Florian Hahn 3fcfce4c5e Reapply "[LoopPeel] Implement initial peeling off the last loop iteration. (#139551)" ...

This reverts the revert commit bf92b127d2.

This adds missing initialization of PeelLast in gatherPeelingPreferences.

Original message:
Generalize countToEliminateCompares to also consider peeling off the
last iteration if it eliminates a compare.

At the moment, codegen for peeling off the last iteration is quite
restrictive and callers have to make sure that the exit condition can be
adjusted when peeling and that the loop executes at least 2 iterations.

Both will be relaxed in follow-ups.

PR: https://github.com/llvm/llvm-project/pull/139551

2025-05-17 10:51:05 +01:00

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