From 181ba25a45de3663d5e50b1b22a3545f82324b70 Mon Sep 17 00:00:00 2001
From: Etienne Cimon <etcimon@gmail.com>
Date: Mon, 16 Jul 2018 14:21:49 -0400
Subject: [PATCH] Avoid costly misalignment checks during array cast when all
 testing is said and done and performance becomes critical (When no bounds
 checks are asked for)

---
 src/rt/arraycast.d | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/rt/arraycast.d b/src/rt/arraycast.d
index d16d30d5fa..e16918dce5 100644
--- a/src/rt/arraycast.d
+++ b/src/rt/arraycast.d
@@ -25,7 +25,8 @@ void[] _d_arraycast(size_t tsize, size_t fsize, void[] a)
     auto length = a.length;
 
     auto nbytes = length * fsize;
-    if (nbytes % tsize != 0)
+    version (D_NoBoundsChecks) {}
+    else if (nbytes % tsize != 0)
     {
         throw new Error("array cast misalignment");
     }