https://www.graalvm.org/ 
public class org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp extends org.graalvm.compiler.lir.StandardOp$SaveRegistersOp
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp
  super_class: org.graalvm.compiler.lir.StandardOp$SaveRegistersOp
{
  public static final org.graalvm.compiler.lir.LIRInstructionClass<org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp> TYPE;
    descriptor: Lorg/graalvm/compiler/lir/LIRInstructionClass;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    Signature: Lorg/graalvm/compiler/lir/LIRInstructionClass<Lorg/graalvm/compiler/lir/amd64/AMD64SaveRegistersOp;>;

  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 47
            ldc Lorg/graalvm/compiler/lir/amd64/AMD64SaveRegistersOp;
            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 org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.$assertionsDisabled:Z
         3: .line 48
            ldc Lorg/graalvm/compiler/lir/amd64/AMD64SaveRegistersOp;
            invokestatic org.graalvm.compiler.lir.LIRInstructionClass.create:(Ljava/lang/Class;)Lorg/graalvm/compiler/lir/LIRInstructionClass;
            putstatic org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.TYPE:Lorg/graalvm/compiler/lir/LIRInstructionClass;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(jdk.vm.ci.code.Register[], jdk.vm.ci.meta.AllocatableValue[]);
    descriptor: ([Ljdk/vm/ci/code/Register;[Ljdk/vm/ci/meta/AllocatableValue;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
        start local 1 // jdk.vm.ci.code.Register[] savedRegisters
        start local 2 // jdk.vm.ci.meta.AllocatableValue[] savedRegisterLocations
         0: .line 57
            aload 0 /* this */
            getstatic org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.TYPE:Lorg/graalvm/compiler/lir/LIRInstructionClass;
            aload 1 /* savedRegisters */
            aload 2 /* savedRegisterLocations */
            invokespecial org.graalvm.compiler.lir.StandardOp$SaveRegistersOp.<init>:(Lorg/graalvm/compiler/lir/LIRInstructionClass;[Ljdk/vm/ci/code/Register;[Ljdk/vm/ci/meta/AllocatableValue;)V
         1: .line 58
            return
        end local 2 // jdk.vm.ci.meta.AllocatableValue[] savedRegisterLocations
        end local 1 // jdk.vm.ci.code.Register[] savedRegisters
        end local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
      LocalVariableTable:
        Start  End  Slot                    Name  Signature
            0    2     0                    this  Lorg/graalvm/compiler/lir/amd64/AMD64SaveRegistersOp;
            0    2     1          savedRegisters  [Ljdk/vm/ci/code/Register;
            0    2     2  savedRegisterLocations  [Ljdk/vm/ci/meta/AllocatableValue;
    MethodParameters:
                        Name  Flags
      savedRegisters          
      savedRegisterLocations  

  protected void <init>(org.graalvm.compiler.lir.LIRInstructionClass<org.graalvm.compiler.lir.amd64.vector.AMD64VectorMove$SaveRegistersOp>, jdk.vm.ci.code.Register[], jdk.vm.ci.meta.AllocatableValue[]);
    descriptor: (Lorg/graalvm/compiler/lir/LIRInstructionClass;[Ljdk/vm/ci/code/Register;[Ljdk/vm/ci/meta/AllocatableValue;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
        start local 1 // org.graalvm.compiler.lir.LIRInstructionClass type
        start local 2 // jdk.vm.ci.code.Register[] savedRegisters
        start local 3 // jdk.vm.ci.meta.AllocatableValue[] slots
         0: .line 61
            aload 0 /* this */
            aload 1 /* type */
            aload 2 /* savedRegisters */
            aload 3 /* slots */
            invokespecial org.graalvm.compiler.lir.StandardOp$SaveRegistersOp.<init>:(Lorg/graalvm/compiler/lir/LIRInstructionClass;[Ljdk/vm/ci/code/Register;[Ljdk/vm/ci/meta/AllocatableValue;)V
         1: .line 62
            return
        end local 3 // jdk.vm.ci.meta.AllocatableValue[] slots
        end local 2 // jdk.vm.ci.code.Register[] savedRegisters
        end local 1 // org.graalvm.compiler.lir.LIRInstructionClass type
        end local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    2     0            this  Lorg/graalvm/compiler/lir/amd64/AMD64SaveRegistersOp;
            0    2     1            type  Lorg/graalvm/compiler/lir/LIRInstructionClass<Lorg/graalvm/compiler/lir/amd64/vector/AMD64VectorMove$SaveRegistersOp;>;
            0    2     2  savedRegisters  [Ljdk/vm/ci/code/Register;
            0    2     3           slots  [Ljdk/vm/ci/meta/AllocatableValue;
    Signature: (Lorg/graalvm/compiler/lir/LIRInstructionClass<Lorg/graalvm/compiler/lir/amd64/vector/AMD64VectorMove$SaveRegistersOp;>;[Ljdk/vm/ci/code/Register;[Ljdk/vm/ci/meta/AllocatableValue;)V
    MethodParameters:
                Name  Flags
      type            
      savedRegisters  
      slots           

  protected void saveRegister(org.graalvm.compiler.lir.asm.CompilationResultBuilder, org.graalvm.compiler.asm.amd64.AMD64MacroAssembler, jdk.vm.ci.code.StackSlot, jdk.vm.ci.code.Register);
    descriptor: (Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;Lorg/graalvm/compiler/asm/amd64/AMD64MacroAssembler;Ljdk/vm/ci/code/StackSlot;Ljdk/vm/ci/code/Register;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=5, locals=5, args_size=5
        start local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
        start local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
        start local 2 // org.graalvm.compiler.asm.amd64.AMD64MacroAssembler masm
        start local 3 // jdk.vm.ci.code.StackSlot result
        start local 4 // jdk.vm.ci.code.Register input
         0: .line 65
            aload 3 /* result */
            invokevirtual jdk.vm.ci.code.StackSlot.getPlatformKind:()Ljdk/vm/ci/meta/PlatformKind;
            checkcast jdk.vm.ci.amd64.AMD64Kind
            aload 1 /* crb */
            aload 2 /* masm */
            aload 3 /* result */
            aload 4 /* input */
            invokestatic org.graalvm.compiler.lir.amd64.AMD64Move.reg2stack:(Ljdk/vm/ci/amd64/AMD64Kind;Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;Lorg/graalvm/compiler/asm/amd64/AMD64MacroAssembler;Ljdk/vm/ci/meta/Value;Ljdk/vm/ci/code/Register;)V
         1: .line 66
            return
        end local 4 // jdk.vm.ci.code.Register input
        end local 3 // jdk.vm.ci.code.StackSlot result
        end local 2 // org.graalvm.compiler.asm.amd64.AMD64MacroAssembler masm
        end local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
        end local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/compiler/lir/amd64/AMD64SaveRegistersOp;
            0    2     1     crb  Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;
            0    2     2    masm  Lorg/graalvm/compiler/asm/amd64/AMD64MacroAssembler;
            0    2     3  result  Ljdk/vm/ci/code/StackSlot;
            0    2     4   input  Ljdk/vm/ci/code/Register;
    MethodParameters:
        Name  Flags
      crb     
      masm    
      result  
      input   

  public void emitCode(org.graalvm.compiler.lir.asm.CompilationResultBuilder);
    descriptor: (Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=4, args_size=2
        start local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
        start local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
         0: .line 70
            aload 1 /* crb */
            getfield org.graalvm.compiler.lir.asm.CompilationResultBuilder.asm:Lorg/graalvm/compiler/asm/Assembler;
            checkcast org.graalvm.compiler.asm.amd64.AMD64MacroAssembler
            astore 2 /* masm */
        start local 2 // org.graalvm.compiler.asm.amd64.AMD64MacroAssembler masm
         1: .line 71
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         2: goto 7
         3: .line 72
      StackMap locals: org.graalvm.compiler.asm.amd64.AMD64MacroAssembler int
      StackMap stack:
            aload 0 /* this */
            getfield org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.savedRegisters:[Ljdk/vm/ci/code/Register;
            iload 3 /* i */
            aaload
            ifnull 6
         4: .line 73
            getstatic org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.$assertionsDisabled:Z
            ifne 5
            aload 0 /* this */
            getfield org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.slots:[Ljdk/vm/ci/meta/AllocatableValue;
            iload 3 /* i */
            aaload
            invokestatic jdk.vm.ci.code.ValueUtil.isStackSlot:(Ljdk/vm/ci/meta/Value;)Z
            ifne 5
            new java.lang.AssertionError
            dup
            new java.lang.StringBuilder
            dup
            ldc "not a StackSlot: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.slots:[Ljdk/vm/ci/meta/AllocatableValue;
            iload 3 /* i */
            aaload
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
         5: .line 74
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* crb */
            aload 2 /* masm */
            aload 0 /* this */
            getfield org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.slots:[Ljdk/vm/ci/meta/AllocatableValue;
            iload 3 /* i */
            aaload
            invokestatic jdk.vm.ci.code.ValueUtil.asStackSlot:(Ljdk/vm/ci/meta/Value;)Ljdk/vm/ci/code/StackSlot;
            aload 0 /* this */
            getfield org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.savedRegisters:[Ljdk/vm/ci/code/Register;
            iload 3 /* i */
            aaload
            invokevirtual org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.saveRegister:(Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;Lorg/graalvm/compiler/asm/amd64/AMD64MacroAssembler;Ljdk/vm/ci/code/StackSlot;Ljdk/vm/ci/code/Register;)V
         6: .line 71
      StackMap locals:
      StackMap stack:
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         7: iload 3 /* i */
            aload 0 /* this */
            getfield org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.savedRegisters:[Ljdk/vm/ci/code/Register;
            arraylength
            if_icmplt 3
        end local 3 // int i
         8: .line 77
            return
        end local 2 // org.graalvm.compiler.asm.amd64.AMD64MacroAssembler masm
        end local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
        end local 0 // org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lorg/graalvm/compiler/lir/amd64/AMD64SaveRegistersOp;
            0    9     1   crb  Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;
            1    9     2  masm  Lorg/graalvm/compiler/asm/amd64/AMD64MacroAssembler;
            2    8     3     i  I
    MethodParameters:
      Name  Flags
      crb   
}
SourceFile: "AMD64SaveRegistersOp.java"
InnerClasses:
  public abstract SaveRegistersOp = org.graalvm.compiler.lir.StandardOp$SaveRegistersOp of org.graalvm.compiler.lir.StandardOp
  public SaveRegistersOp = org.graalvm.compiler.lir.amd64.vector.AMD64VectorMove$SaveRegistersOp of org.graalvm.compiler.lir.amd64.vector.AMD64VectorMove
    RuntimeVisibleAnnotations: 
      org.graalvm.compiler.lir.Opcode(value = "SAVE_REGISTER")