UseSuperWord - turned off, still emitting vector instructions?!

[David Holmes]

Hi Martin,

This is not an appropriate topic for the discuss list. Please use the 
appropriate hotspot mailing list for technical queries like this.

Thanks,
David

On 17/08/2023 11:00 pm, Martin Stypinski wrote:
> I am benchmarking some algorithms, wondering how much the JIT applies 
> auto-vectorization. I set up a JMH project and am trying to turn 
> auto-vectorization off.
> 
> 
> The code snipped, and the results can be found in the following gist: 
> https://gist.github.com/Styp/16e8a20fedfb771107377407fc1cf210 
> <https://gist.github.com/Styp/16e8a20fedfb771107377407fc1cf210> (Sorry 
> too long to post here).
> 
> 
> The results indicate that one is faster than the other, which is 
> expected. Nevertheless, the deviation is so high that the benchmark is 
> not representative. What irritates me the most is that the version with 
> turned of SuperWord still contains vadd and vmove instructions in the 
> Jit-generated code. Do I miss something? How can I enforce vectorization 
> turned off for good?
> 
> Any ideas?
>