[llvm] r232743 - GlobalDCE: Improve performance for large modules containing comdats.
peter at pcc.me.uk
Thu Mar 19 12:00:50 PDT 2015
On Thu, Mar 19, 2015 at 11:32:39AM -0700, Chandler Carruth wrote:
> On Thu, Mar 19, 2015 at 11:23 AM, Peter Collingbourne <peter at pcc.me.uk>
> > + std::unordered_multimap<Comdat *, GlobalValue *> ComdatMembers;
> I wonder if a DenseMap<Comdat *, TinyPtrVector<GlobalValue *>> would be
> better? (Using a sorted vector and std::binary_search naturally.) In
> particular, it seems like it might make sense to optimize for the case of a
> 1:1 correlation between comdat and global.
Maybe, but I don't think more performance tuning is worth it. On my machine
the pass now runs in about 3 seconds over an LTO'd module containing most
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