[all-commits] [llvm/llvm-project] 59ef94: [SLP]Do not include the cost of and -1, <v> and em...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 59ef94d7cf3cb4f5aac514a72d00d1f0fa4a9fb3
      https://github.com/llvm/llvm-project/commit/59ef94d7cf3cb4f5aac514a72d00d1f0fa4a9fb3
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2024-05-01 (Wed, 01 May 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/RISCV/minbw-with-and-and-scalar-trunc.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/trunc-to-large-than-bw.ll

  Log Message:
  -----------
  [SLP]Do not include the cost of and -1, <v> and emit just <v> after MinBitWidth.

After minbitwidth analysis, and <v>, (power_of_2 - 1 const) can be
transformed into just an <v>, (all_ones const), which can be ignored at
the cost estimation and at the codegen. x264 benchmark has this pattern.

Reviewers: RKSimon

Reviewed By: RKSimon

Pull Request: https://github.com/llvm/llvm-project/pull/90739



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