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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: tools/builtIn/ALU.hdl
-
-/**
- * The ALU. Computes one of the following functions:
- * x+y, x-y, y–x, 0, 1, -1, x, y, -x, -y, !x, !y,
- * x+1, y+1, x-1, y-1, x&y, x|y on two 16-bit inputs.
- * Which function to compute is determined by 6 input bits 
- * denoted zx, nx, zy, ny, f, no.
- * The computed function's value is called "out".
- * In addition to computing out, the ALU computes two 
- * 1-bit outputs called zr and ng:
- * if out == 0, zr = 1; otherwise zr = 0;
- * If out < 0, ng = 1; otherwise ng = 0.
- * The 6-bit combinations (zx,nx,zy,ny,f,no) and 
- * their effect are documented in the book. 
- */
-
-// Implementation: the ALU manipulates the x and y
-// inputs and then operates on the resulting values, 
-// as follows:
-// if (zx  == 1) sets x = 0        // 16-bit constant
-// if (nx  == 1) sets x = ~x       // bitwise "not"
-// if (zy  == 1) sets y = 0        // 16-bit constant
-// if (ny  == 1) sets y = ~y       // bitwise "not"
-// if (f   == 1) sets out = x + y  // integer 2's-complement addition
-// if (f   == 0) sets out = x & y  // bitwise And
-// if (no  == 1) sets out = ~out   // bitwise Not
-// if (out == 0) sets zr = 1
-// if (out < 0)  sets ng = 1
-
-
-CHIP ALU {
-
-    IN  // 16-bit inputs:
-        x[16], y[16],
-        // Control bits:
-        zx, // Zero the x input
-        nx, // Negate the x input
-        zy, // Zero the y input
-        ny, // Negate the y input
-        f,  // Function code: 1 for add, 0 for and
-        no; // Negate the out output
-
-    OUT // 16-bit output
-        out[16],
-
-        // ALU output flags
-        zr, // 1 if out=0, 0 otherwise
-        ng; // 1 if out<0, 0 otherwise
-
-    BUILTIN ALU;
-}