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llvm / llvm-project / 2b8f82b8308fc9df0a74cdd61a1257d9eb51189c
commit2b8f82b8308fc9df0a74cdd61a1257d9eb51189c[log] [tgz]
authorLuke Lau <luke@igalia.com>Thu Jun 12 23:40:57 2025 +0100
committerGitHub <noreply@github.com>Thu Jun 12 23:40:57 2025 +0100
tree44f13aad551c18960cf73e4e5133f47601353b49
parent2ee8fdbfddcca86ac079104718e6fda3aabed0eb [diff]
[RISCV] Remove implicit $vl def on vleNff pseudos (#143935)

In #90049 we removed the side effect flag on the vleNff pseudos with the
reasoning that we modelled the effect of setting vl as an output
operand.

This extends this further by removing the implicit def on vl, inserting
it back in RISCVInsertVSETVLI when we also emit the PseudoReadVL.

The motiviation for this is to make it easier to handle vleff in more
places in RISCVVectorPeephole in a follow up patch, which in turn will
make migrating the last vmerge peephole over from RISCVISelDAGToDAG
easier.

Some of these tests claim that the vleff shouldn't be deleted when none
of its values are used, but these are from the initial commit in
3b5430eb0dad5. I'm not sure if these still hold today?

This also moves the fault-only-first predicate to
RISCVInstrPredicates.td since we can't rely on the implicit vl operand
anymore.
10 files changed
tree: 44f13aad551c18960cf73e4e5133f47601353b49
  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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