Assembler questions

[Rémi Forax]

Hi guys,
I'm trying to read some assembler dump printed by hsdis.

In the snippet below, I don't understand why there is a %r12 in the 
middle of the mov.
Is some intermediary result stored in %r12 ?
Is it equivalent to
   move 0x8(%r11), %r12
   move 0x78(%r12), %rbp ?

Another question more related to the layout of the class in hotspot.
It seems there are two kinds of class pointer, the one with the type 
java/lang/Class
and another one used by checkcast (oop('A')).
I suppose it's the same object at two different offsets perhaps the Java 
one and the C++ one
but  I don't understand why they both exist in the generated code.

And the last question is why the checkcast is not removed because
the test getClass() == A.class is just above.
Is the VM also lost with the double representation of a class ?

regards,
Rémi

0x00007f67a46e326c: mov    0x8(%rsi),%r11d    ; implicit exception: 
dispatches to 0x00007f67a46e32ea
   ;; B2: #    B7 B3 <- B1  Freq: 0.999999

   0x00007f67a46e3270: mov    0x78(%r12,%r11,8),%rbp  ;*invokevirtual 
getClass
                                                 ; - RT::classCheck at 1 
(line 102)
                                                 ; - 
java.lang.invoke.MethodHandle::invokeExact at 3
                                                 ; - 
java.lang.invoke.MethodHandle::invokeExact at 3
                                                 ; - IndyTest::test at 1
   0x00007f67a46e3275: mov    $0x7d6bb4228,%r10  ;   {oop(a 
'java/lang/Class' = 'A')}
   0x00007f67a46e327f: cmp    %r10,%rbp
   0x00007f67a46e3282: jne    0x00007f67a46e32c9  ;*if_acmpne
                                                 ; - RT::classCheck at 5 
(line 102)
                                                 ; - 
java.lang.invoke.MethodHandle::invokeExact at 3
                                                 ; - 
java.lang.invoke.MethodHandle::invokeExact at 3
                                                 ; - IndyTest::test at 1
   ;; B3: #    B6 B4 <- B2  Freq: 0.999999

   0x00007f67a46e3284: mov    0x40(%r12,%r11,8),%r10
   0x00007f67a46e3289: mov    $0x77f280d58,%r11  ;   {oop('A')}
   0x00007f67a46e3293: cmp    %r11,%r10
   0x00007f67a46e3296: jne    0x00007f67a46e32b4  ;*checkcast
                                                 ; - 
java.lang.invoke.MethodHandle::invokeExact at 1
                                                 ; - 
java.lang.invoke.MethodHandle::invokeExact at 21
                                                 ; - IndyTest::test at 1