[PATCH] D15085: [AttributeSet] Overload AttributeSet::addAttribute to reduce compile time

[Akira Hatanaka via llvm-commits]

ahatanak created this revision.
ahatanak added a subscriber: llvm-commits.

The new overloaded function is used when an attribute is added to a large number of slots of an AttributeSet (for example, to function parameters). This is much faster than calling AttributeSet::addAttribute once per slot, because AttributeSet::getImpl (which calls FoldingSet::FIndNodeOrInsertPos) is called only once per function instead of once per slot.

With this patch applied, clang compiles a file which used to take over 22 minutes in just 13 seconds.

http://reviews.llvm.org/D15085

Files:
  include/llvm/IR/Attributes.h
  lib/IR/Attributes.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  lib/Transforms/Scalar/CorrelatedValuePropagation.cpp

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