[all-commits] [llvm/llvm-project] 93c8e0: [AArch64][SME] Save VG for unwind info when changi...

[Kerry McLaughlin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 93c8e0f2eb347e219077ddd4428faf9a89fff480
      https://github.com/llvm/llvm-project/commit/93c8e0f2eb347e219077ddd4428faf9a89fff480
  Author: Kerry McLaughlin <kerry.mclaughlin at arm.com>
  Date:   2024-06-13 (Thu, 13 Jun 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.h
    M llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.cpp
    M llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.h
    M llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td
    M llvm/test/CodeGen/AArch64/outlining-with-streaming-mode-changes.ll
    M llvm/test/CodeGen/AArch64/sme-call-streaming-compatible-to-normal-fn-wihout-sme-attr.ll
    M llvm/test/CodeGen/AArch64/sme-disable-gisel-fisel.ll
    M llvm/test/CodeGen/AArch64/sme-lazy-save-call.ll
    M llvm/test/CodeGen/AArch64/sme-pstate-sm-changing-call-disable-coalescing.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-body-streaming-compatible-interface.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-body.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-compatible-interface.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-mode-changing-call-disable-stackslot-scavenging.ll
    A llvm/test/CodeGen/AArch64/sme-vg-to-stack.ll
    M llvm/test/CodeGen/AArch64/streaming-compatible-memory-ops.ll

  Log Message:
  -----------
  [AArch64][SME] Save VG for unwind info when changing streaming-mode (#83301)

If a function requires any streaming-mode change, the vector granule
value must be stored to the stack and unwind info must also describe the
save of VG to this location.

This patch adds VG to the list of callee-saved registers and increases
the
callee-saved stack size if the function requires streaming-mode changes.
A new type is added to RegPairInfo, which is also used to skip restoring
the register used to spill the VG value in the epilogue.

See
https://github.com/ARM-software/abi-aa/blob/main/aadwarf64/aadwarf64.rst



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