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[GVN] Initial check-in of a new global value numbering algorithm.

Authored by davide on Dec 22 2016, 8:03 AM.

Description

[GVN] Initial check-in of a new global value numbering algorithm.

The code have been developed by Daniel Berlin over the years, and
the new implementation goal is that of addressing shortcomings of
the current GVN infrastructure, i.e. long compile time for large
testcases, lack of phi predication, no load/store value numbering
etc...

The current code just implements the "core" GVN algorithm, although
other pieces (load coercion, phi handling, predicate system) are
already implemented in a branch out of tree. Once the core is stable,
we'll start adding pieces on top of the base framework.
The test currently living in test/Transform/NewGVN are a copy
of the ones in GVN, with proper XFAIL (missing features in NewGVN).
A flag will be added in a future commit to enable NewGVN, so that
interested parties can exercise this code easily.

Differential Revision: https://reviews.llvm.org/D26224

llvm-svn: 290346

Details

Committed
davideDec 22 2016, 8:03 AM
Differential Revision
D26224: NewGVN
Parents
rG8b4340a5dd41: [WebAssembly] Add an "explicit" keyword to a constructor.
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