Allow the compiler to assume that the shader always has full subgroups,
meaning that the initial EXEC mask is -1 in all waves (all lanes enabled).
This assumption is incorrect for ray tracing and internal (meta) shaders
because they can use unaligned dispatch.
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20670>
Timur Kristóf
39448c8e9c