[all-commits] [llvm/llvm-project] b0b886: [VPlan] Add initial anlysis to infer scalar type o...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0b88643a1facc4fcb06783e295de3d4a91dc924
      https://github.com/llvm/llvm-project/commit/b0b88643a1facc4fcb06783e295de3d4a91dc924
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2023-10-27 (Fri, 27 Oct 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/CMakeLists.txt
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    A llvm/lib/Transforms/Vectorize/VPlanAnalysis.cpp
    A llvm/lib/Transforms/Vectorize/VPlanAnalysis.h
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

  Log Message:
  -----------
  [VPlan] Add initial anlysis to infer scalar type of VPValues. (#69013)

This patch adds initial type inferrence for VPValues. It infers the
scalar type of a VPValue, by bottom-up traversing through defining
recipes until root nodes with known types are reached (e.g. live-ins or
load recipes). The types are then propagated top down through
operations.

This is intended as building block for a VPlan-based cost model, which
will need access to type information for VPValues/recipes.

Initial testing is done by asserting the inferred type matches the type
of the result value generated for a widen and replicate recipes.