v.g.vassilev added inline comments.

================
Comment at: clang/lib/Serialization/ASTWriterDecl.cpp:288
+      }
+      for (auto &SpecInfo : LazySpecializations) {
+        Record.push_back(SpecInfo.DeclID);
----------------
SAtacker wrote:
> ChuanqiXu wrote:
> > v.g.vassilev wrote:
> > > We should not store the lazy specialization information as an array of 
> > > items because that makes the search slow. Instead we should use the 
> > > `OnDiskHashTable` approach which we use already to store the identifier 
> > > data.
> > Do you want to implement it in this patch? Or this is a note for future 
> > optimizations?
> I tried it here https://reviews.llvm.org/D144831 but to my surprise it gives 
> worse performance for my testing environment which generates random 
> specializations per module and a single main file.
> Do you want to implement it in this patch? Or this is a note for future 
> optimizations?

That was the intent since it was blocking the google folks. If that's not the 
case then maybe we can do it as a separate improvement...


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D41416/new/

https://reviews.llvm.org/D41416

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