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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package org.graalvm.compiler.lir.amd64;

import static jdk.vm.ci.code.ValueUtil.asRegister;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.HINT;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;

import org.graalvm.compiler.asm.amd64.AMD64Assembler.AMD64MOp;
import org.graalvm.compiler.asm.amd64.AMD64BaseAssembler.OperandSize;
import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.Opcode;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.amd64.AMD64;
import jdk.vm.ci.meta.AllocatableValue;

/**
 * AMD64 shift/rotate operation. This operation has a single operand for the first input and output.
 * The second input must be in the RCX register.
 */
public class AMD64ShiftOp extends AMD64LIRInstruction {
    public static final LIRInstructionClass<AMD64ShiftOp> TYPE = LIRInstructionClass.create(AMD64ShiftOp.class);

    @Opcode private final AMD64MOp opcode;
    private final OperandSize size;

    @Def({REG, HINT}) protected AllocatableValue result;
    @Use({REG, STACK}) protected AllocatableValue x;
    @Alive({REG}) protected AllocatableValue y;

    public AMD64ShiftOp(AMD64MOp opcode, OperandSize size, AllocatableValue result, AllocatableValue x, AllocatableValue y) {
        super(TYPE);
        this.opcode = opcode;
        this.size = size;

        this.result = result;
        this.x = x;
        this.y = y;
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
        AMD64Move.move(crb, masm, result, x);
        opcode.emit(masm, size, asRegister(result));
    }

    @Override
    public void verify() {
        assert asRegister(y).equals(AMD64.rcx);
    }
}
