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Fix Dominators::rank_partial_cmp to match documentation 

The only use site is also updated accordingly and there is no change in
end-to-end behaviour.
This commit is contained in:
Tomasz Miąsko 2023-01-18 00:00:00 +00:00
parent 1f72129ffe
commit b8c5821ad8
2 changed files with 6 additions and 6 deletions
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2
compiler/rustc_data_structures/src/graph/dominators/mod.rs
View File

@ -299,7 +299,7 @@ impl<Node: Idx> Dominators<Node> {
/// of two unrelated nodes will also be consistent, but otherwise the order has no
/// meaning.) This method cannot be used to determine if either Node dominates the other.
pub fn rank_partial_cmp(&self, lhs: Node, rhs: Node) -> Option<Ordering> {
self.post_order_rank[lhs].partial_cmp(&self.post_order_rank[rhs])
self.post_order_rank[rhs].partial_cmp(&self.post_order_rank[lhs])
}
}

10
compiler/rustc_mir_transform/src/coverage/spans.rs
View File

@ -341,11 +341,11 @@ impl<'a, 'tcx> CoverageSpans<'a, 'tcx> {
if a.is_in_same_bcb(b) {
Some(Ordering::Equal)
} else {
// Sort equal spans by dominator relationship, in reverse order (so
// dominators always come after the dominated equal spans). When later
// comparing two spans in order, the first will either dominate the second,
// or they will have no dominator relationship.
self.basic_coverage_blocks.dominators().rank_partial_cmp(b.bcb, a.bcb)
// Sort equal spans by dominator relationship (so dominators always come
// before the dominated equal spans). When later comparing two spans in
// order, the first will either dominate the second, or they will have no
// dominator relationship.
self.basic_coverage_blocks.dominators().rank_partial_cmp(a.bcb, b.bcb)
}
} else {
// Sort hi() in reverse order so shorter spans are attempted after longer spans.