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llvm / llvm-project / 1a44f38d2af8724e9819f03d4b76a50615217a8d
commit1a44f38d2af8724e9819f03d4b76a50615217a8d[log] [tgz]
authorJames Newling <james.newling@gmail.com>Thu May 01 15:50:55 2025 -0700
committerGitHub <noreply@github.com>Thu May 01 15:50:55 2025 -0700
tree670c93ea3ea0e5fc312ec2239b61dd76181fb548
parented8d4fe0b1d8088bd1a4f99f77afe33f435ef668 [diff]
[mlir][vector] Canonicalize/fold 'order preserving' transposes (#135841)

Handles special case where transpose doesn't permute any non-1
dimensions (and so is effectively a shape_cast) and is adjacent to a
shape_cast that it can fold into. For example

```
%1 = vector.transpose %0, [1, 0, 3, 2] : vector<4x1x1x6xf32> to vector<1x4x6x1xf32>
```

can be folded into an adjacent shape_cast. An alternative to this PR
would be to canonicalize such transposes to shape_casts directly, but I
think it'll be difficult getting consensus that shape_cast is 'more
canonical' than transpose, so this PR compromises with the less
opinionated claim that

1) shape_cast is more canonical than shape_cast(transpose)
2) shape_cast is more canonical than transpose(shape_cast)

The pattern `ConvertIllegalShapeCastOpsToTransposes` that is specific to
transposes with scalable dimensions reverses the canonicalization added
here, so I've I've disabled this canonicalization for scalable vectors
3 files changed
tree: 670c93ea3ea0e5fc312ec2239b61dd76181fb548
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

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