[Bug rtl-optimization/93184] Incorrect result of right shift bit operation if compile-time constant shift amount exceeds type width

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93184

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Wojciech Migda from comment #2)
> Should there be at least a warning in case when the shift amount is a
> compile-time known constant?

There is a warning, but only when it is a constant in the FEs, in your testcase
it needs to be inlined first to turn it into a compile time constant.
For that case, the only thing the compiler offers is the runtime
instrumentation (compile/link with -fsanitize=undefined (etc.), you'll get
runtime errors about it.