Add PRAGMA to allow user control of swap search strategy #914
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This PR adds a specialized PRAGMA for controlling the value of the
*addresser-rewiring-search-search-type*special variable. This value defaults to :a* but two other options are available that have been previous unexposed to end-users.The PRAGMA introduced here has the following syntax:
Where
<SEARCHTYPE>should be a string that names one of the available algorithms:"A*","GREEDY_QUBIT", or"GREEDY_PATH".This PR is offered as a partial answer to #913 after discovering through experimentation that the offending program + chip spec discussed there compiled more quickly and with lower resource requirements after manually rebinding the
*addresser-rewiring-swap-search-type*in the REPL.It should be noted that I did not reproduce the exact crash that @MarquessV encountered, probably due to increased heap size given to SBCL on my machine. Compilation with the default search type of
':A*did, however, take a very long time to finish.