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Compute loop headers in postorder.
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compiler/rustc_mir_transform/src/jump_threading.rs

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -913,7 +913,7 @@ fn loop_headers(body: &Body<'_>) -> DenseBitSet<BasicBlock> {
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let mut loop_headers = DenseBitSet::new_empty(body.basic_blocks.len());
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let dominators = body.basic_blocks.dominators();
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// Only visit reachable blocks.
916-
for (bb, bbdata) in traversal::preorder(body) {
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for (bb, bbdata) in traversal::postorder(body) {
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for succ in bbdata.terminator().successors() {
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if dominators.dominates(succ, bb) {
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loop_headers.insert(succ);

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