"""Fixed-size weight-stationary systolic array emulator (TPU MXU design).
42 % 13 = 3A few things to notice:
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The simulator likely overcounts standard attention though. A fused XLA kernel could, in principle, recognize the causal mask and skip the upper triangle entirely — never compute exp(-inf), never multiply by zero weights. The simulator charges full price for the masked entries; a smart compiler probably wouldn’t. (Without profiling the actual XLA-generated code, this is speculation — but the benchmark gap is consistent with it.)