[PATCH] D82438: [SimplifyCFG] Cost required selects

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: spatel, reames, RKSimon, lebedev.ri.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

Before we speculatively execute a basic block, query the cost of inserting the necessary select instructions against the phi folding threshold. For non-trivial insertions, a more accurate decision can probably be made during machine if-conversion.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D82438

Files:
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp
  llvm/test/Transforms/SimplifyCFG/ARM/select-costs.ll

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