[Bug middle-end/77718] [7 Regression] expand_builtin_memcmp swaps args

[acsawdey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77718

--- Comment #6 from acsawdey at gcc dot gnu.org ---
I can confirm that Bernd's patch fixes the issue, bootstraps on powerpc64le,
and does not cause any new regression test failures in "make check".