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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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package jdk.graal.compiler.lir.aarch64;

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

import jdk.graal.compiler.asm.aarch64.AArch64MacroAssembler;
import jdk.graal.compiler.lir.LIRInstruction;
import jdk.graal.compiler.lir.LIRInstructionClass;
import jdk.graal.compiler.lir.SyncPort;
import jdk.graal.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.aarch64.AArch64Kind;
import jdk.vm.ci.meta.AllocatableValue;

// @formatter:off
@SyncPort(from = "https://github.com/openjdk/jdk/blob/12a61bce8db5e6b152eb101de1662847bebb7997/src/hotspot/cpu/aarch64/aarch64.ad#L13451-L13475",
          sha1 = "5e7655c00a9d610fa3c992305c0f6aeba32b2d6c")
// @formatter:on
public class AArch64BitSwapOp extends AArch64LIRInstruction {

    public static final LIRInstructionClass TYPE = LIRInstructionClass.create(AArch64BitSwapOp.class);

    @LIRInstruction.Def({LIRInstruction.OperandFlag.REG}) protected AllocatableValue result;
    @LIRInstruction.Use({LIRInstruction.OperandFlag.REG}) protected AllocatableValue input;

    public AArch64BitSwapOp(AllocatableValue result, AllocatableValue input) {
        super(TYPE);
        AArch64Kind kind = (AArch64Kind) input.getPlatformKind();
        assert kind == AArch64Kind.DWORD || kind == AArch64Kind.QWORD : kind;

        this.result = result;
        this.input = input;
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
        int size = input.getPlatformKind().getSizeInBytes() * Byte.SIZE;
        masm.rbit(size, asRegister(result), asRegister(input));
    }
}