[NFC] Allow SubTypes::iterSubTypes to stop early#8573
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kripken wants to merge 5 commits intoWebAssembly:mainfrom
Open
[NFC] Allow SubTypes::iterSubTypes to stop early#8573kripken wants to merge 5 commits intoWebAssembly:mainfrom
kripken wants to merge 5 commits intoWebAssembly:mainfrom
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In ConstantFieldPropagation this is important: we scan subtypes
to check if they all have 2 possible values we can
ref.testbetween.In the common case there are many values and we can stop early.
This makes the pass 4.2x faster on a large Dart testcase, and
-O3overall 3.5% faster.Fun fact, the test that is added to here was slightly wrong before:
lacking a rec group, types B and C were actually identical, so we
didn't fully test what we thought we did.