[Bug target/111332] Using GCC7.3.0 and GCC10.3.0 to compile the same test case, assembler file instructions are different and performance fallback is obvious.

[d_vampile at 163 dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111332

--- Comment #9 from d_vampile <d_vampile at 163 dot com> ---
(In reply to Andrew Pinski from comment #8)
> (In reply to d_vampile from comment #7)
> > In terms of runtime, this code is the best.
> 
> Depends on the core ....
> What does -mtune=native provide for the core which you are running on?
> Also what core are you testing with?

I also tried GCC11 and GCC12, using the same compilation options, but not even
the instruction ' vextracti128 ', so the program runs longer and performs
worse.

the assembly instruction is not change by use -mtune=native，and the test
results were still worse than gcc7.

CPU info:
Intel(R) Xeon(R) Gold 6348 CPU @ 2.60GHz
-mtune=generic