Add high-performance sparse BSR GEMM for Ada (sm_89) - 1.74× vs baseline

[bGOATnote]

Performance:

• 52.1 TFLOPS on NVIDIA L4 (Ada, SM 8.9)
• 1.74× faster than CUTLASS 4.3.0 baseline (~30 TFLOPS)
• 63× faster than cuSPARSE (0.87 TFLOPS)
• 83% efficiency vs dense cuBLAS (62.5 TFLOPS)

Technical approach:

• WMMA tensor cores (16×16×16 FP16)
• 2-stage pipeline with cp.async
• Optimized tile sizes (BM=256, BN=128, BK=32)
• Zero branch divergence (100% efficiency)
• 99.22% of theoretical occupancy

Validation:

• Full Nsight Compute profiling
• 100-iteration benchmarks
• Correctness verified vs cuSPARSE

Files:

• examples/89_ada_sparse_bsr_gemm/89_ada_sparse_bsr_gemm.cu
• examples/89_ada_sparse_bsr_gemm/CMakeLists.txt
• examples/89_ada_sparse_bsr_gemm/README.md

Author: Brandon Dent, MD ([email protected]) License: BSD-3-Clause

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[bGOATnote]

Hi team — this PR is still active. I’m happy to make any modifications needed for merge. Please let me know if you'd like any specific benchmarking, correctness tests, or alignment with CUTLASS 4.3.0 conventions. This kernel has been validated on L4 (SM89) with Nsight Compute and cuSPARSE baselines. Thanks!