minami

day17/d17p2.swift

@@ -84,8 +84,8 @@ struct Register : Comparable, CustomStringConvertible {
 
 func possibleAs(fromB5 b5Suffix: Int) -> [Register] {
     let choices: [Register] = (0b000...0b111).compactMap { aSuffix in
-        let aShift = aSuffix ^ 1
-        let b4 = aShift ^ 5
+        let aShift = aSuffix ^ 1  // Replace this with first XOR literal
+        let b4 = aShift ^ 5       // Replace this with second XOR literal
         let a = Register(value: (b4^b5Suffix) << aShift, mask: 0b111 << aShift)
         return a.combine(with: Register(value: aSuffix, mask: 0b111))
     }