Fix basis_gates and coupling_map backend override in transpile() (backport #9789) #9792
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This commit fixes an issue in the transpile() function when a user specified the `backend` argument with a BackendV2 based backend along with `basis_gates` or `coupling_map`. In this case the `transpile()` was generating the preset pass manager with a target, coupling map, and basis gates list. However, most individual passes that take basis gates and a Target will prefer to use the target if both are specified. This is generally sane behavior at the pass level because the target contains more rich data and tighter constraints that a transpiler pass will need to worry about. To fix this limitation this commit updates transpile() to not use the backend's target if either basis_gates or coupling_map are specified. Longer term this should no longer be an issue when #9256 is implemented and we'll be relying solely on a target internally. But this fix is needed until #9256 is started. Fixes #9781 Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> (cherry picked from commit bf3bb96)
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mtreinish
approved these changes
Mar 14, 2023
mtreinish
added
Changelog: Bugfix
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This is an automatic backport of pull request #9789 done by Mergify.
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