Improve proof speed of invntt_layer() #411
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For this proof we tell CBMC to remove constraints that are not in the cone of influcence of the proof obligations using the
--slice-formula
option.Experiment shows this reduces proof time for this subprogram from about 40s to about 12s on a developer's laptop.
Total proof time (using 8 CPU cores on M1 MacBook Pro)
before: 3m 46s
after: 3m 7s
All tests OK
All proofs OK
lint OK