[all-commits] [llvm/llvm-project] f05fa6: [AArch64] Fix argument passing in reserved registe...

[antangelo via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f05fa6e0cfdc61f29bac94b157a56e048d10efd1
      https://github.com/llvm/llvm-project/commit/f05fa6e0cfdc61f29bac94b157a56e048d10efd1
  Author: antangelo <contact at antangelo.com>
  Date:   2024-06-23 (Sun, 23 Jun 2024)

  Changed paths:
    M clang/include/clang/Basic/AttrDocs.td
    M llvm/lib/Target/AArch64/AArch64CallingConvention.td
    M llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
    M llvm/test/CodeGen/AArch64/preserve_nonecc_call.ll

  Log Message:
  -----------
  [AArch64] Fix argument passing in reserved registers for preserve_nonecc (#96259)

These registers include:
- X19, used by LLVM as the base pointer
- X15 on Windows, where it is used for stack allocation. It can still be
used on Linux/Darwin.
- Adjust FrameLowering scratch register code to not assume X9 is
available if the calling convention is preserve_nonecc. The code will
then pick an unused register as scratch, and allow X9 to continue being
used for argument passing.



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