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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

 * 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.

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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.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();

    }

}