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Only visit reachable nodes in SsaLocals.

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This commit is contained in:
Camille GILLOT 2023-05-28 12:55:36 +00:00
parent 255ca18454
commit 3816c15b88
1 changed files with 4 additions and 8 deletions
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12
compiler/rustc_mir_transform/src/ssa.rs
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@ -78,14 +78,10 @@ pub fn new<'tcx>(body: &Body<'tcx>) -> SsaLocals {
visitor.assignments[local] = Set1::One(LocationExtended::Arg);
}
if body.basic_blocks.len() > 2 {
for (bb, data) in traversal::reverse_postorder(body) {
visitor.visit_basic_block_data(bb, data);
}
} else {
for (bb, data) in body.basic_blocks.iter_enumerated() {
visitor.visit_basic_block_data(bb, data);
}
// For SSA assignments, a RPO visit will see the assignment before it sees any use.
// We only visit reachable nodes: computing `dominates` on an unreachable node ICEs.
for (bb, data) in traversal::reverse_postorder(body) {
visitor.visit_basic_block_data(bb, data);
}
for var_debug_info in &body.var_debug_info {