[all-commits] [llvm/llvm-project] 0501c1: [X86] Add isFreeToSplitVector helper to detect nod...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0501c1603f5dbbd81627ee1c25cff470b867a13f
      https://github.com/llvm/llvm-project/commit/0501c1603f5dbbd81627ee1c25cff470b867a13f
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-06-29 (Thu, 29 Jun 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp

  Log Message:
  -----------
  [X86] Add isFreeToSplitVector helper to detect nodes that we can freely split/extract subvectors from.

Helper wrapper around the existing collectConcatOps method.


  Commit: 34961c600d477386050828de4261d3c3a7cb809c
      https://github.com/llvm/llvm-project/commit/34961c600d477386050828de4261d3c3a7cb809c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-06-29 (Thu, 29 Jun 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/avx512-ext.ll
    M llvm/test/CodeGen/X86/concat-cast.ll
    M llvm/test/CodeGen/X86/masked_store_trunc_usat.ll
    M llvm/test/CodeGen/X86/vector-compare-results.ll
    M llvm/test/CodeGen/X86/vector-pack-256.ll
    M llvm/test/CodeGen/X86/vector-pack-512.ll
    M llvm/test/CodeGen/X86/vector-sext.ll
    M llvm/test/CodeGen/X86/vector-trunc-usat.ll

  Log Message:
  -----------
  [X86] LowerTRUNCATE - attempt to use PACKSS/PACKUS on AVX512 targets if the truncation source is concatenating from smaller subvectors

Don't just use AVX512 truncation ops if PACKSS/PACKUS can do this more cheaply


Compare: https://github.com/llvm/llvm-project/compare/d662865f7677...34961c600d47