--- /dev/null 2016-05-31 09:42:47.975716356 -0700 +++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.lir.aarch64/src/org/graalvm/compiler/lir/aarch64/AArch64Compare.java 2016-12-09 00:53:36.084190704 -0800 @@ -0,0 +1,174 @@ +/* + * 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 org.graalvm.compiler.lir.aarch64; + +import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.CONST; +import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; +import static org.graalvm.compiler.lir.LIRValueUtil.asJavaConstant; +import static org.graalvm.compiler.lir.LIRValueUtil.isJavaConstant; +import static jdk.vm.ci.code.ValueUtil.asRegister; +import static jdk.vm.ci.code.ValueUtil.isRegister; + +import org.graalvm.compiler.asm.NumUtil; +import org.graalvm.compiler.asm.aarch64.AArch64Assembler; +import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler; +import org.graalvm.compiler.core.common.calc.Condition; +import org.graalvm.compiler.debug.GraalError; +import org.graalvm.compiler.lir.LIRInstructionClass; +import org.graalvm.compiler.lir.asm.CompilationResultBuilder; + +import jdk.vm.ci.aarch64.AArch64Kind; +import jdk.vm.ci.meta.JavaConstant; +import jdk.vm.ci.meta.Value; + +public class AArch64Compare { + + public static class CompareOp extends AArch64LIRInstruction { + public static final LIRInstructionClass TYPE = LIRInstructionClass.create(CompareOp.class); + + @Use protected Value x; + @Use({REG, CONST}) protected Value y; + + public CompareOp(Value x, Value y) { + super(TYPE); + assert ((AArch64Kind) x.getPlatformKind()).isInteger() && ((AArch64Kind) y.getPlatformKind()).isInteger(); + assert x.getPlatformKind() == y.getPlatformKind(); + this.x = x; + this.y = y; + } + + @Override + public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) { + gpCompare(masm, x, y); + } + } + + /** + * Compares integer values x and y. + * + * @param x integer value to compare. May not be null. + * @param y integer value to compare. May not be null. + */ + public static void gpCompare(AArch64MacroAssembler masm, Value x, Value y) { + final int size = x.getPlatformKind().getSizeInBytes() * Byte.SIZE; + if (isRegister(y)) { + masm.cmp(size, asRegister(x), asRegister(y)); + } else { + JavaConstant constant = asJavaConstant(y); + if (constant.isDefaultForKind()) { + masm.cmp(size, asRegister(x), 0); + } else { + final long longValue = constant.asLong(); + assert NumUtil.isInt(longValue); + int maskedValue; + switch (constant.getJavaKind()) { + case Boolean: + case Byte: + maskedValue = (int) (longValue & 0xFF); + break; + case Char: + case Short: + maskedValue = (int) (longValue & 0xFFFF); + break; + case Int: + case Long: + maskedValue = (int) longValue; + break; + default: + throw GraalError.shouldNotReachHere(); + } + masm.cmp(size, asRegister(x), maskedValue); + } + } + } + + public static class FloatCompareOp extends AArch64LIRInstruction { + public static final LIRInstructionClass TYPE = LIRInstructionClass.create(FloatCompareOp.class); + + @Use protected Value x; + @Use({REG, CONST}) protected Value y; + private final Condition condition; + private final boolean unorderedIsTrue; + + public FloatCompareOp(Value x, Value y, Condition condition, boolean unorderedIsTrue) { + super(TYPE); + assert !isJavaConstant(y) || isFloatCmpConstant(y, condition, unorderedIsTrue); + this.x = x; + this.y = y; + this.condition = condition; + this.unorderedIsTrue = unorderedIsTrue; + } + + /** + * Checks if val can be used as a constant for the gpCompare operation or not. + */ + public static boolean isFloatCmpConstant(Value val, Condition condition, boolean unorderedIsTrue) { + // If the condition is "EQ || unordered" or "NE && unordered" we have to use 2 registers + // in any case. + if (!(condition == Condition.EQ && unorderedIsTrue || condition == Condition.NE && !unorderedIsTrue)) { + return false; + } + return isJavaConstant(val) && asJavaConstant(val).isDefaultForKind(); + } + + @Override + public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) { + assert isRegister(x); + int size = x.getPlatformKind().getSizeInBytes() * Byte.SIZE; + if (isRegister(y)) { + masm.fcmp(size, asRegister(x), asRegister(y)); + // There is no condition code for "EQ || unordered" nor one for "NE && unordered", + // so we have to fix them up ourselves. + // In both cases we combine the asked for condition into the EQ, respectively NE + // condition, i.e. + // if EQ && unoreredIsTrue, then the EQ flag will be set if the two values gpCompare + // unequal but are + // unordered. + if (condition == Condition.EQ && unorderedIsTrue) { + // if f1 ordered f2: + // result = f1 == f2 + // else: + // result = EQUAL + int nzcv = 0b0100; // EQUAL -> Z = 1 + masm.fccmp(size, asRegister(x), asRegister(y), nzcv, AArch64Assembler.ConditionFlag.VC); + } else if (condition == Condition.NE && !unorderedIsTrue) { + // if f1 ordered f2: + // result = f1 != f2 + // else: + // result = !NE == EQUAL + int nzcv = 0b0100; // EQUAL -> Z = 1 + masm.fccmp(size, asRegister(x), asRegister(y), nzcv, AArch64Assembler.ConditionFlag.VC); + } + } else { + // cmp against +0.0 + masm.fcmpZero(size, asRegister(x)); + } + } + + @Override + public void verify() { + assert x.getPlatformKind().equals(y.getPlatformKind()) : "a: " + x + " b: " + y; + } + } + +}