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llvm / llvm-project / 1ac489c8e38ecaeccba7d8826273395eaba2db6c
commit1ac489c8e38ecaeccba7d8826273395eaba2db6c[log] [tgz]
authorPhilip Reames <preames@rivosinc.com>Wed May 07 08:15:44 2025 -0700
committerGitHub <noreply@github.com>Wed May 07 08:15:44 2025 -0700
tree82defe12fa67519fb307f5a727d84eb06a2c6d60
parentb9d6cbd4dc1def3f15b7d5ebb8cb4714bdad22bf [diff]
[RISCV] Initial codegen support for zvqdotq extension (#137039)

This patch adds pattern matching for the basic usages of the dot product
instructions introduced by the experimental zvqdotq extension. It
specifically only handles the case where the pattern is feeding a i32
sum reduction as we need to reassociate the reduction tree to use these
instructions.

The vecreduce_add (sext) and vecreduce_add (zext) cases are included
mostly to exercise the VX matchers. For the generic matching, we fail to
match due to an order of combine issue which results in the bitcast
being separated from the splat.

I chose to do this lowering as an early combine so as to avoid having to
integrate the entire logic into the reduction lowering flow. In
particular, that would get a lot more complicated as we extend this to
handle add-trees feeding the reductions.
4 files changed
tree: 82defe12fa67519fb307f5a727d84eb06a2c6d60
  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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