[PATCH] D156784: [AArch64][PAC] Declare FPAC subtarget feature

[Anatoly Trosinenko via Phabricator via cfe-commits]

atrosinenko added a comment.

As discussed in D156716 <https://reviews.llvm.org/D156716>, it is not clear if I have to add FeatureFPAC to every relevant CPU. Maybe it is worth conservatively assuming that this feature should only be enabled manually by the user as a precaution against "I have CPU core X but it is not listed, so let's use cpu=Y because X supports all the instructions supported by Y //(but not FEAT_FPAC)//" - that would not cause any obvious run-time crashes under normal operation, but would make the code less secure.


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https://reviews.llvm.org/D156784