[all-commits] [llvm/llvm-project] dff114: [ARM] Optimise non-ABI frame pointers (#110286)

[Oliver Stannard via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dff114b3565e4c981fcb40f24f72a0cb426294fe
      https://github.com/llvm/llvm-project/commit/dff114b3565e4c981fcb40f24f72a0cb426294fe
  Author: Oliver Stannard <oliver.stannard at arm.com>
  Date:   2024-10-28 (Mon, 28 Oct 2024)

  Changed paths:
    M llvm/lib/Target/ARM/ARMFrameLowering.cpp
    M llvm/lib/Target/ARM/ARMSubtarget.cpp
    M llvm/lib/Target/ARM/ARMSubtarget.h
    M llvm/test/CodeGen/Thumb2/bti-pac-replace-2.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-basic.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-frame-chain.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-indirect-tail-call.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-outliner-3.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-outliner-4.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-overalign.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-stack-arg.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-varargs-1.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-varargs-2.ll
    M llvm/test/CodeGen/Thumb2/pacbti-m-vla.ll

  Log Message:
  -----------
  [ARM] Optimise non-ABI frame pointers (#110286)

With -fomit-frame-pointer, even if we set up a frame pointer for other
reasons (e.g. variable-sized or over-aligned stack allocations), we
don't need to create an ABI-compliant frame record. This means that we
can save all of the general-purpose registers in one push, instead of
splitting it to ensure that the frame pointer and link register are
adjacent on the stack, saving two instructions per function.



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