[Bug target/120870] [16/17 regression] CPython miscompiled with preserve_none and CFLAGS="-O2 -march=znver2 -ggdb3"

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120870

--- Comment #31 from Sam James <sjames at gcc dot gnu.org> ---
The good version (without -march=znver2) indeed has sp manipulation preserved.
I'll file it as a CPython bug and let them look at it, I don't know what
specifically they rely on or how much is flexible.