[Bug target/82897] Unnecessary zero-extension when loading mask register from memory

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82897

--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> Because builtins are treated like any other function calls, and if
> short/char args are promoted for normal calls, they are promoted for
> builtins too.

Indeed. Disabling TARGET_PROMOTE_PROTOTYPES gets us the direct move from
memory.

So... do we really need to promote all these builtins that usually result in a
well known instruction? Is there a way to mark (some of ?) them with a
"nopromote" flag?