Florian Hahn 0d736e296c [VPlan] Add getSCEVExprForVPValue util, use to get trip count SCEV (NFC) (#94464) ...

Add a new getSCEVExprForVPValue utility which can be used to get a SCEV
expression for a VPValue. The initial implementation only returns SCEVs
for live-in IR values (by constructing a SCEV based on the live-in IR
value) and VPExpandSCEVRecipe. This is enough to serve its first use,
getting a SCEV for a VPlan's trip count, but will be extended in the
future.

It also removes createTripCountSCEV, as the new helper can be used to
retrieve the SCEV from the VPlan.

PR: https://github.com/llvm/llvm-project/pull/94464

2024-09-18 14:41:56 +01:00

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