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 aShift = aSuffix ^ 1  // Replace this with first XOR literal
-        let b4 = aShift ^ 5
+        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))
     }

day17/minami.swift

@@ -0,0 +1,29 @@
+/*
+2,4, 1,5, 7,5, 1,6, 0,3, 4,1, 5,5, 3,0
+bst 4 // B = A % 8
+bxl 5 // B = B ^ 5
+cdv 5 // C = A >> B
+bxl 6 // B = B ^ 6
+adv 3 // A = A >> 3
+bxc 1 // B = B ^ C
+out 5 // print(B % 8)
+jnz 0 // loop while A != 0
+*/
+
+import Foundation
+
+var A = 44374556
+var B = 0
+var C = 0
+while true {
+    B = A % 8
+    B = B ^ 0b101
+    C = A >> B
+    B = B ^ 0b110
+    A = A >> 3
+    B = B ^ C
+    print(B % 8, terminator: ",")
+    if A == 0 { break }
+}
+print()
+