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Don't resolve basic block data in Postorder

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The only usage immediately throws out the data, so.
This commit is contained in:
Maybe Waffle 2023-09-28 22:39:53 +00:00
parent 0d8a45813c
commit a7f3c4e608
2 changed files with 6 additions and 7 deletions
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3
compiler/rustc_middle/src/mir/basic_blocks.rs
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@ -66,8 +66,7 @@ pub fn predecessors(&self) -> &Predecessors {
#[inline]
pub fn reverse_postorder(&self) -> &[BasicBlock] {
self.cache.reverse_postorder.get_or_init(|| {
let mut rpo: Vec<_> =
Postorder::new(&self.basic_blocks, START_BLOCK).map(|(bb, _)| bb).collect();
let mut rpo: Vec<_> = Postorder::new(&self.basic_blocks, START_BLOCK).collect();
rpo.reverse();
rpo
})

10
compiler/rustc_middle/src/mir/traversal.rs
View File

@ -188,14 +188,14 @@ fn traverse_successor(&mut self) {
}
}
impl<'a, 'tcx> Iterator for Postorder<'a, 'tcx> {
type Item = (BasicBlock, &'a BasicBlockData<'tcx>);
impl<'tcx> Iterator for Postorder<'_, 'tcx> {
type Item = BasicBlock;
fn next(&mut self) -> Option<(BasicBlock, &'a BasicBlockData<'tcx>)> {
fn next(&mut self) -> Option<BasicBlock> {
let (bb, _) = self.visit_stack.pop()?;
self.traverse_successor();
Some((bb, &self.basic_blocks[bb]))
Some(bb)
}
fn size_hint(&self) -> (usize, Option<usize>) {