rmaz added inline comments.

================
Comment at: clang/lib/Serialization/ASTReader.cpp:8194
+    if (seen.insert(M).second) {
+      S.addMethodToGlobalList(&List, M);
+    }
----------------
manmanren wrote:
> Does it make sense to check for duplication inside addMethodToGlobalList, as 
> the function goes through the list as well? Maybe it is slower, as we will 
> need to go through the list for each method, instead of a lookup.
Yes, you are right, it is slower as we need to do a list traverse per insert 
rather than per selector lookup. I also profiled keeping some global state 
along with the `MethodPool` so that the set didn't have to be rebuilt each 
time, but the performance difference was negligible.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D109632/new/

https://reviews.llvm.org/D109632

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