Account for exactness when finding the most refined fallthrough #7544
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Split the automatically generated optimize-instructions-all-casts.wast into two tests: one that tests casts to exact types and another that tests casts to inexact types. For the test file that does not cast to exact types, additionally test with custom descriptors disabled to ensure that the results validate.
Treat exactness as part of the heap type and prefer to refine it over refining nullability. This is a somewhat arbitrary choice, and as shown by the tests, it is possible to construct a situation in which preferring to refine nullability would be preferable.
kripken
approved these changes
Apr 23, 2025
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| (module | ||
| ;; CHECK: (type $super (sub (struct))) | ||
| (type $super (sub (struct))) |
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As there is no sub, perhaps this could be called struct?
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I'll use $foo since it doesn't matter that it's a struct in particular, either.
| ;; hoist it to eliminate the cast. | ||
| (ref.cast (ref $super) | ||
| (local.tee 1 | ||
| (local.get 0) |
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Might be clearer to use var names here. And if the param name were $exact (to contrast with the local $inexact or just $struct) then readability would be even better imo
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Treat exactness as part of the heap type and prefer to refine it over
refining nullability. This is a somewhat arbitrary choice, and as shown
by the tests, it is possible to construct a situation in which
preferring to refine nullability would be preferable.