[PATCH] D16618: AttributeSetImpl: Summarize existing function attributes in a bitset.

[Matthias Braun via llvm-commits]

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The majority of attribute queries checks for the existence of an enum
attribute in the FunctionIndex slot. We only have 48 of those and can
therefore summarize them in an uint64_t bitset which measurably improves
compile time.

Repository:
  rL LLVM

http://reviews.llvm.org/D16618

Files:
  include/llvm/IR/Attributes.h
  include/llvm/IR/Function.h
  lib/IR/AttributeImpl.h
  lib/IR/Attributes.cpp

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