[all-commits] [llvm/llvm-project] 45b526: [LV] Honor uniform-after-vectorization in setVecto...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 45b526afa26e76e0c351e947ac8f0e4b55aa760b
      https://github.com/llvm/llvm-project/commit/45b526afa26e76e0c351e947ac8f0e4b55aa760b
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-10-06 (Sun, 06 Oct 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    A llvm/test/Transforms/LoopVectorize/X86/replicate-uniform-call.ll

  Log Message:
  -----------
  [LV] Honor uniform-after-vectorization in setVectorizedCallDecision.

The legacy cost model always computes the cost for uniforms as cost of
VF = 1, but VPWidenCallRecipes would be created, as
setVectorizedCallDecisions would not consider uniform calls.

Fix setVectorizedCallDecision to set to Scalarize, if the call is
uniform-after-vectorization.

This fixes a bug in VPlan construction uncovered by the VPlan-based
cost model.

Fixes https://github.com/llvm/llvm-project/issues/111040.



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