[PATCH] D120121: [StableHashing] Hash vregs with multiple defs

[Kyungwoo Lee via Phabricator via llvm-commits]

kyulee added a comment.

Stable hash was designed to infer the machine instructions that are likely to be identical so that we can optimistically outline them.
I don't have a strong suggestion on how to interpret this in the presence of virtual registers (before RA).
But by taking all their defs into account, it appears the hash is likely to be more unique than before.
Is there any specific use case or reason to enhance this collision?


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https://reviews.llvm.org/D120121