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Implement the single LLVM-compatible MIR document path with structured\nembedded-IR references, YAML mappings, constants, and deterministic printing.\n\nKeep pointer LLT widths DataLayout-derived, reject layout-dependent output\nwhen embedded IR is omitted, and record the fixed-baseline compatibility\ncontract and regression coverage.
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Parse MachineFunction bodies in two passes and serialize the same MachineIR model in complete or readable form. Extend instruction attachments and memory operands required by the fixed LLVM MIR grammar, and cover deterministic parse-print round trips.
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Introduce an immutable register topology for units, subregisters, classes, banks, and preserved masks. Bind instruction descriptors to this topology through TargetDescription so builders, cloning, and verification share one target-aware contract. Add the test-only TestTarget model and positive and negative target fact coverage.
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Add stable, tombstone-preserving MachineConstantPool and MachineJumpTableInfo ownership. Define the versioned TargetConstant contract and integrate all table references with builders, verification, and deterministic deep cloning.
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Model stable frame indices, stack object kinds, tombstones, lifetimes, and frozen layouts. Validate owned frame references in the builder and verifier, and remap complete frame state during MachineFunction cloning.
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Deep-clone the live MachineIR graph with deterministic identity maps while rebuilding CFG, def-use, ties, register configuration, and memory operand ownership. Verify both source and destination and omit detached arena history.
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