[Bug target/89557] [7/8/9/10 regression] 4*movq to 2*movaps IPC performance regression on znver1 with -Og

[0xe2.0x9a.0x9b at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89557

--- Comment #11 from Jan Ziak (http://atom-symbol.net) <0xe2.0x9a.0x9b at gmail dot com> ---
(In reply to Eric Gallager from comment #10)
> 
> /usr/bin/time ./a0-7.4 |& egrep -o [0-9]+.*user
> 1.48 real         1.26 user
> /usr/bin/time ./ag-7.4 |& egrep -o [0-9]+.*user
> 0.61 real         0.59 user
> /usr/bin/time ./a1-7.4 |& egrep -o [0-9]+.*user
> 0.57 real         0.55 user
> 
> /usr/bin/time ./a0-8.3 |& egrep -o [0-9]+.*user
> 1.27 real         1.21 user
> /usr/bin/time ./ag-8.3 |& egrep -o [0-9]+.*user
> 0.60 real         0.59 user
> /usr/bin/time ./a1-8.3 |& egrep -o [0-9]+.*user
> 0.60 real         0.59 user
> /usr/bin/time ./a3-8.3 |& egrep -o [0-9]+.*user
> 0.45 real         0.43 user
> 
> /usr/bin/time ./ag-7.4n |& egrep -o [0-9]+.*user
> 0.60 real         0.59 user
> /usr/bin/time ./ag-8.3n |& egrep -o [0-9]+.*user
> 0.61 real         0.59 user
> 
> So, uh, I'm not sure if that's a confirmation, but it's an extra data point.

Interesting. Your measurement is showing that there is no performance
regression on your machine when going from ag-7.4 to ag-8.3.

Some questions:

- What CPU was used to obtain your results?

- If you run "perf record ./ag-8.3; perf report", which instructions do you see
highlighted when you enter the disassembly of function "mul"? On Ryzen 3700X, I
see:

   3.57%  movdqu 0x70(%rsp), %xmm4
  69.25%  movups %xmm4, 0x30(%rsp)
   9.32%  jmpq 11bb

Thanks.

----

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