[all-commits] [llvm/llvm-project] c5253a: [AArch64] Restore Z-registers before P-registers (...

[CarolineConcatto via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c5253aa136ac6ba683b367b2bae0dde1a543d1df
      https://github.com/llvm/llvm-project/commit/c5253aa136ac6ba683b367b2bae0dde1a543d1df
  Author: CarolineConcatto <caroline.concatto at arm.com>
  Date:   2024-02-22 (Thu, 22 Feb 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
    M llvm/test/CodeGen/AArch64/framelayout-sve-calleesaves-fix.mir
    M llvm/test/CodeGen/AArch64/framelayout-sve.mir
    M llvm/test/CodeGen/AArch64/sme-streaming-compatible-interface.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
    M llvm/test/CodeGen/AArch64/sme2-intrinsics-ld1.ll
    M llvm/test/CodeGen/AArch64/sme2-intrinsics-ldnt1.ll
    M llvm/test/CodeGen/AArch64/stack-probing-sve.ll
    M llvm/test/CodeGen/AArch64/sve-alloca.ll
    M llvm/test/CodeGen/AArch64/sve-calling-convention-mixed.ll
    M llvm/test/CodeGen/AArch64/sve-tailcall.ll
    M llvm/test/CodeGen/AArch64/unwind-preserved.ll

  Log Message:
  -----------
  [AArch64] Restore Z-registers before P-registers (#79623) (#82492)

This is needed by PR#77665[1] that uses a P-register while restoring
Z-registers.

The reverse for SVE register restore in the epilogue was added to
guarantee performance, but further work was done to improve sve frame
restore and besides that the schedule also may change the order of the
restore, undoing the reverse restore.

This also fix the problem reported in (PR #79623) on Windows with
std::reverse and .base().

[1]https://github.com/llvm/llvm-project/pull/77665



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