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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.
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@ -299,7 +299,7 @@ impl<Node: Idx> Dominators<Node> {
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/// of two unrelated nodes will also be consistent, but otherwise the order has no
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/// meaning.) This method cannot be used to determine if either Node dominates the other.
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pub fn rank_partial_cmp(&self, lhs: Node, rhs: Node) -> Option<Ordering> {
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self.post_order_rank[lhs].partial_cmp(&self.post_order_rank[rhs])
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self.post_order_rank[rhs].partial_cmp(&self.post_order_rank[lhs])
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}
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}
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@ -341,11 +341,11 @@ impl<'a, 'tcx> CoverageSpans<'a, 'tcx> {
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if a.is_in_same_bcb(b) {
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Some(Ordering::Equal)
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} else {
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// Sort equal spans by dominator relationship, in reverse order (so
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// dominators always come after the dominated equal spans). When later
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// comparing two spans in order, the first will either dominate the second,
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// or they will have no dominator relationship.
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self.basic_coverage_blocks.dominators().rank_partial_cmp(b.bcb, a.bcb)
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// Sort equal spans by dominator relationship (so dominators always come
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// before the dominated equal spans). When later comparing two spans in
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// order, the first will either dominate the second, or they will have no
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// dominator relationship.
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self.basic_coverage_blocks.dominators().rank_partial_cmp(a.bcb, b.bcb)
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}
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} else {
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// Sort hi() in reverse order so shorter spans are attempted after longer spans.
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