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/*
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* Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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46344
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package org.graalvm.compiler.lir.aarch64;
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import static jdk.vm.ci.aarch64.AArch64.zr;
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import static jdk.vm.ci.code.ValueUtil.asRegister;
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import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
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import org.graalvm.compiler.asm.Label;
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import org.graalvm.compiler.asm.aarch64.AArch64Address;
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import org.graalvm.compiler.asm.aarch64.AArch64Assembler.ConditionFlag;
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import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
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import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler.ScratchRegister;
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import org.graalvm.compiler.core.common.LIRKind;
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import org.graalvm.compiler.lir.LIRInstructionClass;
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import org.graalvm.compiler.lir.Opcode;
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import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
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import org.graalvm.compiler.lir.gen.LIRGeneratorTool;
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import jdk.vm.ci.code.Register;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.Value;
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/**
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* Emits code which compares two arrays of the same length. If the CPU supports any vector
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* instructions specialized code is emitted to leverage these instructions.
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*/
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@Opcode("ARRAY_EQUALS")
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public final class AArch64ArrayEqualsOp extends AArch64LIRInstruction {
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public static final LIRInstructionClass<AArch64ArrayEqualsOp> TYPE = LIRInstructionClass.create(AArch64ArrayEqualsOp.class);
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private final JavaKind kind;
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private final int arrayBaseOffset;
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private final int arrayIndexScale;
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@Def({REG}) protected Value resultValue;
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@Alive({REG}) protected Value array1Value;
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@Alive({REG}) protected Value array2Value;
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@Alive({REG}) protected Value lengthValue;
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@Temp({REG}) protected Value temp1;
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@Temp({REG}) protected Value temp2;
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@Temp({REG}) protected Value temp3;
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@Temp({REG}) protected Value temp4;
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public AArch64ArrayEqualsOp(LIRGeneratorTool tool, JavaKind kind, Value result, Value array1, Value array2, Value length, boolean directPointers) {
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super(TYPE);
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assert !kind.isNumericFloat() : "Float arrays comparison (bitwise_equal || both_NaN) isn't supported";
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this.kind = kind;
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this.arrayBaseOffset = directPointers ? 0 : tool.getProviders().getMetaAccess().getArrayBaseOffset(kind);
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this.arrayIndexScale = tool.getProviders().getMetaAccess().getArrayIndexScale(kind);
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this.resultValue = result;
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this.array1Value = array1;
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this.array2Value = array2;
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this.lengthValue = length;
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// Allocate some temporaries.
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this.temp1 = tool.newVariable(LIRKind.unknownReference(tool.target().arch.getWordKind()));
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this.temp2 = tool.newVariable(LIRKind.unknownReference(tool.target().arch.getWordKind()));
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this.temp3 = tool.newVariable(LIRKind.value(tool.target().arch.getWordKind()));
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this.temp4 = tool.newVariable(LIRKind.value(tool.target().arch.getWordKind()));
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}
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@Override
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public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
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Register result = asRegister(resultValue);
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Register array1 = asRegister(temp1);
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Register array2 = asRegister(temp2);
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Register length = asRegister(temp3);
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Label breakLabel = new Label();
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try (ScratchRegister sc1 = masm.getScratchRegister()) {
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Register rscratch1 = sc1.getRegister();
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// Load array base addresses.
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masm.lea(array1, AArch64Address.createUnscaledImmediateAddress(asRegister(array1Value), arrayBaseOffset));
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masm.lea(array2, AArch64Address.createUnscaledImmediateAddress(asRegister(array2Value), arrayBaseOffset));
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// Get array length in bytes.
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masm.mov(rscratch1, arrayIndexScale);
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masm.smaddl(length, asRegister(lengthValue), rscratch1, zr);
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masm.mov(64, result, length); // copy
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emit8ByteCompare(crb, masm, result, array1, array2, length, breakLabel, rscratch1);
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emitTailCompares(masm, result, array1, array2, breakLabel, rscratch1);
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// Return: rscratch1 is non-zero iff the arrays differ
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masm.bind(breakLabel);
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masm.cmp(64, rscratch1, zr);
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masm.cset(result, ConditionFlag.EQ);
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}
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}
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/**
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* Vector size used in {@link #emit8ByteCompare}.
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*/
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private static final int VECTOR_SIZE = 8;
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/**
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* Emits code that uses 8-byte vector compares.
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*
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*/
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private void emit8ByteCompare(CompilationResultBuilder crb, AArch64MacroAssembler masm, Register result, Register array1, Register array2, Register length, Label breakLabel,
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Register rscratch1) {
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Label loop = new Label();
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Label compareTail = new Label();
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Register temp = asRegister(temp4);
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masm.and(64, result, result, VECTOR_SIZE - 1); // tail count (in bytes)
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masm.ands(64, length, length, ~(VECTOR_SIZE - 1)); // vector count (in bytes)
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masm.branchConditionally(ConditionFlag.EQ, compareTail);
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masm.lea(array1, AArch64Address.createRegisterOffsetAddress(array1, length, false));
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masm.lea(array2, AArch64Address.createRegisterOffsetAddress(array2, length, false));
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masm.sub(64, length, zr, length);
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// Align the main loop
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masm.align(crb.target.wordSize * 2);
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masm.bind(loop);
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masm.ldr(64, temp, AArch64Address.createRegisterOffsetAddress(array1, length, false));
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masm.ldr(64, rscratch1, AArch64Address.createRegisterOffsetAddress(array2, length, false));
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masm.eor(64, rscratch1, temp, rscratch1);
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masm.cbnz(64, rscratch1, breakLabel);
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masm.add(64, length, length, VECTOR_SIZE);
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masm.cbnz(64, length, loop);
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masm.cbz(64, result, breakLabel);
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/*
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* Compare the remaining bytes with an unaligned memory load aligned to the end of the
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* array.
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*/
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masm.lea(array1, AArch64Address.createUnscaledImmediateAddress(array1, -VECTOR_SIZE));
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masm.lea(array2, AArch64Address.createUnscaledImmediateAddress(array2, -VECTOR_SIZE));
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masm.ldr(64, temp, AArch64Address.createRegisterOffsetAddress(array1, result, false));
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masm.ldr(64, rscratch1, AArch64Address.createRegisterOffsetAddress(array2, result, false));
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masm.eor(64, rscratch1, temp, rscratch1);
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masm.jmp(breakLabel);
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masm.bind(compareTail);
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}
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/**
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* Emits code to compare the remaining 1 to 4 bytes.
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*
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*/
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private void emitTailCompares(AArch64MacroAssembler masm, Register result, Register array1, Register array2, Label breakLabel, Register rscratch1) {
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Label compare2Bytes = new Label();
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Label compare1Byte = new Label();
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Label end = new Label();
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Register temp = asRegister(temp4);
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if (kind.getByteCount() <= 4) {
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// Compare trailing 4 bytes, if any.
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masm.ands(32, zr, result, 4);
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masm.branchConditionally(ConditionFlag.EQ, compare2Bytes);
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masm.ldr(32, temp, AArch64Address.createPostIndexedImmediateAddress(array1, 4));
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masm.ldr(32, rscratch1, AArch64Address.createPostIndexedImmediateAddress(array2, 4));
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masm.eor(32, rscratch1, temp, rscratch1);
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masm.cbnz(32, rscratch1, breakLabel);
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if (kind.getByteCount() <= 2) {
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// Compare trailing 2 bytes, if any.
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masm.bind(compare2Bytes);
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masm.ands(32, zr, result, 2);
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masm.branchConditionally(ConditionFlag.EQ, compare1Byte);
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masm.ldr(16, temp, AArch64Address.createPostIndexedImmediateAddress(array1, 2));
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masm.ldr(16, rscratch1, AArch64Address.createPostIndexedImmediateAddress(array2, 2));
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masm.eor(32, rscratch1, temp, rscratch1);
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masm.cbnz(32, rscratch1, breakLabel);
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// The one-byte tail compare is only required for boolean and byte arrays.
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if (kind.getByteCount() <= 1) {
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// Compare trailing byte, if any.
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masm.bind(compare1Byte);
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masm.ands(32, zr, result, 1);
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masm.branchConditionally(ConditionFlag.EQ, end);
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masm.ldr(8, temp, AArch64Address.createBaseRegisterOnlyAddress(array1));
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masm.ldr(8, rscratch1, AArch64Address.createBaseRegisterOnlyAddress(array2));
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masm.eor(32, rscratch1, temp, rscratch1);
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masm.cbnz(32, rscratch1, breakLabel);
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} else {
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masm.bind(compare1Byte);
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}
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} else {
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masm.bind(compare2Bytes);
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}
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}
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masm.bind(end);
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masm.mov(64, rscratch1, zr);
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}
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}
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