Wasmtime GitHub notifications bot (Apr 25 2024 at 13:49): Wasmtime GitHub notifications bot (Apr 25 2024 at 13:49):KGrewal1 opened PR #8474 from KGrewal1:div-opts to bytecodealliance:main:
An attempt at adding isle opts for turning division by powers of two into ushr or sshr bit shifts
Wasmtime GitHub notifications bot (Apr 25 2024 at 13:49):KGrewal1 requested elliottt for a review on PR #8474.
Wasmtime GitHub notifications bot (Apr 25 2024 at 13:49):KGrewal1 requested wasmtime-compiler-reviewers for a review on PR #8474.
Wasmtime GitHub notifications bot (Apr 25 2024 at 16:44):github-actions[bot] commented on PR #8474:
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Wasmtime GitHub notifications bot (Apr 25 2024 at 16:50):fitzgen commented on PR #8474:
I don't think this is viable yet because the e-graph cannot rewrite side effecting instructions in general, see https://github.com/bytecodealliance/wasmtime/issues/5908 for more information.
I suspect that if you attempted to write a filetest exercising this rule, you'd find that it never fires because we never put division instructions into the egraph, and leave them in the "skeleton" outside of the graph.
Wasmtime GitHub notifications bot (Apr 25 2024 at 18:51):KGrewal1 commented on PR #8474:
Ah ok: looking through that issue seems like the current div simplifications in that file also currently do nothing for the same reason...
Wasmtime GitHub notifications bot (May 02 2024 at 20:43):elliottt closed without merge PR #8474.
Wasmtime GitHub notifications bot (May 02 2024 at 20:43):elliottt commented on PR #8474:
@KGrewal1 I'm going to close this PR for now, as it's not possible to implement these rules with the constraints of our current e-graph implementation. We can re-open this PR if that changes in the future.
Last updated: Oct 23 2024 at 20:03 UTC