::function<bool(const MachineFunction &)> Ftor);
 
   /// FinalizeMachineBundles - This pass finalize machine instruction
   /// bundles (created earlier, e.g. during pre-RA scheduling).
   extern char &FinalizeMachineBundlesID;
 
   /// StackMapLiveness - This pass analyses the register live-out set of
   /// stackmap/patchpoint intrinsics and attaches the calculated information to
   /// the intrinsic for later emission to the StackMap.
   extern char &StackMapLivenessID;
 
   // MachineSanitizerBinaryMetadata - appends/finalizes sanitizer binary
   // metadata after llvm SanitizerBinaryMetadata pass.
   extern char &MachineSanitizerBinaryMetadataID;
 
   /// RemoveLoadsIntoFakeUses pass.
   extern char &RemoveLoadsIntoFakeUsesID;
 
   /// RemoveRedundantDebugValues pass.
   extern char &RemoveRedundantDebugValuesID;
 
   /// MachineCFGPrinter pass.
   extern char &MachineCFGPrinterID;
 
   /// LiveDebugValues pass
   extern char &LiveDebugValuesID;
 
   /// InterleavedAccess Pass - This pass identifies and matches interleaved
   /// memory accesses to target specific intrinsics.
   ///
   FunctionPass *createInterleavedAccessPass();
 
   /// InterleavedLoadCombines Pass - This pass identifies interleaved loads and
   /// combines them into wide loads detectable by InterleavedAccessPass
   ///
   FunctionPass *createInterleavedLoadCombinePass();
 
   /// LowerEmuTLS - This pass generates __emutls_[vt].xyz variables for all
   /// TLS variables for the emulated TLS model.
   ///
   ModulePass *createLowerEmuTLSPass();
 
   /// This pass lowers the \@llvm.load.relative and \@llvm.objc.* intrinsics to
   /// instructions.  This is unsafe to do earlier because a pass may combine the
   /// constant initializer into the load, which may result in an overflowing
   /// evaluation.
   ModulePass *createPreISelIntrinsicLoweringPass();
 
   /// GlobalMerge - This pass merges internal (by default) globals into structs
   /// to enable reuse of a base pointer by indexed addressing modes.
   /// It can also be configured to focus on size optimizations only.
   ///
   Pass *createGlobalMergePass(const TargetMachine *TM, unsigned MaximalOffset,
                               bool OnlyOptimizeForSize = false,
                               bool MergeExternalByDefault = false,
                               bool MergeConstantByDefault = false,
                               bool MergeConstAggressiveByDefault = false);
 
   /// This pass splits the stack into a safe stack and an unsafe stack to
   /// protect against stack-based overflow vulnerabilities.
   FunctionPass *createSafeStackPass();
 
   /// This pass detects subregister lanes in a virtual register that are used
   /// independently of other lanes and splits them into separate virtual
   /// registers.
   extern char &RenameIndependentSubregsID;
 
   /// This pass is executed POST-RA to collect which physical registers are
   /// preserved by given machine function.
   FunctionPass *createRegUsageInfoCollector();
 
   /// Return a MachineFunction pass that identifies call sites
   /// and propagates register usage information of callee to caller
   /// if available with PysicalRegisterUsageInfo pass.
   FunctionPass *createRegUsageInfoPropPass();
 
   /// This pass performs software pipelining on machine instructions.
   extern char &MachinePipelinerID;
 
   /// This pass frees the memory occupied by the MachineFunction.
   FunctionPass *createFreeMachineFunctionPass();
 
   /// This pass performs merging similar functions globally.
   ModulePass *createGlobalMergeFuncPass();
 
   /// This pass performs outlining on machine instructions directly before
   /// printing assembly.
   ModulePass *createMachineOutlinerPass(bool RunOnAllFunctions = true);
 
   /// This pass expands the reduction intrinsics into sequences of shuffles.
   FunctionPass *createExpandReductionsPass();
 
   // This pass replaces intrinsics operating on vector operands with calls to
   // the corresponding function in a vector library (e.g., SVML, libmvec).
   FunctionPass *createReplaceWithVeclibLegacyPass();
 
   // Expands large div/rem instructions.
   FunctionPass *createExpandLargeDivRemPass();
 
   // Expands large div/rem instructions.
   FunctionPass *createExpandLargeFpConvertPass();
 
   // This pass expands memcmp() to load/stores.
   FunctionPass *createExpandMemCmpLegacyPass();
 
   /// Creates Break False Dependencies pass. \see BreakFalseDeps.cpp
   FunctionPass *createBreakFalseDeps();
 
   // This pass expands indirectbr instructions.
   FunctionPass *createIndirectBrExpandPass();
 
   /// Creates CFI Fixup pass. \see CFIFixup.cpp
   FunctionPass *createCFIFixup();
 
   /// Creates CFI Instruction Inserter pass. \see CFIInstrInserter.cpp
   FunctionPass *createCFIInstrInserter();
 
   /// Creates CFGuard longjmp target identification pass.
   /// \see CFGuardLongjmp.cpp
   FunctionPass *createCFGuardLongjmpPass();
 
   /// Creates EHContGuard catchret target identification pass.
   /// \see EHContGuardCatchret.cpp
   FunctionPass *createEHContGuardCatchretPass();
 
   /// Create Hardware Loop pass. \see HardwareLoops.cpp
   FunctionPass *createHardwareLoopsLegacyPass();
 
   /// This pass inserts pseudo probe annotation for callsite profiling.
   FunctionPass *createPseudoProbeInserter();
 
   /// Create IR Type Promotion pass. \see TypePromotion.cpp
   FunctionPass *createTypePromotionLegacyPass();
 
   /// Add Flow Sensitive Discriminators. PassNum specifies the
   /// sequence number of this pass (starting from 1).
   FunctionPass *
   createMIRAddFSDiscriminatorsPass(sampleprof::FSDiscriminatorPass P);
 
   /// Read Flow Sensitive Profile.
   FunctionPass *
   createMIRProfileLoaderPass(std::string File, std::string RemappingFile,
                              sampleprof::FSDiscriminatorPass P,
                              IntrusiveRefCntPtr<vfs::FileSystem> FS);
 
   /// Creates MIR Debugify pass. \see MachineDebugify.cpp
   ModulePass *createDebugifyMachineModulePass();
 
   /// Creates MIR Strip Debug pass. \see MachineStripDebug.cpp
   /// If OnlyDebugified is true then it will only strip debug info if it was
   /// added by a Debugify pass. The module will be left unchanged if the debug
   /// info was generated by another source such as clang.
   ModulePass *createStripDebugMachineModulePass(bool OnlyDebugified);
 
   /// Creates MIR Check Debug pass. \see MachineCheckDebugify.cpp
   ModulePass *createCheckDebugMachineModulePass();
 
   /// The pass fixups statepoint machine instruction to replace usage of
   /// caller saved registers with stack slots.
   extern char &FixupStatepointCallerSavedID;
 
   /// The pass transforms load/store <256 x i32> to AMX load/store intrinsics
   /// or split the data to two <128 x i32>.
   FunctionPass *createX86LowerAMXTypePass();
 
   /// The pass transforms amx intrinsics to scalar operation if the function has
   /// optnone attribute or it is O0.
   FunctionPass *createX86LowerAMXIntrinsicsPass();
 
   /// When learning an eviction policy, extract score(reward) information,
   /// otherwise this does nothing
   FunctionPass *createRegAllocScoringPass();
 
   /// JMC instrument pass.
   ModulePass *createJMCInstrumenterPass();
 
   /// This pass converts conditional moves to conditional jumps when profitable.
   FunctionPass *createSelectOptimizePass();
 
   FunctionPass *createCallBrPass();
 
   /// Lowers KCFI operand bundles for indirect calls.
   FunctionPass *createKCFIPass();
 } // End llvm namespace
 
 #endif

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