[Bug rtl-optimization/128545] clmul (n, -1) RTL could be improved to Clang

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128545

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And similarly if it can be also used for CLMUL_WIDEN, or in that case only if
the precision is a power of two.