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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.
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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).
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package jdk.graal.compiler.lir.amd64;

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

import jdk.graal.compiler.asm.amd64.AMD64Assembler.VexRVMIOp;
import jdk.graal.compiler.asm.amd64.AMD64MacroAssembler;
import jdk.graal.compiler.asm.amd64.AVXKind.AVXSize;
import jdk.graal.compiler.core.common.LIRKind;
import jdk.graal.compiler.debug.GraalError;
import jdk.graal.compiler.lir.LIRInstructionClass;
import jdk.graal.compiler.lir.asm.CompilationResultBuilder;
import jdk.graal.compiler.lir.gen.LIRGeneratorTool;

import jdk.vm.ci.amd64.AMD64Kind;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.AllocatableValue;
import jdk.vm.ci.meta.PlatformKind;
import jdk.vm.ci.meta.Value;

public class AMD64MathCopySignOp extends AMD64LIRInstruction {
    public static final LIRInstructionClass TYPE = LIRInstructionClass.create(AMD64MathCopySignOp.class);

    @Def({OperandFlag.REG, OperandFlag.HINT}) protected Value result;

    @Use({OperandFlag.REG}) protected Value magnitude;
    @Alive({OperandFlag.REG}) protected Value sign;

    @Temp({OperandFlag.REG}) protected Value scratchGP;
    @Temp({OperandFlag.REG}) protected Value scratchXMM;

    public AMD64MathCopySignOp(LIRGeneratorTool tool, Value result, AllocatableValue magnitude, AllocatableValue sign) {
        super(TYPE);
        this.result = result;
        this.magnitude = magnitude;
        this.sign = sign;
        this.scratchGP = tool.newVariable(LIRKind.value(tool.target().arch.getWordKind()));
        this.scratchXMM = tool.newVariable(LIRKind.value(sign.getPlatformKind()));
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
        PlatformKind kind = result.getPlatformKind();

        Register resultReg = asRegister(result);
        Register signReg = asRegister(sign);

        Register scratchGPReg = asRegister(scratchGP);
        Register scratchXMMReg = asRegister(scratchXMM);

        AMD64Move.move(crb, masm, result, magnitude);

        if (kind == AMD64Kind.SINGLE) {
            masm.movl(scratchGPReg, 0x7FFFFFFF);
            masm.movdl(scratchXMMReg, scratchGPReg);
            VexRVMIOp.VPTERNLOGD.emit(masm, AVXSize.XMM, resultReg, signReg, scratchXMMReg, 0xE4);
        } else if (kind == AMD64Kind.DOUBLE) {
            masm.movq(scratchGPReg, 0x7FFFFFFFFFFFFFFFL);
            masm.movdq(scratchXMMReg, scratchGPReg);
            VexRVMIOp.VPTERNLOGQ.emit(masm, AVXSize.XMM, resultReg, signReg, scratchXMMReg, 0xE4);
        } else {
            throw GraalError.shouldNotReachHere("unsupported kind for Math.copySign"); // ExcludeFromJacocoGeneratedReport
        }
    }
}