Code optimization: warning for code that hangs

[Peter A. Felvegi]

Hello,

>
> So far so good, but J::F() is strange:
>
> Dump of assembler code for function J::F():
>    0x0000000000400498 <+0>:    sub    rsp,0x8
>    0x000000000040049c <+4>:    mov    rax,QWORD PTR [rdi]
>    0x000000000040049f <+7>:    mov    rax,QWORD PTR [rax]
>    0x00000000004004a2 <+10>:    mov    rax,QWORD PTR [rax]
>    0x00000000004004a5 <+13>:    mov    rax,QWORD PTR [rax]
>    0x00000000004004a8 <+16>:    mov    rax,QWORD PTR [rax]
>    0x00000000004004ab <+19>:    mov    rax,QWORD PTR [rax]
>    0x00000000004004ae <+22>:    mov    rax,QWORD PTR [rax]
>    0x00000000004004b1 <+25>:    mov    rax,QWORD PTR [rax]
>    0x00000000004004b4 <+28>:    mov    rdi,QWORD PTR [rax]
>    0x00000000004004b7 <+31>:    call   0x400498 <J::F()>
>    0x00000000004004bc <+36>:    add    rsp,0x8
>    0x00000000004004c0 <+40>:    ret
> End of assembler dump.
>
> What are those mov rax,QWORD PTR [rax]'s ?
No comments on this part? Shouldn't the optimizer eliminated a few of 
those loads?

Regards, Peter