[5.8] SILCombine: fix a crash when optimizing keypath-offset-of #62832
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jckarter
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Jan 4, 2023
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Instead of skipping out on these cases, it's not that hard to handle them correctly. The lowered type of the ends of a keypath projection are always going to be the maximally-abstracted form of the formal type, so you can do
CanType rootTy = AI->getFunction()->getLoweredType(AbstractionPattern::getOpaque(),
pattern->getRootType().subst(patternSubs)->getCanonicalType());
And that should work for all root types. Even if the formal type happens to be a valid lowered SIL type, it is still a category error to use a formal type without lowering, and there could remain problems from doing so.
Need to use the lowered type instead of the original type. rdar://103834325
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AnthonyLatsis
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🍒 release cherry pick
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Need to use the lowered type instead of the original type.
rdar://103834325
Cherry-picked from #62862