llvm-project

72937203 - [VPlan] Create vector header and latch VPBBs in createInitialVPlan (NFC)

[VPlan] Create vector header and latch VPBBs in createInitialVPlan (NFC) The empty header and latch blocks can be created together with the vector loop region. This is in preparation for splitting up the very large tryToBuildVPlanWithVPRecipes into several distinct functions, as suggested multiple times, including in https://github.com/llvm/llvm-project/pull/94760