hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64VZeroUpper.java

/*
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.graalvm.compiler.lir.amd64;

import static jdk.vm.ci.code.ValueUtil.asRegister;
import static jdk.vm.ci.code.ValueUtil.isRegister;

import java.util.BitSet;

import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.amd64.AMD64;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.code.RegisterValue;
import jdk.vm.ci.meta.Value;

public class AMD64VZeroUpper extends AMD64LIRInstruction {

    public static final LIRInstructionClass<AMD64VZeroUpper> TYPE = LIRInstructionClass.create(AMD64VZeroUpper.class);

    @Temp protected final RegisterValue[] xmmRegisters;

    public AMD64VZeroUpper(Value[] exclude) {
        super(TYPE);
        xmmRegisters = initRegisterValues(exclude);
    }

    private static RegisterValue[] initRegisterValues(Value[] exclude) {
        BitSet skippedRegs = new BitSet();
        int numSkipped = 0;
        if (exclude != null) {
            for (Value value : exclude) {
                if (isRegister(value) && asRegister(value).getRegisterCategory().equals(AMD64.XMM)) {
                    skippedRegs.set(asRegister(value).number);
                    numSkipped++;
                }
            }
        }
        RegisterValue[] regs = new RegisterValue[AMD64.xmmRegistersAVX512.length - numSkipped];
        for (int i = 0, j = 0; i < AMD64.xmmRegistersAVX512.length; i++) {
            Register reg = AMD64.xmmRegistersAVX512[i];
            if (!skippedRegs.get(reg.number)) {
                regs[j++] = reg.asValue();
            }
        }
        return regs;
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler asm) {
        asm.vzeroupper();
    }
}