[all-commits] [llvm/llvm-project] 256c6b: [VPlan] Model pre-header explicitly.

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 256c6b0ba14e8a7ab6373b61b7193ea8c0a3651c
      https://github.com/llvm/llvm-project/commit/256c6b0ba14e8a7ab6373b61b7193ea8c0a3651c
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-04-09 (Sat, 09 Apr 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-widen-gep.ll
    M llvm/test/Transforms/LoopVectorize/X86/consecutive-ptr-uniforms.ll
    M llvm/test/Transforms/LoopVectorize/X86/small-size.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll
    M llvm/test/Transforms/LoopVectorize/icmp-uniforms.ll
    M llvm/test/Transforms/LoopVectorize/vplan-dot-printing.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing.ll
    M llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge-vf1.ll
    M llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll

  Log Message:
  -----------
  [VPlan] Model pre-header explicitly.

This patch extends the scope of VPlan to also model the pre-header.
The pre-header can be used to place recipes that should be code-gen'd
outside the loop, like SCEV expansion.

Depends on D121623.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D121624