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

[egallager at gcc dot gnu.org]

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

--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jan Ziak (http://atom-symbol.net) from comment #9)
> (In reply to Richard Biener from comment #5)
> > Please provide a compilable testcase.
> 
> Done some time ago. Please change the status of this bug from WAITING to
> some other status.

I had to modify the Makefile a bit (i.e. rename compiler executables, tweak
flags, specify shell) to get it to work on my system, and once I did, this is
the output I got:

$ /opt/local/libexec/gnubin/make
rm -f a?-?.?
g++-mp-7 -O0 -g -Wall -Werror -Wswitch-enum  -o a0-7.4 a.cc
/var/folders/2V/2VxMt4WCF5avqTEcHvhx9k+++TI/-Tmp-//ccD198h7.s:3:11: warning:
section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2V/2VxMt4WCF5avqTEcHvhx9k+++TI/-Tmp-//ccD198h7.s:3:11: note:
change section name to "__text"
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
g++-mp-7 -Og -g -Wall -Werror -Wswitch-enum  -o ag-7.4 a.cc
g++-mp-7 -O1 -g -Wall -Werror -Wswitch-enum  -o a1-7.4 a.cc
g++-mp-8 -O0 -g -Wall -Werror -Wswitch-enum  -o a0-8.3 a.cc
/var/folders/2V/2VxMt4WCF5avqTEcHvhx9k+++TI/-Tmp-//ccnY2JQT.s:3:11: warning:
section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2V/2VxMt4WCF5avqTEcHvhx9k+++TI/-Tmp-//ccnY2JQT.s:3:11: note:
change section name to "__text"
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
g++-mp-8 -Og -g -Wall -Werror -Wswitch-enum  -o ag-8.3 a.cc
g++-mp-8 -O1 -g -Wall -Werror -Wswitch-enum  -o a1-8.3 a.cc
g++-mp-8 -O3 -g -Wall -Werror -Wswitch-enum  -o a3-8.3 a.cc
g++-mp-7 -Og -g -Wall -Werror -Wswitch-enum  -march=native -o ag-7.4n a.cc
g++-mp-8 -Og -g -Wall -Werror -Wswitch-enum  -march=native -o ag-8.3n a.cc

/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.