================
@@ -3504,6 +3504,47 @@ argument can be of any unsigned integer type.
``__builtin_popcount{,l,ll}`` builtins, with support for other integer types,
such as ``unsigned __int128`` and C23 ``unsigned _BitInt(N)``.
+``__builtin_clzg`` and ``__builtin_ctzg``
+-----------------------------------------
+
+``__builtin_clzg`` (respectively ``__builtin_ctzg``) returns the number of
+leading (respectively trailing) 0 bits in the first argument. The first
argument
+can be of any unsigned integer type.
+
+If the first argument is 0 and an optional second argument of ``int`` type is
+provided, then the second argument is returned. If the first argument is 0, but
+only one argument is provided, then the returned value is undefined.
----------------
efriedma-quic wrote:
Probably should say "the behavior is undefined", to match the C standard
wording for this sort of thing. (The IR intrinsic returns poison, but "poison"
isn't a C language concept.)
https://github.com/llvm/llvm-project/pull/83431
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