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Fix handling of virtual exit node in PostDomTree #53739

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Mar 19, 2024
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Fix handling of virtual exit node in PostDomTree #53739

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5 changes: 1 addition & 4 deletions base/compiler/ssair/domtree.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -345,10 +345,7 @@ function SNCA!(domtree::GenericDomTree{IsPostDom}, blocks::Vector{BasicBlock}, m
ancestors = copy(D.to_parent_pre)
relevant_blocks = IsPostDom ? (1:max_pre) : (2:max_pre)
for w::PreNumber in reverse(relevant_blocks)
# LLVM initializes this to the parent, the paper initializes this to
# `w`, but it doesn't really matter (the parent is a predecessor, so at
# worst we'll discover it below). Save a memory reference here.
semi_w = typemax(PreNumber)
semi_w = ancestors[w]
last_linked = PreNumber(w + 1)
for v ∈ dom_edges(domtree, blocks, D.from_pre[w])
# For the purpose of the domtree, ignore virtual predecessors into
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