electriclilies commented on pull request #8835:
URL: https://github.com/apache/tvm/pull/8835#issuecomment-905711627
@mbs-octoml I was doing a bit of debugging yesterday and saw that behavior
too-- there are some cases where we try to look up a target that is LLVM CPU in
a map but we don't find it, even though if you print the map there is a target
with the same target string as the target we're looking for.
I discussed a bit with @junrushao1994 and he said that Target's equality /
hashing function is just based on pointer equality because Target equality is
actually not well defined.
So I think that there are a few possibilities for what we can do regarding
the issue with` Map<Target, IRModule>`:
1. Introduce equality and hashing functions for Targets based on string
equality. This would replicate the current behavior at least and allow us to
key into those maps.
The intention would be to remove the hashing and equality functions
eventually -- but I am wary of doing this because once the functions are
introduced, people may start using them and once uses are in the codebase, it
could be difficult to actually remove the hash and equality functions..
2. Introduce a new type that is a Map<Target, IRModule>, and we pass in a
hash function that uses string equality on the Target. This would allow us to
replicate the current behavior (essentially keying by strings in the map) but
wouldn't expose the hash and equality functions.
3. Wait until more of these maps are removed to do this change
My preference would be option 2
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