fixes #22481; fixes card undefined misalignment behavior (#22484)

* fixes `card` undefined misalignment behavior * Update lib/system/sets.nim --------- Co-authored-by: Andreas Rumpf <[email protected]>
nim-lang · Aug 15, 2023 · ade75a1 · ade75a1
1 parent 6c4e783
commit ade75a1
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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: