Fix bad performance on complex patmat #9522
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lrytz
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Mar 2, 2021
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Switch the one method-local only ListSet to a mutable.LinkedHashSet and I made the cartesian product return early by making it a tailrec loop. The rest other ListSets cross file or module boundaries so I'd rather keep them immutable. cc @retronym |
AnalysisBudget.maxDPLLdepth is already working to limit the initial SAT solving. But given enough unassigned symbols, like the test case, the compiler can end up spending the rest of eternity and all its memory expanding the model. So apply the limit where it hurts most (the cartesian product part). The ordered sets and various sortings, instead, are to stabilise the results.
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at #8830 (comment) @lrytz wrote:
I've noticed it failing in various places as well (on random PRs, on our Windows Jenkins) |
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AnalysisBudget.maxDPLLdepth is already working to limit the initial SAT
solving. But given enough unassigned symbols, like the test case, the
compiler can end up spending the rest of eternity and all its memory
expanding the model. So apply the limit where it hurts most (the
cartesian product part).
The ordered sets and various sortings, instead, are to stabilise the
results.
Fixes scala/bug#12237