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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/105275] 525.x264_r and 538.imagick_r regressed  on
 x86_64 at -O2 with PGO after r12-7319-g90d693bdc9d718
Date: Wed, 24 Jan 2024 22:41:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105275

--- Comment #3 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I have re-checked this year again (using master revision
r14-7200-g95440171d0e615)  but this time on a high-frequency Zen3 CPU (EPYC
75F3). Run-time of 525.x264_r built with master with PGO and -O2 improved by
5.49% compared to GCC 13 and so compared to GCC 11 the regression dropped to
4.2%.

Run-time of 538.imagick_r compiled with the same options and master is 5.8%
slower on this CPU than when compiling it with GCC 11.

With both PGO and LTO, 525.x264_r is now only 2.8% slower than GCC 11.  In =
case
of 538.imagick_r the regression is 2.01% on the zen4, but it is 7.49% on a =
zen4
machine :-/=