From 4210ccad140790df7b4fa0438637d39cad3701b9 Mon Sep 17 00:00:00 2001
From: Artyom Pavlov <newpavlov@gmail.com>
Date: Sat, 13 Oct 2018 22:01:59 +0000
Subject: [PATCH] Use read_unaligned instead of read in transmute_copy

Closes: #55044

This change could result in performance regression on non-x86 platforms. Alternative would be to update `transmute_copy` with alignment requirements.
---
 src/libcore/mem.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
index 27ee9556bd0..06febf33c61 100644
--- a/src/libcore/mem.rs
+++ b/src/libcore/mem.rs
@@ -818,7 +818,7 @@ pub fn drop<T>(_x: T) { }
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
-    ptr::read(src as *const T as *const U)
+    ptr::read_unaligned(src as *const T as *const U)
 }
 
 /// Opaque type representing the discriminant of an enum.