[Bug fortran/52473] CSHIFT slow - inline it?

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52473

Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jvdelisle at gcc dot gnu.org

--- Comment #7 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Thomas Koenig from comment #6)
> Created attachment 41508 [details]
> What an unrolled cshift could look like
> 
> This is what an unrolled version of cshift could look like,
> for a simple one-dimensional case.
> 
> If the shifts are constants, all the if statements are
> optimized away at compile-time, so it is quite efficient.

How often or how important is this feature? Would it improve any known
benchmark or real world application in a significant manner?