About

It is desirable to have a common syntax across LLVM and GCC to allow developers to specify target code generation options via an attribute on a per-function basis. So for example this would allow a developer to specify that a particular function should be compiled with the `V' extension. This support is also a prerequisite for supporting function multiversioning. Given the dependencies on this feature it's considered high priority to get it landed in GCC 14 and LLVM 18.

Stakeholders/Partners

RISE:

SiFive: Kito Cheng (specification and GCC implementation).

SiFive: Piyou Chen (LLVM implementation)

Dependencies

Status

Development	complete
Development Timeline	2H2023
Upstreaming	COMPLETE
Upstream Version
Contacts	Kito Cheng (SiFive) Piyou Chen (SiFive)
Dependencies

Updates

Jul 11, 2024

Marking complete. A separate project has been created for function_multiversioning.

Apr 12, 2024

Moved to 1H24 as work is still in progress.
attribute(target) is supported in LLVM 18.
target_clones support is in progess https://github.com/llvm/llvm-project/pull/85786

Oct 10, 2023

Project reported as priority for 2H23