From 8f6e65136c94956fc172f73b31be282b65afb0c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20Rakic?= <remy.rakic+github@gmail.com>
Date: Wed, 14 Jun 2023 19:57:55 +0000
Subject: [PATCH] make reorder BB pass use cached RPO

---
 compiler/rustc_mir_transform/src/prettify.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/rustc_mir_transform/src/prettify.rs b/compiler/rustc_mir_transform/src/prettify.rs
index 6f46974ea00..745fa30841c 100644
--- a/compiler/rustc_mir_transform/src/prettify.rs
+++ b/compiler/rustc_mir_transform/src/prettify.rs
@@ -24,7 +24,7 @@ impl<'tcx> MirPass<'tcx> for ReorderBasicBlocks {
 
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         let rpo: IndexVec<BasicBlock, BasicBlock> =
-            body.basic_blocks.postorder().iter().copied().rev().collect();
+            body.basic_blocks.reverse_postorder().iter().copied().collect();
         if rpo.iter().is_sorted() {
             return;
         }