(In reply to André Bargull [:anba] from comment #1) > Hi Jan, I've got a quick question. This bug is caused by `SetPropIRGenerator` attaching the `MegamorphicStoreSlot` [here](https://searchfox.org/mozilla-central/rev/7abb9117c8500ed20833746c9f8e800fce3a4688/js/src/jit/CacheIR.cpp#3586-3592). Sorry for the delay. Would it work to check `IsPropertyInitOp(*pc)` there?
Bug 1536228 Comment 3 Edit History
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(In reply to André Bargull [:anba] from comment #1) > Hi Jan, I've got a quick question. This bug is caused by `SetPropIRGenerator` attaching the `MegamorphicStoreSlot` [here](https://searchfox.org/mozilla-central/rev/7abb9117c8500ed20833746c9f8e800fce3a4688/js/src/jit/CacheIR.cpp#3586-3592). Sorry for the delay. Would it work to check `IsPropertySetOp(*pc)` there?