[all-commits] [llvm/llvm-project] 334a36: [AArch64][Darwin][SME] Don't try to save VG to the...

[Amara Emerson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 334a366ba792adb41ccf43457b65ac88aa37f178
      https://github.com/llvm/llvm-project/commit/334a366ba792adb41ccf43457b65ac88aa37f178
  Author: Amara Emerson <amara at apple.com>
  Date:   2024-08-13 (Tue, 13 Aug 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    A llvm/test/CodeGen/AArch64/sme-darwin-no-sve-vg.ll

  Log Message:
  -----------
  [AArch64][Darwin][SME] Don't try to save VG to the stack for unwinding.

On Darwin we don't have any hardware that has SVE support, only SME.
Therefore we don't need to save VG for unwinders and can safely omit it.

This also fixes crashes introduced since this feature landed since Darwin's
compact unwind code can't handle the presence of VG anyway.

rdar://131072344



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