1 pnkfelix 1.1.2.1 // InstrMOVE.java, created Mon Aug 2 23:19:01 1999 by pnkfelix
2 pnkfelix 1.1.2.1 // Copyright (C) 1999 Felix S. Klock II <pnkfelix@mit.edu>
3 pnkfelix 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 pnkfelix 1.1.2.1 package harpoon.IR.Assem;
5 pnkfelix 1.1.2.1
6 pnkfelix 1.1.2.1 import harpoon.ClassFile.HCodeElement;
7 pnkfelix 1.1.2.1 import harpoon.Temp.Temp;
8 cananian 1.1.2.3 import harpoon.Temp.TempMap;
9 pnkfelix 1.1.2.1
10 pnkfelix 1.1.2.4 import harpoon.Util.Util;
11 pnkfelix 1.1.2.4
12 pnkfelix 1.1.2.1 /**
13 pnkfelix 1.1.2.1 * <code>InstrMOVE</code> represents a copying of a set of source
14 pnkfelix 1.1.2.1 * <code>Temp</code>s to a set of destination <code>Temp</code>s.
15 pnkfelix 1.1.2.1 * This instruction is being specialized to allow for easier detection
16 pnkfelix 1.1.2.1 * of MOVEs which could guide optimizations (either in eliminating the
17 pnkfelix 1.1.2.1 * MOVE in question or in choosing which register a given
18 pnkfelix 1.1.2.1 * <code>Temp</code> would be best assigned to.
19 pnkfelix 1.1.2.1 *
20 pnkfelix 1.1.2.1 * Note that <code>InstrMOVE</code>s at the lowest level represents
21 pnkfelix 1.1.2.1 * the movement of data from register to register, <B>not</B> to
22 pnkfelix 1.1.2.1 * memory (use <code>InstrMEM</code> for that). However, prior to
23 pnkfelix 1.1.2.1 * register allocation it is legal for <code>InstrMOVE</code>s to have
24 pnkfelix 1.1.2.1 * non-register <code>Temp</code>s as their source or destination; the
25 pnkfelix 1.1.2.1 * instruction will simply be replaced later in the compilation with
26 pnkfelix 1.1.2.1 * either a new backend legal <code>InstrMOVE</code> or
27 pnkfelix 1.1.2.1 * <code>InstrMEM</code>.
28 pnkfelix 1.1.2.1 *
29 pnkfelix 1.1.2.1 * @author Felix S. Klock II <pnkfelix@mit.edu>
30 cananian 1.4 * @version $Id: InstrMOVE.java,v 1.4 2002/04/10 03:04:29 cananian Exp $
31 pnkfelix 1.1.2.1 */
32 pnkfelix 1.1.2.1 public class InstrMOVE extends Instr {
33 pnkfelix 1.1.2.1
34 pnkfelix 1.1.2.1 /** Creates a <code>InstrMOVE</code>. */
35 pnkfelix 1.1.2.1 public InstrMOVE(InstrFactory inf, HCodeElement codeSrc,
36 pnkfelix 1.1.2.1 String assem, Temp[] dst, Temp[] tempSrc) {
37 pnkfelix 1.1.2.1 super(inf, codeSrc, assem, dst, tempSrc);
38 cananian 1.3.2.1 assert dst.length == 1 : "can only have one dest";
39 cananian 1.3.2.1 assert tempSrc.length == 1 : "can only have one src";
40 pnkfelix 1.1.2.1 }
41 pnkfelix 1.1.2.1
42 pnkfelix 1.1.2.1 /** Accept a visitor */
43 pnkfelix 1.1.2.2 public void accept(InstrVisitor v) { v.visit(this); }
44 cananian 1.1.2.3
45 cananian 1.1.2.3 public Instr rename(InstrFactory inf, TempMap defMap, TempMap useMap) {
46 cananian 1.1.2.3 return new InstrMOVE(inf, this, getAssem(),
47 cananian 1.1.2.3 map(defMap,def()), map(useMap,use()));
48 pnkfelix 1.1.2.6 }
49 pnkfelix 1.1.2.6
50 pnkfelix 1.1.2.6 public Instr cloneMutateAssem(InstrFactory inf, String newAssem) {
51 pnkfelix 1.1.2.6 return new InstrMOVE(inf, this, newAssem, def(), use());
52 cananian 1.1.2.3 }
53 pnkfelix 1.1.2.5
54 pnkfelix 1.1.2.5 public boolean isMove() { return true; }
55 cananian 1.2 }