gallivm: passing fp16_split_fp64 to fp16 lowering.
This causes lavapipe to use the split code and fixes accuracy for CTS.
Fixes dEQP-VK.glsl.builtin.precision_fconvert.f64_to_f16*
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
This causes lavapipe to use the split code and fixes accuracy for CTS.
Fixes dEQP-VK.glsl.builtin.precision_fconvert.f64_to_f16*