CGH0S7 4472d89a9f Optimize bssn_rhs calculation with cache blocking and vectorization ...

- Implemented cache blocking (BLK=8) in bssn_rhs_opt.f90 to improve L1/L2 cache hit rate.
- Introduced bssn_rhs_opt.f90 module with vectorized derivative and physics kernels.
- Renamed original implementation to bssn_rhs_legacy.f90 for fallback.
- Updated bssn_rhs.f90 to act as a dispatcher, using the optimized path for ghost_width=3.
- Updated makefile to include new source files.
- Added DEBUG_NAN_CHECK macro to optionally disable NaN checks in production.

2026-01-19 16:39:24 +08:00

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