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From: "d_vampile at 163 dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110059] When SPEC is used to test the GCC (10.3.1), the
 test result of subitem 548 fluctuates abnormally.
Date: Wed, 31 May 2023 12:14:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110059

d_vampile <d_vampile at 163 dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|10.3.1                      |10.3.0
             Target|                            |aarch64
                URL|                            |https://gcc.gnu.org/piperma
                   |                            |il/gcc-patches/2019-Septemb
                   |                            |er/530304.html

--- Comment #1 from d_vampile <d_vampile at 163 dot com> ---
When the SPEC is used to test the GCC (10.3.0) performance, the test result=
 of
subitem 548 fluctuates abnormally.=20
Trace the cause of the exception. I analyze that the commit(r276140) is fau=
lty.
Revert this commit(r276140), and the fluctuation of spec 548 test results f=
or
gcc 10.3.0 is significantly reduced. The following is the test result.

GCC 10.3.0 test result:

Benchmarks          copies   runtime   ratio
548.exchange2_r     128        553        607=20=20
548.exchange2_r     128        512        654=20
548.exchange2_r     128        513        654=20=20
548.exchange2_r     128        553        607=20=20
548.exchange2_r     128        553        607=20=20
548.exchange2_r     128        514        652=20=20
548.exchange2_r     128        515        652=20=20
548.exchange2_r     128        553        607=20=20
548.exchange2_r     128        553        607=20=20
548.exchange2_r     128        508        660=20=20

Test result after revert this commit:

Benchmarks          copies   runtime   ratio
548.exchange2_r     128        520        645=20=20
548.exchange2_r     128        680        494=20=20
548.exchange2_r     128        527        637=20=20
548.exchange2_r     128        679        494=20=20
548.exchange2_r     128        524        640=20=20
548.exchange2_r     128        679        494=20=20
548.exchange2_r     128        524        640=20=20
548.exchange2_r     128        524        640=20=20
548.exchange2_r     128        520        645=20=20
548.exchange2_r     128        521        644=