Enable intrinsics and skip MatMul2D densify for dense inputs #3
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Perf (Benchmark20_1_simd_intrinsics, IterationCount=200, WarmupCount=1, InProcess): - net10 mean: 67.31 ms - net10-perf mean: 40.20 ms (~1.67x faster, -27.11 ms) Env: Intel Xeon W-2223, .NET 10.0.1, AVX-512F+CD+BW+DQ+VL. Output check: last_hidden_state payload matches between net10 and net10-perf for 'Hello world this is some text' (timestamp stripped, --disable-simd). Not included (regressions/unstable): packed B^T cache kernel, odd-M 2x4 tail, MatMul broadcast fast path, linear batch offsets, 4x4 kernel, AVX load/store, C-span reuse, AggressiveOptimization attribute, Broadcast alloc avoidance, shape-dedupe pass.
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Perf (Benchmark20_1_simd_intrinsics, IterationCount=200, WarmupCount=1, InProcess):
Env: Intel Xeon W-2223, .NET 10.0.1, AVX-512F+CD+BW+DQ+VL.
Output check: last_hidden_state payload matches between net10 and net10-perf for 'Hello world this is some text' (timestamp stripped, --disable-simd).