@code{VA_ARG_EXPR}. The first two parameters correspond to the
arguments to @code{va_arg}; the latter two are as in
@code{gimplify.c:gimplify_expr}.
-
-You only need to define this hook if you previously defined
-@code{EXPAND_BUILTIN_VA_ARG}; it is pretty easy to reuse the same code
-for both. One significant difference is that
-@code{EXPAND_BUILTIN_VA_ARG} returns an address, whereas this hook
-produces an expression of type @var{type}, usually an @code{INDIRECT_REF}.
-
-Once you define this macro, you can change
-@code{EXPAND_BUILTIN_VA_ARG} to just abort, as it should never be
-called.
@end deftypefn
@node Scalar Return
they have no equivalent in the source language (for example, SIMD vector
instructions or prefetch instructions).
-To create a built-in function, call the function @code{builtin_function}
+To create a built-in function, call the function
+@code{lang_hooks.builtin_function}
which is defined by the language front end. You can use any type nodes set
up by @code{build_common_tree_nodes} and @code{build_common_tree_nodes_2};
only language front ends that use those two functions will call
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