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llvm / llvm-project / 215e61c08847cd74affe8f90996733f7218c29ad
commit215e61c08847cd74affe8f90996733f7218c29ad[log] [tgz]
authorFabian Ritter <fabian.ritter@amd.com>Thu Jun 26 09:40:04 2025 +0200
committerGitHub <noreply@github.com>Thu Jun 26 09:40:04 2025 +0200
tree61b65219d01284f7ad2b46f4022c53fd971c0f25
parent28aa871dd43428798daf567a668491fbb2714565 [diff]
[AMDGPU][SDAG] Add ISD::PTRADD DAG combines (#142739)

This patch focuses on generic DAG combines, plus an AMDGPU-target-specific one
that is closely connected.

The generic DAG combine is based on a part of PR #105669 by rgwott, which was
adapted from work by jrtc27, arichardson, davidchisnall in the CHERI/Morello
LLVM tree. I added some parts and removed several disjuncts from the
reassociation condition:
- `isNullConstant(X)`, since there are address spaces where 0 is a perfectly
  normal value that shouldn't be treated specially,
- `(YIsConstant && ZOneUse)` and `(N0OneUse && ZOneUse && !ZIsConstant)`, since
  they cause regressions in AMDGPU.

For SWDEV-516125.
6 files changed
tree: 61b65219d01284f7ad2b46f4022c53fd971c0f25
  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
README.md

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