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Avoid cloning levels

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This commit is contained in:
Morgan Phillips
2016-07-26 17:13:11 -07:00
parent b67d07e87a
commit 1027fc7472
1 changed files with 4 additions and 5 deletions
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9
cranelift/src/libcretonne/cfg.rs
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@@ -142,7 +142,7 @@ impl ControlFlowGraph {
}
/// A helper for iteratively walking a CFG in postorder.
pub struct CFGPostorderWalker<'a> {
struct CFGPostorderWalker<'a> {
cfg: &'a ControlFlowGraph,
start: Ebb,
// Ebbs are mapped to a tuple of booleans where the first bool
@@ -194,15 +194,14 @@ impl<'a> CFGPostorderWalker<'a> {
self.levels.push(vec![self.start.clone()]);
while self.levels.len() > 0 {
let level = &self.levels[self.levels.len() - 1].clone();
if self.level_index >= level.len() {
let level_len = self.levels[self.levels.len() - 1].len();
if self.level_index >= level_len {
self.levels.pop();
self.level_index = 0;
continue;
}
let node = level[self.level_index].clone();
let node = self.levels[self.levels.len() - 1][self.level_index].clone();
if !self.visited(node) {
if self.children_visited(node) {
self.mark_visited(node);