tree d25cc47cd4185ef4154a21f857457b3e3d8c99f5
parent b46f16c8d7f4a9e37271cdc4717dd858a4c813dc
author Florian Hahn <flo@fhahn.com> 1744372259 +0100
committer GitHub <noreply@github.com> 1744372259 +0100
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[VPlan] Add hasScalarTail, use instead of !CM.foldTailByMasking() (NFC). (#134674)

Now that VPlan is able to fold away redundant branches to the scalar
preheader, we can directly check in VPlan if the scalar tail may
execute. hasScalarTail returns true if the tail may execute.

We know that the scalar tail won't execute if the scalar preheader
doesn't have any predecessors, i.e. is not reachable.

This removes some late uses of the legacy cost model.

PR: https://github.com/llvm/llvm-project/pull/134674