[all-commits] [llvm/llvm-project] 4597bf: BasicAAResult::constantOffsetHeuristic - pass APIn...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 4597bfddf11b7d9dcf373525d0bc889bcc212b13
      https://github.com/llvm/llvm-project/commit/4597bfddf11b7d9dcf373525d0bc889bcc212b13
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-07-09 (Thu, 09 Jul 2020)

  Changed paths:
    M llvm/include/llvm/Analysis/BasicAliasAnalysis.h
    M llvm/lib/Analysis/BasicAliasAnalysis.cpp

  Log Message:
  -----------
  BasicAAResult::constantOffsetHeuristic - pass APInt arg as const reference. NFCI.

Avoids unnecessary APInt copies and silences clang tidy warning.


  Commit: f54402b63a4f5b0b4b15e0f82ce8ff8501b206e6
      https://github.com/llvm/llvm-project/commit/f54402b63a4f5b0b4b15e0f82ce8ff8501b206e6
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-07-09 (Thu, 09 Jul 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/avx-vperm2x128.ll
    M llvm/test/CodeGen/X86/avx512-intrinsics-fast-isel.ll
    M llvm/test/CodeGen/X86/known-signbits-vector.ll
    M llvm/test/CodeGen/X86/packss.ll
    M llvm/test/CodeGen/X86/var-permute-256.ll
    M llvm/test/CodeGen/X86/vector-pack-256.ll
    M llvm/test/CodeGen/X86/x86-interleaved-access.ll

  Log Message:
  -----------
  [X86][AVX] Attempt to fold extract_subvector(shuffle(X)) -> extract_subvector(X)

If we're extracting a subvector from a shuffle that is shuffling entire subvectors we can peek through and extract the subvector from the shuffle source instead.

This helps remove some cases where concat_vectors(extract_subvector(),extract_subvector()) legalizations has resulted in BLEND/VPERM2F128 shuffles of the subvectors.


Compare: https://github.com/llvm/llvm-project/compare/97106f9d80f6...f54402b63a4f