Comments (5)
given that the regression was a bugfix, it seems unlikely to be fixable
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I wouldn't say that. Bugfixes introduce perf regressions all the time but they can often be tweaked to keep the bug fixed while fixing the perf regression.
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cc @N5N3
from julia.
It seems impossible that the doubled allocation all comes from UnionAll unaliasing.
So there might be some unexpected side effect.
I will take a look when I have time, but not sure if there's a (quick) fix.
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Tried to test this a bit locally, It turns out that 02f27c2 caused this "regression".
I have verified that type intersection does generate some result with free TypeVar
on v1.10.2 during Makie
's pre-compilation.
IIUC, this would change the result of inference and "simplified" the compiled signature, thus make loading faster.
From this perspective, this is not a regression of type intersection itself.
BTW, I also noticed that the inputs of jl_type_intersection_env_s
might contain free TypeVar
even during bootstrap.
And obviously, these free TypeVar
s do not come from type intersection. @vtjnash Is this expected?
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