Make SabreSwap account for clbits in predecessors (backport #7952) #7957
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* Make SabreSwap account for clbits in predecessors Previously, SabreSwap only checked that it was valid to add a gate back to the DAG by ensuring that all its qubit predecessors had already been added to the DAG. It did not check for clbit successors. This meant that measurements and (potentially, unverified) classically conditioned gates could be re-ordered out from the correct topological ordering. The most notable effect of this was that measurements writing to the same bit could be re-ordered, changing the output of the circuit. See gh-7950 for more detail. * Add reno * Fix lint * Trim fat in SabreSwap._successors Co-authored-by: Matthew Treinish <mtreinish@kortar.org> * Fix _successors method Co-authored-by: Matthew Treinish <mtreinish@kortar.org> (cherry picked from commit 38f3705)
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mtreinish
approved these changes
Apr 19, 2022
mtreinish
added
automerge
Changelog: Bugfix
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