[Bug target/78102] [5/6/7 regression] GCC refuses to generate PCMPEQQ instruction for SSE4.1

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78102

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
A separate optab for equality compares would maybe work (if the difference
between 4.1 and 4.2 is really equality vs. relational compares).
vcond_eq (handling both signed/unsigned obviously).