src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.aarch64/src/org/graalvm/compiler/lir/aarch64/AArch64SignExtendOp.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.lir.aarch64;

import static jdk.vm.ci.code.ValueUtil.asRegister;

import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.Opcode;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

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

@Opcode("SIGNEXTEND")
public class AArch64SignExtendOp extends AArch64LIRInstruction {
    private static final LIRInstructionClass<AArch64SignExtendOp> TYPE = LIRInstructionClass.create(AArch64SignExtendOp.class);

    @Def protected AllocatableValue resultValue;
    @Use protected AllocatableValue inputValue;
    private final int fromBits;
    private final int toBits;

    public AArch64SignExtendOp(AllocatableValue resultValue, AllocatableValue inputValue, int fromBits, int toBits) {
        super(TYPE);
        this.resultValue = resultValue;
        this.inputValue = inputValue;
        this.fromBits = fromBits;
        this.toBits = toBits;
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
        Register result = asRegister(resultValue);
        Register input = asRegister(inputValue);
        masm.sxt(toBits <= 32 ? 32 : 64, fromBits, result, input);
    }
}