[AMDGPU] Enable unaligned scratch accesses (#110219)

This allows us to emit wide generic and scratch memory accesses when we
do not have alignment information. In cases where accesses happen to be
properly aligned or where generic accesses do not go to scratch memory,
this improves performance of the generated code by a factor of up to 16x
and reduces code size, especially when lowering memcpy and memmove
intrinsics.

Also: Make the use of the FeatureUnalignedScratchAccess feature more
consistent: FeatureUnalignedScratchAccess and EnableFlatScratch are now
orthogonal, whereas, before, code assumed that the latter implies the
former at some places.

Part of SWDEV-455845.
15 files changed
tree: bb0c9dc8ea199d3fd9906a17d0f248ff757a1581
  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

The LLVM Compiler Infrastructure

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