feat: unit 04 writing .asm

project-4-machine-language/asm/mult.asm

@@ -0,0 +1,51 @@
+// mult.asm
+//
+// Create a program that multiplies R0 & R1 and puts the result in R2
+// Algorithm is based on repetetive action.
+//
+//
+
+// okay let's go.
+
+// Get R0
+// Create a loop based on the number of R0. I.e loop 10 times if R0 is 10.
+// Everytime around sum of R2 should be incremented by R1
+// Need variable @i which is the index. If that reaches 0. Loop end
+
+    // Variables
+    @i
+    M=1
+    @R2
+    M=0
+    // Check if loop is needed.
+    @R0
+    D=M
+    @END // Jump to End if R0 is 0. Nothing to add.
+    D;JEQ
+    @R1
+    D=M
+    @END // Jump to End if R1 is 0. Nothing to add.
+    D;JEQ
+
+(LOOP)
+    // get R1
+    @R1
+    D=M
+    // Add R1 to R2
+    @R2
+    M=D+M
+    // add one to i
+    @i
+    M=M+1
+    D=M
+    @R0
+    D=D-M
+    // check if R0 - i is greater or equal than 0
+    @LOOP
+    D;JLE
+    // Then jump to loop
+    // else just move on
+
+(END) // End of Program
+    @END
+    0;JMP