LRB and 32-bit compressed oops

[Roman Kennke]

Interesting. Need to see what is different there because expansion code should be almost the same as far as I know...

Roman


Am 26. März 2019 10:10:44 MEZ schrieb Aleksey Shipilev <shade at redhat.com>:
>On 3/26/19 9:14 AM, Roman Kennke wrote:
>> And BTW, does that phenomenon also show with current WB?
>
>I think WB does it right:
>
>               [Verified Entry Point]
>  9.15%         0x00007f5a24490bd0: mov    %eax,-0x14000(%rsp)
>  3.41%         0x00007f5a24490bd7: push   %rbp
>  2.82%         0x00007f5a24490bd8: sub    $0x10,%rsp
>  6.48%         0x00007f5a24490bdc: mov    -0x8(%rsi),%r10
>  2.58%         0x00007f5a24490be0: mov    0xc(%r10),%r11d
>3.28%         0x00007f5a24490be4: testb  $0x1,0x20(%r15)      <--- WB
>fastpath check
>  6.33%  ╭      0x00007f5a24490be9: jne    0x00007f5a24490bff
>0.99%  │      0x00007f5a24490beb: movl   $0x2a,0xc(%r11)      <---
>32-bit coops access
> 11.81%  │      0x00007f5a24490bf3: add    $0x10,%rsp
>  2.39%  │      0x00007f5a24490bf7: pop    %rbp
>  2.65%  │      0x00007f5a24490bf8: test   %eax,0x17c35402(%rip)
>  1.06%  │      0x00007f5a24490bfe: retq
>
>-Aleksey

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