Alfie Richards <alfie.richa...@arm.com> writes:
> Notably this respects target_version semantics where an unannotated
> function can be the default version.
>
> gcc/ChangeLog:
>
> * attribs.cc (is_function_default_version): Add target_version logic.
OK for GCC 16, thanks.
Richard
> ---
> gcc/attribs.cc | 27 ++++++++++++++++++++-------
> 1 file changed, 20 insertions(+), 7 deletions(-)
>
> diff --git a/gcc/attribs.cc b/gcc/attribs.cc
> index 56dd18c2fa8..f6667839c01 100644
> --- a/gcc/attribs.cc
> +++ b/gcc/attribs.cc
> @@ -1279,18 +1279,31 @@ make_dispatcher_decl (const tree decl)
> return func_decl;
> }
>
> -/* Returns true if DECL is multi-versioned using the target attribute, and
> this
> - is the default version. This function can only be used for targets that
> do
> - not support the "target_version" attribute. */
> +/* Returns true if DECL a multiversioned default.
> + With the target attribute semantics, returns true if the function is
> marked
> + as default with the target version.
> + With the target_version attribute semantics, returns true if the function
> + is either not annotated, or annotated as default. */
>
> bool
> is_function_default_version (const tree decl)
> {
> - if (TREE_CODE (decl) != FUNCTION_DECL
> - || !DECL_FUNCTION_VERSIONED (decl))
> + tree attr;
> + if (TREE_CODE (decl) != FUNCTION_DECL)
> return false;
> - tree attr = lookup_attribute ("target", DECL_ATTRIBUTES (decl));
> - gcc_assert (attr);
> + if (TARGET_HAS_FMV_TARGET_ATTRIBUTE)
> + {
> + if (!DECL_FUNCTION_VERSIONED (decl))
> + return false;
> + attr = lookup_attribute ("target", DECL_ATTRIBUTES (decl));
> + gcc_assert (attr);
> + }
> + else
> + {
> + attr = lookup_attribute ("target_version", DECL_ATTRIBUTES (decl));
> + if (!attr)
> + return true;
> + }
> attr = TREE_VALUE (TREE_VALUE (attr));
> return (TREE_CODE (attr) == STRING_CST
> && strcmp (TREE_STRING_POINTER (attr), "default") == 0);
