llvm-project

2f55123c - [VPlan] Handle early exit before forming regions. (NFC) (#138393)

[VPlan] Handle early exit before forming regions. (NFC) (#138393) Move early-exit handling up front to original VPlan construction, before introducing early exits. This builds on https://github.com/llvm/llvm-project/pull/137709, which adds exiting edges to the original VPlan, instead of adding exit blocks later. This retains the exit conditions early, and means we can handle early exits before forming regions, without the reliance on VPRecipeBuilder. Once we retain all exits initially, handling early exits before region construction ensures the regions are valid; otherwise we would leave edges exiting the region from elsewhere than the latch. Removing the reliance on VPRecipeBuilder removes the dependence on mapping IR BBs to VPBBs and unblocks predication as VPlan transform: https://github.com/llvm/llvm-project/pull/128420. Depends on https://github.com/llvm/llvm-project/pull/137709 (included in PR). PR: https://github.com/llvm/llvm-project/pull/138393