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From: "bugreporter66 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109004] [10/11/12/13 Regression] wrong code for -O2 (any
 above -O0) with g++ 11.3 for POWER9 (cross-compiler on x86_64 host)
Date: Thu, 16 Mar 2023 12:48:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109004

--- Comment #10 from bugreporter66 at gmail dot com ---
I checked the simple version of the test with QEMU 6.2.0 and 7.0.0:

ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$ powerpc64le-linux-gnu-g++ -O2
-mcpu=3Dpower9 -ffast-math -static sample.cpp -o sample_p64
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$ qemu-ppc64le --version
qemu-ppc64le version 6.2.0
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$ qemu-ppc64le -cpu POWER9
sample_p64=20
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted (core dumped)
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20

...

ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$ qemu-ppc64le --version
qemu-ppc64le version 7.0.0
Copyright (c) 2003-2022 Fabrice Bellard and the QEMU Project developers
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$ qemu-ppc64le -cpu POWER9
sample_p64=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20
ubuntu-mate@ubuntu-mate:~/Downloads/test_p64$=20

So it works after 7.0.0=