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[DA] DivergenceAnalysis for unstructured, reducible CFGs

Authored by nhaehnle on Oct 18 2018, 2:38 AM.

Description

[DA] DivergenceAnalysis for unstructured, reducible CFGs

Summary:
This is patch 2 of the new DivergenceAnalysis (https://reviews.llvm.org/D50433).

This patch contains a generic divergence analysis implementation for
unstructured, reducible Control-Flow Graphs. It contains two new classes.
The SyncDependenceAnalysis class lazily computes sync dependences, which
relate divergent branches to points of joining divergent control. The
DivergenceAnalysis class contains the generic divergence analysis
implementation.

Reviewers: nhaehnle

Reviewed By: nhaehnle

Subscribers: sameerds, kristina, nhaehnle, xbolva00, tschuett, mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D51491

llvm-svn: 344734