From 562fb0d14b8ffec8e614d8f53d5ae06bf74692fe Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Wed, 16 Aug 2023 05:31:44 +0800
Subject: [PATCH] fixes #22481; fixes `card` undefined misalignment behavior
 (#22484)

* fixes `card` undefined misalignment behavior

* Update lib/system/sets.nim

---------

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
(cherry picked from commit ade75a148332e670244a719202f7f0337d2e469a)
---
 lib/system/sets.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/system/sets.nim b/lib/system/sets.nim
index 5f7c3e37b8..97431c2964 100644
--- a/lib/system/sets.nim
+++ b/lib/system/sets.nim
@@ -13,9 +13,11 @@
 proc cardSetImpl(s: ptr UncheckedArray[uint8], len: int): int {.inline.} =
   var i = 0
   result = 0
+  var num = 0'u64
   when defined(x86) or defined(amd64):
     while i < len - 8:
-      inc(result, countBits64((cast[ptr uint64](s[i].unsafeAddr))[]))
+      copyMem(addr num, addr s[i], 8)
+      inc(result, countBits64(num))
       inc(i, 8)
 
   while i < len: