[Bug target/123839] riscv: Optimize constant permute to slidedown + slideup.

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123839

Jeffrey A. Law <law at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|120763                      |

--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
I know Raphael is waiting for upstream development to reopen and he'll
officially submit the patch at that point.  In the mean time I've added it to
my tester and put it on a branch devel/jlaw/pr123839 in case anyone wants to
play with it.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120763
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