[Bug target/117930] Improve rotates by C - x or C + x where C is multiple of bitsize on x86

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117930

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 59799
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59799&action=edit
gcc15-pr117930.patch

Untested implementation.