Florian Hahn 0fa666eced
[VPlan] Add VPDerivedIVRecipe, use for VPScalarIVStepsRecipe.
This patch splits off the logic to transform the canonical IV to a
a value for an induction with a different start and step. This
transformation only needs to be done once (independent of VF/UF) and
enables sinking of VPScalarIVStepsRecipe as follow-up.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D133758
2022-11-28 16:32:31 +00:00
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