Merge pull request #20 from lorentey/watchOS-warning-fix

DoubleWord._readersBitWidth: Switch to using Int.bitWidth
apple · Jan 27, 2021 · 3e95ba3 · 3e95ba3
2 parents df9f811 + 09ddcdd
commit 3e95ba3
Showing 1 changed file with 3 additions and 5 deletions.
diff --git a/Sources/Atomics/AtomicStrongReference.swift b/Sources/Atomics/AtomicStrongReference.swift
@@ -79,11 +79,9 @@ extension DoubleWord {
 
   @inline(__always)
   fileprivate static var _readersBitWidth: Int {
-    #if arch(i386) || arch(arm) || arch(arm64_32)
-    return 8
-    #else
-    return 16
-    #endif
+    // This reserves 8 bits for the accesses-in-flight counter on 32-bit
+    // systems, and 16 bits on 64-bit systems.
+    Int.bitWidth / 4
   }
 
   @inline(__always)