[all-commits] [llvm/llvm-project] 3b7070: [AArch64][PAC] Reduce the size of synchronous CFI

[Igor Kudrin via All-commits]

  Branch: refs/heads/users/igorkudrin/sync-cfi-negate-ra-state
  Home:   https://github.com/llvm/llvm-project
  Commit: 3b707008cf84892507490094e3bd20a1f5a6b70b
      https://github.com/llvm/llvm-project/commit/3b707008cf84892507490094e3bd20a1f5a6b70b
  Author: Igor Kudrin <ikudrin at accesssoftek.com>
  Date:   2024-07-11 (Thu, 11 Jul 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64PointerAuth.cpp
    M llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-cfi.ll
    M llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-diff-scope-same-key.ll
    M llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-non-leaf.ll
    M llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-regsave.mir
    M llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-same-scope-diff-key.ll
    M llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-subtarget.ll
    M llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-thunk.ll
    M llvm/test/CodeGen/AArch64/pacbti-llvm-generated-funcs-2.ll
    M llvm/test/CodeGen/AArch64/sign-return-address-cfi-negate-ra-state.ll
    M llvm/test/CodeGen/AArch64/sign-return-address-pauth-lr.ll
    M llvm/test/CodeGen/AArch64/sign-return-address.ll

  Log Message:
  -----------
  [AArch64][PAC] Reduce the size of synchronous CFI

For synchronous unwind tables, the call frame information can be
slightly reduced by bundling the `.cfi_negate_ra_state` instruction
with other CFI instructions in the prolog, saving 1 byte per function
used for `DW_CFA_advance_loc`.

This was suggested in [D156428](https://reviews.llvm.org/D156428#4554317).



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