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The GraalVM compiler and the Graal-truffle optimizer.
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 * 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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).
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package org.graalvm.compiler.lir.amd64;

import static jdk.vm.ci.code.ValueUtil.asRegister;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;

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

import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.Value;

// @formatter:off
@SyncPort(from = "https://github.com/openjdk/jdk/blob/83d92672d4c2637fc37ddd873533c85a9b083904/src/hotspot/cpu/x86/macroAssembler_x86.hpp#L199-L205",
          sha1 = "f1f7051b93fb7037a3f7baf2cfc25681979ac6dc")
// @formatter:on
public final class AMD64FloatToHalfFloatOp extends AMD64LIRInstruction {
    public static final LIRInstructionClass TYPE = LIRInstructionClass.create(AMD64FloatToHalfFloatOp.class);

    @Def({REG}) protected Value dstValue;
    @Alive({REG}) protected Value srcValue;

    @Temp({REG}) protected Value tmpValue;

    public AMD64FloatToHalfFloatOp(LIRGeneratorTool tool, Value dstValue, Value srcValue) {
        super(TYPE);
        this.dstValue = dstValue;
        this.srcValue = srcValue;

        this.tmpValue = tool.newVariable(srcValue.getValueKind());
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
        Register dst = asRegister(dstValue);
        Register src = asRegister(srcValue);
        Register tmp = asRegister(tmpValue);

        masm.vcvtps2ph(tmp, src, 0b100);
        masm.movdl(dst, tmp);
        masm.movswl(dst, dst);
    }
}