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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/107905] 2x slowdown versus CLANG and ICL
Date: Wed, 30 Nov 2022 13:57:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107905

--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Not sure what you don't like about the inputs, they appear quite reasonable.
Perhaps GCC's estimation of bb frequencies is off (with profile feedback we
achieve good performance).

Georgi: you'll likely see better results with profile-guided optimization. =
You
can first compile the benchmark with -O2 -fprofile-generate, run the output=
 (it
will generate *.gcda files), then compile again with -O2 -fprofile-use. For
Clang the options are spelled -fprofile-instr-generate and -fprofile-instr-=
use,
respectively.=