[PATCH] D32500: Optimize ItaniumDemangle by using an arena allocator

[Scott Smith via Phabricator via llvm-commits]

scott.smith created this revision.

Use an arena allocator to reduce the number of allocations and frees.  Individual allocations become extremely cheap, and individual frees are free.  Change from std::string to a custom string implementation that is a reference to immutable data, so that substr and copies are free.  Remove the null terminator so that strings can be appended without copying the base.


Repository:
  rL LLVM

https://reviews.llvm.org/D32500

Files:
  lib/Demangle/ItaniumDemangle.cpp

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