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James Molloy
3eb64280e1
[LoopReroll] Alter the data structures used during reroll validation.
The validation algorithm used an incremental approach, building each iteration's data structures temporarily, validating them, then adding them to a global set. This does not scale well to having multiple sets of Root nodes, as the set of instructions used in each iteration is the union over all the root nodes. Therefore, refactor the logic to create a single, simple container to which later logic then refers. This makes it simpler control-flow wise to make the creation of the container more complex with the addition of multiple root sets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227499 91177308-0d34-0410-b5e6-96231b3b80d8
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