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llvm / llvm-project / 9de657abaf3d60918cb10edbbada3c4b520b0b0c
commit9de657abaf3d60918cb10edbbada3c4b520b0b0c[log] [tgz]
authorSudharsan Veeravalli <quic_svs@quicinc.com>Fri Jul 11 12:16:11 2025 +0530
committerGitHub <noreply@github.com>Fri Jul 11 12:16:11 2025 +0530
tree7281e0e76c952080c38a2c9b68f4ceb7431f84db
parenta516c60ec34682db0d35a20fe3e299a9ae17a356 [diff]
[RISCV] Add ISel patterns for Xqciac QC.MULIADD instruction (#147661)

Add basic isel patterns for the multiple accumulate QC.MULIADD
instruction.

While most case work with just the TD file pattern, there are few cases
which need to be handled in ISelLowering depending on the immediate we
are multiplying with:

- imm + 1 , imm - 1, 1 - imm, -1 - imm are a power of 2 --> these become
slli and add/sub
- immediate is 2^n - 2 ^m --> this becomes (add/sub (shl X, C1), (shl X,
C2))
- imm - 2, imm - 4, imm - 6 is a power of 2 --> these use shxadd when
zba is enabled

The patch does not decompose mul if Xqciac is present, for the above
conditions. There could be cases where this may not beneficial which I
plan to address in follow up patches.
3 files changed
tree: 7281e0e76c952080c38a2c9b68f4ceb7431f84db
  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. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-format-ignore
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
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