[Bug target/104698] Inefficient code for DI to TI sign extend on power10

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104698

--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
GCC should not use unspecs for any basic operations like this.  *That* is
the problem.