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llvm / llvm-project / cf51a5e872686396bc4ac33213424e3e395dd189
commitcf51a5e872686396bc4ac33213424e3e395dd189[log] [tgz]
authorBenjamin Maxwell <benjamin.maxwell@arm.com>Wed Nov 12 10:58:05 2025 +0000
committerGitHub <noreply@github.com>Wed Nov 12 10:58:05 2025 +0000
tree080467f8d8fd0ca2fabadc2e38d46af4a7ee8d82
parent0957656a4077b6a70f3e3dbb3a011b40d53e1a97 [diff]
[AArch64][SME] Enable split SVE for hazard padding in SVE CC functions (#166561)

This patch enables `aarch64-split-sve-objects` to handle hazard padding
in functions that use the SVE CC even when there are no predicate
spills/locals.

This improves the codegen over the base hazard padding implementation,
as rather than placing the padding in the callee-save area, it is placed
at the start of the ZPR area.

E.g., Current lowering:

```
sub sp, sp, #1040
str x29, [sp, #1024] // 8-byte Folded Spill
addvl sp, sp, #-1
str z8, [sp] // 16-byte Folded Spill
sub sp, sp, #1040
```

New lowering:

```
str x29, [sp, #-16]! // 8-byte Folded Spill
sub sp, sp, #1024
addvl sp, sp, #-1
str z8, [sp] // 16-byte Folded Spill
sub sp, sp, #1040
```

This also re-enables paired stores for GPRs (as the offsets no longer
include the hazard padding).
3 files changed
tree: 080467f8d8fd0ca2fabadc2e38d46af4a7ee8d82
  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. libsycl/
  16. libunwind/
  17. lld/
  18. lldb/
  19. llvm/
  20. llvm-libgcc/
  21. mlir/
  22. offload/
  23. openmp/
  24. orc-rt/
  25. polly/
  26. runtimes/
  27. third-party/
  28. utils/
  29. .clang-format
  30. .clang-format-ignore
  31. .clang-tidy
  32. .git-blame-ignore-revs
  33. .gitattributes
  34. .gitignore
  35. .mailmap
  36. CODE_OF_CONDUCT.md
  37. CONTRIBUTING.md
  38. LICENSE.TXT
  39. pyproject.toml
  40. README.md
  41. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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