1 files changed, 53 insertions, 0 deletions
diff --git a/projects/04/mult/Mult.asm b/projects/04/mult/Mult.asm
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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/04/Mult.asm
+
+// Multiplies R0 and R1 and stores the result in R2.
+// (R0, R1, R2 refer to RAM[0], RAM[1], and RAM[2], respectively.)
+//
+// This program only needs to handle arguments that satisfy
+// R0 >= 0, R1 >= 0, and R0*R1 < 32768.
+
+// Put your code here.
+@acc
+M=0	// acc = 0
+
+@R0
+D=M
+@a
+M=D	// a = RAM[0]
+@WRITE
+D;JEQ	// if (a == 0) goto WRITE
+
+@R1
+D=M
+@b
+M=D	// b = RAM[1]
+@WRITE
+D;JEQ	// if (b == 0) goto WRITE
+
+(LOOP)
+	@b
+	D=M
+	@acc
+	M=M+D	// acc += b
+	@a
+	M=M-1	// a--
+	D=M
+	@WRITE
+	D;JEQ	// if (a == 0) goto WRITE
+	@LOOP
+	0;JMP	// goto LOOP
+
+(WRITE)
+	@acc
+	D=M
+	@R2
+	M=D	// RAM[2] = acc
+	@END
+	0;JMP	// goto END
+
+(END)
+	@END
+	0;JMP