Use the model-defined 2051-token dense boundary, handle padded selections, and synchronize reused reduction storage in Metal, CUDA and ROCm, including vision normalization.
Enable bounded ROCm selected-attention GEMM for GLM 5.3 without RoPE. Add independent attention references, boundary tests and finite, repeatable vision checks. Focused Strix continued prefill improves from about 21 to 68 tokens per second; stored official scores are unchanged.
Salvatore Sanfilippo