Cranelift: Add a PostDominatorTree#13736
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fitzgen merged 2 commits intoJun 26, 2026
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This is the dominator tree of the control-flow graph with its edges reversed. If `a` post-dominates `b`, then that means that every path from `b` to a function exit (return or trap) must go through `a`. This required making our core dominator tree computation generic over a `&impl DomTreeGraph` so that we could reverse edges without actually reifying the reversed control-flow graph. The `PostDominatorTree` will be used as part of eliminating dead stores in future commits.
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This is the dominator tree of the control-flow graph with its edges reversed. If
apost-dominatesb, then that means that every path frombto a function exit (return or trap) must go througha.This required making our core dominator tree computation generic over a
&impl DomTreeGraphso that we could reverse edges without actually reifying the reversed control-flow graph.The
PostDominatorTreewill be used as part of eliminating dead stores in future commits.