上代码，希望懂的朋友指点下！！拜谢

(lldb) ni
Process 13409 stopped
* thread #1: tid = 0xe7225, 0x00007fff958920dd libobjc.A.dylib`objc_msgSend + 29, queue = 'com.apple.main-thread', stop reason = instruction step over
    frame #0: 0x00007fff958920dd libobjc.A.dylib`objc_msgSend + 29
libobjc.A.dylib`objc_msgSend:
->  0x7fff958920dd <+29>: andl   0x18(%r11), %r10d   //这句代码执行后 r10就全零了 不懂？？
    0x7fff958920e1 <+33>: shlq   $0x4, %r10
    0x7fff958920e5 <+37>: addq   0x10(%r11), %r10
    0x7fff958920e9 <+41>: cmpq   (%r10), %rsi
(lldb) re read rdi rsi r11 r10
     rdi = 0x0000000100201200
     rsi = 0x00007fff965eb509
     r11 = 0x00007fff5fbffa40
     r10 = 0x00007fff965eb509  //之前的值
(lldb) ni
Process 13409 stopped
* thread #1: tid = 0xe7225, 0x00007fff958920e1 libobjc.A.dylib`objc_msgSend + 33, queue = 'com.apple.main-thread', stop reason = instruction step over
    frame #0: 0x00007fff958920e1 libobjc.A.dylib`objc_msgSend + 33
libobjc.A.dylib`objc_msgSend:
->  0x7fff958920e1 <+33>: shlq   $0x4, %r10
    0x7fff958920e5 <+37>: addq   0x10(%r11), %r10
    0x7fff958920e9 <+41>: cmpq   (%r10), %rsi
    0x7fff958920ec <+44>: jne    0x7fff958920f2            ; <+50>
(lldb) re read rdi rsi r11 r10
     rdi = 0x0000000100201200
     rsi = 0x00007fff965eb509
     r11 = 0x00007fff5fbffa40
     r10 = 0x0000000000000000 //全零了
(lldb) x 0x00007fff5fbffa40    //%r11
0x7fff5fbffa40: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc  ????????????????
0x7fff5fbffa50: f0 ff 6f 00 01 00 00 00 00 00 00 08 00 00 00 00  ??o.............
(lldb) x 0x00007fff5fbffa58    //0x18(%r11)
0x7fff5fbffa58: 00 00 00 08 00 00 00 00 20 ab 08 10 96 e3 00 04  ........ ?...?..
0x7fff5fbffa68: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

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