Mercurial > hg > truffle
view graal/com.oracle.graal.lir.sparc/src/com/oracle/graal/lir/sparc/SPARCArrayEqualsOp.java @ 21541:5e868236654f
moved UnsafeAccess to com.oracle.jvmci.common (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 25 May 2015 22:17:10 +0200 |
parents | cdb5eda3a4b5 |
children | 48c1ebd24120 |
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/* * Copyright (c) 2013, 2015, 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.asm.sparc.SPARCAssembler.Annul.*; import static com.oracle.graal.asm.sparc.SPARCAssembler.BranchPredict.*; import static com.oracle.graal.asm.sparc.SPARCAssembler.CC.*; import static com.oracle.graal.asm.sparc.SPARCAssembler.ConditionFlag.*; import static com.oracle.graal.asm.sparc.SPARCAssembler.RCondition.*; import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*; import static com.oracle.graal.sparc.SPARC.*; import static com.oracle.graal.sparc.SPARC.CPUFeature.*; import static com.oracle.jvmci.common.UnsafeAccess.*; 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.SPARCAssembler.CC; import com.oracle.graal.asm.sparc.SPARCAssembler.ConditionFlag; import com.oracle.graal.lir.*; import com.oracle.graal.lir.asm.*; import com.oracle.graal.lir.gen.*; import com.oracle.graal.sparc.SPARC.CPUFeature; /** * Emits code which compares two arrays of the same length. */ @Opcode("ARRAY_EQUALS") public final class SPARCArrayEqualsOp extends SPARCLIRInstruction { public static final LIRInstructionClass<SPARCArrayEqualsOp> TYPE = LIRInstructionClass.create(SPARCArrayEqualsOp.class); 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) { super(TYPE); 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. masm.add(asObjectReg(array1Value), arrayBaseOffset, array1); masm.add(asObjectReg(array2Value), arrayBaseOffset, array2); // Get array length in bytes. masm.mulx(asIntReg(lengthValue), arrayIndexScale, length); masm.mov(length, result); // copy emit8ByteCompare(masm, result, array1, array2, length, trueLabel, falseLabel); emitTailCompares(masm, result, array1, array2, trueLabel, falseLabel); // Return true masm.bind(trueLabel); masm.mov(1, result); masm.bicc(Always, ANNUL, done); masm.nop(); // Return false masm.bind(falseLabel); masm.mov(g0, result); // 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) { assert lengthValue.getPlatformKind().equals(Kind.Int); 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); masm.sra(length, 0, length); masm.and(result, VECTOR_SIZE - 1, result); // tail count (in bytes) masm.andcc(length, ~(VECTOR_SIZE - 1), length); // vector count (in bytes) masm.bpcc(ConditionFlag.Equal, NOT_ANNUL, compareTail, CC.Xcc, PREDICT_NOT_TAKEN); masm.sub(length, VECTOR_SIZE, length); // Delay slot masm.add(array1, length, array1); masm.add(array2, length, array2); masm.sub(g0, length, length); // Compare the last element first masm.ldx(new SPARCAddress(array1, 0), tempReg1); masm.ldx(new SPARCAddress(array2, 0), tempReg2); if (hasCBcond) { masm.cbcondx(NotEqual, tempReg1, tempReg2, falseLabel); masm.nop(); // for optimal performance (see manual) masm.cbcondx(Equal, length, 0, compareTailCorrectVectorEnd); masm.nop(); // for optimal performance (see manual) } else { masm.cmp(tempReg1, tempReg2); masm.bpcc(NotEqual, NOT_ANNUL, falseLabel, Xcc, PREDICT_NOT_TAKEN); masm.nop(); masm.bpr(Rc_z, NOT_ANNUL, compareTailCorrectVectorEnd, PREDICT_NOT_TAKEN, length); masm.nop(); } // Load the first value from array 1 (Later done in back branch delay-slot) masm.ldx(new SPARCAddress(array1, length), tempReg1); masm.bind(loop); masm.ldx(new SPARCAddress(array2, length), tempReg2); masm.cmp(tempReg1, tempReg2); masm.bpcc(NotEqual, NOT_ANNUL, falseLabel, Xcc, PREDICT_NOT_TAKEN); // Delay slot, not annul, add for next iteration masm.addcc(length, VECTOR_SIZE, length); // Annul, to prevent access past the array masm.bpcc(NotEqual, ANNUL, loop, Xcc, PREDICT_TAKEN); masm.ldx(new SPARCAddress(array1, length), tempReg1); // Load in delay slot // Tail count zero, therefore we can go to the end if (hasCBcond) { masm.cbcondx(Equal, result, 0, trueLabel); } else { masm.bpr(Rc_z, NOT_ANNUL, trueLabel, PREDICT_TAKEN, result); masm.nop(); } masm.bind(compareTailCorrectVectorEnd); // Correct the array pointers masm.add(array1, VECTOR_SIZE, array1); masm.add(array2, VECTOR_SIZE, array2); 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(CBCOND); if (kind.getByteCount() <= 4) { // Compare trailing 4 bytes, if any. if (hasCBcond) { masm.cbcondx(Less, result, 4, compare2Bytes); } else { masm.cmp(result, 4); masm.bpcc(Less, NOT_ANNUL, compare2Bytes, Xcc, PREDICT_NOT_TAKEN); masm.nop(); } masm.lduw(new SPARCAddress(array1, 0), tempReg1); masm.lduw(new SPARCAddress(array2, 0), tempReg2); if (hasCBcond) { masm.cbcondx(NotEqual, tempReg1, tempReg2, falseLabel); } else { masm.cmp(tempReg1, tempReg2); masm.bpcc(NotEqual, NOT_ANNUL, falseLabel, Xcc, PREDICT_NOT_TAKEN); masm.nop(); } if (kind.getByteCount() <= 2) { // Move array pointers forward. masm.add(array1, 4, array1); masm.add(array2, 4, array2); masm.sub(result, 4, result); // Compare trailing 2 bytes, if any. masm.bind(compare2Bytes); if (hasCBcond) { masm.cbcondx(Less, result, 2, compare1Byte); } else { masm.cmp(result, 2); masm.bpcc(Less, NOT_ANNUL, compare1Byte, Xcc, PREDICT_TAKEN); masm.nop(); } masm.lduh(new SPARCAddress(array1, 0), tempReg1); masm.lduh(new SPARCAddress(array2, 0), tempReg2); if (hasCBcond) { masm.cbcondx(NotEqual, tempReg1, tempReg2, falseLabel); } else { masm.cmp(tempReg1, tempReg2); masm.bpcc(NotEqual, NOT_ANNUL, falseLabel, Xcc, PREDICT_TAKEN); masm.nop(); } // 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. masm.add(array1, 2, array1); masm.add(array2, 2, array2); masm.sub(result, 2, result); // Compare trailing byte, if any. masm.bind(compare1Byte); if (hasCBcond) { masm.cbcondx(NotEqual, result, 1, trueLabel); } else { masm.cmp(result, 1); masm.bpcc(NotEqual, NOT_ANNUL, trueLabel, Xcc, PREDICT_TAKEN); masm.nop(); } masm.ldub(new SPARCAddress(array1, 0), tempReg1); masm.ldub(new SPARCAddress(array2, 0), tempReg2); if (hasCBcond) { masm.cbcondx(NotEqual, tempReg1, tempReg2, falseLabel); } else { masm.cmp(tempReg1, tempReg2); masm.bpcc(NotEqual, NOT_ANNUL, falseLabel, Xcc, PREDICT_TAKEN); masm.nop(); } } else { masm.bind(compare1Byte); } } else { masm.bind(compare2Bytes); } } } }