/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.compilers.opt.regalloc.ia32;
import org.jikesrvm.compilers.opt.ir.MIR_Move;
import org.jikesrvm.compilers.opt.ir.IR;
import org.jikesrvm.compilers.opt.ir.Instruction;
import org.jikesrvm.compilers.opt.ir.InstructionEnumeration;
import org.jikesrvm.compilers.opt.ir.Operators;
import org.jikesrvm.compilers.opt.ir.Register;
import org.jikesrvm.compilers.opt.ir.operand.Operand;
import org.jikesrvm.compilers.opt.regalloc.GenericRegisterPreferences;
public class RegisterPreferences extends GenericRegisterPreferences implements Operators {
/**
* Set up register preferences based on instructions in an IR.
*/
public void initialize(IR ir) {
for (InstructionEnumeration e = ir.forwardInstrEnumerator(); e.hasMoreElements();) {
Instruction s = e.nextElement();
switch (s.operator.opcode) {
case IA32_MOV_opcode:
// add affinities produced by MOVE instructions
Operand result = MIR_Move.getResult(s);
Operand value = MIR_Move.getValue(s);
if (result.isRegister() && value.isRegister()) {
Register r1 = result.asRegister().getRegister();
Register r2 = value.asRegister().getRegister();
addAffinity(1, r1, r2);
}
break;
default:
break;
}
}
}
}