typemap: attempt split on typenames also #35384
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JeffBezanson
reviewed
Jul 2, 2020
src/typemap.c
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| jl_datatype_t *dt = (jl_datatype_t*)t1; | ||
| if ((abstract || !dt->abstract) && !jl_is_kind(t1)) | ||
| return 0; | ||
| return 1; |
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In this case we return NULL above, so in what sense is that imprecise? Or maybe a better question is, when does this function differ from jl_type_extract_name() == NULL?
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I suppose NULL is imprecise in the sense that we'll never consider asking this jl_type_extract_name_imprecise question if the result was NULL?
JeffBezanson
reviewed
Jul 2, 2020
vtjnash
commented
Jul 2, 2020
src/typemap.c
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| jl_datatype_t *dt = (jl_datatype_t*)t1; | ||
| if ((abstract || !dt->abstract) && !jl_is_kind(t1)) | ||
| return 0; | ||
| return 1; |
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I suppose NULL is imprecise in the sense that we'll never consider asking this jl_type_extract_name_imprecise question if the result was NULL?
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@nanosoldier |
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Your benchmark job has completed - possible performance regressions were detected. A full report can be found here. cc @ararslan |
JeffBezanson
approved these changes
Jul 10, 2020
If the parameter is a TypeVar, it cnan have subtypes that might appear in the map itself and require a scan to locate.
This is an odd inversion in the specificity lattice where supertype(T) is more specific than T (and type-equal to T). Handle that here by consistently normalizing to the more specific copy, to avoid complications later.
… argument Previously, the TypeMap could only split on leaf types. Now it also has the ability to split on more abstract types. This helps gives types their own linear list to scan to find its constructors, instead of needing to search through all constructors.
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This is a recreation of #16418, now working due to many changes in the meantime! In measurements, it appears to successfully shave significant time off
requirecalls: