[all-commits] [llvm/llvm-project] 38376d: [VPlan] Build initial VPlan 0 using HCFGBuilder fo...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 38376dee92224c6657ef6d88413bfc77f4441268
      https://github.com/llvm/llvm-project/commit/38376dee92224c6657ef6d88413bfc77f4441268
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-02-18 (Tue, 18 Feb 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    M llvm/lib/Transforms/Vectorize/VPlanHCFGBuilder.cpp
    M llvm/lib/Transforms/Vectorize/VPlanHCFGBuilder.h
    M llvm/test/Transforms/LoopVectorize/RISCV/riscv-vector-reverse.ll

  Log Message:
  -----------
  [VPlan] Build initial VPlan 0 using HCFGBuilder for inner loops. (NFC) (#124432)

Use HCFGBuilder to build an initial VPlan 0, which wraps all input
instructions in VPInstructions and update tryToBuildVPlanWithVPRecipes
to replace the VPInstructions with widened recipes.

At the moment, widened recipes are created based on the underlying
instruction of the VPInstruction. Masks are also still created based on
the input IR basic blocks and the loop CFG is flattened in the main loop
processing the VPInstructions.

This patch also incldues support for Switch instructions in HCFGBuilder
using just a VPInstruction with Instruction::Switch opcode.

There are multiple follow-ups planned:
 * Perform predication on the VPlan directly,
* Unify code constructing VPlan 0 to be shared by both inner and outer
loop code paths.
 * Construct VPlan 0 once, clone subsequent ones for VFs

PR: https://github.com/llvm/llvm-project/pull/124432



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