Reconciling High-level Optimizations and Low-level Code in LLVM

This is the implementation of OOPSLA'18 LLVM memory model.

You can clone corresponding Clang branches from https://github.com/snu-sf/clang-twin.

Branch name	Clang branch name	Description
base	base	Baseline (LLVM 6.0, official release)
nointptrfold	base	(base +) No inttoptr(ptrtoint p)-> p fold
correct	base	All known unsound optimizations disabled
psub	psub	(correct +) Add 'psub' intrinsics
optimized	psub	(psub +) Sound optimizations added (GVN, ..)
i8canon	psub	(optimized +) Add i64->i8* canonicalization
		pass to support SLP vectorization

Low Level Virtual Machine (LLVM)

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