[PATCH] D48818: [VPlan] Introduce simplifyPlainCFG step in H-CFG builder.

[Diego Caballero via Phabricator via llvm-commits]

dcaballe created this revision.
dcaballe added reviewers: fhahn, rengolin, mkuper, hfinkel, mssimpso.
Herald added subscribers: llvm-commits, rogfer01, rkruppe, tschuett, bollu.

Context: Patch Series #1 for outer loop vectorization support in LV
using VPlan. (RFC: http://lists.llvm.org/pipermail/llvm-dev/2017-December/119523.html).

This patch introduces a plain CFG simplification step during H-CFG
construction. This simplification is aimed at preparing the CFG to
introduce VPLoopRegions in the H-CFG (subsequent patch, working on it).
It consists of splitting some VPBasicBlocks that otherwise would belong to
more than one region.


Repository:
  rL LLVM

https://reviews.llvm.org/D48818

Files:
  lib/Transforms/Vectorize/VPlan.cpp
  lib/Transforms/Vectorize/VPlan.h
  lib/Transforms/Vectorize/VPlanHCFGBuilder.cpp
  lib/Transforms/Vectorize/VPlanHCFGBuilder.h
  unittests/Transforms/Vectorize/VPlanHCFGTest.cpp

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