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llvm / llvm-project / c98e41f8586bc43033d29ef3ec0f9a2f79b3ec32
commitc98e41f8586bc43033d29ef3ec0f9a2f79b3ec32[log] [tgz]
authorLuke Lau <luke@igalia.com>Mon Oct 07 17:40:32 2024 +0800
committerGitHub <noreply@github.com>Mon Oct 07 17:40:32 2024 +0800
treef62c4eb54a597214fa728fb2e39c9b59d1d7fbe0
parent3137b6a263d2549a520690606e286ab4c8e3c9e5 [diff]
[LegalizeVectorTypes] Always widen fabs (#111298)

fabs and fneg are similar nodes in that they can always be expanded to
integer ops, but currently they diverge when widened.

If the widened vector fabs is marked as expand (and the corresponding
scalar type is too), LegalizeVectorTypes thinks that it may be turned
into a libcall and so will unroll it to avoid the overhead on the undef
elements.

However unlike the other ops in that list like fsin, fround, flog etc.,
an fabs marked as expand will never be legalized into a libcall. Like
fneg, it can always be expanded into an integer op.

This moves it below unrollExpandedOp to bring it in line with fneg,
which fixes an issue on RISC-V with f16 fabs being unexpectedly
scalarized when there's no zfhmin.
2 files changed
tree: f62c4eb54a597214fa728fb2e39c9b59d1d7fbe0
  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. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
README.md

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