[PATCH] D152484: [KCFI] Fix hash offset calculation in Thumb mode

[Simon Tatham via Phabricator via llvm-commits]

simon_tatham accepted this revision.
simon_tatham added a comment.

Thanks! This should fix https://github.com/llvm/llvm-project/issues/62936.

I agree that it's better to do the fix here, instead of adding dedicated support in the backend the way AArch64 does it, because as far as I can see backend KCFI checks are inserted after register allocation and have to use registers that are already dead. And in at least one Arm situation (namely Armv6-M) no such registers are //conveniently// available, so the check would become more expensive.


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