mirror of https://github.com/Qiskit/qiskit.git
16 lines
902 B
YAML
16 lines
902 B
YAML
---
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fixes:
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- |
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When :class:`.SabreLayout` is used to do both layout and routing simultaneously (as is the case
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for the default options to :func:`.transpile` and :func:`.generate_preset_pass_manager`) on a
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:class:`.Target` or :class:`.CouplingMap` with disjoint connectivity, and the input circuit fits
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into a single component of the coupling map, the routing permutation will now be tracked
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correctly.
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Previously, any qubits in the coupling map that were not connected, even indirectly, to a qubit
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used by the routed circuit would not be included in the final routing permutation. This could
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cause surprising behaviour a long way from the point of failure, even if compilation appeared to
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succeed, such as calls to :meth:`.TranspileLayout.final_index_layout` raising :exc:`KeyError`.
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This bug did not affect backends that were fully connected, as most are.
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