llvm-project

55bd4585 - [BOLT] Gadget scanner: optionally assume auth traps on failure (#139778)

[BOLT] Gadget scanner: optionally assume auth traps on failure (#139778) On AArch64 it is possible for an auth instruction to either return an invalid address value on failure (without FEAT_FPAC) or generate an error (with FEAT_FPAC). It thus may be possible to never emit explicit pointer checks, if the target CPU is known to support FEAT_FPAC. This commit implements an --auth-traps-on-failure command line option, which essentially makes "safe-to-dereference" and "trusted" register properties identical and disables scanning for authentication oracles completely.