[PATCH] D147697: [IR] Add TargetExtTypeClass

[Nicolai Hähnle via Phabricator via llvm-commits]

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This allows for extensibility in how the target type info is obtained,
serving two purposes:

1. Small step towards "Dialects in LLVM", in providing extensibility for users of LLVM. Users of LLVM can now define their own "target" extension types (now a somewhat misleading name) with custom layout and properties, to represent high-level concepts that are lowered away before code reaches the actual backend.

2. By storing a pointer to the type class in the type itself, we can avoid string comparisons when looking up type info.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147697

Files:
  llvm/include/llvm/IR/DerivedTypes.h
  llvm/include/llvm/IR/LLVMContext.h
  llvm/lib/IR/LLVMContext.cpp
  llvm/lib/IR/LLVMContextImpl.h
  llvm/lib/IR/Type.cpp

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