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The GraalVM compiler and the Graal-truffle optimizer.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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).
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package jdk.graal.compiler.lir.aarch64;

import static jdk.vm.ci.code.ValueUtil.asRegister;
import static jdk.graal.compiler.lir.LIRInstruction.OperandFlag.REG;

import jdk.graal.compiler.asm.aarch64.AArch64ASIMDAssembler.ASIMDSize;
import jdk.graal.compiler.asm.aarch64.AArch64ASIMDAssembler.ElementSize;
import jdk.graal.compiler.asm.aarch64.AArch64MacroAssembler;
import jdk.graal.compiler.core.common.LIRKind;
import jdk.graal.compiler.lir.asm.CompilationResultBuilder;
import jdk.graal.compiler.lir.LIRInstructionClass;
import jdk.graal.compiler.lir.Opcode;
import jdk.graal.compiler.lir.gen.LIRGeneratorTool;

import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.AllocatableValue;
import jdk.vm.ci.meta.Value;

@Opcode("MATH_SIGNUM")
public final class AArch64MathSignumOp extends AArch64LIRInstruction {
    public static final LIRInstructionClass TYPE = LIRInstructionClass.create(AArch64MathSignumOp.class);

    @Def({REG}) protected Value result;
    /**
     * This argument must be Alive to ensure that result and input are not assigned to the same
     * register, which would break the code generation by destroying input too early.
     */
    @Alive({REG}) protected Value input;
    @Temp({REG}) protected Value scratch;

    public AArch64MathSignumOp(LIRGeneratorTool tool, Value result, AllocatableValue input) {
        super(TYPE);
        this.result = result;
        this.input = input;
        this.scratch = tool.newVariable(LIRKind.value(input.getPlatformKind()));
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
        Register resultReg = asRegister(result);
        Register inputReg = asRegister(input);
        Register floatScratch = asRegister(scratch);

        int size = result.getPlatformKind().getSizeInBytes() * Byte.SIZE;
        masm.fmov(size, floatScratch, 0.0d);
        masm.neon.facgtSSS(ElementSize.fromKind(result.getPlatformKind()), resultReg, inputReg, floatScratch);
        masm.neon.ushrSSI(ElementSize.DoubleWord, resultReg, resultReg, 1);
        masm.fmov(size, floatScratch, 1.0d);
        masm.neon.bslVVV(ASIMDSize.HalfReg, resultReg, floatScratch, inputReg);
    }
}