[PATCH] D35267: Pass Divergence Analysis data to selection DAG to drive divergence dependent instruction selection

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

> Please also note that this addition does not depend on "tid" or any other divergent data. It is not possible to discover this dependency analyzing individual block. We need CFG information.

Yes, this is what I was getting at with "We should query the IR DivergenceAnalysis to compute isSDNodeSourceOfDivergence for a CopyFromReg from a live-in virtual register."; the nodes which need CFG information are precisely CopyFromReg nodes from virtual registers.  Each virtual register created by the SelectionDAGBuilder should correspond to exactly one IR instruction.


https://reviews.llvm.org/D35267