[llvm-dev] RFC Storing BB order in llvm::Instruction for faster local dominance

[Sanjoy Das via llvm-dev]

On Mon, Oct 15, 2018 at 8:00 AM Sanjoy Das
<sanjoy at playingwithpointers.com> wrote:
> Would it make sense to put a uint64 epoch number in a basic block
> which would be incremented every time there was a change?  You could
> use that to more easily invalidate OBBs I think, and it may be useful
> in other situations too.  We could perhaps generalize this and keep
> *two* epoch numbers, one for insertions and one for deletions, and
> only use the deletion epoch to invalidate OBBs (but then OBBs would
> have to have value handles).

Sorry I meant only use the *insertion epoch* to invalidate OBBs.

-- Sanjoy