nir/opt_intrinsic: Optimize bcsel(b, shuffle(x, i), shuffle(x, j))
The shuffles provided by the SPV_INTEL_subgroups extension generate
bcsel(b, shuffle(x, i), shuffle(y, j))
In the case where x and y are the same, we can turn this into a shuffle
with the bcsel on the index which lets us drop a whole shuffle.
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7366>
1 file changed
