[all-commits] [llvm/llvm-project] 54b33e: [VPlan] Add opcode to create step for wide inducti...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 54b33eba1657f4bfe11db5cc1c562a2d2172c7e3
      https://github.com/llvm/llvm-project/commit/54b33eba1657f4bfe11db5cc1c562a2d2172c7e3
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-04-14 (Mon, 14 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp

  Log Message:
  -----------
  [VPlan] Add opcode to create step for wide inductions. (#119284)

This patch adds a WideIVStep opcode that can be used to create a vector
with the steps to increment a wide induction. The opcode has 2 operands
* the vector step
* the scale of the vector step

The opcode is later converted into a sequence of recipes that convert
the scale and step to the target type, if needed, and then multiply
vector step by scale.

This simplifies code that needs to materialize step vectors, e.g.
replacing wide IVs as follow up to
https://github.com/llvm/llvm-project/pull/108378 with an increment of
the wide IV step.

PR: https://github.com/llvm/llvm-project/pull/119284



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