[all-commits] [llvm/llvm-project] 70535f: [VPlan] Replace IR based truncateToMinimalBitwidth...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 70535f5e609f747c28cfef699eefb84581b0aac0
      https://github.com/llvm/llvm-project/commit/70535f5e609f747c28cfef699eefb84581b0aac0
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2023-12-02 (Sat, 02 Dec 2023)

  Changed paths:
    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/test/Transforms/LoopVectorize/AArch64/deterministic-type-shrinkage.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/loop-vectorization-factors.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/type-shrinkage-insertelt.ll
    M llvm/test/Transforms/LoopVectorize/scalable-trunc-min-bitwidth.ll
    M llvm/test/Transforms/LoopVectorize/trunc-shifts.ll

  Log Message:
  -----------
  [VPlan] Replace IR based truncateToMinimalBitwidths with VPlan version.

This patch replaces the IR based truncateToMinimalBitwidths with a VPlan
version. This has 3 benefits:
1) the VPlan-based version is simpler; we don't need to implement
   special codegen for each supported instruction type like the IR based
   one.
2) Removes a dependency on the cost-model after VPlan execution and
3) Removes a use of getVPValue that uses underlying values after VPlan
   execution (See removed FIXME).

Depends on D149081.

Depends on D149079.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D149903