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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99905] wrong code with -mgeneral-regs-only
Date: Tue, 06 Apr 2021 06:51:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99905

--- Comment #2 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Martin Li=C5=A1ka from comment #1)
> > Probably present since -mgeneral-regs-only introduction.
>=20
> Confirmed that, it's since r7-928-gce3a16ff1f59e6db.

Thank you for the bisection.
If -mgeneral-regs-only is not used, the flag can be replaced by -mno-mmx
-mno-sse:

$ x86_64-pc-linux-gnu-gcc -Os -mno-mmx -mno-sse testcase.c
$ ./a.out=20
Aborted=