Help with bisecting a test suite regression in GCC

[John Scott via Gcc-help <gcc-help@xxxxxxxxxxx>]

Hi,

While working on upgrading the gcc-sh-elf Debian package from gcc 11 to
gcc 12, I think I've found a regression. I'm able to reproduce it with
an upstream bare-metal build.

I've had a hard time figuring out how to bisect it. A naive run with
git bisect start
git bisect new .
git bisect old releases/gcc-11.2.0

fails with
The merge base 250f234988b6231669a720c52101d3686d645072 is new.
The property has changed between 250f234988b6231669a720c52101d3686d645072 and [7ca388565af176bd4efd4f8db1e5e9e11e98ef45].
error: bisect run failed: 'git bisect--helper --bisect-state (null)' exited with error code -3

I'm not enough of a Git or GCC wizard to get further. Does anyone have
any advice so I can make an informative bug report?

Attachment: signature.asc
Description: This is a digitally signed message part