[all-commits] [llvm/llvm-project] af0aa9: [AArch64][PAC] Rework the expansion of AUT/AUTPAC ...

[Anatoly Trosinenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: af0aa9440f1121bd5041a3dd7abef0d78b0f91cd
      https://github.com/llvm/llvm-project/commit/af0aa9440f1121bd5041a3dd7abef0d78b0f91cd
  Author: Anatoly Trosinenko <atrosinenko at accesssoftek.com>
  Date:   2026-07-18 (Sat, 18 Jul 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/test/CodeGen/AArch64/ptrauth-intrinsic-auth-resign-with-blend.ll

  Log Message:
  -----------
  [AArch64][PAC] Rework the expansion of AUT/AUTPAC pseudos (#169699)

Refactor `AArch64AsmPrinter::emitPtrauthAuthResign` to improve
readability and tune the conditions when `emitPtrauthDiscriminator` is
allowed to clobber address discriminator operands.

When resigning, do not clobber address discriminator register used for
authentication if it is also used for signing. Such clobbering would
prevent passing raw, 64-bit value as the new discriminator. Clarify
other corner cases of clobbering address discriminator operands.

Reuse `enum PtrauthCheckMode` instead of separate `ShouldCheck` and
`ShouldTrap` flags and drop its `Default` enumerator.



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