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llvm / llvm-project / 8bc2d19c13c3a0aa0bffe82596f75f25bed5004f
commit8bc2d19c13c3a0aa0bffe82596f75f25bed5004f[log] [tgz]
authorSimon Pilgrim <llvm-dev@redking.me.uk>Thu Mar 28 19:49:02 2024 +0000
committerSimon Pilgrim <llvm-dev@redking.me.uk>Tue Apr 02 18:38:37 2024 +0100
treea1f8490a372e1a3149684483889fbbcd3a19880f
parent82be6e186b5f88779325c5ede99ac714b2cfc4fa [diff]
[X86] canonicalizeShuffleWithOp - don't fold VPERMI(BINOP(X,Y)) -> BINOP(VPERMI(X),VPERMI(Y))

VPERMI (VPERMQ/PD) is nearly always lane-crossing and poorly merges with target shuffles (other than itself).

For now, I've restricted VPERMI to only merge with itself, constants, loads and splats.

We might be able to merge with a few other special cases (AND/ANDNP with constant?), which could help the shuffle-vs-trunc-256.ll AVX512VL regression, but since that now gives similar codegen to the other AVX512 variants, I'd prefer to improve the shuffle lowering for that properly.
4 files changed
tree: a1f8490a372e1a3149684483889fbbcd3a19880f
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. openmp/
  21. polly/
  22. pstl/
  23. runtimes/
  24. third-party/
  25. utils/
  26. .clang-format
  27. .clang-tidy
  28. .git-blame-ignore-revs
  29. .gitattributes
  30. .gitignore
  31. .mailmap
  32. CODE_OF_CONDUCT.md
  33. CONTRIBUTING.md
  34. LICENSE.TXT
  35. pyproject.toml
  36. README.md
  37. SECURITY.md
README.md

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