https://www.graalvm.org/ 
public class com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp extends org.graalvm.compiler.lir.amd64.AMD64LIRInstruction
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp
  super_class: org.graalvm.compiler.lir.amd64.AMD64LIRInstruction
{
  public static final org.graalvm.compiler.lir.LIRInstructionClass<com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp> TYPE;
    descriptor: Lorg/graalvm/compiler/lir/LIRInstructionClass;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    Signature: Lorg/graalvm/compiler/lir/LIRInstructionClass<Lcom/oracle/svm/core/graal/amd64/AMD64SafepointCheckOp;>;

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 45
            ldc Lcom/oracle/svm/core/graal/amd64/AMD64SafepointCheckOp;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp.$assertionsDisabled:Z
         3: .line 47
            ldc Lcom/oracle/svm/core/graal/amd64/AMD64SafepointCheckOp;
            invokestatic org.graalvm.compiler.lir.LIRInstructionClass.create:(Ljava/lang/Class;)Lorg/graalvm/compiler/lir/LIRInstructionClass;
            putstatic com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp.TYPE:Lorg/graalvm/compiler/lir/LIRInstructionClass;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp this
         0: .line 50
            aload 0 /* this */
            getstatic com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp.TYPE:Lorg/graalvm/compiler/lir/LIRInstructionClass;
            invokespecial org.graalvm.compiler.lir.amd64.AMD64LIRInstruction.<init>:(Lorg/graalvm/compiler/lir/LIRInstructionClass;)V
         1: .line 51
            return
        end local 0 // com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/svm/core/graal/amd64/AMD64SafepointCheckOp;

  public void emitCode(org.graalvm.compiler.lir.asm.CompilationResultBuilder, org.graalvm.compiler.asm.amd64.AMD64MacroAssembler);
    descriptor: (Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;Lorg/graalvm/compiler/asm/amd64/AMD64MacroAssembler;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=5, args_size=3
        start local 0 // com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp this
        start local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
        start local 2 // org.graalvm.compiler.asm.amd64.AMD64MacroAssembler masm
         0: .line 55
            getstatic com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp.$assertionsDisabled:Z
            ifne 1
            getstatic com.oracle.svm.core.SubstrateOptions.MultiThreaded:Lcom/oracle/svm/core/option/HostedOptionKey;
            invokevirtual com.oracle.svm.core.option.HostedOptionKey.getValue:()Ljava/lang/Object;
            checkcast java.lang.Boolean
            invokevirtual java.lang.Boolean.booleanValue:()Z
            ifne 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 56
      StackMap locals:
      StackMap stack:
            invokestatic com.oracle.svm.core.thread.Safepoint.getThreadLocalSafepointRequestedOffset:()J
            invokestatic java.lang.Math.toIntExact:(J)I
            istore 3 /* safepointRequestedOffset */
        start local 3 // int safepointRequestedOffset
         2: .line 57
            new org.graalvm.compiler.asm.amd64.AMD64Address
            dup
            invokestatic com.oracle.svm.core.ReservedRegisters.singleton:()Lcom/oracle/svm/core/ReservedRegisters;
            invokevirtual com.oracle.svm.core.ReservedRegisters.getThreadRegister:()Ljdk/vm/ci/code/Register;
            iload 3 /* safepointRequestedOffset */
            invokespecial org.graalvm.compiler.asm.amd64.AMD64Address.<init>:(Ljdk/vm/ci/code/Register;I)V
            astore 4 /* safepointRequested */
        start local 4 // org.graalvm.compiler.asm.amd64.AMD64Address safepointRequested
         3: .line 58
            invokestatic com.oracle.svm.core.thread.ThreadingSupportImpl.isRecurringCallbackSupported:()Z
            ifeq 6
         4: .line 59
            aload 2 /* masm */
            aload 4 /* safepointRequested */
            iconst_1
            invokevirtual org.graalvm.compiler.asm.amd64.AMD64MacroAssembler.subl:(Lorg/graalvm/compiler/asm/amd64/AMD64Address;I)V
         5: .line 60
            goto 7
         6: .line 62
      StackMap locals: int org.graalvm.compiler.asm.amd64.AMD64Address
      StackMap stack:
            aload 2 /* masm */
            aload 4 /* safepointRequested */
            iconst_0
            invokevirtual org.graalvm.compiler.asm.amd64.AMD64MacroAssembler.cmpl:(Lorg/graalvm/compiler/asm/amd64/AMD64Address;I)V
         7: .line 64
      StackMap locals:
      StackMap stack:
            return
        end local 4 // org.graalvm.compiler.asm.amd64.AMD64Address safepointRequested
        end local 3 // int safepointRequestedOffset
        end local 2 // org.graalvm.compiler.asm.amd64.AMD64MacroAssembler masm
        end local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
        end local 0 // com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp this
      LocalVariableTable:
        Start  End  Slot                      Name  Signature
            0    8     0                      this  Lcom/oracle/svm/core/graal/amd64/AMD64SafepointCheckOp;
            0    8     1                       crb  Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;
            0    8     2                      masm  Lorg/graalvm/compiler/asm/amd64/AMD64MacroAssembler;
            2    8     3  safepointRequestedOffset  I
            3    8     4        safepointRequested  Lorg/graalvm/compiler/asm/amd64/AMD64Address;
    MethodParameters:
      Name  Flags
      crb   
      masm  

  public org.graalvm.compiler.asm.amd64.AMD64Assembler$ConditionFlag getConditionFlag();
    descriptor: ()Lorg/graalvm/compiler/asm/amd64/AMD64Assembler$ConditionFlag;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp this
         0: .line 67
            getstatic org.graalvm.compiler.asm.amd64.AMD64Assembler$ConditionFlag.LessEqual:Lorg/graalvm/compiler/asm/amd64/AMD64Assembler$ConditionFlag;
            areturn
        end local 0 // com.oracle.svm.core.graal.amd64.AMD64SafepointCheckOp this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/core/graal/amd64/AMD64SafepointCheckOp;
}
SourceFile: "AMD64SafepointCheckOp.java"
InnerClasses:
  public final ConditionFlag = org.graalvm.compiler.asm.amd64.AMD64Assembler$ConditionFlag of org.graalvm.compiler.asm.amd64.AMD64Assembler
    RuntimeVisibleAnnotations: 
      org.graalvm.compiler.lir.Opcode()