src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/vector/AMD64VectorClearOp.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
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package org.graalvm.compiler.lir.amd64.vector;

import static org.graalvm.compiler.asm.amd64.AMD64VectorAssembler.VexRVMOp.VPXOR;
import static org.graalvm.compiler.asm.amd64.AMD64VectorAssembler.VexRVMOp.VXORPD;
import static org.graalvm.compiler.asm.amd64.AMD64VectorAssembler.VexRVMOp.VXORPS;
import static org.graalvm.compiler.asm.amd64.AVXKind.AVXSize.XMM;
import static jdk.vm.ci.code.ValueUtil.asRegister;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;

import org.graalvm.compiler.lir.LIRInstruction;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import org.graalvm.compiler.asm.amd64.AMD64VectorAssembler;
import org.graalvm.compiler.asm.amd64.AVXKind;

import jdk.vm.ci.amd64.AMD64Kind;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.AllocatableValue;

public class AMD64VectorClearOp extends AMD64VectorLIRInstruction {
    public static final LIRInstructionClass<AMD64VectorClearOp> TYPE = LIRInstructionClass.create(AMD64VectorClearOp.class);

    protected @LIRInstruction.Def({REG}) AllocatableValue result;

    public AMD64VectorClearOp(AllocatableValue result) {
        this(TYPE, result);
    }

    protected AMD64VectorClearOp(LIRInstructionClass<? extends AMD64VectorClearOp> c, AllocatableValue result) {
        super(c);
        this.result = result;
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AMD64VectorAssembler vasm) {
        AMD64Kind kind = (AMD64Kind) result.getPlatformKind();
        Register register = asRegister(result);

        switch (kind.getScalar()) {
            case SINGLE:
                VXORPS.emit(vasm, AVXKind.getRegisterSize(kind), register, register, register);
                break;

            case DOUBLE:
                VXORPD.emit(vasm, AVXKind.getRegisterSize(kind), register, register, register);
                break;

            default:
                // on AVX1, YMM VPXOR is not supported - still it is possible to clear the whole YMM
                // register as the upper 128-bit are implicitly cleared by the AVX1 instruction.
                VPXOR.emit(vasm, XMM, register, register, register);
        }
    }
}