From be2cd9540b0e56cd798ea1911ae48dc16ae2383f Mon Sep 17 00:00:00 2001
From: Oli Scherer <github333195615777966@oli-obk.de>
Date: Fri, 14 Feb 2025 10:58:40 +0000
Subject: [PATCH] Decode metadata buffer in one go

---
 compiler/rustc_metadata/src/rmeta/encoder.rs | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs
index 81fb918c6040a..d8a7c32a299c2 100644
--- a/compiler/rustc_metadata/src/rmeta/encoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/encoder.rs
@@ -2272,10 +2272,7 @@ impl<D: Decoder> Decodable<D> for EncodedMetadata {
         let len = d.read_usize();
         let mmap = if len > 0 {
             let mut mmap = MmapMut::map_anon(len).unwrap();
-            for _ in 0..len {
-                (&mut mmap[..]).write_all(&[d.read_u8()]).unwrap();
-            }
-            mmap.flush().unwrap();
+            mmap.copy_from_slice(d.read_raw_bytes(len));
             Some(mmap.make_read_only().unwrap())
         } else {
             None