Minor advanced(by:) enhancement.

oscbyspro · oscbyspro · commit d7b3d3e319d9 · 2024-02-03T15:18:02.000+01:00
diff --git a/stdlib/public/core/Integers.swift b/stdlib/public/core/Integers.swift
@@ -1630,8 +1630,8 @@ extension BinaryInteger {
         : self + Self(truncatingIfNeeded: n)
     } else {
       return n < (0 as Int)
-        ? self - Self(n.magnitude)
-        : self + Self(n.magnitude)
+        ? self - Self(UInt(bitPattern: ~n &+ 1))
+        : self + Self(UInt(bitPattern: n))
     }
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -1630,8 +1630,8 @@ extension BinaryInteger {`
`1630`	`1630`	`: self + Self(truncatingIfNeeded: n)`
`1631`	`1631`	`} else {`
`1632`	`1632`	`return n < (0 as Int)`
`1633`		`- ? self - Self(n.magnitude)`
`1634`		`- : self + Self(n.magnitude)`
	`1633`	`+ ? self - Self(UInt(bitPattern: ~n &+ 1))`
	`1634`	`+ : self + Self(UInt(bitPattern: n))`
`1635`	`1635`	`}`
`1636`	`1636`	`}`
`1637`	`1637`	`}`