[all-commits] [llvm/llvm-project] 4250be: [AArch64][SME] Support Windows/stack probes in Mac...

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/users/MacDue/windows-sme
  Home:   https://github.com/llvm/llvm-project
  Commit: 4250bec812603b7520dc36f26d68a2c3834ad6cd
      https://github.com/llvm/llvm-project/commit/4250bec812603b7520dc36f26d68a2c3834ad6cd
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2025-07-17 (Thu, 17 Jul 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.h
    M llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td
    M llvm/lib/Target/AArch64/MachineSMEABIPass.cpp
    A llvm/test/CodeGen/AArch64/sme-lazy-save-windows.ll
    M llvm/test/CodeGen/AArch64/sme-za-lazy-save-buffer.ll

  Log Message:
  -----------
  [AArch64][SME] Support Windows/stack probes in MachineSMEABIPass

On Windows or with stack probes on other targets, additional code needs
to be inserted after dynamic stack allocations to validate stack
accesses and/or ensure enough stack space has been allocated.

Rather than handle this case in the MachineSMEABIPass (like we do for
the standard case), we allocate the memory for the lazy save buffer in
SelectionDAG, which allows the existing expansions to emit the correct
code.

Note: This means in these cases, we may allocate a lazy save buffer when
there are no lazy saves present in the function (as we have to allocate
the buffer before the MachineSMEABIPass runs).

Change-Id: If89ab54c4de79f6fe5513a6b387e9e349f7bc7d1



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