Troubleshooting the sense of this asm x86 code

Question

First of all, here is the assembler code:

/           0x000006a0      55             push rbp                             
|           0x000006a1      4889e5         mov rbp, rsp                         
|           0x000006a4      4883ec10       sub rsp, 0x10                        
|           0x000006a8      488d05b50000.  lea rax, str.AAAA           ; 0x764  

|           0x000006af      488945f8       mov qword [local_8h], rax  
|           0x000006b3      488b45f8       mov rax, qword [local_8h]

|           0x000006b7      4889c6         mov rsi, rax                         
|           0x000006ba      488d3da80000.  lea rdi, 0x00000769         ; "%s"   
|           0x000006c1      b800000000     mov eax, 0                           
|           0x000006c6      e895feffff     call sym.imp.printf         ;[2] ; i 
|           0x000006cb      b800000000     mov eax, 0                           
|           0x000006d0      c9             leave                                
\           0x000006d1      c3             ret  

to this c program:

#include <stdio.h>
#include <string.h>

int main(){

    char* a = "AAAA";

    printf("%s", a);
    return 0;
}

Especially I have a question to this code snipped:

|           0x000006af      488945f8       mov qword [local_8h], rax            
|           0x000006b3      488b45f8       mov rax, qword [local_8h]

What is the sense of these two instructions? I only see the same instruction one way and than reversed. But why is that?

Here are some further information to the executable:

blksz    0x0
block    0x100
fd       6
file     demo
format   elf64
iorw     false
mode     -r--
size     0x20e0
humansz  8.2K
type     DYN (Shared object file)
arch     x86
binsz    6559
bintype  elf
bits     64
canary   false
class    ELF64
crypto   false
endian   little
havecode true
intrp    /lib64/ld-linux-x86-64.so.2
lang     c
linenum  true
lsyms    true
machine  AMD x86-64 architecture
maxopsz  16
minopsz  1
nx       true
os       linux
pcalign  0
pic      true
relocs   true
relro    partial relro
rpath    NONE
static   false
stripped false
subsys   linux
va       true

Answer 1

The lines are seperate from each other:

The first line belongs to the line char* a = "AAAA";, saving the value of the variable to RAM.

The second line accesses the variable from RAM for the line printf("%s", a); as the parameter.

Technically, both lines would be optional, as you could have written:

printf("%s", "AAAA");

EDIT: For skipping this unnecessary code, you could enable automatic optimizations (for GCC: -O2)