M projects/04/mult/Mult.asm → projects/04/mult/Mult.asm

@@ -9,4 +9,46 @@ //
 // This program only needs to handle arguments that satisfy
 // R0 >= 0, R1 >= 0, and R0*R1 < 32768.
 
-// Put your code here.+// Put your code here.
+
+// Repeated addition, use R3 as temp
+// R2 = 0
+// for (R3 = R0; R3 > 0; --R3)
+//     R2 += R1
+
+    // R2 = 0
+    @R2
+    M=0
+
+    // R3 = R0
+    @R0
+    D=M
+    @R3
+    M=D
+
+(ADD_LOOP)
+    // D=R3, if D == 0, goto END
+    @R3
+    D=M
+    @END
+    D;JEQ
+
+    // D = R1
+    @R1
+    D=M
+
+    // R2 += D
+    @R2
+    M=D+M
+
+    // --R3
+    @R3
+    M=M-1
+
+    @ADD_LOOP
+    0;JMP
+
+(END)
+    @END
+    0;JMP
+