SIMD Intrinsics Purpose Guide agents through SIMD: reading auto-vectorization output, writing SSE2/AVX2/NEON intrinsics, runtime CPU feature detection, and choosing between compiler auto-vectorization and manual intrinsics. Triggers - "How do I check if my loop is being auto-vectorized?" - "How do I write SSE2/AVX2 intrinsics?" - "Auto-vectorization failed — how do I fix it?" - "How do I check for CPU features at runtime?" - "Should I use intrinsics or let the compiler vectorize?" - "How do I write NEON intrinsics for ARM?" Workflow 1. Check auto-vectorization Common auto-vectorization blocke…