CGH0S7 f16469ea77 Simplify Z4C Shell GPU: CPU-side trKd+TZ_rhs wrapper ...

Replace the duplicated z4c_gpu_rhs_ss.cu with a lightweight
gpu_rhs_z4c_ss wrapper inside bssn_gpu_rhs_ss.cu (guarded by
#if ABEtype==2). The wrapper:
1. Builds trKd = trK + 2*TZ on host and passes it to gpu_rhs_ss
2. After BSSN GPU returns, computes TZ_rhs = alpn1*Hcon/2 and
   applies kappa1/kappa2 constraint damping on CPU

This avoids duplicate kernel definitions (linker errors) and
keeps all shell GPU code in a single file. The CPU-side Z4C
corrections are O(100K) operations — negligible vs GPU RHS time.

Also remove the separate z4c_gpu_rhs_ss.cu and its build rule.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-10 16:05:56 +08:00

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