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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112789] Missing clang __builtin_ctzs for short
Date: Fri, 01 Dec 2023 07:07:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112789

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> So just for future reference __builtin_c[lt]zs is for short.
>=20
> But with GCC 14 (trunk) added __builtin_ct[lt]g, there is no need to add
> __builtin_c[lt]zs to GCC.
>=20
> You could just do:
>=20
> #if __has_builtin(__builtin_ctzg) && !__has_builtin(__builtin_ctzs)
> #define ctzs(a) __builtin_ctzg((short)a)
> #elif __has_builtin(__builtin_ctzs)
> #define ctzs(a) __builtin_ctzs((short)a)
> #else
> #error implement fall back for not both cases
> #endif

s/short/unsigned short/ above (and not really needed for the clang
__builtin_ctzs).
So
#if __has_builtin(__builtin_ctzs)
#define ctzs(a) __builtin_ctzs(a)
#elif __has_builtin(__builtin_ctzg)
#define ctzs(a) __builtin_ctzg((unsigned short)(a))
#else
...
#endif=