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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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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.ArrayList;
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.RegisterConfig;
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, RegisterConfig registerConfig) {
        super(TYPE);
        xmmRegisters = initRegisterValues(exclude, registerConfig);
    }

    private static RegisterValue[] initRegisterValues(Value[] exclude, RegisterConfig registerConfig) {
        BitSet skippedRegs = new BitSet();
        if (exclude != null) {
            for (Value value : exclude) {
                if (isRegister(value) && asRegister(value).getRegisterCategory().equals(AMD64.XMM)) {
                    skippedRegs.set(asRegister(value).number);
                }
            }
        }
        ArrayList<RegisterValue> regs = new ArrayList<>();
        for (Register r : registerConfig.getCallerSaveRegisters()) {
            if (r.getRegisterCategory().equals(AMD64.XMM) && !skippedRegs.get(r.number)) {
                regs.add(r.asValue());
            }
        }
        return regs.toArray(new RegisterValue[regs.size()]);
    }

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