[Bug target/89112] Incorrect code generated by rs6000 memcmp expansion

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89112

--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The patch in #c5 is pre-approved everywhere.  Thanks!

#c4...  Do you *want* to keep it together?  Is it in fact cold?  If it is not,
maybe you can improve the execution estimate for it?