Improve performance of tracer ∂ᶜρχₚ_err_∂ᶜρχₚ update #4064
Description
The Climate Modeling Alliance
Software Design Issue 📜
Purpose
For these lines:
This update is quite slow (likely because high register pressure).
For a simulation using the longrun_aquaplanet_allsky_1M config, that kernel accounts for
~11% of the total simulation time (excluding diagnostics), and uses 68 registers per thread.
Cost/Benefits/Risks
Theoretical speedup of ~3%
Closing this issue should improve the performance of this update significantly.