Mercurial > hg > truffle
view graal/com.oracle.graal.lir.sparc/src/com/oracle/graal/lir/sparc/SPARCArrayEqualsOp.java @ 18927:8da21b779982
Initialize FrameState with less copying.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Thu, 22 Jan 2015 21:53:06 +0100 |
parents | 44a96c7413a7 |
children | 8fc336a04d77 413ac504d74e |
line wrap: on
line source
/* * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. * 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. * * 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. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.lir.sparc; import static com.oracle.graal.api.code.ValueUtil.*; import static com.oracle.graal.compiler.common.UnsafeAccess.*; import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*; import static com.oracle.graal.sparc.SPARC.*; import static com.oracle.graal.asm.sparc.SPARCAssembler.*; import static com.oracle.graal.asm.sparc.SPARCAssembler.CC.*; import java.lang.reflect.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.asm.*; import com.oracle.graal.asm.sparc.*; import com.oracle.graal.asm.sparc.SPARCMacroAssembler.Cmp; import com.oracle.graal.asm.sparc.SPARCMacroAssembler.Mov; import com.oracle.graal.asm.sparc.SPARCMacroAssembler.Nop; import com.oracle.graal.lir.*; import com.oracle.graal.lir.asm.*; import com.oracle.graal.lir.gen.*; /** * Emits code which compares two arrays of the same length. */ @Opcode("ARRAY_EQUALS") public class SPARCArrayEqualsOp extends SPARCLIRInstruction { private final Kind kind; private final int arrayBaseOffset; private final int arrayIndexScale; @Def({REG}) protected Value resultValue; @Alive({REG}) protected Value array1Value; @Alive({REG}) protected Value array2Value; @Alive({REG}) protected Value lengthValue; @Temp({REG}) protected Value temp1; @Temp({REG}) protected Value temp2; @Temp({REG}) protected Value temp3; @Temp({REG}) protected Value temp4; @Temp({REG}) protected Value temp5; public SPARCArrayEqualsOp(LIRGeneratorTool tool, Kind kind, Value result, Value array1, Value array2, Value length) { this.kind = kind; Class<?> arrayClass = Array.newInstance(kind.toJavaClass(), 0).getClass(); this.arrayBaseOffset = unsafe.arrayBaseOffset(arrayClass); this.arrayIndexScale = unsafe.arrayIndexScale(arrayClass); this.resultValue = result; this.array1Value = array1; this.array2Value = array2; this.lengthValue = length; // Allocate some temporaries. this.temp1 = tool.newVariable(LIRKind.derivedReference(tool.target().wordKind)); this.temp2 = tool.newVariable(LIRKind.derivedReference(tool.target().wordKind)); this.temp3 = tool.newVariable(LIRKind.value(tool.target().wordKind)); this.temp4 = tool.newVariable(LIRKind.value(tool.target().wordKind)); this.temp5 = tool.newVariable(LIRKind.value(tool.target().wordKind)); } @Override public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) { Register result = asRegister(resultValue); Register array1 = asRegister(temp1); Register array2 = asRegister(temp2); Register length = asRegister(temp3); Label trueLabel = new Label(); Label falseLabel = new Label(); Label done = new Label(); // Load array base addresses. new Add(asObjectReg(array1Value), arrayBaseOffset, array1).emit(masm); new Add(asObjectReg(array2Value), arrayBaseOffset, array2).emit(masm); // Get array length in bytes. new Mulx(asIntReg(lengthValue), arrayIndexScale, length).emit(masm); new Mov(length, result).emit(masm); // copy emit8ByteCompare(masm, result, array1, array2, length, trueLabel, falseLabel); emitTailCompares(masm, result, array1, array2, trueLabel, falseLabel); // Return true masm.bind(trueLabel); new Mov(1, result).emit(masm); new Bpa(done).emit(masm); new Nop().emit(masm); // Return false masm.bind(falseLabel); new Mov(g0, result).emit(masm); // That's it masm.bind(done); } /** * Vector size used in {@link #emit8ByteCompare}. */ private static final int VECTOR_SIZE = 8; /** * Emits code that uses 8-byte vector compares. */ private void emit8ByteCompare(SPARCMacroAssembler masm, Register result, Register array1, Register array2, Register length, Label trueLabel, Label falseLabel) { Label loop = new Label(); Label compareTail = new Label(); Label compareTailCorrectVectorEnd = new Label(); Register tempReg1 = asRegister(temp4); Register tempReg2 = asRegister(temp5); boolean hasCBcond = masm.hasFeature(CPUFeature.CBCOND); new And(result, VECTOR_SIZE - 1, result).emit(masm); // tail count (in bytes) new Andcc(length, ~(VECTOR_SIZE - 1), length).emit(masm); // vector count (in bytes) new Bpe(CC.Xcc, compareTail).emit(masm); new Sub(length, VECTOR_SIZE, length).emit(masm); // Delay slot new Add(array1, length, array1).emit(masm); new Add(array2, length, array2).emit(masm); new Sub(g0, length, length).emit(masm); // Compare the last element first new Ldx(new SPARCAddress(array1, 0), tempReg1).emit(masm); new Ldx(new SPARCAddress(array2, 0), tempReg2).emit(masm); if (hasCBcond) { new CBcondx(ConditionFlag.NotEqual, tempReg1, tempReg2, falseLabel).emit(masm); new Nop().emit(masm); // for optimal performance (see manual) new CBcondx(ConditionFlag.Equal, length, 0, compareTailCorrectVectorEnd).emit(masm); new Nop().emit(masm); // for optimal performance (see manual) } else { new Cmp(tempReg1, tempReg2).emit(masm); new Bpne(Xcc, true, false, falseLabel).emit(masm); new Nop().emit(masm); new Bpr(RCondition.Rc_z, false, false, length, compareTailCorrectVectorEnd).emit(masm); new Nop().emit(masm); } // Load the first value from array 1 (Later done in back branch delay-slot) new Ldx(new SPARCAddress(array1, length), tempReg1).emit(masm); masm.bind(loop); new Ldx(new SPARCAddress(array2, length), tempReg2).emit(masm); new Cmp(tempReg1, tempReg2).emit(masm); new Bpne(Xcc, false, false, falseLabel).emit(masm); // Delay slot, not annul, add for next iteration new Addcc(length, VECTOR_SIZE, length).emit(masm); new Bpne(Xcc, true, true, loop).emit(masm); // Annul, to prevent access past the array new Ldx(new SPARCAddress(array1, length), tempReg1).emit(masm); // Load in delay slot // Tail count zero, therefore we can go to the end if (hasCBcond) { new CBcondx(ConditionFlag.Equal, result, 0, trueLabel).emit(masm); } else { new Bpr(RCondition.Rc_z, true, true, result, trueLabel).emit(masm); new Nop().emit(masm); } masm.bind(compareTailCorrectVectorEnd); // Correct the array pointers new Add(array1, VECTOR_SIZE, array1).emit(masm); new Add(array2, VECTOR_SIZE, array2).emit(masm); masm.bind(compareTail); } /** * Emits code to compare the remaining 1 to 4 bytes. */ private void emitTailCompares(SPARCMacroAssembler masm, Register result, Register array1, Register array2, Label trueLabel, Label falseLabel) { Label compare2Bytes = new Label(); Label compare1Byte = new Label(); Register tempReg1 = asRegister(temp3); Register tempReg2 = asRegister(temp4); boolean hasCBcond = masm.hasFeature(CPUFeature.CBCOND); if (kind.getByteCount() <= 4) { // Compare trailing 4 bytes, if any. if (hasCBcond) { new CBcondx(ConditionFlag.Less, result, 4, compare2Bytes).emit(masm); } else { new Cmp(result, 4).emit(masm); new Bpl(Xcc, false, false, compare2Bytes).emit(masm); new Nop().emit(masm); } new Lduw(new SPARCAddress(array1, 0), tempReg1).emit(masm); new Lduw(new SPARCAddress(array2, 0), tempReg2).emit(masm); if (hasCBcond) { new CBcondx(ConditionFlag.NotEqual, tempReg1, tempReg2, falseLabel).emit(masm); } else { new Cmp(tempReg1, tempReg2).emit(masm); new Bpne(Xcc, false, false, falseLabel).emit(masm); new Nop().emit(masm); } if (kind.getByteCount() <= 2) { // Move array pointers forward. new Add(array1, 4, array1).emit(masm); new Add(array2, 4, array2).emit(masm); new Sub(result, 4, result).emit(masm); // Compare trailing 2 bytes, if any. masm.bind(compare2Bytes); if (hasCBcond) { new CBcondx(ConditionFlag.Less, result, 2, compare1Byte).emit(masm); } else { new Cmp(result, 2).emit(masm); new Bpl(Xcc, false, true, compare1Byte).emit(masm); new Nop().emit(masm); } new Lduh(new SPARCAddress(array1, 0), tempReg1).emit(masm); new Lduh(new SPARCAddress(array2, 0), tempReg2).emit(masm); if (hasCBcond) { new CBcondx(ConditionFlag.NotEqual, tempReg1, tempReg2, falseLabel).emit(masm); } else { new Cmp(tempReg1, tempReg2).emit(masm); new Bpne(Xcc, false, true, falseLabel).emit(masm); new Nop().emit(masm); } // The one-byte tail compare is only required for boolean and byte arrays. if (kind.getByteCount() <= 1) { // Move array pointers forward before we compare the last trailing byte. new Add(array1, 2, array1).emit(masm); new Add(array2, 2, array2).emit(masm); new Sub(result, 2, result).emit(masm); // Compare trailing byte, if any. masm.bind(compare1Byte); if (hasCBcond) { new CBcondx(ConditionFlag.NotEqual, result, 1, trueLabel).emit(masm); } else { new Cmp(result, 1).emit(masm); new Bpne(Xcc, trueLabel).emit(masm); new Nop().emit(masm); } new Ldub(new SPARCAddress(array1, 0), tempReg1).emit(masm); new Ldub(new SPARCAddress(array2, 0), tempReg2).emit(masm); if (hasCBcond) { // new SPARCAssembler.Ldx(new SPARCAddress(o7, 1), g3).emit(masm); new CBcondx(ConditionFlag.NotEqual, tempReg1, tempReg2, falseLabel).emit(masm); } else { new Cmp(tempReg1, tempReg2).emit(masm); new Bpne(Xcc, falseLabel).emit(masm); new Nop().emit(masm); } } else { masm.bind(compare1Byte); } } else { masm.bind(compare2Bytes); } } } }