/*
* 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;
import java.util.Enumeration;
import org.jikesrvm.compilers.opt.driver.CompilerPhase;
import org.jikesrvm.compilers.opt.ir.Move;
import org.jikesrvm.compilers.opt.ir.IR;
import org.jikesrvm.compilers.opt.ir.IRTools;
import org.jikesrvm.compilers.opt.ir.Instruction;
import org.jikesrvm.compilers.opt.ir.Operator;
import static org.jikesrvm.compilers.opt.ir.Operators.SPLIT;
import org.jikesrvm.compilers.opt.ir.Unary;
import org.jikesrvm.compilers.opt.ir.operand.Operand;
import org.jikesrvm.compilers.opt.ir.operand.RegisterOperand;
/**
* Change SPLIT operations inserting for live range splitting into Moves.
*/
public final class MutateSplits extends CompilerPhase {
/**
* Return this instance of this phase. This phase contains no
* per-compilation instance fields.
* @param ir not used
* @return this
*/
@Override
public CompilerPhase newExecution(IR ir) {
return this;
}
@Override
public boolean shouldPerform(OptOptions options) {
return options.SSA_LIVE_RANGE_SPLITTING;
}
@Override
public String getName() {
return "Mutate Splits";
}
/**
* The main entrypoint for this pass.
*/
@Override
public void perform(IR ir) {
for (Enumeration<Instruction> e = ir.forwardInstrEnumerator(); e.hasMoreElements();) {
Instruction s = e.nextElement();
if (s.operator() == SPLIT) {
RegisterOperand lhs = Unary.getResult(s);
Operator mv = IRTools.getMoveOp(lhs.getType());
Operand rhs = Unary.getVal(s);
Move.mutate(s, mv, lhs, rhs);
}
}
}
}