1 /* 2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.hotspot.sparc; 24 25 import static jdk.vm.ci.code.ValueUtil.asRegister; 26 import static jdk.vm.ci.sparc.SPARC.g0; 27 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BPCC; 28 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.CBCOND; 29 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.INSTRUCTION_SIZE; 30 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.Annul.ANNUL; 31 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BranchPredict.PREDICT_TAKEN; 32 import static org.graalvm.compiler.lir.sparc.SPARCMove.loadFromConstantTable; 33 34 import org.graalvm.compiler.asm.Assembler.LabelHint; 35 import org.graalvm.compiler.asm.Label; 36 import org.graalvm.compiler.asm.sparc.SPARCAssembler.CC; 37 import org.graalvm.compiler.asm.sparc.SPARCAssembler.ConditionFlag; 38 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler; 39 import org.graalvm.compiler.core.common.calc.Condition; 40 import org.graalvm.compiler.lir.LIRInstructionClass; 41 import org.graalvm.compiler.lir.LabelRef; 42 import org.graalvm.compiler.lir.SwitchStrategy; 43 import org.graalvm.compiler.lir.Variable; 44 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 45 import org.graalvm.compiler.lir.sparc.SPARCControlFlow; 46 import org.graalvm.compiler.lir.sparc.SPARCDelayedControlTransfer; 47 48 import jdk.vm.ci.code.Register; 49 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant; 50 import jdk.vm.ci.meta.AllocatableValue; 51 import jdk.vm.ci.meta.Constant; 52 import jdk.vm.ci.meta.Value; 53 import jdk.vm.ci.sparc.SPARC.CPUFeature; 54 55 final class SPARCHotSpotStrategySwitchOp extends SPARCControlFlow.StrategySwitchOp { 56 public static final LIRInstructionClass<SPARCHotSpotStrategySwitchOp> TYPE = LIRInstructionClass.create(SPARCHotSpotStrategySwitchOp.class); 57 58 SPARCHotSpotStrategySwitchOp(Value constantTableBase, SwitchStrategy strategy, LabelRef[] keyTargets, LabelRef defaultTarget, AllocatableValue key, Variable scratch) { 59 super(TYPE, constantTableBase, strategy, keyTargets, defaultTarget, key, scratch); 60 } 61 62 public class HotSpotSwitchClosure extends SwitchClosure { 63 protected HotSpotSwitchClosure(Register keyRegister, Register constantBaseRegister, CompilationResultBuilder crb, SPARCMacroAssembler masm) { 64 super(keyRegister, constantBaseRegister, crb, masm); 65 } 66 67 @Override 68 protected void conditionalJump(int index, Condition condition, Label target) { 69 if (keyConstants[index] instanceof HotSpotMetaspaceConstant) { 70 HotSpotMetaspaceConstant constant = (HotSpotMetaspaceConstant) keyConstants[index]; 71 CC conditionCode = constant.isCompressed() ? CC.Icc : CC.Xcc; 72 ConditionFlag conditionFlag = SPARCControlFlow.fromCondition(true, condition, false); 73 LabelHint hint = requestHint(masm, target); 74 75 // Load constant takes one instruction 76 int cbCondPosition = masm.position() + INSTRUCTION_SIZE; 77 boolean canUseShortBranch = masm.hasFeature(CPUFeature.CBCOND) && SPARCControlFlow.isShortBranch(masm, cbCondPosition, hint, target); 78 79 Register scratchRegister = asRegister(scratch); 80 loadFromConstantTable(crb, masm, asRegister(constantTableBase), constant, scratchRegister, SPARCDelayedControlTransfer.DUMMY); 81 82 if (canUseShortBranch) { 83 CBCOND.emit(masm, conditionFlag, conditionCode == CC.Xcc, keyRegister, scratchRegister, target); 84 } else { 85 masm.cmp(keyRegister, scratchRegister); 86 BPCC.emit(masm, conditionCode, conditionFlag, ANNUL, PREDICT_TAKEN, target); 87 masm.nop(); // delay slot 88 } 89 } else { 90 super.conditionalJump(index, condition, target); 91 } 92 } 93 } 94 95 @Override 96 protected int estimateEmbeddedSize(Constant c) { 97 if (c instanceof HotSpotMetaspaceConstant) { 98 return ((HotSpotMetaspaceConstant) c).isCompressed() ? 4 : 8; 99 } else { 100 return super.estimateEmbeddedSize(c); 101 } 102 } 103 104 @Override 105 public void emitCode(final CompilationResultBuilder crb, final SPARCMacroAssembler masm) { 106 final Register keyRegister = asRegister(key); 107 final Register constantBaseRegister = AllocatableValue.ILLEGAL.equals(constantTableBase) ? g0 : asRegister(constantTableBase); 108 strategy.run(new HotSpotSwitchClosure(keyRegister, constantBaseRegister, crb, masm)); 109 } 110 }