[all-commits] [llvm/llvm-project] 9dfdbd: [SLP]Improve tryToGatherExtractElements by using p...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9dfdbd788707edc8c39eb2bff16004aba1f3586b
      https://github.com/llvm/llvm-project/commit/9dfdbd788707edc8c39eb2bff16004aba1f3586b
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2023-11-03 (Fri, 03 Nov 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/AArch64/extractelements-to-shuffle.ll
    M llvm/test/Transforms/SLPVectorizer/X86/crash_clear_undefs.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hadd-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hadd.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hsub-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hsub.ll
    M llvm/test/Transforms/SLPVectorizer/X86/reused-extractelements.ll

  Log Message:
  -----------
  [SLP]Improve tryToGatherExtractElements by using per-register analysis.

Currently tryToGatherExtractElements function analyzes the whole vector,
regrdless number of actual registers, used in this vector. It may
prevent some optimizations, because per-register analysis may allow to
simplify the final code by reusing more already emitted vectors and
better shuffles.

Differential Revision: https://reviews.llvm.org/D148855