https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109447
--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
Hmmm, libffi commit 464b4b66e3cf3b5489e730c1466ee1bf825560e0 seems to be
missing from GCC's sources. I'll try applying that and see if it fixes the
problem.
commit 464b4b66e3cf3b5489e730c1466ee1bf825560e0
Author: Dan Horák <d...@danny.cz>
AuthorDate: Mon Jan 31 14:08:09 2022 +0100
Commit: GitHub <nore...@github.com>
CommitDate: Mon Jan 31 08:08:09 2022 -0500
powerpc64: fix handling of homogeneous float128 structs (#689)
If there is a homogeneous struct with float128 members, they should be
copied to vector register save area. The current code incorrectly copies
only the value of the first member, not increasing the pointer with each
iteration. Fix this.
Given the output Bill is seeing and the description of the git log entry, it
seems like this may be the culprit.
