Avoid most deep subtypes in test #3272
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test performance please |
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performance test scheduled: 9 job(s) in queue, 1 running. |
The only remaining testcase requiring deep subtype is t8146a.scala for good reasons.
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Performance test finished successfully: Visit http://dotty-bench.epfl.ch/3272/ to see the changes. Benchmarks is based on merging with master (af528a1) |
odersky
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Oct 6, 2017
| // below never contain TypeRefs whose underling types contain | ||
| // uninstantiated TypeVars, this could lead to cycles in `isSubType` | ||
| // as a TypeVar might get constrained by a TypeRef it's part of. | ||
| val tp1a = fullyDefinedType(tp1, "alternative", alt1.symbol.pos).asInstanceOf[PolyType] |
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I wonder whether we could optimize this so that we do the fullyDefinedType only if the type parameter bounds are non-trivial. fullyDefinedType is somewhat expensive.
odersky
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Oct 6, 2017
| val tparams = ctx.newTypeParams(alt1.symbol, tp1.paramNames, EmptyFlags, tp1.instantiateBounds) | ||
| isAsSpecific(alt1, tp1.instantiate(tparams.map(_.typeRef)), alt2, tp2) | ||
| val nestedCtx = ctx.fresh.setExploreTyperState() | ||
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I believe we can use TyperState.test here/ It's cheaper and easier to use.
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The only remaining testcase requiring deep subtype is t8146a.scala for
good reasons.