1 files changed, 8 insertions, 5 deletions
diff --git a/compiler/rustc_middle/src/mir/basic_blocks.rs b/compiler/rustc_middle/src/mir/basic_blocks.rs
index 9d70dbfa0..7722e7b47 100644
--- a/compiler/rustc_middle/src/mir/basic_blocks.rs
+++ b/compiler/rustc_middle/src/mir/basic_blocks.rs
@@ -26,7 +26,7 @@ struct Cache {
     predecessors: OnceCell<Predecessors>,
     switch_sources: OnceCell<SwitchSources>,
     is_cyclic: OnceCell<bool>,
-    postorder: OnceCell<Vec<BasicBlock>>,
+    reverse_postorder: OnceCell<Vec<BasicBlock>>,
     dominators: OnceCell<Dominators<BasicBlock>>,
 }
 
@@ -62,11 +62,14 @@ impl<'tcx> BasicBlocks<'tcx> {
         })
     }
 
-    /// Returns basic blocks in a postorder.
+    /// Returns basic blocks in a reverse postorder.
     #[inline]
-    pub fn postorder(&self) -> &[BasicBlock] {
-        self.cache.postorder.get_or_init(|| {
-            Postorder::new(&self.basic_blocks, START_BLOCK).map(|(bb, _)| bb).collect()
+    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();
+            rpo.reverse();
+            rpo
         })
     }