Re: Testing memory performance

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

On Sun, 18 Nov 2018 22:50:17 +0100
Rhialto <rhialto%falu.nl@localhost> wrote:

> On Sun 18 Nov 2018 at 19:04:02 +0000, Sad Clouds wrote:
> > Linux (gcc 6.3.0):
> 
> It looks to me like this fragment is not the whole function:
> 
> > Dump of assembler code for function memcpy:
> > => 0x00007ffff78a0e90 <+0>:   mov    %rdi,%rax
> >    0x00007ffff78a0e93 <+3>:   cmp    $0x10,%rdx
> >    0x00007ffff78a0e97 <+7>:   jb     0x7ffff78a0f77
> 
> 0x7ffff78a0f77 isn't in the disassembly
> 
> >    0x00007ffff78a0e9d <+13>:  cmp    $0x20,%rdx
> >    0x00007ffff78a0ea1 <+17>:  ja     0x7ffff78a0fc6
> 
> 0x7ffff78a0fc6 neither.
> 
> >    0x00007ffff78a0ea7 <+23>:  movups (%rsi),%xmm0
> >    0x00007ffff78a0eaa <+26>:  movups -0x10(%rsi,%rdx,1),%xmm1
> >    0x00007ffff78a0eaf <+31>:  movups %xmm0,(%rdi)
> >    0x00007ffff78a0eb2 <+34>:  movups %xmm1,-0x10(%rdi,%rdx,1)
> >    0x00007ffff78a0eb7 <+39>:  retq   
> > End of assembler dump.

That's what GDB printed out, not sure why some parts may be missing.