✨ Preserve and control compiler qubit layouts by simon1hofmann · Pull Request #2553 · munich-quantum-toolkit/core

simon1hofmann · 2026-09-12T13:36:51Z

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Description

Preserve imported transpiler layouts across copies, MLIR serialization, and plain QC/QCO conversions. Add native initial-placement controls and a MappingResult containing initial/final target site IDs in input allocation order.

The shared mqt.layout schema stores wire provenance; the Qiskit 2.5 adapter reconstructs SDK objects on export. Import leaves gate semantics unchanged. Native compilation uses no Qiskit algorithms or Python objects.

Fixes #2070.

Preserve imported layouts

from qiskit import QuantumCircuit, transpile
from mqt.core.mlir import QCProgram, QIRProfile

circuit = QuantumCircuit(2)
circuit.h(0)
circuit.cx(0, 1)
circuit = transpile(
    circuit, coupling_map=[[0, 1], [1, 0]],
    initial_layout=[1, 0], optimization_level=0,
)
program = QCProgram.from_qiskit(circuit)
restored = program.copy().to_qco().to_qc().to_qiskit()
assert restored.layout.final_index_layout() == circuit.layout.final_index_layout()

# Accept losing provenance before conversion to a format without layouts.
program.discard_layout()
bitcode = program.to_qir(QIRProfile.BASE).to_bitcode()

C++ callers use Program::discardLayout(). The CLI equivalent is:

mqt-cc input.mlir --discard-layout --emit=qir-base -o output.ll

Control native placement

from mqt.core.mlir import (
    CompilationOptions, CompilerTarget, MappingOptions, PayloadEncoding, PayloadFormat,
    PayloadSpecification, QCProgram, TargetEnvironment,
)

target = CompilerTarget(
    3,
    connectivity=CompilerTarget.Connectivity([(0, 1), (1, 2)]),
    native_operations=CompilerTarget.NativeOperations.unrestricted(),
)
environment = TargetEnvironment(
    target,
    PayloadSpecification(
        PayloadFormat("qir", "2.1.0", "base", PayloadEncoding.BINARY),
        [], optional_capabilities_known=True,
    ),
)
program = QCProgram.from_openqasm_str('''OPENQASM 3.1;
include "stdgates.inc";
qubit[2] q;
h q[0]; cx q[0], q[1];
''').to_qco()
layout = program.compile_for_target_with_layout(
    environment, initial_layout=[0, 2], options=CompilationOptions(seed=42, mapping=MappingOptions(trials=4, iterations=2, lookahead=10)),
)
print(layout.allocation_sizes)
print(layout.initial_layout)
print(layout.final_layout)

This reports allocation sizes [2] and initial sites [0, 2]; routing may change final sites. Omit initial_layout or pass [] for automatic placement. Explicit placement skips trials and refinement; lookahead still controls routing. Shared compiler controls use CompilationOptions from #2551. Low-level pipeline callers use runWithCompilationOptions for seed, instrumentation, and layout invalidation.

Result order follows entry-block allocations and ascending tensor slots, including idle inputs. Tracking preserves ordinary placement and routing without adding circuit operations; classical measurement destinations remain unchanged.

Limitations

Interchange supports Qiskit 2.5 TranspileLayout, including partial assignments, gaps, ancillary inputs, register groups, and output permutations. Bare Layout is unsupported. Input indices must be contiguous and physical references must exist. Partial final maps require explicit, complete output ordering; SDK helpers requiring total layouts may reject them.
Transformations and public custom pipelines invalidate imported provenance without composing it with native results. Call discard_layout() before subsequent SDK export. OpenQASM, QIR/LLVM, and jeff also require discard before exporting retained layouts. Discard leaves operations unchanged.
runWithCompilationOptions invalidates layouts once per pipeline by default. Set preservesLayout=true only when wire identity and order are preserved. Individual transforms need no invalidation hooks; loss checks remain at format boundaries. Direct PassManager::run and raw IR edits leave layout lifetime to the caller. Discard and output checks cover the full module tree. A root invalidation marker survives removal of nested modules. Schema checks cannot detect every stale mapping.
Native placement accepts fixed-size local entry-block allocations and requires one distinct target site ID per input when placement is explicit. Dynamic, nested, and physical allocations and partial placement constraints are unsupported. Idle inputs count against capacity; previously removed qubits cannot be recovered.
MappingResult is a detached, unserialized snapshot. The low-level result must outlive its pass manager and is written only on success. Program contents are unspecified after failure. CLI placement controls and report serialization are outside scope.

Validation and performance

642 Python tests, 399 native tests, three CLI CTests, and both examples pass. Tests cover schema/lifetime rules, explicit placement, idle inputs, failure publication, and logical-state/unitary semantics. Boundary regressions cover recursive discard, private nested-module removal, failed pipelines, standalone canonicalization, and CLI preservation during plain QC-to-QCO conversion. Automatic tracking matches ordinary compiled IR; regression workloads produce 15 and 120 SWAPs, respectively, on the 8- and 16-qubit chains.

Nine local workloads measured at a4077e2ed showed at most +0.42% median overhead, with all ordinary/tracked interquartile ranges overlapping. Setup: macOS ARM64, CPython 3.13, MinSizeRel; two warmups and 15 alternating pairs; automatic placement, seed 7, trials 1, iterations 1, lookahead 20; parse/copy/export excluded. These local measurements do not establish a universal overhead bound. Source indices share target preparation and survive tensor shrinking; removed inputs follow workspace permutations.

Repository lint and full changed-file C++ lint pass. Codex assisted with implementation, tests, documentation, and this description.

Checklist

The pull request only contains commits that are focused and relevant to this change.
I have added appropriate tests that cover the new/changed functionality.
I have updated the documentation to reflect these changes.
The changes follow the project's style guidelines and introduce no new warnings.
The changes are fully tested and pass the CI checks.
I have reviewed my own code changes.

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codecov · 2026-09-12T13:50:20Z

Codecov Report

❌ Patch coverage is 94.63415% with 22 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...lir/lib/Dialect/QCO/Transforms/Mapping/Mapping.cpp	88.3%	21 Missing ⚠️
mlir/lib/Compiler/Pipeline.cpp	93.7%	1 Missing ⚠️

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🤖 *AI text below* 🤖 Preserve source allocation order during native target compilation, accept a complete initial placement, and return a detached mapping snapshot. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Exercise tensor slots, workspace sites, complete routed amplitudes, automatic placement, and invalid inputs in the native suite so C++ patch coverage includes these contracts. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Exercise layout tracking with user barriers and reject quantum entry arguments in native tests. Apply the required C++ lint fixes to the coverage regressions. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Record the expanded native layout regressions and measured coverage of changed production lines. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Reuse Layout identity and swaps to satisfy requested placement and assign workspace deterministically. Remove the unreachable zero-size allocation branch and inline the single dynamic-allocation test case while preserving its diagnostic assertion. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Extend the native layout controls with frontend-neutral layout metadata. Preserve supported SDK layouts across copies and dialect conversions, invalidate provenance at transformation boundaries, and require explicit discard before exports that cannot retain it. Cover partial assignments, ancillas, routing, stale metadata, and native serialization boundaries. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Reserve SDK reconstruction storage, keep pass override visibility, and apply the required native initializer and pointer declaration style. Record the completed regression and coverage checks. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Compare imported instruction semantics with and without layout metadata, clarify partial-layout helper limitations, and record the final checks. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Give layout invalidation a stable pipeline argument and register its constructor. Saved cleanup pipelines can then be parsed and replayed instead of containing an unknown anonymous pass name. The existing failing replay regression and all five mqt-cc tests pass. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Move layout CLI coverage into the existing native test suite and remove its CMake script. Preserve export loss guards, explicit discard, import retention, and invalidation by optimization and custom pipelines. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Follow the initializer-list style enforced by the full-file C++ lint check for the new layout CLI tests. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Keep layout compilation on the shared CompilationOptions API and exercise mapping iterations and zero lookahead through layout compilation. Document which controls apply to an explicit initial layout. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Regenerate layout stubs against the shared mapping controls, apply repository formatting, and update the validation record for the rebased stack. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Keep layout compilation aligned with the pipeline builders and shared pass-manager helper on main. Cover explicit placement with zero and small routing search budgets, and record validation after the rebase. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Invalidate retained layouts throughout the transformed module subtree and release the GIL during native layout compilation. Cover both regressions and refresh the plan wording and validation counts. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Record source identities on allocations and preserve them through tensor shrinking instead of injecting barriers and extracting every input slot. Keep ordinary wire discovery and indexed placement, represent removed inputs in the layout permutation, and create no idle physical wires for placement. Fold tracking preparation into the existing target-preparation pass to avoid its separate IR verification and move the completed result to the caller. Compare ordinary and tracked compilation directly and retain semantic checks for explicit placement, idle inputs, workspace routing, and result publication. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Remove repeated layout explanations and implementation narration while retaining usage examples, ownership, and failure contracts. Keep schema and lifetime details in the dialect reference. Assisted-by: GPT-6 via Codex

🤖 *AI text below* 🤖 Make the shared pipeline runner own imported layout lifetime so individual transforms do not need layout hooks or an extra invalidation pass. Native pass-manager callers use runWithCompilationOptions for that policy. Keep loss checks at direct format boundaries and remove duplicate checks from program wrappers. Cover nested modules, failed pipelines, and plain QC-to-QCO preservation in the CLI. Assisted-by: GPT-6 via Codex

simon1hofmann · 2026-09-16T14:23:16Z

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coderabbitai · 2026-09-16T14:23:22Z

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📒 Files selected for processing (6)

.agent/plans/compiler-layout-controls.md
mlir/include/mqt/Dialect/MQT/IR/MQTDialect.td
mlir/include/mqt/Dialect/MQT/IR/QubitLayout.h
mlir/lib/Dialect/MQT/IR/QubitLayout.cpp
mlir/unittests/Compiler/test_compiler_pipeline.cpp
mlir/unittests/Dialect/MQT/IR/test_mqt_ir.cpp

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📝 Summary

Summary by CodeRabbit

New Features
- Added qubit-layout tracking during target compilation, including optional initial placement and detached mapping results.
- Qiskit imports and exports now preserve supported transpiler layout metadata, including routing, ancillas, registers, and output ordering.
- Added APIs and command-line support to explicitly discard layout metadata.
Behavior Changes
- Layout metadata is invalidated by transformations that may change resource or wire identity.
- Unsupported exports now require explicit layout discard and report a clear error.
Documentation
- Added guidance for layout provenance, routing permutations, compilation layouts, and discard behavior.

Walkthrough

This PR adds shared qubit-layout provenance across MLIR, native target compilation, Qiskit translation, compiler pipelines, CLI output, and Python bindings. It tracks initial and final placement, preserves supported metadata, invalidates stale metadata, and requires explicit discard for lossy outputs.

Changes

Qubit layout provenance

Layer / File(s)	Summary
Layout schema and lifecycle `mlir/include/mqt/Dialect/MQT/`, `mlir/lib/Dialect/MQT/`, `mlir/lib/Dialect/QTensor/*`	Adds `QubitLayout`, layout attributes, source-qubit tracking, schema validation, serialization, invalidation, and discard operations.
Native layout compilation `mlir/include/mqt/Compiler/`, `mlir/lib/Compiler/`, `mlir/lib/Dialect/QCO/Transforms/Mapping/*`	Adds `MappingResult` and layout-aware compilation with automatic or explicit placement, routing results, allocation sizes, idle inputs, and failure-safe result publication.
Pipeline and output controls `mlir/include/mqt/Support/`, `mlir/lib/Support/`, `mlir/lib/Conversion/`, `mlir/tools/mqt-cc/`, `bindings/mlir/register_mlir.cpp`	Invalidates metadata for non-preserving pipelines, rejects unsupported outputs, and adds `discardLayout`, `discard_layout`, `--discard-layout`, and native compilation bindings.
Qiskit interchange `bindings/mlir/qiskit/*`	Imports supported Qiskit `TranspileLayout` metadata into `mqt.layout` and reconstructs it during export.
Validation and documentation `test/python/`, `mlir/unittests/`, `docs/`, `.agent/plans/`	Adds coverage and documentation for schema validation, native placement, routing, invalidation, discard behavior, and Qiskit round trips.

Priority: ➖ Normal

Estimated code review effort: 5 (Critical) | ~90 minutes

Change: Feature · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant QiskitCircuit
  participant QiskitAdapter
  participant MLIRModule
  participant CompilerPipeline
  QiskitCircuit->>QiskitAdapter: import TranspileLayout
  QiskitAdapter->>MLIRModule: attach mqt.layout
  MLIRModule->>CompilerPipeline: run compilation
  CompilerPipeline->>MLIRModule: preserve or invalidate layout
  MLIRModule->>QiskitAdapter: provide valid layout
  QiskitAdapter->>QiskitCircuit: reconstruct TranspileLayout

Suggested reviewers: burgholzer, denialhaag

Merge Risk: ⚪ Minimal · up to 0ba1b

No concrete unresolved merge-blocking issue is established for the current change.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.82% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 136 functions across 29 files. (2 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR meets the coding requirements in `#2070`. It adds the frontend-neutral `mqt.layout` schema with initial, routing, output, register, ancilla, partial-assignment, and physical-gap data. The Qiskit …
Out of Scope Changes check	✅ Passed	The changes remain within `#2070`. Native placement controls and `MappingResult` provide layout tracking needed to verify initial and final mappings. Documentation, CLI controls, schema validation, recu…
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving and controlling compiler qubit layouts.
Description check	✅ Passed	The description is complete and relevant. It covers the motivation, implemented functionality, limitations, testing, documentation, issue reference, AI disclosure, and all checklist items. It also ide…

Full details: Docstring Coverage

Explanation

Docstring coverage is 33.82% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 136 functions across 29 files. (2 skipped: 2 unsupported.)

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❤️ Share

_{I carry mappings through the wires,
Past routed paths and compiler fires.
Qiskit’s layout comes along,
Native sites keep qubits strong.
Stale marks fade when changes flow,
And rabbits export what they know.}

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Actionable comments posted: 2

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Inline comments:
In `@mlir/lib/Dialect/MQT/IR/MQTDialect.cpp`:
- Line 774: Update prepareLayout’s validation so operation-type support is
checked independently from tensor width, allowing a zero-slot tensor with an
empty indices array while still rejecting unsupported operation types and
mismatched non-empty index counts. Use the existing operation-type validation
symbol near the width check rather than treating width == 0 as invalid.

In `@mlir/lib/Dialect/MQT/IR/QubitLayout.cpp`:
- Around line 190-197: Update discardQubitLayout and requireNoQubitLayout to
traverse every nested ModuleOp, matching invalidateQubitLayout’s module-tree
processing. Remove layout attributes from all nested modules during discard, and
reject the boundary if any nested module has mqt.layout or
mqt.layout_invalidated.

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📒 Files selected for processing (37)

.agent/plans/compiler-layout-controls.md
bindings/mlir/qiskit/Qiskit2_5.cpp
bindings/mlir/qiskit/QiskitExport.cpp
bindings/mlir/qiskit/QiskitImport.cpp
bindings/mlir/qiskit/QiskitTranslation.h
bindings/mlir/register_mlir.cpp
docs/glossary.md
docs/mlir/qiskit.md
docs/mlir/target_compilation.md
mlir/include/mqt/Compiler/Programs.h
mlir/include/mqt/Compiler/TargetCompilation.h
mlir/include/mqt/Dialect/MQT/IR/MQTDialect.td
mlir/include/mqt/Dialect/MQT/IR/QubitLayout.h
mlir/include/mqt/Dialect/QCO/Transforms/Mapping/Mapping.h
mlir/include/mqt/Support/Passes.h
mlir/lib/Compiler/Pipeline.cpp
mlir/lib/Compiler/Programs.cpp
mlir/lib/Compiler/TargetCompilation.cpp
mlir/lib/Conversion/QCOToJeff/QCOToJeff.cpp
mlir/lib/Conversion/QCToQIR/QIRAdaptive/QCToQIRAdaptive.cpp
mlir/lib/Conversion/QCToQIR/QIRBase/QCToQIRBase.cpp
mlir/lib/Dialect/MQT/IR/CMakeLists.txt
mlir/lib/Dialect/MQT/IR/MQTDialect.cpp
mlir/lib/Dialect/MQT/IR/QubitLayout.cpp
mlir/lib/Dialect/QC/Translation/TranslateQCToOpenQASM3.cpp
mlir/lib/Dialect/QCO/Transforms/Mapping/Mapping.cpp
mlir/lib/Dialect/QTensor/Transforms/ShrinkRegisters.cpp
mlir/lib/Support/Passes.cpp
mlir/tools/mqt-cc/mqt-cc.cpp
mlir/unittests/Compiler/mqt-cc/CMakeLists.txt
mlir/unittests/Compiler/mqt-cc/layout.qc.mlir
mlir/unittests/Compiler/mqt-cc/test_cli_options.cpp
mlir/unittests/Compiler/test_compiler_pipeline.cpp
mlir/unittests/Dialect/MQT/IR/test_mqt_ir.cpp
python/mqt/core/mlir.pyi
test/python/test_mlir.py
test/python/test_mlir_qiskit_translation.py

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🤖 *AI text below* 🤖 Check and discard provenance throughout the module tree. Retain an invalidation marker at the pipeline root so deleting a private child cannot silently remove the explicit-discard requirement. Cover retained and invalidated nested metadata, recursive discard, and export before and after cleanup removes the nested module. Assisted-by: GPT-6 via Codex

simon1hofmann · 2026-09-16T15:49:03Z

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simon1hofmann added feature New feature or request MLIR Anything related to MLIR c++ Anything related to C++ code python Anything related to Python code labels Sep 12, 2026

simon1hofmann added this pull request to stack #2555 September 13, 2026 11:25

simon1hofmann added this to the v4.1.0 - QDMI 1.4 / MQSF milestone Sep 13, 2026

simon1hofmann self-assigned this Sep 13, 2026

simon1hofmann changed the title ~~✨ Expose native initial and final qubit layouts~~ ✨ Preserve and control compiler qubit layouts Sep 13, 2026

simon1hofmann mentioned this pull request Sep 13, 2026

✨ Expose native target mapping controls #2551

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mergify Bot added the conflict label Sep 14, 2026

simon1hofmann force-pushed the feat/compiler-layout-controls branch from e1add22 to def00d3 Compare September 14, 2026 09:36

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Base automatically changed from feat/target-mapping-controls to main September 15, 2026 12:09

simon1hofmann added 13 commits September 15, 2026 14:13

✨ Expose native initial and final qubit layouts

5d11ad4

🤖 *AI text below* 🤖 Preserve source allocation order during native target compilation, accept a complete initial placement, and return a detached mapping snapshot. Assisted-by: GPT-6 via Codex

🎨 Apply native layout code checks

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📝 Record native layout behavior and validation

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✅ Cover native layout tracking and routing results

ee3330f

🤖 *AI text below* 🤖 Exercise tensor slots, workspace sites, complete routed amplitudes, automatic placement, and invalid inputs in the native suite so C++ patch coverage includes these contracts. Assisted-by: GPT-6 via Codex

✅ Cover barriers and unsupported quantum inputs

5048dc0

🤖 *AI text below* 🤖 Exercise layout tracking with user barriers and reject quantum entry arguments in native tests. Apply the required C++ lint fixes to the coverage regressions. Assisted-by: GPT-6 via Codex

📝 Record native layout coverage validation

9e4036b

🤖 *AI text below* 🤖 Record the expanded native layout regressions and measured coverage of changed production lines. Assisted-by: GPT-6 via Codex

📝 Finalize layout interchange validation

b359c83

🤖 *AI text below* 🤖 Compare imported instruction semantics with and without layout metadata, clarify partial-layout helper limitations, and record the final checks. Assisted-by: GPT-6 via Codex

🎨 Add trailing commas to CLI test inputs

a212472

🤖 *AI text below* 🤖 Follow the initializer-list style enforced by the full-file C++ lint check for the new layout CLI tests. Assisted-by: GPT-6 via Codex

simon1hofmann added 3 commits September 15, 2026 14:15

📝 Finalize the rebased layout interface and validation

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🤖 *AI text below* 🤖 Regenerate layout stubs against the shared mapping controls, apply repository formatting, and update the validation record for the rebased stack. Assisted-by: GPT-6 via Codex

simon1hofmann force-pushed the feat/compiler-layout-controls branch from def00d3 to b28e699 Compare September 15, 2026 12:30

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simon1hofmann added 4 commits September 16, 2026 13:31

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Comment thread mlir/lib/Dialect/MQT/IR/MQTDialect.cpp

Comment thread mlir/lib/Dialect/MQT/IR/QubitLayout.cpp Outdated

simon1hofmann requested a review from burgholzer September 16, 2026 15:23

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✨ Preserve and control compiler qubit layouts - #2553

✨ Preserve and control compiler qubit layouts#2553
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Description

Preserve imported layouts

Control native placement

Limitations

Validation and performance

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