From 9c6d6dc9aa1ebc55338e2a834034c6e63e48661c Mon Sep 17 00:00:00 2001
From: Johan Milanov <johanmi@protonmail.com>
Date: Mon, 3 Apr 2023 22:49:36 +0200
Subject: [PATCH] Slightly more efficient vec initialization (#120)

This will, at least on x86_64, compile down to simpler, shorter assembly that uses a zeroed allocation instead of a regular allocation, a memset and various `raw_vec` methods.
---
 src/postorder.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/postorder.rs b/src/postorder.rs
index 3e04eb0..020e4ea 100644
--- a/src/postorder.rs
+++ b/src/postorder.rs
@@ -18,8 +18,7 @@ pub fn calculate<'a, SuccFn: Fn(Block) -> &'a [Block]>(
     let mut ret = vec![];
 
     // State: visited-block map, and explicit DFS stack.
-    let mut visited = vec![];
-    visited.resize(num_blocks, false);
+    let mut visited = vec![false; num_blocks];
 
     struct State<'a> {
         block: Block,