[Bug target/126973] Worse X86 codegen for arbitrary __builtin_clzg/__builtin_ctzg compared to clang.

"pinskia at gcc dot gnu.org via Gcc-bugs" <[email protected]>
Newsgroups gmane.comp.gcc.bugs
Message-ID <[email protected]/bugzilla/> 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126973

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
I am 99% the problem is clang does not implement the ABI correctly.

ctzg_uN is correct for GCC while for clang, there is an assumption that
unsigned short/unsigned _BitInt(16) is zero extended which is not a valid
assumption.
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