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getdereferenceableornullbytes
2017 Mar 20
4
[RFC] Attribute overhaul 2
LLVM's Attribute APIs need an overhaul.
Current problems
================
First, testing for an attribute on an Argument is slow.
llvm::AttributeSet::getAttributes(int) consumed 2% of cycles while
optimizing
llc during LTO. Our mid-level optimizations are constantly asking if a given
argument has some attribute (nonnull, dereferencable, etc), and this is
currently linear in the size of the